2.8T any hard evidence that a DP increases performance? - SaabCentral Forums
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9-3 Sedan, Cabrio ('04+)/Combi & 9-3X Performance Mods & Tuning - ALL ENGINES Covers GENERAL Tuning & Performance modifications that are *non-engine specific* in nature

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  #1  
Old 6th September 2011
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Default 2.8T any hard evidence that a DP increases performance?

Any before and after dynos of a DP install everything else being equal?
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  #2  
Old 6th September 2011
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I;d be curious to see this too. You likely wouldn't see hard number increases, but an actual dyno graph would show the benefit.

All a DP does is decrease the level of backpressure that hinders the turbo's spooling ability. It likely wouldn't produce higher numbers by itself, but you should be able to see the turbo reach its programmed boost output at a slightly lower RPM than stock.

That said...

The 2.8T turbo is pretty small, so the spool benefit from a DP might be negligible.
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  #3  
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Ya your right. Before and after dynos are a must. I think if I go with a 19T this DP would be benefical. Haven't decided what to do yet.
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Old 6th September 2011
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On my Toyota Supra, i have gain 23 whp just with a downpipe.
Also, the downpipe help A LOT in decreasing the temperature under the hood. Before the downpipe, my turbo was glow red, after nothing.
I have had over 20 turbo car and a free downpipe have always give me good result. In the next week, i will make 1 for my Aero.
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Old 6th September 2011
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Quote:
Originally Posted by hrc630 View Post
On my Toyota Supra, i have gain 23 whp just with a downpipe.
Also, the downpipe help A LOT in decreasing the temperature under the hood. Before the downpipe, my turbo was glow red, after nothing.
I have had over 20 turbo car and a free downpipe have always give me good result. In the next week, i will make 1 for my Aero.
Are you going to do a before and after dyno?
You know a shop in Quebec that can make this DP? You know of any good exhaust shops near MTL?
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  #6  
Old 6th September 2011
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Quote:
Originally Posted by Wagon View Post
Are you going to do a before and after dyno?
You know a shop in Quebec that can make this DP? You know of any good exhaust shops near MTL?
I dont know for the dyno. If i have time yes.

For the downpipe, as soon as i have time, i will make it by myself.
I have some 3" stainless piping in the garage and my freinds can make me the flange.

Also, if i dont have time, i have a friends that work in a performance garage an he can make me a full exhaust for under $1000. In the past he have made some crazy exhaust project for me.

Last edited by hrc630; 6th September 2011 at 10:44 PM.
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  #7  
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Quote:
Originally Posted by hrc630 View Post
I dont know for the dyno. If i have time yes.

For the downpipe, as soon as i have time, i will make it by myself.
I have some 3" stainless piping in the garage and my freinds can make me the flange.

Also, if i dont have time, i have a friends that work in a performance garage an he can make me a full exhaust for under $1000. In the past he have made some crazy exhaust project for me.
Do you know any good exhaust shops in or near MTL?
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Old 7th September 2011
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Quote:
Originally Posted by Wagon View Post
Do you know any good exhaust shops in or near MTL?
One member on here gained 11hp and like 4 tq all on the top end on his turbo x. Look up "turbo x downpipe thread" the sheets and video should be there
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  #9  
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Quote:
Originally Posted by Titansaab27 View Post
One member on here gained 11hp and like 4 tq all on the top end on his turbo x. Look up "turbo x downpipe thread" the sheets and video should be there

If you find the thread please post it up. I will see if I can find it. Did he have a tune or any other mods? Did he lose low or mid?
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Old 7th September 2011
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It was me, will post up info stand by
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Stock 2.8l V6 Turbo with K&N Filter


Dynos:


Before





After

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Those are really solid numbers, especially from a Dyno Dynamics test.

Were both SAE corrected, or uncorrected?

(Trying to see whether a ~5 percent gain was affected by ambient temps....)
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yes they were!
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  #14  
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Did you lose low end tq?
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  #15  
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Quote:
Originally Posted by Wagon View Post
Did you lose low end tq?
Dyno Pics above
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  #16  
Old 7th September 2011
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Quote:
Originally Posted by kanundrum View Post
Dyno Pics above
Yes I see them. It looks like you are losing low end tq (the line is blurry). Is this the case and how much is the loss?
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Quote:
Originally Posted by Wagon View Post
Yes I see them. It looks like you are losing low end tq (the line is blurry). Is this the case and how much is the loss?
There is no loss ?

Look at the lines Red Line is the New Line

Green Line is the old one, compare the figures at 2450 and 2900rpm's
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Old 7th September 2011
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there is a gain all across the board which equals fantastic!
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  #19  
Old 7th September 2011
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Quote:
Originally Posted by kanundrum View Post
There is no loss ?

Look at the lines Red Line is the New Line

Green Line is the old one, compare the figures at 2450 and 2900rpm's
Very hard to see on my small screen laptop. So the answer is no there is no lose in low end tq?
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  #20  
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Will dyno with Vtune in a few weeks (with all brand new coils and sparks) and Correct no loss
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