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

 

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.

 

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

 

What power you after and how do you want it ?

 

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.

 

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

 

GT3071 then m8.

 

whats the advantage over a gt30 ?

 

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

 

no problem getting these turbos as internally gate'd.

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

 

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?

 

ferriday engineering 4 plenum spacer

 

that's right.

 

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

 

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

 

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

 

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

 

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

 

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

 

chip supplied richies turbo

 

was gonna get it done to be on the safe side

 

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

 

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.

 

chip sold it

cheeRS folks will start saving