Informative: Exhaust Tuning, what part of the system actually tunes
04-13-10, 11:33 AM
#101
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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...
The rest will be a bit different.
04-15-10, 03:42 PM
#109
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...
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