Borgwarner efr 6258

[MaxCos]

Anyone used this as an t34 alternative?
Would it be a straigth fit on an t25 exhaust manifold?

Thanks,
Karl

[cossyking]

No but it will be loads better my 70/64 responds like a t3

[MaxCos]

No but it will be loads better my 70/64 responds like a t3

does sound good

Looking for an replacement for the t34 but with better response.
Are the built in dump valves good to use?

Thanks,
Karl

[cossyking]

Yes they work fine mate awesome turbo range

[jsa]

Would it be a straigth fit on an t25 exhaust manifold?

Thanks,
Karl

The ST & BT manifold both use T3 bolt pattern. The efr housings i've looked at are T25 or T4 bolt pattern or vband.

[MaxCos]

ST is on T25 flange, BT on T3.

[MaxCos]

Just found this on the web, so should clear on an std. Manifold

[jsa]

ST Turbo/Manifold 86mm AKA T3 bolt pattern



BT Manifold 86mm AKA T3 bolt pattern



6258 T2 flange 73mm
http://www.full-race.com/store/image...content-13.jpg

[72mach1]

I have used the 6758 for a while, but in a rwd sierra. Only made 4 new stud holes in the t25 manifold and there where no clearance issues on a 4x4 head. Had 1,9 bar boost by 3200-3300 so i think the 6258 will be mental. Had no chance att all to get traction in 3rd with new 215/40-17"

[oddkidd]

I have machined the manifold on a st to fit either style exhaust housing. Ill find some pics

[Fizziani]

hold the bus! what are we talking about here!?!?!

A borg warner twinscroll turbo in t3 size that can be fit to a stock small turbo manifold?!?! Please let this be true.. whats the power potential!?

Fizz

[MaxCos]

Twin scroll is with t4 flange on 0.80 ex. housing.

I'll wait until Mark has tested one on an YB, but i think i'll go to efr 6758.
I've seen some dynosheet's - they are spooling nearly the same, but 6758 was way better on top end.

[72mach1]

Would go for 6258 or 7064. 6758 started to surge at 1,9 bar during spoolup and around 4100-4300. Not so you could see it or feel it,but you could hear it.Have now a 7064 with twin scroll housing and in 4 gear you can have as much boost as you want by 3600-3700 and no surge

[cossiejim]

Would go for 6258 or 7064. 6758 started to surge at 1,9 bar during spoolup and around 4100-4300. Not so you could see it or feel it,but you could hear it.Have now a 7064 with twin scroll housing and in 4 gear you can have as much boost as you want by 3600-3700 and no surge

on what manifold? ,any pics of your setup


cheers james

[72mach1]

It's on a 2wd manifold, only needed to cut of the t3 flange,widen up the last section to t4 size and weld on a t4 flange don't got any pics here,but shall see if I can find some