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The idea of a supercharger on a rotary is a bit silly unless you really don't ever want to experience lag. Otherwise, its a lot less efficient since you aren't harnessing the very hot exhaust gasses & very strong exhaust pulses from the ports to drive it, which means for a given amount of boost, you'll make more power with a turbo vs a supercharger.
That being said, I can understand the desire to do something "just because"... I have a few un-finished projects of that variety going. If you do want to go down this rabbithole, then at least superchargers are much easier to match to an engine than turbos, and you should be able to run a little bit more boost with an SC than a TC on your high-CR engine since you won't have nearly as much exhaust residuals since you won't have any backpressure. However, you will need to worry about both the throttle & a supercharger bypass valve to connect to the gas pedal, since if you use only a throttle, the SC becomes even less efficient at part load since you're still doing compression with it, where as a TC sort of naturally becomes thermodynamically inactive at low engine loads without hurting efficiency.
That was a fair and informative response to what is essentially a fantasy/Dear Penthouse situation.
Let's bear in mind that the head fabricator for this project has spent nearly two years on a set of wheels. Projections from this baseline performance data suggest a running, supercharged rotary engine somewhat north of 2030.
The meercreature will realize his folly as he chips free of his winter ice cocoon next spring.
As blood begins to flow and reason returns he'll see this as the pre-winter madness it is.
The idea of a supercharger on a rotary is a bit silly unless you really don't ever want to experience lag. Otherwise, its a lot less efficient since you aren't harnessing the very hot exhaust gasses & very strong exhaust pulses from the ports to drive it, which means for a given amount of boost, you'll make more power with a turbo vs a supercharger.
That being said, I can understand the desire to do something "just because"... I have a few un-finished projects of that variety going. If you do want to go down this rabbithole, then at least superchargers are much easier to match to an engine than turbos, and you should be able to run a little bit more boost with an SC than a TC on your high-CR engine since you won't have nearly as much exhaust residuals since you won't have any backpressure. However, you will need to worry about both the throttle & a supercharger bypass valve to connect to the gas pedal, since if you use only a throttle, the SC becomes even less efficient at part load since you're still doing compression with it, where as a TC sort of naturally becomes thermodynamically inactive at low engine loads without hurting efficiency.
thanks for the tips toplessfc3sman! i really have been wondering how the actual planning of this is going to go down. there is alot to think about and trawling the net has given me mixed answers. plus in comparison to turbo and N/A wankel applications, there is a lot less info out there. by arvikas recomendation, i have ordered 'supercharged' by corky bell. and while i was at it i bought another book about turboing/modding 13b's so that i can cram as much info before i ruin my economy further!
Originally Posted by clokker
That was a fair and informative response to what is essentially a fantasy/Dear Penthouse situation.
Let's bear in mind that the head fabricator for this project has spent nearly two years on a set of wheels. Projections from this baseline performance data suggest a running, supercharged rotary engine somewhat north of 2030.
The meercreature will realize his folly as he chips free of his winter ice cocoon next spring.
As blood begins to flow and reason returns he'll see this as the pre-winter madness it is.
i cant even argue with that clokks 'bout 2032 sounds about right haha. the worst thing about it is that if swedish environmental legislation continues at the same pace that it has over the last ten years, combustion engines will be banned and we'll all be flying around on lentil-powered hoverboards by then, thus rendering my project pointless..
i actually havent heard anything from robban for the past couple weeks so i should start picking on him soon.. as long as the wheels are ready by next spring/summer i have no complaints..
Originally Posted by blame
dude... no supercharger..
TURBOOOOOOOO!!!!!!!!
-sean
trust me sean i really am resisting the temptation on the grounds of price and simplicity/availability of kits. but i really fancy the idea of a SC.
if i should decide not to 'go down the rabbit hole' as toplessfc3sman so aptly put it, i would try to get a smaller ball bearing turbo. i want more power but early boost is the main focus for sure..
is that your garage man? im jealous. not having a garage is really starting to suck big hairy ***** right now
as you guys may have noticed i havent posted for a while. a buddy 'o' mine hooked me up with a job on a building site a couple weeks ago as a labourer. up at 4:45 every morning and a typical task at work entails..
"here's a couple piles of broken up concrete floor. make em disappear"
it has taken a couple weeks to get used to the extra early mornings and physical nature of the job (havent done anything like this for a good few years) but im getting into the swing of it now. saying that i havent been able to put any time or energy on the seven. all i can think about is flaking out on the sofa when i get home..
the only physical progress i have had to date is getting my racing beat gaskets yesterday.
as i mentioned before, not having a garage is beginning to suck immensely and this combined with the cold and wet weather we have been having the last couple of weeks has reduced my will to go out and change them myself on my parking to zero.
i know a dude that works at a tyre and exhaust place that can sort it out for me cheap so im going to take the lazy route and just pay for the luxury of a ramp and some power tools this time. i have a sneaking suspicion that it may be leaking from the middle muffler somewhere which if true, will mean i have to buy a new one from racing beat to the tune of 269.00 usd plus freight. yummy. but ill change the gaskets first to see if that sorts it.
the next weeks will mainly involve me trying to get together my skyline parts and putting up for sale and then crossing my fingers and hoping there is someone with a bunch of cash/lysholm twinscrew SC just waiting for someone like me to sell some gtr stuff!
Hey man, I get wanting to be unique and taking the road less traveled etc.. And there are definitely some attractive characteristics of supercharging vs turbocharging.. But man do I love turbos! There's nothing like the surge of power when it spools up. Sometimes when one way of doing things is vastly more popular and has far greater resources for both knowledge and parts availability, there may be a reason!
Yes, that's my 'garage'. It's a shop space I'm renting with a buddy of mine. There used to be three of us splitting the rent together, but one had to move away for health reasons, and the cost is pretty hefty with only two of us pitching in now so I'm not sure how much longer I'll have that wonderful space. I was just there all day actually converting my subaru from low stiff racecar mode into tall squishy monster truck mode for winter.
I'm sure whatever you end up doing with your Mazda will end up being pretty sweet. You seem to want to do things your own way, no matter how difficult or heartbreakingly tedious (ahem.. Custom widened steel wheels).
Yes, that's my 'garage'. It's a shop space I'm renting with a buddy of mine. There used to be three of us splitting the rent together, but one had to move away for health reasons, and the cost is pretty hefty with only two of us pitching in now so I'm not sure how much longer I'll have that wonderful space. I was just there all day actually converting my subaru from low stiff racecar mode into tall squishy monster truck mode for winter.
I'm sure whatever you end up doing with your Mazda will end up being pretty sweet. You seem to want to do things your own way, no matter how difficult or heartbreakingly tedious (ahem.. Custom widened steel wheels).
Looking forward to seeing what happens!
-sean
yeah man been there.. the last year and a part of this year i was paying 330 dollars us a month for my garage i was sharing. it didnt half put a dent in my wages. space is really expensive here in the city..
the subie sounds alot better than driving around i a squishy understeered p.o.s citroen berlingo for the next half year hehe (family cars..sheesh)
i took her to a garage today just to check the exhaust system and found no leaks! seems like the last time i had her up on jack stands i succeeded in eliminating them. i couldn't smell any fumes on the way back but still felt funny and had to sleep for an hour. i didn't have this problem before so i racked my brains for what i have changed with the car that lets in fumes where it didn't before and the only thing i can think of are the s5 tails. when i shortened the license plate holder so that it would fit between them, i had taken away the 'side bits' that previously sat against the tails. this left a hole on each side which could let gases into the car because of drag.. haven't been able to go out and check cause im on baby duty but will check tomorrow. i'm going to the last meet of the year tomorrow so if anything ill only have time to do a quick fix with some tape but will be able to see if it makes a difference depending on how drugged i look when i arrive lets hope i fix this before i get aggressive lung cancer..
idk man, I trimmed my s5 tails portion really professionally on my other S4 and never had any smelly issues or nausea. I would be shocked if it was something like that. Granted, you say shorten, I only "trimmed carefully with my dremel" so you may very well have caused something like that.
Try taping up the back of the tail light area, see if that helps you feel any better driving around. It could also be the rubber seal all around the rear hatch, or possibly holes in the underbody (spare tire well, fuel pump door) but if you checked all the exhaust gaskets and found no leaks then that is less likely
Good luck bud! You want to have a 'sick ride' in the good way, not the bad
my apologies for my absence.. tbh i havent really had anything to document over the last few weeks and if i had it would have looked like this. eat-sleep-work-train-parenting-repeat.
today bought some rubber matting which was recommended to me by one of my swedish wankel brethren so that i can change the rubber that keeps the tail lights more or less airtight. tomorrow im going to pull the whole lot and try to make a better job of them and the reg plate holder during the week. as i wrote before i guess my activity will be slowed during the winter but i shall try and keep you updated with what tidbits i can get done without freezing my nackers off. =)
Its been a while since i posted, me and the seven have been forced to wait the cold months out. i have started studying to be an electrician so thats been keeping me busy. My little girl is 9 months already! Time flies for sure.
This winter has been fairly mild to be honest (but still cold enough to justify me not going out there). There have been a few times where there was no snow or ice and i dutifully went out dressed like an inuit, warmed her up and drove her around for a half an hour or so. She still ran a bit like poo but she ran nonetheless. Which brings me to my problem.
about a week ago i went to start her and she wouldnt turn over but everything else seemed fine apart from a intermittent wierd clicking sound. I tried to jump her using the micra but she just wouldnt turn over and just seemed to get weaker the more i tried.
I tried to jump her again today and she was completely dead.
I even swapped the battery over from the micra and nothing. zip, doodah, diddlysquat. not even the slightest flicker from any lights or anything. This,as you may imagine concerns me. I tried looking on interweb but no happyhappyjoyjoy. Maybe i was wording my searches wrong but got no further than 'how to fix a dead battery'
any ideas on what could cause this? im thinking fusebox?
by the way i havent actually started learning learning anything about electricity yet, they are still enjoying watching me squirm as i get back up to scratch with my mathematics so im still just as useless at it. I genuinely hope that this will change in the future Seeing as im not likely to get less electrical problems as the seven nears veteran status. 😋
Let's bear in mind that the head fabricator for this project has spent nearly two years on a set of wheels. Projections from this baseline performance data suggest a running, supercharged rotary engine somewhat north of 2030.
The meercreature will realize his folly as he chips free of his winter ice cocoon next spring.
As blood begins to flow and reason returns he'll see this as the pre-winter madness it is.
well, as much as i hate to admit it, this is a pretty fair description of how i feel now hehe
i have kept it simple this winter, its consisted mainly of watching my daughter grow, studying, training and being broke.
the weathers finally at that stage where scandinavians everywhere are venturing forth from hibernation and pulling their various summer cars/bikes out. seeing a motorbike at all is generally a good sign.
so, i scraped me pennies together and bought a new battery for the seven and popped it in the other day aaaand nothing happened. it was completely dead as a doornail. lars, (my new rotary gaurdian angel) kindly came by after work and had a look at her. to my embarresment, it turned out to be nothing more complicated than that the main fuse had gone. the next problem was that i had lost my key recently and had sorted a new one from mazda. trouble was that the previous owner had installed a alarm with an immobiliser and i had no remotes left. lars pulled a fuse and she coughed to life. helping me took all of about 5 minutes
the problem with exhaust coming into the car remained so lars said i could come up to the school where he teaches mechanics where he had a 'smoke wizard' so that we could check everything properly. its a good 45 minute drive from me and i honestly nearly threw up on the way there the fumes were so bloody strong. it doesnt help that the seven is running uite rich at the mo. anyhoo to cut a short story shorter, it turned out that the exhaust was coming in at the taillights, it was just that i had taped up the wrong place. the smoke wizard proved without a doubt that my exhaust system wasnt leaking. he then checked the intake with it and he pointed out that my LIM was leaking which probably is what is affecting my idle and quite possibly why i didnt pass emissions. considering that the 7 wasnt trying to gas me to death, the journey home was a pleasant one.
she is still backfiring/sputtering/losing power when she hits 3800 so im going to change back from 550cc to 460cc injectors asap to see if that helps. considering my financial status (which is what has blown my plans for a forced induction 13b out of the water at least for the time being) im going to try and source them from a scrapyard. lars can help me to jet them so it doesnt matter if theyre a bit dirty.
AND NOW FOR AN UPDATE ON MY WHEELS!!!
no. theyre still not finished. didnt expect that didger?
Enjoy your six day summer while it lasts and I'll gloat later.
you speak the truth sir. even though it was sunny today it was still proper chilly. its may and it hasnt even warmed up yet. ive pretty much given up on the climate over here smh..
my start motor died at the petrol station today. coincidentally, a fellow i met the other day who lives very close to me that has a nice s4 turbo happened to turn up just then and gave me a hand to push start her. it was surprisingly easy to get her turning over even though she was still technically cold (the petrol station is within walking distance of my apartment) which seems positive. i also got to have a ride in his s4 which is fairly trimmed. it was bloody brutal. my car will never feel fast again haha ill definately go for a turbo build later when money (and life in general) allows.
despite many layers of (admittedly bad quality) duct tape, exhaust is still getting in. not as much as before, but still enough to make my clothes postively reek when i get home so that i can be scolded by my other half for my negligence towards my health and general safety. gonna make a proper effort to seal everything up next week i have been given a couple of ideas
looks like ill be off to "lightning service" again next week to get the start motor renovated then..
as much as it sucks to say it, unfortunately not. robban called me last week and basicly said that he was just tired and dissapointed with his welder. he has been calling and calling (i dont even know how long the dude has had them. way longer than is exscusable anyway ) and after all this time the guy turns around and said he doesnt have the time. yet again i have my stuff held hostage by someone who is too greedy to say no to jobs even though he knows that he doesnt have time and obviously doesnt care about wasting mine. most infuriating.
robban has been good as gold though. everything he has had to do has gone relatively quickly and despite injuries and new additions to his family, he has still made time to sort out my wheels. anyway he said "screw it. ill do it" so im going to go up to him over the next week or so and we are going to sort them out together.
i havent been idle i just havent really felt inspired to do any updates because im kinda stuck in this sort of crappy troubleshooting limbo with the engine. to be honest im at the stage now where i can see the light at the end of the tunnel but it still feels like ive along way to go until she runs proper.
lars has been helping me when he can and has really been a saviour. not only through sharing his knowledge and experience but also keeping my interest alive. we have been to a couple of fun car meets together and its definately been a good kick up the bum to keep going.
i have gotten a few bits done actually. first i bodged up some seals for the bottom part of the taillights that were missing. im starting to suspect that they never came with them in the first place. i bought some 2mm thick rubber matting from good old cheap and cheerful biltema (i love that place more and more everyday) and with some scissors, a carpet knife and some epoxy glue managed to fashion something resembling a seal. sorry for the poor picture quality, my phone camera is a complete p.o.s but its just as well because this is most certainly not the prettiest job i have done.
i had to double them up to 4mm hence the glue and the fact that it looks like dooky. nevertheless, i reckon it worked! im 99.99999% sure that there arent any fumes coming into the coupe anymore. it was a bit difficult to be sure because during the time that it has been getting in the stench had thoroughly saturated the carpet and leather so i basicly couldnt tell. i still had to tape up the lights on the inside but its not visible so it can just be our secret eh?
i couldnt be bothered to order the LIM gasket from atkins so i just ordered from mazda. well, belgium. once i received it i stopped complaining about the price straight away. proper robust stuff. i also got my start motor renovated. bit pricey but i got a new drive and solenoid. and it looked very pretty too. afterall, who doesnt like shiny things?
i got lucky and the weather was proper nice one day so i popped everything in. geuss im a proper shade tree mechanic now. fixing my car under the shade of a tree with my jack with a crowbar for a lever and the car propped up on some granite slabs i found hehe . although it needed to be done, the new gasket was no magic cure for the way she was running (plus she started mysteriously flooding again. maybe i missed something) anyway lars kindly said i could come up to the school to check my emissions.
and they were high. VERY high. note that my co was hovering around 9.5 before lars had had a go at it. ill not be getting through a safety inspection any time soon..
lars had a good old fiddle around and checked the timing and tps and everything seemed in order. only thing that was wierd was the the turn screw on the intake doesnt seem to have any effect on the idle. fully open or closed, with or without the set check connector shorted, doesnt seem to make a blind bit of difference. most strange..
anyway he made quite an important discovery and that was that i had the leading and trailing coils the round way wrong. that was a big miss on my part. anyway swapping them around worsened the idle and there was a noticeable increase in power. im not sure what that means but its definately progress. he also noticed one of the coils leaking oil so they gots to go. fortunately i sold the wheels and tyres to my skyline yesterday so i finally have a bit of moolah to play with!
ill be lavishing some of that glorious legal tender on a pair of brand spankers msd blaster 2 coils towards the weekend, and i geuss ill continue from there
i know this doesnt make up for still not having any wheels but its a start..
10-12-14, 09:25 PM
'bout 2032 sounds about right haha. the worst thing about it is that if swedish environmental legislation continues at the same pace that it has over the last ten years, combustion engines will be banned and we'll all be flying around on lentil-powered hoverboards by then, thus rendering my project pointless..
(family cars..sheesh)
