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Ice Racer/Rally Rx7 build

Old 10-02-18, 11:19 PM
  #276  
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Ever dyno it with the Mikuni? What intake did you use for your new build?

Thanks! Looks cool!
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Old 10-05-18, 12:08 PM
  #277  
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Originally Posted by Jager View Post
Ever dyno it with the Mikuni? What intake did you use for your new build?

Thanks! Looks cool!
I did, its a few pages (and years) back but it did about 132whp and 125tq at 6800 RPM but managed to runs 14s with it in the 1/4 mile which wasn't so bad but that was the old engine, I never dynoed this engine with the mikuni.

I'm just using a stock s5 NA intake right now with the VDI wired open.
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Old 10-05-18, 02:38 PM
  #278  
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Countdown to LSPR 2018 is in full swing!

New MRF tires softcompound on some freshly coated wheels (got to make it pretty for all the nice colors up there)



3 lefts and 3 rights, 1 pair will be cut, potentially 2 pairs depending how the event goes.



Belts and seats at the correct length and installed?



CHECK!

skid plates ready to go and the full underbody protection is in place?





Check and check!



Also a good helping hand is a trans jack when you got these awkward sheets of plastic hanging around and need to bolt it in quickly:





Have a beer and not bolt anything down because you wanna see how the dashboard looks in the freshened up interior and you're too tired to go because there is work in the morning...

yeah we can do that too!





now today is finish up the dash and get everything electrically hooked up and test drive tonite in preparations for the rallycross tomorrow that will likely be canceled due to rain since the site is in a dirt cricle track and becomes pretty much useless over a .5" of rain...
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Old 10-06-18, 07:31 AM
  #279  
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Originally Posted by fidelity101 View Post
I did, its a few pages (and years) back but it did about 132whp and 125tq at 6800 RPM but managed to runs 14s with it in the 1/4 mile which wasn't so bad but that was the old engine, I never dynoed this engine with the mikuni.

I'm just using a stock s5 NA intake right now with the VDI wired open.
Awesome. I was just a little curious!

I have a hard time "going back" with this infinite scroll feature this forum has. Blows my mind.
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Old 10-07-18, 03:43 PM
  #280  
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I would guestimate it at around 150whp it definitely felt faster between the two engines but really the carb was too small and there was no needle/seat that was big enough to fill the tiny fuel bowl for the fuel I needed above 6500
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Old 10-25-18, 03:00 PM
  #281  
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LSPR 2018 is over and we made it through alive and the car intact!





Had we not got so many penalties due to co-driver errors (seriously not causing blame on this he owned up to it lol) we would have podium'd both days of the rally! We were working on the car the day before the drive up to the rally and had some minor issues to fix for tech (lights/stickers/etc) and got an alignment only a few days prior to the start of the rally.


The front is lowered, the rear is lifted and I have .1* positive camber in the back but that didn't stop us from sending it!







Day 1 was dry and fast/smooth roads - we had some long stages 10-13miles long with some medium 6-8 mile long stages thrown in. Weather was great and we were doing pretty okay figuring out what limits of the car we can take and what lines not to take. We have basically DNF'd every rally we have entered in some shape or form so we wanted to be cautious and check that everything was working like it should, and it did!



Day 2 was a whole new animal, we went from 36th on the road to 20th which was great because we took 3rd the 1st stage, then 1st on the second stage and then 3rd overall on the 3rd stage (missed first by several seconds and 2nd by about 1 second).




We were actually leading the regionally rally overall going into service. Stage#10 we saw a lot of cars off, got caught in a few slippery moments where I had a few brief moments panic (of getting stuck) and other areas were grippier than expected. Our road placement was key as the other cars helped sweep away some of the snow from the other road or we would have started the day with snows instead of gravels but we gambled on tires and it worked! I always liked racing in the slop at rallycross so this was right at home to get the car sideways and rotate how I wanted. Post stage we can't help but think how awesome Yokohama A034's are for LSPR and how we wished we would have had them but the MRF softs were pretty predictable and were brand new so every little bit helped, You can tell in a lot of areas in the video where I was not on the gas and a general lack of grip. I did improve the time on when we re-ran the stage in the afternoon and I took 10th overall on it during that time.






here are a few more of our favorite shots seriously considering a championship regional run next year, before year end the front shocks are getting updated and the car will sit more level and a scary moment almost hitting a rolled car, they were okay luckily otherwise we would have stopped. They had told us later that the triangles were pinned in the carb between the door and they could not get to them.


























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Old 02-13-19, 11:16 AM
  #282  
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Rally-America does this for the overall stage winners: was happy to see this!



Some updates I “made” to frankenburban but in reality: it was just being better organized. I wanted to improve the service tool situation as the first sno*drift was a cluster F and it turned out work great during LSPR .



We even managed to do Recce (both times) with the toolbox in the trunk, its more organized than my boxes at home! But it rattles around too much when empty and basically takes up the whole back of the truck which can be inconvenient…


Some more truck updates to come before Southern Ohio Forrest Rally (SOFR – May 18th) like onboard air and general suspension maintenance that has been postponed

I know it was a few months in between the two events and I mostly didn't waste the free time (mostly) as I did make up a pretty good “TO DO” list:



So I definitely had my work cut out of for me…

I had noticed some play in my steering hub adapter, even so lightly as if it seemed to have play in the splines as you rotate it you could feel it but its hard to tell when you’re bouncing around a stage road at speed so I made it a point to replace this. Imagine my surprise when I saw this!



Replaced it with an NRG hub adapter (billet) and after watching the Ken Block video where the cozzie burns to the ground abruptly out on stage after a brief roll I went with a works bell quick release hub, AWESOME product.

So meanwhile I know I have to do the shocks and one of the tie rod ends was starting to wear so I decided to freshen up the steering system as it will need an alignment anyways and now I have spare tire rod ends if I need to finish a rally – spares are good but hopefully never needed…

But that’s not all for the suspension – I saved the best for last. Bilstein 46mm universal motorsport shocks – custom adapted for the rx7 FC and rally application, the top hats are a custom design from TRF who I had assemble and install these pieces, these things are serviceable with an off the shelf bearing and simple to replace. This allowed me an extra 1.5” of travel and ride height (from stock) so now I won’t be lowered in the front and raised in the rear, the car should handle much better and boy it sure did – noticeable improvements as the next day I took 2nd in rallycross (with 2 spins) and only lost 1st place by 1 cone.





The strut tower tops were already a bit beefy and they got even beefier.

I got tired of throwing cones in the front wheel bearings and if anyone here knows how much of a pain these things are a new hub is about 500 dollars but a new bearing is about 20. Don’t follow mazdatrix’s design of grind at 2 opposite ends and that gives you the space to press out the old races, just get a welder and start making a bead all the way around, then you will hit it with a mallet and it will just fall out due to the thermal expansion, it may take a few wacks but it works, you can get it most of the way and use a punch to get the race out the rest then it is just install races as you would normally would with a press.



With the suspension done it was time to move onto the fuel system.

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Old 02-13-19, 11:17 AM
  #283  
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I had about a 1 psi fuel leak at the sending unit assembly area. The threaded holes are blind and an M3 or M4 fine thread with a very short size overall so very small hardware but if you decide to use a longer bolt (which is easier to install) YOU WILL PUNCTURE THESE BLIND HOLES AND MAKE THEM THROUGH HOLES! Which means that the gasket no longer serves its purpose as it was designed to do. SO I went all out on this repair and was hoping to do it before LSPR but I was able to mend it enough where it was only a weep instead of a leak. Still not ideal though

So I went with the Stu Kelly Motorsports billet aluminum sending unit for AN fittings, also allowing provisions for fuel level sender w/ electrical hookup. Assuming that my existing sending unit was bent or warped.



And a new gas tank! (which you can still order from Mazda) as for me to repair the threads on the old gas tank was not working with epoxy/JB weld, it would need to be braised and repaired accordingly. Not something I wanted to attempt but I’m sure there are places nearby me in Metro Detroit. You do have to swap over those foam pads ontop of the tank as they are needed to position the tank correctly, this sending unit is a bit tall so I had to put more of the foam on one side so it would tilt downward slightly so the fittings would clear the floor, otherwise they were too tall and it was impossible to install the AN hoses. FYI for anyone using this sending unit.



I already had AN bulkheads to getting hoses to make the tank to bulkhead connection was easy. Since I was doing all this work and I wanted to do it once, I replaced the fuel pump with the Mazda motorsports fuel pump (stock 20B pump apparently) Now I have a very robust fuel system and out lots of money but at least it is safe and unlikely to burn down now…

Here is good comparison of it next to the walbro



So with fuel upgraded and an alignment done, wheel bearings replaced in the front the key parts were completed in preparation for SD2019.

Found out I can’t grease my u-joints with the driveshaft installed in the car so I skipped that step and just changed the rear diff fluid because the vent is relocated in the car so I hit water puddles without worrying about water contamination – problem with this is that when you cook the fluid the cab stinks like hot diff fluid which isn’t so great smelling. Never got around to dropping the trans or doing any clutch stuff, everything was working so I didn’t mess with anything, plus if I drop the exhaust I would probably just replace it, it is getting to be in poor shape and I had to patch a few welds to prevent the leaks.

After that it was just remove all of the old Rally-America stickers (that I bought for LSPR… and paid a premium for…) only to install the American Rally Association stickers another big change is going from G2 (2wd limited) to G5 (2d open) because of the rule differences – body work may be modified but must be original material/construction/resemble OEM.


Well my lights are different, the hood is fiberglass, the roof is aluminum and the hatch is plastic.

Also G2/L2WD state no porting can be done but the rule is intended to keep cars under 210-225whp so with the streetport and bodywork and with some recent stage times being overall competitive it was time to go to open class. Now I can loose about 300lbs off the car and still be in the class which will be like adding 30hp in an already quick car for ~190whp.

So Sno*Drift prep is done well what about Sno*drift itself?




1st in class regionally! (out of 3) but the other car got stuck for a long time on day 1 as well and the 3rd car DNF’d due to some car issue on Friday. Big change is that the regionally rally is 2 days long instead of two 1 day rallies.

But here is the re-cap:

Day 1 was WITHOUT HEAT!! (due to my own fault for having the heater core plunger in the wrong direction inhibiting the flow of coolant) and temps were as low as -20F. so stage 2 I stuffed it right out of the hole for no reason other than being a jerk, was able to get pulled out minutes later but ended up holding several cars up, only to crash about a mile later (going about 8mph) due to fogged up windshield with our heavy breathing from trying to be unstuck. Got tugged once more and meanwhile struggling to see and concentrate in the cold I biffed a 90* right hand corner that was deceptive #930 in the honda CRZ K series swap pulled us out with extreme enthusiasm (A+ for effort & force) and a few tugs later we were out! The rest of the day was uneventful and we managed to keep it on the road for the tight and rough stages of day 1.



Day 2. was more promising back up to middle pack out on road (and with heat/defrost!, easy fix Friday night, 5 zipties and beer) and I really enjoyed the fast wide roads but managed to make a stupid mistake on a 90* left hander, went wide and beached it about a half mile from the finish at that point, got tugged out again and carried on but this time we did not hold up anyone. Had really enjoyed the 16 mile stage, took 9th overall on the first running of that stage and was 2nd in 2wd behind #845 in the civic (which is a feat in itself as that guy is a local and the honda makes about 250whp) only to find myself passing by camp 8 on the same spot where we visit the folks of Griffin Thermal Products every year for the past 12 years to get stuck on the icy downhill section (I literally have seen dozens of cars get stuck here over the many years, it was no surprise just hot doggin' it like a jerk) Lake Effect Rally Team pulled us out quickly and then had to get the car fired up quickly (fuel pump relay got disconnected on accident by myself) and we continued on the remainder of the stages without incident and placed 10th overall on bonfire alley which was a riot!



Car came out unharmed and we had a great time! So here are the action shots!

Last edited by fidelity101; 02-13-19 at 11:19 AM.
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Old 02-13-19, 11:26 AM
  #284  
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Old 02-19-19, 12:26 PM
  #285  
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MI

here are some vids i took, go pro was having issues in the cold so here are my favorite 2 stages of the weekend.


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Old 02-24-19, 05:23 PM
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glad to see the car is going well for you!
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Old 02-26-19, 10:52 AM
  #287  
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Originally Posted by Whizbang View Post
glad to see the car is going well for you!
Definitely had some teething problems getting to this point but this should be a strong season - aiming for Southern Ohio Forrest Rally in mid May as the next event. might sneak in a rallycross and an open track day beforehand but thats about it. No major car setup changes either, its basically going to stay this way until something breaks

the 09 rx8 daily driver had the engine go out so now its just sitting waiting until this shell is used up and I will then frankenstein parts from the one to the other for the next rally build but that will still be a few years down the road.
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Old 03-10-19, 09:01 PM
  #288  
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less talk more brap!


gave a ride along to one of the winding road guys and had some fun ice racing.
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Old 03-25-19, 02:41 PM
  #289  
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With ice racing season over it is onto to tackling the to do list for SOFR race prep:




out with the old and jank!






and in with some fresh floor/heavier gauge way overbuilt nonsense! but now there isn't a rust hole by where I rest my clutch leg heel on the driver floor...

the old oil cooler is actually fine but was mounted poorly and getting bad airflow. the 2 mile course on the lake I would get oil temps at 250* by the time I crossed the line. something something 8000 rpm constantly might have had something to do with it...

so I called up my friends at Griffin again and got this sucker mounted up:



its the same volume as the stock one (~1cu inch) the but shrouded/fan poweredness of it should be a nice touch, the haltech is already setup to trigger this so I have the wiring ready to go, but here are the overall specs:
  • Overall Height (in):12.470 in.
  • Overall Width (in):12.060 in.
  • Overall Thickness (in):6.500 in.
  • Cooler Material:Aluminum
  • Inlet/outlet Size:1/2 in. NPT
now its time to measure and order up some AN lines then get cracking at the other to do list items, mostly easy stuff but it always takes longer than you think and cost twice as much. only 2 months left until the event so need to get this going quick then put some miles on it and make sure nothing comes apart.
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Old 03-26-19, 12:57 PM
  #290  
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All mounted up! time to get some lines run and installed then turn on the function in the Haltech and do a track day and see how it performs.
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