Stillen Headers and HFC's Before/After Dynos
Thread Starter
Former Sponsor
iTrader: (2)
Joined: Feb 2006
Posts: 1,032
Likes: 0
From: Marietta, GA
Stillen Headers and HFC's Before/After Dynos
One of our local customers dropped his G37C off to install some Stillen Headers and High Flow Cats (customer provided them). He already had the Stillen CAI and Stillen exhaust on the car prior to its arrival.
We did before and before dyno testing, and I just wanted to share the results. No tuning was performed at all....just straight dyno pulls. There are many ways to do these types of comparisons, to make the gains look bigger, but we don't do that.
We run the car at baseline until it stops making power. This becomes our "before" number. Then we repeat the process of our "After" runs. Since power can vary from run to run, we always choose the best "before" run, and the best "after" run,
The end result was a 17whp improvement, and power and trq improvment across the board.
We did before and before dyno testing, and I just wanted to share the results. No tuning was performed at all....just straight dyno pulls. There are many ways to do these types of comparisons, to make the gains look bigger, but we don't do that.
We run the car at baseline until it stops making power. This becomes our "before" number. Then we repeat the process of our "After" runs. Since power can vary from run to run, we always choose the best "before" run, and the best "after" run, The end result was a 17whp improvement, and power and trq improvment across the board.
Registered User
Joined: May 2003
Posts: 121
Likes: 0
Sweet! Thanx for info!
I like the torque between 2250-4500 RPMS Plus less drop off in HP near redline.
Plus A/F looks a little rich in mid to upper RPM's. Imagion tuning A/F and timing!!!
Do you know what the stock dyno was?
I like the torque between 2250-4500 RPMS Plus less drop off in HP near redline.
Plus A/F looks a little rich in mid to upper RPM's. Imagion tuning A/F and timing!!!
Do you know what the stock dyno was?
Trending Topics
Registered User
Joined: Apr 2006
Posts: 1,499
Likes: 8
From: Los Angeles
nice..seeing how stillen's exhaust frees up at least 7whp with the 17whp header and HFC combo i think we can see at least an additional 10whp with a reflash looking at those afrs...i can't wait for cams...cvt<---thinking about breaking his promise to NOT mod his G37...
Thread Starter
Former Sponsor
iTrader: (2)
Joined: Feb 2006
Posts: 1,032
Likes: 0
From: Marietta, GA
