Cragrat

iTrader: (4)

evening folks,just started removal of my 3dr yb for rebuild and it has occurred to me the current 297bhp on a t3 is only gonna be improved on by about 40 bhp at best with my t34 .48 i got this year even after i have it rebuilt,now am i better off just going straight to a gt30 and sell the t34 as it is

opinions please or any other options

RickyLee53

A GT30 IMO is better than a T34 in every way.

That said, its a lot more expensive and if for some reason you break it not cheap to rebuild. I know what i'd buy, but it depends what you want from the car.

fuzzy

is it true you also need external wastegates on gt series turbos?

KSA-Cossie

iTrader: (4)

What power you after and how do you want it ?

olek

a couple of mates runs gt3071 and gt2871 and they seem very good, despite they're not properly set up yet.

remember that the t34 is 15-20 years(?) old now.

Cragrat

iTrader: (4)

ultimately after around 400bhp,got some greys to replace 803`s and all the stage 3 stuff already

would like more like 450-470 but gotta be realistic,i think thats when things start to break in the drivetrain

oh yeah anyone know if its worth fitting a 15mm plenumn spacer and where to get one for my 4x4 manifold

cheeRS daz

KSA-Cossie

iTrader: (4)

GT3071 then m8.

Cragrat

iTrader: (4)

whats the advantage over a gt30 ?

Captain500rs

From what ave seen on here, you can get internally gated aswell as external ones fella

olek

no problem getting these turbos as internally gate'd.

Cragrat: the gt3071 is in the gt30-"family".

Cragrat

iTrader: (4)

oh right so gt30 is just a vague description then,i need to be more precise in my spec?

does the same apply regards the internal wastegate as t34 .48 .55 etc sizewise with regards to lag or is there just one size?

andy escos

iTrader: (1)

ferriday engineering 4 plenum spacer

olek

that's right.

Jay,

iTrader: (4)

a gt30.71 will spool as quick as a t34.55 and hold the boost better and make more power , see cossierich resto thread

Miller 3

iTrader: (4)

basically the smaller the number the quicker it will spool the bigger the number the more power/lag it will produce

Cragrat

iTrader: (4)

so what are my options regards wastegate size?

will be road use mainly with 1/4 mile fun,its a second car,wife hates going in it and darent drive it

Miller 3

iTrader: (4)

well as you only want circa 450 i would go gt30.71 internal set up

have a read of cossierich's resto https://passionford.com/forum/restorations-rebuilds-and-projects/245822-my-2wd-sapphire-cosworth-full-spec-rolling-road-graph-pics-update-2-7-09-a.html

Cragrat

iTrader: (4)

just done it,few ups n downs eh! nice motor he`s ended up with


looks like phone call to martin hadland soon,anyone wanna buy a t34.48 hes a little sideways play so could do with rebuild

Miller 3

iTrader: (4)

side to side dont matter too much its in ond out you dont want... martoon will sort you out buddy

Jay,

iTrader: (4)

chip supplied richies turbo

Cragrat

iTrader: (4)

was gonna get it done to be on the safe side

Cragrat

iTrader: (4)

what Ł? i looking at for one,ie complete,can i still use my -31 or is it a different set up on them?

Miller 3

iTrader: (4)

thay are around 850 from martoon, im sure he can get you a .71' best to give him a bell. failing that Chip had one for sale a while back, not sure if it got sold tho.

Cragrat

iTrader: (4)

chip sold it

cheeRS folks will start saving