I re-read back through your mod list and those results are good for your mix of parts. It's not near the peak capability of that turbo, though. If you change just a few things (lose the cat, get a clutch that can hold it, change cams) that thing should make 500whp/500tq no problem. . .

Just swapping to an HTA Green from the BBK will not gain anywhere in the realm of 50hp/50tq.

 

No doubt the cat has to go. Switching to SD should help substantially. I'm still on the stock MAF with honeycomb. I agree the cams are a bit suspect, but according to Aaron, they are pretty close to an S2, so that's good enough for me unless easier things like removing the cat and switching to SD don't give good gains.

 

I'm diggin on the Pr measurement as well.

it would be cool to see the Pr reduction when going catless & then lets say throw on the oem exhaust & do another pull. that way you would be able to calculate a whp / 1" Hg

Next to a dyno, this device would awesome to test o2 housings, dumps, catbacks, etc.

Nice work

 

I think you're missing the cam timing adjustment and improvements that can be seen here. I think this is just an open door to re-tuning the camshafts after you can reduce Pe. I think you're going to see a boat load of improvement in the cam tuning as a result of the Pressure Ratio improvement.

 

Since you guys are chatting about Pex/Pin, here is the MIVEC map that I used on the dyno. I focused mainly on minimizing overlap for Pex/Pin > 1. It might benefit from more overlap in the lower rpms where Pex/Pin ~ 0.5. Depends on whether the intake charge is shooting right through the cylinder and out the exhaust when the ratio is this low. Guess just try it and see. :-)

 

regardless of cam timing or the color of your girl friends panties, reducing Pr within the exhaust system will result in more power on turbo charged cars.

 

One post-turbo would be good too. Its going to be pretty easy to do this in the very near future because EvoScan v2.9 (TBR) adds support for a 8 input ADC -> USB converter:

http://www.evoscan.com/evoscan-gps-o...nel-0-5v-input

 

Pr is additive. So if it's backed up, the pre turbo sensor will see it too. At the track, we relied on the pre turbo Pr measurement.

 

English Racing had a bit of time this afternoon, so I headed over there for some exhaust system testing. Going to a test pipe had pretty much no effect on power (or sound levels). Guess its safe to say that the Mil.Spec 100 cell cat is as good as a test pipe to 500 whp. However, unbolting the exhaust after the test pipe and doing a few dyno runs resulted in 15 ft-lb torque gains but no peak whp gains. Seems that the back pressure from the turbo is dominating the peak whp.

 

Do negative numbers normally correspond to negative positions on a standard mivec car? ive never seen that before, and Im not sure if your's is ER special

Oh yeah.. cardboard pics

 

finally put the test pipe on! its about time

Did you see that sexy Blue car down there today ....

 

Lucas wouldn't let me drive it. Have to wait until you bring it back to Tri-Cities.

 

Good to know. I have the same cat and always wondered where it would be a bottleneck

 

were you able to measure any differences with your pressure sensor when trying all your different exhaust configurations?

can you post a pic of your rre stealth exhaust while looking under the car?

 

See, everyone likes to blame the cat. Now what are people going to say? Woot!


Did you miss the part where he said the test pipe made no difference?

FYI, previous dyno compares between the MIL.SPEC cat and a test pipe from GST showed minimal gains with a test pipe.