turbo exhaust
turbo exhaust
now before you all start freaking, i did just search for this issue and found little help
who here is running a 3" exhaust on turbo?
my exhaust shop was showing me thier raw 3" piping and the damn thing was HUGE
im running a t3 w/ stock internals, what would you recommend 2.5 or 3" from downpipe through?
who here is running a 3" exhaust on turbo?
my exhaust shop was showing me thier raw 3" piping and the damn thing was HUGE
im running a t3 w/ stock internals, what would you recommend 2.5 or 3" from downpipe through?
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From: Harker heights Tx
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3" is a hell of alot of piping.. but I have the TSI extreme kit with no cat and the greddy evo2 exhaust now and I can tell you it does make a difference due to pipe size for instance the tone of the exhaust got deeper and the turbo spools even faster now
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Originally Posted by Alex1
But don't you get quicker spool time and make a bit more power with 3" piping?
The power difference if any will be 5-15whp. IF THAT at same boost levels and all. You will loose TQ as a result. The 3" will just merely reallocate the power to the upper RPMS where exhaust gases pulses are greater. You will sacrifice low end and mid range as a result.
DONT PANIC
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From: California, Palmdale
Rep Power: 285 "the best turbo exhaust is no exhaust" --Corky Bell
That means that the bigger, the better.
If you are running a stock motor, 2.5" will be more than enough. Going with a 3" will not yield you a large gain. It will just be more expensive and louder.
I went 13.6 @ 102 on 2.5" exhaust and a 2.5" downpipe. I ran the same time with a 3" downpipe and no exhaust. Both stock motors.
That means that the bigger, the better.
If you are running a stock motor, 2.5" will be more than enough. Going with a 3" will not yield you a large gain. It will just be more expensive and louder.
I went 13.6 @ 102 on 2.5" exhaust and a 2.5" downpipe. I ran the same time with a 3" downpipe and no exhaust. Both stock motors.
DONT PANIC
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Rep Power: 285 if it will benefit you, yes.
We found that on an SRT4, we gained more than 40 whp when we swapped from a 3" to a 4" exhaust.
The SRT was not stock. It made 550 whp on the turbo alone, and had a 100 shot of nitrous on top of it. Had a different comp. ratio than stock (higher, but wont go into details), and it ran a lot of boost (again, wont go into it)
Basically what im saying is:
if you have a need for it, then get it. If you will eventually have a need for it, then get it, it wont hurt you.
We found that on an SRT4, we gained more than 40 whp when we swapped from a 3" to a 4" exhaust.
The SRT was not stock. It made 550 whp on the turbo alone, and had a 100 shot of nitrous on top of it. Had a different comp. ratio than stock (higher, but wont go into details), and it ran a lot of boost (again, wont go into it)
Basically what im saying is:
if you have a need for it, then get it. If you will eventually have a need for it, then get it, it wont hurt you.
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Originally Posted by turboengnr
"the best turbo exhaust is no exhaust" --Corky Bell
That means that the bigger
If you are running a stock motor, 2.5" will be more than enough. Going with a 3" will not yield you a large gain. It will just be more expensive and louder.
I went 13.6 @ 102 on 2.5" exhaust and a 2.5" downpipe. I ran the same time with a 3" downpipe and no exhaust. Both stock motors.
That means that the bigger
If you are running a stock motor, 2.5" will be more than enough. Going with a 3" will not yield you a large gain. It will just be more expensive and louder.
I went 13.6 @ 102 on 2.5" exhaust and a 2.5" downpipe. I ran the same time with a 3" downpipe and no exhaust. Both stock motors.
However, Corky did have an entire chapter on exhaust systems in his infamous bible. On the 2nd or 3rd page of the chapter, he has a very nice graph with a correlation of how much of a diameter exhaust you should have with respect to engine power. 3" will work majic up to and more than 700hp.
Found it..........Chapter 11, page 133 has the graph
On the preceeding page, 132, I quote:
Originally Posted by Corky Bell
It is easy to get overeager on fitting large-diameter pipes into an exhaust system. "The larger the better" is not the case. As indicated in Chapter 5, there is an exhaust gas velocity that ought not to be exceeded. I am going to suggest that for exhaust calculations, this is approximately 250ft/sec...
Last edited by dezod; Aug 23, 2005 at 08:57 PM.
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Rep Power: 0 Ok, so you can use pretty much any 2.5" aftermarket exhaust and it shouldn't affect Hp and Tq on a basic setup??? I'm getting a turbo kit soon, but I want to use an exhaust that is still not very loud and noticable..I know the more "quite" exhaust systme my restrict flow, but would it really make that much of a difference?
thanks for the opinions
i think im gonna do a 2.5 downpipe back w/ high flow cat
hopfully be put in next week with the turbo, but im still awaiting my oil lines in the mail
i'll take some pics
i think im gonna do a 2.5 downpipe back w/ high flow cat
hopfully be put in next week with the turbo, but im still awaiting my oil lines in the mail
i'll take some pics
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Rep Power: 285 im simply stating the gains that we achieved with the mods we used.
I quoted him out of simplicity. For the most part, its true. I ran a completely open 3" downpipe that was ~12" long. Then i ran my full 2.5" exhaust. I had a negligable gain on the dyno. But its a gain, none the less.
I did the calculations. But when tested the open downpipe was the best (for my car). Everyone elses cars may be different. No 2 cars are the same. Thats why some (completely bone stock) SRT4's make 215 whp, and others make 235 whp on the same boost. Thats why some Hondas make 90 whp, and others make 100. Yet they all have the same parts.
I quoted him out of simplicity. For the most part, its true. I ran a completely open 3" downpipe that was ~12" long. Then i ran my full 2.5" exhaust. I had a negligable gain on the dyno. But its a gain, none the less.
I did the calculations. But when tested the open downpipe was the best (for my car). Everyone elses cars may be different. No 2 cars are the same. Thats why some (completely bone stock) SRT4's make 215 whp, and others make 235 whp on the same boost. Thats why some Hondas make 90 whp, and others make 100. Yet they all have the same parts.
Originally Posted by eye_see_you
3" is a hell of alot of piping.. but I have the TSI extreme kit with no cat and the greddy evo2 exhaust now and I can tell you it does make a difference due to pipe size for instance the tone of the exhaust got deeper and the turbo spools even faster now
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