vader1

People have made more power than I am making in hotter climates, and I switched to the TVS blower from the MP62 which is supposed to reduce outlet temps by about 30 degrees. I don't think blower heat is the problem here. Nobody elses falls flat at 7000 rpm.

camuman

No kidding. What boost were you seeing and we blower maxed out ?

sohc_mshue

cat is very likely clogged

vader1

No kidding. What boost were you seeing and we blower maxed out ?
[/quote]

It is a 6 pound pulley, I see a little higher than that sometimes when I think it is pulling timing. Cat is not clogged, practically new. I think the fact that my exhaust comes out of only one side during idle is probably a giveaway. I am trying to find a video with a little visable exhaust out of an S2000 at idle. But seriously, you have to rev mine past 3000 before any comes out the left muffler at all. If you just let it idle NOTHING will come out the left side. I don't know if that is typical. I bought the car with 12,000 miles on it, but it has been that way as long as I can remember.

camuman

No kidding. What boost were you seeing and we blower maxed out ?
[/quote]

It is a 6 pound pulley, I see a little higher than that sometimes when I think it is pulling timing. Cat is not clogged, practically new. I think the fact that my exhaust comes out of only one side during idle is probably a giveaway. I am trying to find a video with a little visable exhaust out of an S2000 at idle. But seriously, you have to rev mine past 3000 before any comes out the left muffler at all. If you just let it idle NOTHING will come out the left side. I don't know if that is typical. I bought the car with 12,000 miles on it, but it has been that way as long as I can remember.
[/quote]

well, on a 6psi pulley i think it might be more accurate then we all think. look at my sot dynos, the 306 whp one was 6psi with an aftermarket exhaust...i think. crap, i cant remember when i got it. might be stock. hmmmmm. ok, i dont remember, been awhile, but point is i made around 300 also on similar boost. can you up that bad boy to 10? what are iat temps? they still soaring? how much timing is there at peak boost peak rpm? can you post data logs of the pulls?

camuman

post the dyno also!

s2000Junky

Instead of guessing and investing money in a new exhaust system, try unbolting the cat back and just dyno the header. That should tell you right there if you’re current system is a restriction costing you any power. My guess is the more boost you run/power you want to make, the more that high flow cat isnt going to be so high flow anymore, its going to still be the most restrictive and turbulent part of the whole exhaust system. It’s also just a matter of time before it does finally melt and really cause a blockage, your EGT will sky rocket at that point, which is bad news if not caught in time and you continue to drive the car.

vader1

No kidding. What boost were you seeing and we blower maxed out ?
[/quote]

It is a 6 pound pulley, I see a little higher than that sometimes when I think it is pulling timing. Cat is not clogged, practically new. I think the fact that my exhaust comes out of only one side during idle is probably a giveaway. I am trying to find a video with a little visable exhaust out of an S2000 at idle. But seriously, you have to rev mine past 3000 before any comes out the left muffler at all. If you just let it idle NOTHING will come out the left side. I don't know if that is typical. I bought the car with 12,000 miles on it, but it has been that way as long as I can remember.
[/quote]

well, on a 6psi pulley i think it might be more accurate then we all think. look at my sot dynos, the 306 whp one was 6psi with an aftermarket exhaust...i think. crap, i cant remember when i got it. might be stock. hmmmmm. ok, i dont remember, been awhile, but point is i made around 300 also on similar boost. can you up that bad boy to 10? what are iat temps? they still soaring? how much timing is there at peak boost peak rpm? can you post data logs of the pulls?
[/quote]


6psi is max blower speed for this TVS on an AP1. 6psi was getting 300-315 on Ap1's with the MP62, the point of the TVS was to lower intake temps and increase timing. So I would expect more than that. I am not at work and can't scan my plot but just picture the line shooting upward until 7000 rpm then just a flat wobbly line to 9000. That is pretty much it. Without the flat line it looks like it will make 330-340 on 6 psi, and that is probably it unless I want to overspin it but I don't. Since you can get 7 psi on an AP2 I would guess a SOT/TVS kit could have made 360-370hp at 7psi but I have to get my exhaust sorted and get final numbers to be more sure of that.

I am pretty sure it is the exhaust. LJ was telling me anytime he has seen something like this on an S2000 is was an exhaust restriction and he has seen a lot of S2000's. He said it wont take any more fuel beyond 7000 because it wont flow any more air. And seriously, if you put one hand in front of each pipe and have someone rev the car, the amount of exhaust you feel out of each pipe is so unequal it is obvious. Just tested that out with LJ.

I think the problem is pretty much solved, it is just a question of chopping off the stock mufflers, the good one and the plugged one, and putting two Borlas on. I don't have any cash to do this until next month, going on vacation. But I can say it is pulling very smoothly and fairly hard as it is, I just lay off at 7000 and shift until I have the cash and time.

He did suggest drilling out the manifold for a GM air temp sensor instead of the Honda, but I don't know if that is worth the time and effort.

s2000442

If you don't want loud and drone get a used oem exhaust.

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racecarpete

Interested to hear what the fix ends up being. Please update thread.