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GT4RSX
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Anyone had any experience with the Comptech or Jackson Racing superchargers vs the Greddy or HKS turbos? I saw an S2000 with a Comptech supercharger recently and it's got me thinking now that I'm only missing headers...
Am I better off just going part way and getting headers and an ECU upgrade? Is the supercharger asking for more trouble than it's worth?
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CivicB18
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I take it you have an RSXsince your screen name has "RSX" in it, but you didnt specify if it was a Type-S or not. Please give more info.
Patrick
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BOOMER
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Why buy a forced induction system and put it on a rev-happy 4 w/a high compression ratio? Its a recipe for disaster, IMO, and I owned a 91MR2 w/Factory Turbo for 7 years. CR was 8.8:1 on the MR2T, what is it on the S2000, 10.8:1 or 11:1? You would need to lower the CR to keep it from blowing up and add a lot of hardware, & $$$$! If you have the model w/the 8900 redline, it would be even harder to make it work.
The S2000 is already a 4 wheel motorcycle or Formula Ford for the street, why upset its balance w/FI? I think its a bad idea, but its your $. Whatever you do, I would invest in a high performance driving school so you know the limits of your car's performance. Not very many drivers can use all the power of a bone-stock S2000, much less a modified one.
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BOOMER
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HMMMM. Just noticed the RSX, I thought you were talking about an S2000 that you gave as an example. If you have the S, my caution still stands; too high CR, redline, etc. Buy a Mustang V8, it would be cheaper and faster after you were done w/the RSX.
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Andyyrsx
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what can you do to lower CR?
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JonBoy
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Andyyrsx wrote:
what can you do to lower CR?
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Change out your pistons for slightly shorter ones. Compression ratio is the ratio of volume in the cylinder when the piston is at top dead center compared to bottom dead center. If your pistons are shorter (shorten the stroke, essentially), your CR drops...
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Karl O.
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BOOMER wrote:
Why buy a forced induction system and put it on a rev-happy 4 w/a high compression ratio? Its a recipe for disaster, IMO, and I owned a 91MR2 w/Factory Turbo for 7 years. CR was 8.8:1 on the MR2T, what is it on the S2000, 10.8:1 or 11:1? You would need to lower the CR to keep it from blowing up and add a lot of hardware, & $$$$! If you have the model w/the 8900 redline, it would be even harder to make it work.
The S2000 is already a 4 wheel motorcycle or Formula Ford for the street, why upset its balance w/FI? I think its a bad idea, but its your $. Whatever you do, I would invest in a high performance driving school so you know the limits of your car's performance. Not very many drivers can use all the power of a bone-stock S2000, much less a modified one.
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Lots of people have supercharged S2000s that work well, the Comptech and Vortech setups are pretty much plug and play. The F20 and F22 are very stout, the biggest headache can be getting the OEM LSD and clutch to survive.
I've never driven a S/C'd S2000 but the people that have them seem to think the balance of the car is still good, the S/C doesn't change the shape of the car's power curve all that much, it just increases the power output.
I don't think I'd ever s/c my S2000 but there are tons of folks that love their S2000, they just want something a little faster and FI does the job.
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JeffX
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Karl O. wrote:
BOOMER wrote:
Why buy a forced induction system and put it on a rev-happy 4 w/a high compression ratio? Its a recipe for disaster, IMO, and I owned a 91MR2 w/Factory Turbo for 7 years. CR was 8.8:1 on the MR2T, what is it on the S2000, 10.8:1 or 11:1? You would need to lower the CR to keep it from blowing up and add a lot of hardware, & $$$$! If you have the model w/the 8900 redline, it would be even harder to make it work.
The S2000 is already a 4 wheel motorcycle or Formula Ford for the street, why upset its balance w/FI? I think its a bad idea, but its your $. Whatever you do, I would invest in a high performance driving school so you know the limits of your car's performance. Not very many drivers can use all the power of a bone-stock S2000, much less a modified one.
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Lots of people have supercharged S2000s that work well, the Comptech and Vortech setups are pretty much plug and play. The F20 and F22 are very stout, the biggest headache can be getting the OEM LSD and clutch to survive.
I've never driven a S/C'd S2000 but the people that have them seem to think the balance of the car is still good, the S/C doesn't change the shape of the car's power curve all that much, it just increases the power output.
I don't think I'd ever s/c my S2000 but there are tons of folks that love their S2000, they just want something a little faster and FI does the job.
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I drove an early version of the comptech supercharger kit for the s2000 and it introduced a whole new level of vibrations to the drivetrain. I've heard that the newer designs are better but I'd like to drive one to see. But as for upsetting the balance of the car, I don't think there was any problem at all with the additional power. The bottom end was a little lethargic but above 5000 rpms or so you could feel the supercharger ramping up the power. While I would love to be able to run 12's in the car, I personally prefer the feel of the naturally aspirated motor. Throttle response suffers a bit with the supercharger kit too.
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Andyyrsx
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JonBoy wrote:
Andyyrsx wrote:
what can you do to lower CR?
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Change out your pistons for slightly shorter ones. Compression ratio is the ratio of volume in the cylinder when the piston is at top dead center compared to bottom dead center. If your pistons are shorter (shorten the stroke, essentially), your CR drops...
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so would toda pistons for example do the trick? (along with connecting rods cams and springs as well)
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JeffX
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JonBoy wrote:
Andyyrsx wrote:
what can you do to lower CR?
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Change out your pistons for slightly shorter ones. Compression ratio is the ratio of volume in the cylinder when the piston is at top dead center compared to bottom dead center. If your pistons are shorter (shorten the stroke, essentially), your CR drops...
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uh, quick note - by going to "shorter" pistons as you describe, you would not be reducing the stroke. The only way to do that is with a new crank. But you would be increasing the volume of the combustion chamber, both at TDC and BDC. The displacement of the piston remains the same through this stroke though, since the stroke and bore are the same, but now your denominator (cylinder head volume at TDC) is larger so the compression ratio is smaller. I hope my description makes sense...
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BOOMER
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I never consider a "pure" sports car as a drag racer, so FI for the street is overkill to me. The SCCA doesn't allow FI except in modified classes, I believe, so where do you drive your FI'd S2000? On the street or dragstrip? Will it be like a lightswitch, either full on or full off w/turbo? Will it affect drivability as Jeff has described on the S/C?
HKS modified a 92 MR2T when I had mine for about a year and the result was unacceptable to me. It had a bigger turbo w/more lag and it was too unpredictable to drive fast on the street. S/Cs are OK, I guess, but anything that affects drivability adversely is not for me, I buy cars for street, cornercarving and highway driving. Anyone else is welcome to modify their car any way they want for any purpose.
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full blown
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I have a 02 rsx-s with a JRSC 6.5LBS BOOS WITH K-PRO AND IT WILL BLOW THE DOORS OFF A TRANS AM.
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