How do you like the detroit rockers? When I get cams those are first on my list of possibilities right now, because of the sound...but did you get a good performance difference from them too?

 

Norm... do you have a theory on why when I went from 3.55's to 4.10's
I actually spun less on launch? I dunno maybe I'm a freak exception to the rule but my launches became easier and I felt like a grabbed the road more. As I said it also got rid of my wheel hop.

I have the Nitto 555's. 275/40/18's all the way around.
I just feel like the 4.10's allowed me to dig in more. Others have acted like I am crazy when I told them this but I have had a few shops told me in fact that this did not suprise them once they sat and thought about it.

I have thought about going with a wider tire in the back to add a little more agressive look as well.
I have the Saleen replica wheels 18x10's and I was wondering what I could go with to add some more width but not go too far and also not take away from the ride as well.
Someone told me I could go with 305's but would I go with 305/40 or what?

 

Theory: maybe you're spinning more out of the waterbox than you were before so that by launch time your tires are hotter and stickier.

 

I don't know enough about the way you drive, but is it possible that you aren't leaving with quite as many rpms showing now compared with before (with the 3.31's or 3.55's)? Or that the 4.10's work better with however much slip you tend to naturally allow to happen? There is the human component to this kind of co-ordination, and we don't all do things in precisely the same way or with exactly the same speed.

What I think I'm seeing is that you are less apt to let too much flywheel momentum get fed into the tranny from it dropping too many revs (or dropping revs too quickly as it grabs) now, as compared to before.

The first inch or so of rear squat under acceleration causes anti-squat to decrease, at least that's what a few measurements I took on my car plus some math are indicating. IOW, the amount of geometric resistance to squat decreases, so however much "planting" happens at the first instant of acceleration actually decreases slightly as the squat first starts to develop. If you manage to get "squatted" an inch and a half or so without getting hop, your anti-squat starts to increase again. When A/S is increasing, the suspension geometry is working harder to increase how hard the tires are being "planted". I am assuming at this point that you do not have LCA relocating brackets (aka antisquat brackets).


Either a 305/35 or a 305/40 is OK on 10" wide wheels. But you'll want the opinion from somebody who has run that combination and you'll also want to know what offset their wheels were so you can tell what the effect of any difference in that would cause. The best I can offer is spreadsheet plots of tire shapes like the one in here, since I haven't seen on actual S197's anything wider than the GT500's 285/40 on 18 x 9.5 x +45mm wheels. Even without knowing the offset of your wheels, I can at least plot the 305's against your 275's on the same rims.

 

I love them and i have gained some nice power. The sound is great with the flowmasters i have even though i just noticed they are not in my sig. U can feel the cams in the cabin of the car. At first when they were installed and i got my tune from brenspeed. THe low end power loss was like stock again which I new was not right. So I called them and explained to them my problem and they sent me a new tune via email and i couldnt be happier. Expect a little loss down low but not much. Im guessing around 15 more hp out of them. I dont have longtubes so if ur looking to get more of them then u will have to add some headers. Im going a different route and adding a saleen supercharger next spring. Hope this helps

 

Yes it does. From sound clips I've researched I think they are the coolest sounding cams out there. 15 hp gain isn't bad with stock manifolds. That is what I would be running first too. Then headers and full exhaust later down the line. Thanks.

 

Wanted to make this clear that the 15 is just a guess. I asked chandler at brenspeed and he thought that was about right.

Oh and when i first had them installed i put an h pipe on with the flowmasters. That thing sounded badass at idle but going down the road the trumpeting was bad so thats why i opted for high flow cats. It cleaned up the sound and no trumpeting.

 

I will speak with Brenspeed and ask if I would be better served to upgrade exhaust before the cams. Was hoping to do cams first but will do whatever makes the best sense.

 

I also wonder this....
I had a light weight steel flywheel put in with a clutch change.
Before I had a heavy 28pound flywheel.

This steel flywheel I have in there now is actually almost as light weight as an aluminum. It weighs in at only 16.1 pounds.

I put it in because of the trouble people were having when they did not match the flywheel to this company's clutch (Exedy). There were even reports of trouble with stock flywheel use on them from a couple of people I spoke to. Plus I liked the security of a SFI approved one and not having to worry about it ever coming apart on me.

I would think that the lighter weight flywheel might give me MORE trouble though at lauch wouldn't you? RPMs need to be higher when launching with these afterall.....
And no LCA's either.
Wonder what gives?

 

It can, as there will be less 'inertia help' available from it. Needing more revs is common, but perhaps not universal (goes back to the individual person).


Norm