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

 

ported head, nothing to major, standard compression, GT28 or 30 turbo & live map.

 

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

 

What about a nice new TT T38

Steve.

 

T4

I said responsive and not laggy

 

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

 

Vince has done one these with a roller bearing core, and apparently the guy is very impressed with it

 

Jasesapphy
who siad ther laggy ther not that bad then i do have a tubular manifold that helps

 

so would we be looking at a GT28RS for that power

 

a big gt28rs will do just over 400 but spool up like a t34.48

 

So what turbo for 430, thought a GT30 was for 450bhp plus

 

depends on the size jase really but i should imagine martins internally gated gt30 will be a good turbo for 450bhp and with room left for over kill

 

I do lad, been there done that Turbos have move on, prob is many Tuners cant stop the new ones surging & hence put up with the older more laggy T4.

 

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

 

you are jokeing right t34.48 will do 400 bhpnot in the this day and age for one u cant physicaly run the ignition on todays fuel

 

 

you wouldnt know about that

 

well when did urs surge last ?

 

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.............

 

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

 

well standazrd engine can see around 400-420..

so get a suitasble chip..black injectors..and right clutch..

turbo wise i wouldnt know.

 

But it don't give the same buzz as a cossie

Steve.

 

Roller bearing T4, 83lbs, Ported head, 4"" exhaust.

 

Sorry Steve, but on this we absolutely disagree!

JJ

 

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.

 

thats a small 28 tho

 

The words "GT28RS" was used, and there only 1 type of RS...

 

no one from MAD knows what surge feels like, as Mark's engines dont do it

 

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

 

Engine advantages?

 

I would say a gt.30 on a 2wd manifold, bd-12 intake cam and maybe a sweedish inlet, then your on the way

 

 

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!

 

Fucking T34.48 PMSL

Mid 300s game over

I cant reach 400bhp on a .55 and a .63 is not exactly pissing it, a .48 dont stand a chance

 

jase you wont do it on a 63 unless u ram loads of boost through it and it WILL DIE

 

Paul hills to the rescue!

 

400 bhp on a .63 iv seen loads of time peaking 2.1, holding 1.9 / 2 bar.

Seen about 5 or 6 hit 400 - 409