Informative: Exhaust Tuning, what part of the system actually tunes
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Joined: Nov 2008
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From: Czech republic
I see nothing in that thread that says I'm wrong 
You changed a lot more than just the size of the exhaust, proving ONLY that the total package you ended with is better than the one you started with and the size of the tube used is only a part of that, this thread was even about informing people that the exhaust is a compleat system * to recap, the compleat system you ended with was better that the compleat system you started with and there is no data proving that a compleat system with a smaller diameter tube would not be even better / worse*
You changed a lot more than just the size of the exhaust, proving ONLY that the total package you ended with is better than the one you started with and the size of the tube used is only a part of that, this thread was even about informing people that the exhaust is a compleat system * to recap, the compleat system you ended with was better that the compleat system you started with and there is no data proving that a compleat system with a smaller diameter tube would not be even better / worse*
Right on, not even mentioning that pipe diameter usually isnīt restriction, mufflers are...
Joined: Jul 2002
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From: District of Columbia
The rest will be a bit different.
Joined: Jul 2002
Posts: 7,301
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From: District of Columbia
well I've got my dyno appt tomorrow with the 3" collector back no more expansion chamber. Same dyno I did 189.65 on. lets see if it actually worked. Honestly I'm going to be pissed if I lost power removing the expansion chamber.
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Joined: Jul 2002
Posts: 4,181
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From: Houston
It will be interesting to see the result. If you lost power, it will mean you've found a setup that works better than this one which is very possible. At the very least you'll learn something and that's always a good thing!
The collector is different now and the car feels/sounds better!
Thanks.
Joined: Jul 2002
Posts: 7,301
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From: District of Columbia
I'll let the pic speak for itself make of it as you will.
Same timing, same jetting, 8* cooler, 39% more humidity today.
The blue line was the last time I was at Drift office. and the redline is today al the data is in the photo.
here's the problem. I just didn't take out the expansion chamber. I also changed the header. i was using an old rotary Engineering header painted with high heat paint and wrapped. The new header is an ISC header that has been ceramic coated. You can see the ISC header is straighter off the block and makes a better more gradual turn. I think that's where I picked up the extra 4 ft. lbs. of TQ. Plus you can touch the new header it's soo much cooler in the engine bay now. I think the header added the extra power. I think the expansion chamber was acting as an exhaust box in the same way that the 3" magnaflow that replaced it is...
Same timing, same jetting, 8* cooler, 39% more humidity today.
The blue line was the last time I was at Drift office. and the redline is today al the data is in the photo.
here's the problem. I just didn't take out the expansion chamber. I also changed the header. i was using an old rotary Engineering header painted with high heat paint and wrapped. The new header is an ISC header that has been ceramic coated. You can see the ISC header is straighter off the block and makes a better more gradual turn. I think that's where I picked up the extra 4 ft. lbs. of TQ. Plus you can touch the new header it's soo much cooler in the engine bay now. I think the header added the extra power. I think the expansion chamber was acting as an exhaust box in the same way that the 3" magnaflow that replaced it is...
Joined: Jul 2002
Posts: 7,301
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From: District of Columbia
the burp is clearly from the better header. I think the 4" expansion chamber didn't do any better or worse than the 3" muffler that's there now. Actually i like it better w/o the chamber. the flatter TQ curve is much more driveable.
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