[[Closed] Borg Warner Efr Series Turbos]

Still looking good.

Turbine housing and exhaust manifold have both been ceramic coated, flange surfaces on the inlet manifold have been machined (3 of 4 were out of tolerance apparently), oil drain will be rectified next time I have a day off. Then I'll slap it back together, and it get back on the dyno, hopefully, with the mystery air leak sorted out.

That looks real clean. Who did the coating and what did it cost for the housing?

[[Closed] Borg Warner Efr Series Turbos]

Tha coating looks great. I'll do that on mine for sure.

I'm just REALLY frustrated about which one to get. "over-revving" these turbos seems to be a big no-no which sux because a 6258 looks ideal for awesome response on a 2.15L SR20 but even though I'm happy to run it down to 60% efficiency up near rev limiter, it's going beyond the "recommended" RPM. Not interested in th 6758 at all. It's compressor map looks horrible and the 7064's inducer is smaller anyway.

I just wish turbos were more customisable. I think the 70mm compressor model should also be offered with a 61mm turbine for smaller engines and a T3 divided .82 housing as well to fill the gap between the T25 .64 and the T4 divided .92/T3 .82 (both spool about the same).

What are the RPM limits on the EFR's?

[[Closed] Borg Warner Efr Series Turbos]

No, I had one let go at around 14psi after 5mins on a dyno.

It's a casting issue, it'll just happen no matter what,...........if it's going to.

You may be worrying for nothing at this point.

Casting issue with the TI wheel?

[[Closed] Borg Warner Efr Series Turbos]

Thanks for the replies.

What are the main causes of failures that are occurring?

Are they mainly with high boost setups?

[[Closed] Borg Warner Efr Series Turbos]

Hi guys,

Hoping I can get some advice or be pointed in the right direction.

I have a EFR 6758, PN-179388, SN-APA347100009. I'd like to confirm if I have a unit that I'm going to have issues with?

Thanks in advance.