Twin scroll a 2.5 good idea?
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Twin scroll a 2.5 good idea?
Hey folks thinking of upgrading my 2.5 Sti soon. I love the torque of the 2.5 and I was just wondering if fitting a twin scroll would be worth it
Plan would be to run 450 max with a forged engine
I'm just wondering if it's feasible? As I could just bolt of an sc46
Or would a standard position twin scroll garett provide quicker spool on a 2.5?
Cheers
Steve
Plan would be to run 450 max with a forged engine
I'm just wondering if it's feasible? As I could just bolt of an sc46
Or would a standard position twin scroll garett provide quicker spool on a 2.5?
Cheers
Steve
#4
You could have the same spool up as the sc46 etc but on something bigger.
I love to hear of people doing something different, definitely go for it
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Did The Litchfield type 25 have a hybrid twin scroll?
I know St do a twin scroll 500 wonder what it would be like on a 2.5
I know I'd need twin scroll headers and DP
But I'd need these even if I went for a normal turbo upgrade anyway so best just to buy them and see what happens lol
Steve
I know St do a twin scroll 500 wonder what it would be like on a 2.5
I know I'd need twin scroll headers and DP
But I'd need these even if I went for a normal turbo upgrade anyway so best just to buy them and see what happens lol
Steve
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Did The Litchfield type 25 have a hybrid twin scroll?
I know St do a twin scroll 500 wonder what it would be like on a 2.5
I know I'd need twin scroll headers and DP
But I'd need these even if I went for a normal turbo upgrade anyway so best just to buy them and see what happens lol
Steve
I know St do a twin scroll 500 wonder what it would be like on a 2.5
I know I'd need twin scroll headers and DP
But I'd need these even if I went for a normal turbo upgrade anyway so best just to buy them and see what happens lol
Steve
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There was a thread the other day where it was mentioned that twinscolls when launched in high revs that then remain at high revs through the gears doesn't hold boost very well.
Not convinced twinscoll is better just different.
Not convinced twinscoll is better just different.
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Cheers for the info guys was just to see what people's thoughts were on it the idea it's a long way from being done but it's something to think about
I don't know about top end holding well as the last turbo I had on my 03 blob was a 321T
That did tail off towards the higher rpm but was mapped to do that I believe
I'm sure if the twinscroll was mapped to not tail off I'm sure it could achieve the same?
Thanks
Steve
I don't know about top end holding well as the last turbo I had on my 03 blob was a 321T
That did tail off towards the higher rpm but was mapped to do that I believe
I'm sure if the twinscroll was mapped to not tail off I'm sure it could achieve the same?
Thanks
Steve
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Cheers for the info guys was just to see what people's thoughts were on it the idea it's a long way from being done but it's something to think about
I don't know about top end holding well as the last turbo I had on my 03 blob was a 321T
That did tail off towards the higher rpm but was mapped to do that I believe
I'm sure if the twinscroll was mapped to not tail off I'm sure it could achieve the same?
Thanks
Steve
I don't know about top end holding well as the last turbo I had on my 03 blob was a 321T
That did tail off towards the higher rpm but was mapped to do that I believe
I'm sure if the twinscroll was mapped to not tail off I'm sure it could achieve the same?
Thanks
Steve
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Pretty sure Tim from JTi runs a 2.5 twinscroll with good results and over 500bhp
http://bbs.22b.com/forums/showthread...tchfield-LM480
http://bbs.22b.com/forums/showthread...tchfield-LM480
Last edited by banny sti; 15 July 2014 at 12:10 PM.
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I have gone even further steve in the interests of something that hasn't been done yet my SC42/46 twin scroll has been clocked and rotated on my spec-c engine 2ltr classic not 2.5 tho haven't run it yet hopefully in the next month once my syvecs is fitted and the cars mapped will be interesting to see what the results are.
I had on my last spec-c the type 25 hybrid twin scroll they have come on a long way from those days I would say go for it as the old saying goes you will never know until you try it
I had on my last spec-c the type 25 hybrid twin scroll they have come on a long way from those days I would say go for it as the old saying goes you will never know until you try it
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I have gone even further steve in the interests of something that hasn't been done yet my SC42/46 twin scroll has been clocked and rotated on my spec-c engine 2ltr classic not 2.5 tho
haven't run it yet hopefully in the next month once my syvecs is fitted and the cars mapped will be interesting to see what the results are.
I had on my last spec-c the type 25 hybrid twin scroll they have come on a long way from those days I would say go for it as the old saying goes you will never know until you try it
haven't run it yet hopefully in the next month once my syvecs is fitted and the cars mapped will be interesting to see what the results are.
I had on my last spec-c the type 25 hybrid twin scroll they have come on a long way from those days I would say go for it as the old saying goes you will never know until you try it
Joe
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comparing 2.0 with 2.5 is pretty pointless, they have very different capabilities and reactions on different turbo's.
Here the graphs from mine, forged 2.5, sti inlet manifold, perrin intake pipe and wing mounted ind kit with the new sc46+ turbo. Still on standard management and limited boost due to heat issues of top mount. Was still runing standard wrx headers as well so even more to come lol
anyone got better spool than that? lol
Here the graphs from mine, forged 2.5, sti inlet manifold, perrin intake pipe and wing mounted ind kit with the new sc46+ turbo. Still on standard management and limited boost due to heat issues of top mount. Was still runing standard wrx headers as well so even more to come lol
anyone got better spool than that? lol
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Not very good at reading printouts but am I right to think that the top pic is the boost going up straight away then holding all the way. If so it deserves thisand maybe this
#20
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haha yeah thats the boost profile. On road spool is even better, but that's the same for all cars and just a trait of the dynos.
sold it before ever managed to find out what it would do pushed further, plan would have been front mount, headers, syvecs and see what she did.
sold it before ever managed to find out what it would do pushed further, plan would have been front mount, headers, syvecs and see what she did.
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[QUOTE=Tidgy;11470170]comparing 2.0 with 2.5 is pretty pointless, they have very different capabilities and reactions on different turbo's.
I agree with you on that Tidgy horses for courses tho it depends what you are wanting to use the car for.
As for my old Hawkeye spec-c RA on 650 injectors running the hybrid twin scroll gave me 415/398 peak 1.6 bar flatlining at 1.5 bar right through
I agree with you on that Tidgy horses for courses tho it depends what you are wanting to use the car for.
As for my old Hawkeye spec-c RA on 650 injectors running the hybrid twin scroll gave me 415/398 peak 1.6 bar flatlining at 1.5 bar right through
Last edited by gussy; 16 July 2014 at 06:09 PM.
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Thanks Joe its been a long build seeing as I originally gave myself 365 days to do it it gave me too much time to check on other peoples builds then changing mine again and again will be finished in the next couple of months promise
#23
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[quote=gussy;11470378]
biggest thing with those figures are a 2.5 would be 430-450ftlb at that sort of bhp. for road and occasional track then can't beat the low down grunt of the 2.5, but the 2.5 be pushed as hard as a 2.0
So as you say very much dependant on what your planned use is
comparing 2.0 with 2.5 is pretty pointless, they have very different capabilities and reactions on different turbo's.
I agree with you on that Tidgy horses for courses tho it depends what you are wanting to use the car for.
As for my old Hawkeye spec-c RA on 650 injectors running the hybrid twin scroll gave me 415/398 peak 1.6 bar flatlining at 1.5 bar right through
I agree with you on that Tidgy horses for courses tho it depends what you are wanting to use the car for.
As for my old Hawkeye spec-c RA on 650 injectors running the hybrid twin scroll gave me 415/398 peak 1.6 bar flatlining at 1.5 bar right through
So as you say very much dependant on what your planned use is
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