No worries. Thanks for all your support.

 

I am really hoping to see a lot of you from the NY and Philly areas at our Oct 7th private dragstrip rental at Atco dragway. Time to stop the dyno wars and get to the real world and see how these newly modded monsters perform in the real world.

 

RedGutz kills a full bolt on 600 wheel horsepower GTR from a 45 mph roll three times in a row. My answer to some of these rather surprising Dyno runs which clam that the GIAC tune makes crap power.

 

I have taken my headers off my car as the lost power and torque

 

Did you dyno at GIAC with and without the headers ?

 

I did but at Champion Motorsports. We were both very disappointed with the results. Had they made power champion would have started selling them

 

Adam, yes the turbos spooled up a little slower also. Didn't loose as much as the Sdg's headers, I have stock exhaust manifolds back on now.

 

Which headers did you have to Mark?

 

Sam I had Fabspeed, along with cat and catless exhaust

 

Ok thanks. Maybe that mod is good when we are at 1,000 wheel. But in the 600 range clearly not based on your dyno and sdg's dyno. See you in a couple days buddy.

 

I am told by one of the top tuners that aftermarket headers will make sense with upgraded turbos but not with stock turbos and that none of the aftermarket headers they've tried have gained power on stock turbos and all have resulted in power losses.

 

Here is my dyno with the FVD headers, IPD Plenum and FVD exhaust with 200 cell HJS cats. No power loss shown there until after adding the FVD piggyback. The results on SDGs car were related to the tune and not the components as I think this dyno data clearly demonstrates. The curves for normal and sport plus with only the boltons are in green and blue. Those curves DO NOT SHOW ANY POWER LOSS. The red curve with the piggy back shows a power dip in the range from 4200rpm to 5500rpm. That would be related to the effect of the piggyback tune, not the boltons themselves.

Please let's drop this because this dyno data refutes the claims made. SDG, run your car without the GIAC tune and prove the headers make the difference. Champion didn't do that but Cobb did. So I have real data for the boltons, sorry, this business of headers cause power loss is nonsense. Tunes may not work as well in certain rpm ranges with headers as they do with the stock manifold. However, using a 22.5% loss rate on HP, my car with the boltons only in SP mode actually produced 612hp with the boltons or about 50hp more than stock.

 

On what measuring device did it lose power and torque? In addition was this with the stock ECU or a modified ECU?

 

Thanks for the Dyno runs. All I know is that with the GIAC tune the headers causes the car to lose power even when they repeatedly tweaked the tune to try to gain power.

I will revisit the question of headers for my car if I do the VTG upgrade which I am now leaning toward doing.

 

The stock ECU has no power loss with the headers, there is a power gain across the RPM range against the stock components. The car makes 52hp more than stock with boltons only. The variable in your setup was not the headers, it was the tune. Note that the addition of the FVD piggyback produces a similar power loss in my dyno data. So please tell me how you can blame the power loss on the headers? The data contradict your conclusion.