420-450 bhp what turbo and engine Spec
08-02-2008, 08:51 PM
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420-450 bhp what turbo and engine Spec
My buddy Steve has decided he wants to up his power on the cossie.
He asked me what the best spec for a really nice driveable 420-450bhp
He dont want anything too laggy so possibly a GT series Turbo
Also wants to know peoples thought on compression ratios, head mods, headgaskets that are up to the job, e.t.c.
He still wants a good driveable car, hes engine build starts in 2 weeks,
All i have told him was choose the power you want and choose the smallest turbo you can get away with to get there
He asked me what the best spec for a really nice driveable 420-450bhp
He dont want anything too laggy so possibly a GT series Turbo
Also wants to know peoples thought on compression ratios, head mods, headgaskets that are up to the job, e.t.c.
He still wants a good driveable car, hes engine build starts in 2 weeks,
All i have told him was choose the power you want and choose the smallest turbo you can get away with to get there
08-02-2008, 09:01 PM
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t4 turbo isnt as bad as people make out and it can do more power then he wants i have one for sale 900 and its like new done 800miles new core shaft bearing the lot its the real version ar70 front 2 pice back housing
08-02-2008, 09:06 PM
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My 247 Maram Shaft T4 may be for sale within that time. Will do 450 all day long and with anti-lag obviously there is no lag.
In fact the whole engine will probably for sale very soon.
both low mileage
In fact the whole engine will probably for sale very soon.
both low mileage
08-02-2008, 09:07 PM
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Originally Posted by cossie4i
What about a nice new TT T38 
Steve.
Steve.
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10-02-2008, 08:56 AM
#13
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Originally Posted by abdr500
Jasesapphy
who siad ther laggy ther not that bad then i do have a tubular manifold that helps
who siad ther laggy ther not that bad then i do have a tubular manifold that helps
10-02-2008, 09:09 AM
#14
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I would talk to Darren at Damico about a De Shroud on the inlets about Ł275, then a T34.48 with group a YB 0611 headgasket, chip to suit either greys or siemens.
The T34.48 will do 400 all day long, but 450 would really be better with a T38.55 I would say.
The head mods really bring it alive low down, in town trundling along at 15/20 I am in 3/4 gear and VERY responsive accelration at this speed, I am running a T34.48, and get 150lbft@1500rpm 330lbft@2300rpm and it holds 330lbft past 6000rpm, it does NOT drop off at all, due to the very small amount of headwork.
Damico 01953 717784.
tabetha
The T34.48 will do 400 all day long, but 450 would really be better with a T38.55 I would say.
The head mods really bring it alive low down, in town trundling along at 15/20 I am in 3/4 gear and VERY responsive accelration at this speed, I am running a T34.48, and get 150lbft@1500rpm 330lbft@2300rpm and it holds 330lbft past 6000rpm, it does NOT drop off at all, due to the very small amount of headwork.
Damico 01953 717784.
tabetha
10-02-2008, 09:13 AM
#15
Originally Posted by tabetha
I would talk to Darren at Damico about a De Shroud on the inlets about Ł275, then a T34.48 with group a YB 0611 headgasket, chip to suit either greys or siemens.
The T34.48 will do 400 all day long, but 450 would really be better with a T38.55 I would say.
The head mods really bring it alive low down, in town trundling along at 15/20 I am in 3/4 gear and VERY responsive accelration at this speed, I am running a T34.48, and get 150lbft@1500rpm 330lbft@2300rpm and it holds 330lbft past 6000rpm, it does NOT drop off at all, due to the very small amount of headwork.
Damico 01953 717784.
tabetha
The T34.48 will do 400 all day long, but 450 would really be better with a T38.55 I would say.
The head mods really bring it alive low down, in town trundling along at 15/20 I am in 3/4 gear and VERY responsive accelration at this speed, I am running a T34.48, and get 150lbft@1500rpm 330lbft@2300rpm and it holds 330lbft past 6000rpm, it does NOT drop off at all, due to the very small amount of headwork.
Damico 01953 717784.
tabetha
10-02-2008, 09:15 AM
#16
Originally Posted by tabetha
I would talk to Darren at Damico about a De Shroud on the inlets about Ł275, then a T34.48 with group a YB 0611 headgasket, chip to suit either greys or siemens.
The T34.48 will do 400 all day long, but 450 would really be better with a T38.55 I would say.
The head mods really bring it alive low down, in town trundling along at 15/20 I am in 3/4 gear and VERY responsive accelration at this speed, I am running a T34.48, and get 150lbft@1500rpm 330lbft@2300rpm and it holds 330lbft past 6000rpm, it does NOT drop off at all, due to the very small amount of headwork.
Damico 01953 717784.
tabetha
The T34.48 will do 400 all day long, but 450 would really be better with a T38.55 I would say.
The head mods really bring it alive low down, in town trundling along at 15/20 I am in 3/4 gear and VERY responsive accelration at this speed, I am running a T34.48, and get 150lbft@1500rpm 330lbft@2300rpm and it holds 330lbft past 6000rpm, it does NOT drop off at all, due to the very small amount of headwork.
Damico 01953 717784.
tabetha
10-02-2008, 09:45 AM
#22
saff is working!!!...atm
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engine spec = whatever takes ur fancy cos someone will allways say different...........turbo = i'm using a ut t38..............my next stage is head work,cam,injectors and a re-map................this should/will see a good 450bhp,not sure on the ft/lbs this will give though, as it's a pretty smooth turbo.............
10-02-2008, 09:47 AM
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For a really nice 420 bhp, I would suggest a 3.6l flat boxer engine twin turboed, and preferably hanging over the back wheels.
I would suggest a 4x4 transmission also!
JJ
I would suggest a 4x4 transmission also!
JJ
10-02-2008, 11:02 AM
#25
Originally Posted by JjCoDeX75
For a really nice 420 bhp, I would suggest a 3.6l flat boxer engine twin turboed, and preferably hanging over the back wheels.
I would suggest a 4x4 transmission also!
JJ
I would suggest a 4x4 transmission also!
JJ
Steve.
10-02-2008, 04:02 PM
#27
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Sorry Steve, but on this we absolutely disagree!
JJ
But it don't give the same buzz as a cossie
Steve.
JJ
Originally Posted by cossie4i
Originally Posted by JjCoDeX75
For a really nice 420 bhp, I would suggest a 3.6l flat boxer engine twin turboed, and preferably hanging over the back wheels.
I would suggest a 4x4 transmission also!
JJ
I would suggest a 4x4 transmission also!
JJ
Steve.
10-02-2008, 04:13 PM
#28
DEYTUKURJERBS
Thats some funny ass GT28RS people have if they think it will even get 400, never mind 450
Id say something like a GT3071R at mega boost, 2.5bar (thats still on the compressor map on that turbo) or summat (for maximum torque and so you dont need a too big turbo, like T4), as high comp as you can get away with at that sorta boost (8:1? 7.5? TBH it dont make much odds in reality), lowest duration cams you can get away with (standard? i dunno), mildly ported head, not big ports, just make it all better, etc etc.
Basically keep everything as small and as big boost as possible for the power you want, for maximum torque and response.
Id say something like a GT3071R at mega boost, 2.5bar (thats still on the compressor map on that turbo) or summat (for maximum torque and so you dont need a too big turbo, like T4), as high comp as you can get away with at that sorta boost (8:1? 7.5? TBH it dont make much odds in reality), lowest duration cams you can get away with (standard? i dunno), mildly ported head, not big ports, just make it all better, etc etc.
Basically keep everything as small and as big boost as possible for the power you want, for maximum torque and response.
10-02-2008, 05:38 PM
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Originally Posted by tabetha
A T34.48 has done as good as 400bhp(397.6) on regular(Vpower) fuel, with the same modded head as mine, by the same person who did my head.
tabetha
tabetha
10-02-2008, 08:37 PM
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Tabetha...your talk sense on one hand then bollocks on the other 
Sorry but a .48 can not get a genuine 400bhp on pump fuel unless the result is from a rolling road in 3rd gear and set to bullshit figure to impress you mode.
...if you think a .48 keeps revving you aint been in a cossie with either a bigger exhaust housing or a bigger turbo then!
Sorry but a .48 can not get a genuine 400bhp on pump fuel unless the result is from a rolling road in 3rd gear and set to bullshit figure to impress you mode....if you think a .48 keeps revving you aint been in a cossie with either a bigger exhaust housing or a bigger turbo then!
10-02-2008, 08:38 PM
#37