[Closed] Borg Warner Efr Series Turbos

[GTScotT]

I know that I have a pair sitting in my garage at home.........

Why arent you using them John? Still have that 6258 lying about too?

[bri73y]

So without dwelling on it too much more what turbochargers were you using and what was overall opinion on the twin configuration? It was a very packed engine bay with it all in there.

Having been through the twins already, retropectively would you have gone a single EFR or would you in future?

I was using -10's, -5's before that.

Packed, hot and hard to work on, especially when you have to replace them.

A few years back I did a comparison between a T04Z and twin -5's and the twins won hands down on response, from that day on I've been a twin guy.

However having said that, these new twin scroll efr's offer a much better result as a single, where response is no longer an issue with a bigger single. I'd love to whack an 8374 on my motor now to do the comparison again as I think it'd probably be close enough in response to now choose a single over twins.

Given what I went through, if I was to do it again I'd probably go a single 8374, just for the cost saving in fabrication and ease of maintenance.

[bri73y]

Why arent you using them John? Still have that 6258 lying about too?

They turned out to be too big for my application. Full boost by about 5700rpm is too late for a circuit car.

They need more cubes to work at their best.

No, moved that on long ago, hopefully to a happy home.

Which I should probably check on to see if all went ok with install etc.

[GTScotT]

Interesting they were too big. Full race seemed to be poor pushing it to me for the 2L for 400whp.

If you compare the -10s to a 2871 from RB to SR i guess this would mean they aren't all that optimal.

Probably a 6758 would be better.

[Lithium]

A few years back I did a comparison between a T04Z and twin -5's and the twins won hands down on response, from that day on I've been a twin guy.

To be fair, comparing a T04Z and twin -5s isn't fair if you're going to draw a conclusion on twins versus single. The -5s are full GT series turbos running the famed NS111 turbines. In contrast the T04Z is right from the start rated to a reasonable amount higher power level than the -5s - go for a pair of twins rated to more power than -5s and you should expect more lag so I'd say the same should apply to comparing a twin setup to a single rated to more power. The T04Z is also basically just an old T-series Garrett turbo that has been gifted with a ball bearing core, the wheel design is hardly cream of the crop.

I had in my head you had something of a nightmare with EFR turbos in the past, is this past history?

[Nee-san]

People generally compare them because they fit into similar power brackets, but you are right in saying it is not real comparison at all.

[Lithium]

I can see that, but its a bit strange as realistically the T04Z is a closer comparison to -10s than -5s.

[GTScotT]

Yeah, I always considered a T04Z to be closer to 500kw than it was 400kw.... -5s are 400kw on a good day are they not?

[bri73y]

To be fair, comparing a T04Z and twin -5s isn't fair if you're going to draw a conclusion on twins versus single. The -5s are full GT series turbos running the famed NS111 turbines. In contrast the T04Z is right from the start rated to a reasonable amount higher power level than the -5s - go for a pair of twins rated to more power than -5s and you should expect more lag so I'd say the same should apply to comparing a twin setup to a single rated to more power. The T04Z is also basically just an old T-series Garrett turbo that has been gifted with a ball bearing core, the wheel design is hardly cream of the crop.

I had in my head you had something of a nightmare with EFR turbos in the past, is this past history?

True, however I've had both -5's and -10's, and when the comparison was done some 5-6 years ago the T04z was the single of choice in my neck of the woods. Obviously there's a lot more choice now, however back then not so.

EFR nightmare - yes, over or not? I'm not so sure. I haven't turned the key since November as I had an unexpected new addition to the family that's put a temporary hold on my car stuff. To be honest he came at a good time as I was getting ready to walk away from my car given the grief it's given me over the last few years. It will be back up and running in a couple of months for WTAC so I'm sure I'll have more to report then.

[Lithium]

Fingers crossed you have a turnaround in luck when you get back into it, there are all sorts of other turbo options out there these days which are matching or bettering the EFRs in dyno comparisons - though there is a lot of hype out there about their response being better than what you can tell on dyno results, will be interesting to hear objective views on it as at the moment they definitely aren't at the top of my list of turbos I'd take a punt on - despite being one of the most interesting, just because of how big the doubt has got.

[BoostdR]

Fingers crossed you have a turnaround in luck when you get back into it, there are all sorts of other turbo options out there these days which are matching or bettering the EFRs in dyno comparisons - though there is a lot of hype out there about their response being better than what you can tell on dyno results, will be interesting to hear objective views on it as at the moment they definitely aren't at the top of my list of turbos I'd take a punt on - despite being one of the most interesting, just because of how big the doubt has got.

What Turbo's do you like over BW EFR Lithium? FP, Comp Turbo?

Matt

[GTScotT]

$10 on FP.

He's even got me believing of late.

[Lithium]

Yep, bearing in mind I have never experienced the EFR turbos myself... like most, but the ball bearing HTA turbos so far have impressed the hell out of me. I know of no one under whelmed by results when they have tried one, too.

[Sayers]

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.

[bri73y]

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.

You won't know until you try unfortunately.....

[Lithium]

For what its worth I've never heard of anyone having a failure with that one... though given how thin on the ground the results are, and BW or suppliers obviously never advertise "You could have problems with this" its hard to say.

Ideally, you shouldn't.

[Sayers]

Thanks for the replies.

What are the main causes of failures that are occurring?

Are they mainly with high boost setups?

[bri73y]

Thanks for the replies.

What are the main causes of failures that are occurring?

Are they mainly with high boost setups?

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.

[Sayers]

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?

[bri73y]

No, it's the exhaust wheel that lets go.