[Closed] Borg Warner Efr Series Turbos

[black bnr32]

I just got mine and mine is just as bad as the one in the pics including the far off-centre bolt holes. I've been waiting so long that I'm just going to fill in one side on the turbine entry to make it smaller and symmetrical because I'll be blocking the internal gate anyway so may as well block it using a couple of bits of stainless plate to better direct air into the housing.

can you please post some pictures? i`d really like to see the bolt holes. also, can you confirm the model?

Edited November 27, 2012 by black bnr32

[FineLine]

These things have been a joke from the getgo. Cant believe I was eagerly awaiting their arrival.

[bradsm87]

can you please post some pictures? i`d really like to see the bolt holes. also, can you confirm the model?

I won't have time for ages but it lookes exactly the same as the pics posted on that BMW forum. It's a 7064 .92.

[bradsm87]

Got my EFR 7064 .92. Modded for external gate so I can build a super quiet 2.5" exhaust for the turbine gas only. A 2.5" exhast would be too small to flow the turbine gas and wastegated gas. Divided all the way to the wastegate valve.

Edited December 2, 2012 by bradsm87

[scotty nm35]

Nice job on keeping it split to the gate there Brad.

Interested to see how this one goes.

[Full-Race Geoff]

Richard, are 6258s the largest twin you can fit in the engine? Im keen to try a set on my OS rb26/30 time attack r32. I don't mind whether it's internal or external gates but Im keeping with the twin for response.

the EFR 6758 are the larger compressors than EFR 6258 and they are the identical size. if you have a 3L+ engine going hard at high boost then 6758 twins are recommended. All of the Lotus and Chevy Indycars use twin EFR6758's on a v6.

bri73y briefly tried the 7163 as a twin on his 2.6L and it was way too much turbo so he went back to 6258's

' timestamp='1353562703' post='6635922']I think I will be moving up to a 7670 on my new engine as I want to turn it to 9500 and I think the 7064 will struggle to hold 28-30psi at that kind of rpm, even the 7670 might struggle, maybe an 8374 will be on the cards haha....

this thing will go 350 on my new motor. We could get boost on earlier as we havent touched the cams yet but ont he stock motor we dont want to put to much stress on it. New motor will be higher comp and mivec so will come on much sooner.

I agree your 7064 will run out of compressor for a 4G63 at 30psi and 9500rpm - of course it will be great to see what it can do at full tilt on the new motor. Considering your evo already runs an external wastegate twinscroll setup, the 7670 would be my recommendation and a simple swap for your existing 7064. the 8374 requires a bit more work to fit in an evo due to the larger compressor housing. 7163 will not be available with twinscroll external wg

The problem is that the EFR 6758 is quite inefficient compared to the others, especially at low boost. Also the only turbine housing option is the T2 .64 which is too restrictive for my engine.

dont underestimate the 6758 - it packs a lot of punch and very quick response. I spoke with dario franchetti - 4x winner of Indy500 (And he won this year on a twinscroll 9180). he said he wishes he was on the twin 6758 becuase they are faster on the small tracks. There will be a .86 a/r T25 housing coming in july as well as the .80 twinscroll T4 housing

I plan to replace the 7064 with a 7163 with the divided 0.80 housing after a year or so.

im planning on the same exact turbos as you but on my 3.5L V6 F150. i think we can make 600tq on the 7064 and 700tq on the 7163

Got my EFR 7064 .92. Modded for external gate so I can build a super quiet 2.5" exhaust for the turbine gas only. A 2.5" exhast would be too small to flow the turbine gas and wastegated gas. Divided all the way to the wastegate valve.

wow, that is not typical. what did you make the divider plate out of? hopefully 321, otherwise it can fail and possibly damage things

Edited December 4, 2012 by Full-Race Geoff

[Dose Pipe Sutututu]

HI Geoff,

I've been kinda interested in these BW turbos... ideally I want something of a GTX3076R Twin Scroll in T3 but don't want to run external (cost/look wise). I like the idea of BW's twin scroll and internally gated designs.. but it seems they're mainly T4? Clearly too big for my RB25DET...

I've looked around the internet and can't really find anyone running that kind of turbo on a RB25DET but have seen a few on EVOs etc.. Also seems there have been a few delays and stuff as I've read in this thread.

Requirements:

- twin scroll

- T3

- internally gate

- on boost before 4000 rpm

- about 320+ kWs on 98

- a flat-ish torque curve, similar to what the Kando T67-25g 10cm can do

- cheaper than GTX3076R

[bradsm87]

T4 is only the flange size. The T4 .92 housing certainly is not big for an RB25. Sounds like the one for you would be an EFR 7670 with the .92 internal gate housing. of if you want better response, go the 7064.

Edited December 5, 2012 by bradsm87

[Dose Pipe Sutututu]

^ do you know where I can find dyno graphs with those 2x turbso on unopened or mild RB25DETs ?

[Trozzle]

^ do you know where I can find dyno graphs with those 2x turbso on unopened or mild RB25DETs ?

Almost certainly don't exist, lol

[Dose Pipe Sutututu]

Almost certainly don't exist, lol

and after looking at the prices, damn I might as well just get a GTX3076R lol

[bradsm87]

Why? The BorgWarner is better? If they're the same price, then the BW is far better value. U don't need to buy a BOV with the BW either.

[GTScotT]

And probably be better off with a GT3076R regardless.

Pretty sure results have shown the regular GT is better on 98 if anything.

[Dose Pipe Sutututu]

Why? The BorgWarner is better? If they're the same price, then the BW is far better value. U don't need to buy a BOV with the BW either.

I don't really care about the BOV part I never run those things lol...

I'm just more interested in running a twin scroll turbo but without the external gate... keep the engine bay looking more simple. Guess I'll wait it out until I see results, a tad scared to hop on the bandwagon at the moment.

[wolverine]

And probably be better off with a GT3076R regardless.

Pretty sure results have shown the regular GT is better on 98 if anything.

I reckon so.

[Lithium]

The T4 .92 housing certainly is not big for an RB25. Sounds like the one for you would be an EFR 7670 with the .92 internal gate housing. of if you want better response, go the 7064.

Agreed - on the contrary to being too big I think the .92 TS EFR7670 would be an amazing thing on a mild RB25... on pump gas it would certainly make more power than a GT3076R, and response would be ridiculous. I think it would be a match made in heaven tbh.

[Dose Pipe Sutututu]

^ who has tried it? lol.. when I look up these turbos I only see them strapped to EVOs

[bradsm87]

Engines are just air pumps. Air is air. It will perform well on a mild RB25 because a mild RB25 will pump about the same as a stroked 4G63 with mods. It work great on the 4G63. It'll work great on an RB25.

[Dose Pipe Sutututu]

different motors different results... different strokes, different cam duration, different capacities, different spool times, different torque...

just prefer to see results first, keeping my options open at the moment.

[Lithium]

different motors different results... different strokes, different cam duration, different capacities, different spool times, different torque...

just prefer to see results first, keeping my options open at the moment.

Thanks for the lesson, never would have guessed.

Sooner or later you are going to have to take a punt if you are going to try something new - the world isn't full of people testing the newest and until recently near-impossible things to acquire on every combination you can think of. If you want to know the exact result, buy a $400 China T3/T4 and stand away from the bonnet when it is on the dyno.

If you want to see if someone here has tried it, do a search - odds are there will be bragging, especially if it is a worthwhile result.

If you want an opinion from people who may have a clue of what they are talking about, ask.

If you CBF looking and aren't going to take opinions on board, then....