mrfred

iTrader: (50)

No change in lag on my Evo with any of the four different exhaust manifolds I've used. The factory cast manifold has pretty large cross-section runners. An argument could be made that lag could be increased if the total volume of the EM is higher, but I think the increase in volume of a 1.5" tubular header is minimal compared to how much air a turbo is moving.

JohnBradley

iTrader: (30)

This was with the ETS 1.5"?

Out of curiosity how did they come to the conclusion it was the header? Dyno testing with back to back timing curves, boost curves, and AFR, or butt dyno? I dont mean to sound disrespectful I am honestly interested in knowing because I was surprised how much faster this was spooling as well. Everything said that it should be worse based on popular opinion, the big plenum short runner intake manifold, larger cams, and the header, yet it was 180* out from expected. The changes here were SD, parts listed, tune. The preload was left the same because we never thouch that without reason and after asking to make sure it was ruled out.

Aaron

nismogtr34

iTrader: (7)

I don't remember much of the specifics (since the thread was over a year ago on TSE). Yes, they had the ETS 1.5" installed and that was the most major part changed out. It was done through a butt dyno, but I guess that's not a good form of measurement. However, is there a reason why ETS would list the manifold for different power levels?

JohnBradley

iTrader: (30)

The actual paper engineering might say that is acceptable. I havent ever tested the smaller ETS header so I cant say.

Dynotech Tuning

iTrader: (12)

I have found the TruBoost systems shortcoming was its maximum allowable duty cycle was 90%. I'm not sure if you were near this WGDC or not to hold boost up top or not though.

-Jamie

JohnBradley

iTrader: (30)

This car just doesnt want to hold boost without tapering for some reason. The other HTA Green cars havent had that issue, MBC or Tru boost. In order to fix that I just wired the solenoid into the ECU and tuned it that way.

Aaron

Dynotech Tuning

iTrader: (12)

I have had the same anomalies happen as well on HTA greens and standard REDs, even on cars with the exact same mod lists and checking all of the usual suspects like boost leaks, wastegates, valve overlap, etc...

-Jamie

JohnBradley

iTrader: (30)

Thats what I thought was going on with this one, so we checked preload and even after making an adjustment it seemed to be the same. 3 port got the boost where it needed to be to make the power but its odd that Brett's car (virtually identical build) held 26 through the mid range with just a Hallman.

Matatan

iTrader: (1)

Nice numbers