zbrewha863

Well I know I started a thread on a Dyno Day in JAX, but I was getting my springs put on today at Velocity Trends and ... one thing led to another ... I had them bolt on my prototype RS*R 70mm single exhaust today, and do a before (baseline) and after dyno comparo. I'm sure there will be some discussion, and I could go on for probably 3 paragraphs, but I will just let the #s speak for themselves for now.

Behold the wonder!



The first two runs (baseline) are blue, the second two are green and red, respectively. The #s indicate the order in which they runs were made.

Edit: If you click on the picture a couple times, it will enlarge to full size, here are the #s:

(all stock, baseline)
First pull: 187.32hp/128.91tq
Second pull: 185.33hp/138.67tq

(with exhaust)
Third pull: 184.61hp/127.23tq
Fourth pull: 181.81hp/125.35tq

Weather was around 92*F all day, air pressure was 30.33in-Hg, Humidity was about 80% (doesn't show on sheet), pulls were done back-to-back w/o ice on engine or manifold, and on the second and fourth pulls the auxillary fans kicked on so the car was fairly hot.

Raven628

I did not bring my magnify glass to work. Can't make the numbers out.

Could you post them.

I am sure we all will appreciate it.

Thanks.

zbrewha863

Post edited, check it out.

AznCantonS2k

so you lost power?? =( how was the AFR??

Sub-Zero

So no prototype exhaust????

RadioZero

just curious if the ECU needs time to adapt to the new exhaust?

hygiene boy

Most new cars and especially the S2000 are so maxxed out/tuned from the factory that any simple bolt ons are mearly good looking noise makers at best. Many people loose hp from exhaust/intakes or gain a couple hp here and there in the rpm's but loose it elsewhere. It seems like a wash from looking at the dyno's to me.

zbrewha863

That's the weird thing -- after they put the exhaust on, they basically started it up and immediately did a pull -- the AFR was around 12 the entire time! I think they just didn't give the ECU time to learn the exhaust, b/c I got about a point richer on my AFR after I bolted the exhaust on ... which is weird, b/c I thought it would lean out a little after the exhaust.

zbrewha863

Yeah I realize that, but every other 70mm single I've ever seen on here has picked up 10-15whp, this exhaust is basically a stainless version of an Amuse R1000 w/ a carbon fiber muffler, I would definately expect it to make some power.

dc2-2-ap1

sucks to hear that, it is a really nice looking exhaust though. are you running a test pipe? hows the drone?