89 crx launching problems
DirtyD777
06-07-2004, 05:07 AM
Hey all I'm new to this forum and I have a question to anyone experienced enough to answer it. okay the question IS:
I have a 89 crx and so far I've put a newer D15 from japanengine.com and changed the intake manifold to MPFI (multi point fuel injection) from a crx si, also added a cold air intake, 4-2-1 header and solid 2.5 inch exhaust with no cat and a Stage2 Exedy Clutch and Flywheel. now my problem is I simply can't find a happy point for launching this car I've tried dumping the clutch at 2000-5000 rpm and the result is always just a really bad shaking in the front and wheel spin/hop. I know it's not the shocks because they are ALL new so this leaves me to beleive it's my rims and tires, they are 17"konig verdicts w/ low profile tires, are these the cause of my problem or is it the motor mounts? I've heard low profile tires just don't grip the road at all. I've tried lowering and raising psi in them to and still always the same. would I be able to launch better with say 16's or 15's ? I know in my accord that I have on 15s you can drop the clutch and it jumps forward I'm really getting discouraged here with this so any advice is welcome. I've also heard of feathering the clutch but I just don't see how that would work..anyways thanks in advance to everyone =)
I have a 89 crx and so far I've put a newer D15 from japanengine.com and changed the intake manifold to MPFI (multi point fuel injection) from a crx si, also added a cold air intake, 4-2-1 header and solid 2.5 inch exhaust with no cat and a Stage2 Exedy Clutch and Flywheel. now my problem is I simply can't find a happy point for launching this car I've tried dumping the clutch at 2000-5000 rpm and the result is always just a really bad shaking in the front and wheel spin/hop. I know it's not the shocks because they are ALL new so this leaves me to beleive it's my rims and tires, they are 17"konig verdicts w/ low profile tires, are these the cause of my problem or is it the motor mounts? I've heard low profile tires just don't grip the road at all. I've tried lowering and raising psi in them to and still always the same. would I be able to launch better with say 16's or 15's ? I know in my accord that I have on 15s you can drop the clutch and it jumps forward I'm really getting discouraged here with this so any advice is welcome. I've also heard of feathering the clutch but I just don't see how that would work..anyways thanks in advance to everyone =)
fugiot
06-07-2004, 03:36 PM
17's are a bit too big, but you might want to try NOT dumping the clutch and launching clutch-feather style. Especially with a stage 2 clutch kit, it probably grabs too hard for those 17's.
DirtyD777
06-08-2004, 03:04 AM
okay I'm trying this feathering the clutch method all day today and I can't seem to get it right. It feels like I'm just slowly lurching forward off the line not launching, anyone have some good tips for feathering the clutch off the line?
joebowlr21
06-08-2004, 12:46 PM
I would suggest getting your car dyno'd.Now you are gonna ask why right? simple answer.Once you have your dyno results you can see where your powerband is and from this you can find the ideal RPM to launch your car from.
DirtyD777
06-10-2004, 01:35 AM
Sounds good. I would have had my car on the dyno along time ago but I live in kinda a small..well actually a REALLY small town and the nearest city is about 90 miles away. Do you have any rough estimates of what a run on the dyno cost? Thanks for everyones input so far!
joebowlr21
06-10-2004, 04:02 AM
i would ask in the honda tech forum.They will give you stats on ur motor there.
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