Is 4.5" downpipe enough for 1000Hp (TC78)?
Is 4.5" downpipe enough for 1000Hp (TC78)? My DP will be coming out of bumper, so only 3ft long... Is 4.5" diameter fine for that power level? I mean, will it allow to squeeze every bit out of TC78?
Actually while reading I decided for now to stay with conventional exhaust (all the way to the rear). I plan to expand from 3" to 3.5" right from the turbo, go all the way to the tranny cross-member and then go into existing 3" Flowmaster pipe and muffler. Does it sound like a good plan? I hope that will provide good enough spool on the street and enough power for now to go 11.5s - any faster and we have to get cage here, and I don't want to do this
Launching!
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From: Laramie, Wyoming - 7220' elevation
Actually while reading I decided for now to stay with conventional exhaust (all the way to the rear). I plan to expand from 3" to 3.5" right from the turbo, go all the way to the tranny cross-member and then go into existing 3" Flowmaster pipe and muffler. Does it sound like a good plan? I hope that will provide good enough spool on the street and enough power for now to go 11.5s - any faster and we have to get cage here, and I don't want to do this
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Verdad Gallardo Heard opinion that stepping up 3->3.5" and then back 3.5->3" is not a good idea, but I can't agree with that considering all the bends that will be there before pipe will reach tranny crossmember...
Grr, that's what I have now, and it will stay for now...
Grr, that's what I have now, and it will stay for now...
Also I really would like to rejoin wastegate pipe into main pipe. Otherwise I won't hear what is going on in the engine when WG will be screaming on boost. But it looks so damn hard to do that... Should I still rejoin it to main exhaust somewhere, or just relax and dump it and not to try to listen to engine?
I dont understand what you are saying about "listening to the engine". It's not like an open cutout. It's just the cool whooshing sound that turbos make and it's only when you are under boost. Try it open and if you don't like it, tie it in later. The turbo does alot to quiet the exhaust down so a chambered muffler isn't neccesary. I ran mine with just a 2 foot downpipe right off the turbo and it was still quieter than my true dual 3" exhaust with Borla XR1's on my old 408. Now with the 4" magnaflow bullet, it's really quiet unless your on it and I have it exiting before the rear. If you go all the way out the back it would be even quiter.
When WG is dumping exhaust gases, it is just loud as hell. It is when you're on boost when harmful events happen and you should be listening for detonation, not just screamer pipe
And flow through WG is not even going through turbo...
And flow through WG is not even going through turbo...
tie it back in, dumped wastegates are one of the worst sounding things in the automotive world. You can tie it in anywhere space permits, but i suggest using a flex joint of some sort.
