tobbeman21

Hello

I am thinking of putting a Lysholm supercharger in a RX7 1993.
Everybody is putting huge turbos in there cars but I have not heard of any using a supercharger.
Does anyone know if it has been done?
Read somewhere that it has been done in Japan in competition racing and that they were banned?

blueskaterboy

perhaps there is a reason it isn't done

tobbeman21

You just hit Your head on the nail That of course is something I need to know before I start to buy all the parts.
But of course the follow up question is of ,then why it does not work?

wwilliam54

sure, i bet it will kick ***, even with stock boost,ecu and ****

Evil Aviator

It would work just fine if you could find a Lysholm supercharger with the correct flow rate and compression ratio to make a significant improvement over the stock turbo setup.

tobbeman21

That was the plan, but I want to take it further


Finding the Lysholm supercharger that is better and will be able to produce much more horsepower is not the problem. The problem is to pick a not to big or to small. That is why I would like to now if someone else has tried it. To compare my calculations with someones else.

Aesop Rock

its been done on 2nd gens, but we don't have stock twin turbos, why not just go with a bigger turbo, i'd take that over a supercharger any day. sure you have tourque all the way through the power band, and and all but hey man its your call

Icemastr

iTrader: (2)

I would go with a 1.6L Whipple supercharger, air/water intercooler, water injection, cold side mount with custom intake manifold. Go with a ported motor that you can get it up to around 8500RPM and upgrade the supercharger so it can handle 24,000 RPM running 15-20PSI you should be able to get over 300lb-ft of torque across the entire powerband.

88IntegraLS

I'm going with a Millenia S lysholm supercharger, 25x7x3 fmic, header and highflow cat + custom catback and some form of aftermarket fuel management, with larger injectors and fuel pump or course. Oh yeah, and some street porting, that makes a big difference.

If I ever got my hands on an FD that had a blown motor, I'd probably supercharge it with a whipple charger which is also a lysholm type (screw type). Turbos are great but I'm a redneck, and I like blowers (compressors in the case of lysholm type).

andrew lohaus

but i thought rednecks just cut straight to the v8 swap?

88IntegraLS

Rednecks buy and build muscle cars and hick trucks, fabbers do interesting stuff to worn out RX7's . .

SPiN Racing

He he.. Umm Thats what Evil Just said......

Flow rate... of the SUpercharger...

Compression... Of the supercharger...

fd3s_rx7

iTrader: (13)

why waste money on a supercharge, when you can spent on tuning the stock twins as it is...

rotarygod

iTrader: (1)

Um, because those little unreliable things aren't a supercharger. Why turbocharge when you "want" (this is the key word!) a supercharger?

Evil Aviator

No, his calculations use the physical size of the supercharger, which is known as Goldilocks Physics. With this method, each supercharger candidate is reviewed only visually, and then deemed "too big", "too small", or "just right" in a quantized system of measurement that simplifies the process. It is much more advanced than the traditional fluid dynamic method of compression ratio and flow rate.

Um, yes, those little unreliable things are superchargers.
http://dictionary.reference.com/sear...bosupercharger

rotarygod

iTrader: (1)

OK technically you got me there! They aren't belt driven superchargers!

fd3s_rx7

iTrader: (13)

Well he was refering to bigger turbos too, so doesn't that means that he wants more power (Key Word). I stated the stock twins, because I know with tuning the stock twins is well capable of more HP then a supercharger. And since when did he state he wants reliability.??

tobbeman21

Hello everybody

What I want is the respons on racing on the track, since the problem with big turbos is that they spool up to late and that the twins are unreliable. The supercharger should give more response as I put the foot on the gas.

rotarygod

iTrader: (1)

Go look at his post after yours! Who is dumb enough to not care about reliability? Here's one back

SPiN Racing

Actually No They DONT if you pick the right exhaust housing for your application.. to tune when it comes up on the RPM. YOu can also put a slightly larger Wastegate plumbed back into the exhaust system. With the proper exhaust side tuning you can have a larger turbo coming on boost early, and staying there with the wastegate controlling the rpm of the turbo. BUT.. this will take a larger wastegate to control the exhaust bypass factor.

The turbos that only come on boots at the high rpm ranges very likely have a too large exhaust housing, and a small wastegate. If they were to use a smaller exhaust housing it would come on max boost sooner, and then using a larger wastegate, they could keep the EGT down, and the flow up. Hence the engine would start with max boost sooner, and the power would be higher earlier on. All that equals more performance across the spectrum and less "lag"

slow wankle

you could always twin charge it. leave the stock twins and run them into a rooter style supercharger. It will reduce the efficency of the turbos, but not enough to hurt performance too bad. but you need to do what you want to do. all these folks are turbo guys, so they will give their opinions, but if you do supercharge it, I want to hear how well it works. good luck!

Evil Aviator

Hehehe, you underestimate the size of a "big' turbo that most of the people on this forum like to slap on their engines. It is common internet thinking that more boost = more power, so these guys try to produce as much boost as possible, no matter how inefficient their methods, and then they complain about lag, lol. Anyway, the big compressor wheels require a larger turbine housing in order to supply enough torque to keep the turbo supplying high boost levels at higher flow rates.

MrBojangles

I know this is not what you had in mind, however it is a supercharger, it is universal, and it is pretty interesting no matter what.

http://www.boosthead.com/home.php

Uses an eaton blower I believe. Takes 20 min to recharge with a larger alternator and gives 15 seconds of boost. Like nitrous with no refill.

Good read...

slow wankle

wow, thats nes to me. so when you want the power you just hit a button? or is it on all the time?

I still think that the twin charging would work, but I'm not positive, and it would make plumbing a bit difficult.

MrBojangles

Yup, just flip the switch for 15 seconds of boost, then it recharges (20min for full recharge) and you are ready for another race.

We were studying these on honda-tech.net, whole kit only adds about 35lbs nearly same as turbo, or another supercharger w/ pulleys, and that inlcudes the weight of the 3 battery packs.