Installed Headers - New Dyno Numbers
#1
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Installed Headers - New Dyno Numbers
Well, being in this business, I can't leave well enough alone, lol. We have a customer who had a F1C Procharger on his car and he had some very nice Stainless Works Headers and X pipe on it. They are 1 3/4" primaries and 3" X pipe. This is probably too large for a minor bolt on car, but since I'm going to put a Whipple on and eventually build the engine, I decided to buy them from him. We are doing a custom turbo kit on his car and he doesn't need them.
To keep it simple, I installed the header and X pipe, and then just adapted the 3" X to the stock 2.5" catback pipes and left my Mac mufflers on. I wasn't expecting a ton since these are pretty large for what I have right now. I'm pleasantly suprised by the results. It's a bit too loud for my taste but the sound quality is good (not too raspy). As you can see by the run number on my graph, I do alot of dyno testing on my car! I haven't had it 2 months yet.
Before numbers: 270.53 rwhp 287 rwtq
That is with:
Modular Depot CAI
Mac Mufflers
4.10 gears
Stock manifolds and cats
After numbers: 288.56 rwhp 306.28
Only changes were the headers and off-road X pipe
That's roughly
360/380 at the crank
or
306 rwhp 323 if it were a 5 speed.
To keep it simple, I installed the header and X pipe, and then just adapted the 3" X to the stock 2.5" catback pipes and left my Mac mufflers on. I wasn't expecting a ton since these are pretty large for what I have right now. I'm pleasantly suprised by the results. It's a bit too loud for my taste but the sound quality is good (not too raspy). As you can see by the run number on my graph, I do alot of dyno testing on my car! I haven't had it 2 months yet.
Before numbers: 270.53 rwhp 287 rwtq
That is with:
Modular Depot CAI
Mac Mufflers
4.10 gears
Stock manifolds and cats
After numbers: 288.56 rwhp 306.28
Only changes were the headers and off-road X pipe
That's roughly
360/380 at the crank
or
306 rwhp 323 if it were a 5 speed.
#2
Cobra Member
Nice gain for headers & X-pipe. Any guess as to what gains you got eliminating the cats?
I'm considering going with a O/R H & I've heard that just eliminating the cats gains approx 8-10HP.
I'm considering going with a O/R H & I've heard that just eliminating the cats gains approx 8-10HP.
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#7
Nice numbers!
I see you don't mention a tune anywhere, so I'm assuming you did not optimize the tune for the headers? I wonder how much more there is left in them, if that is the case.
I see you don't mention a tune anywhere, so I'm assuming you did not optimize the tune for the headers? I wonder how much more there is left in them, if that is the case.
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