[Closed] Borg Warner Efr Series Turbos

[Tonba]

^ Further more...

I wonder if the compressor wheels on the Airwerks line of BW turbos can be interchanged for the EFR compressors.
EG - Purchasing a EFR8374, removing the 62/83mm compressor and replacing it with a BW 64.5/88mm compressor... The turbine side should be large enough to still power that size compressor??

[GTScotT]

My brain says buy a 9180 and be a lot happier.

[Tonba]

^ You don't think BW will develop a 64mm turbo?

[GTScotT]

^ You don't think BW will develop a 64mm turbo?

My response was moreso in reference to a hybrid thing of potentially mismatched technologies, althouth in respect of this question I would say no. I don't.

The current field feedback doesn't appear to indicate a void between the two that would necessitate a new product, particularly considering the smaller demographic at the target outputs. Most of the early comments (admittedly from the likes of FR) read to the tune of "go bigger, you won't miss anything".

Sometimes its good to roll back and have a second read of the thread to form a better opinion on this sort of thing. A varied knowledge base like what most full-time SAUers have leaves our opinions a little tainted, and I feel we may be searching for a 64mm alternative purely because other hot-topic competitor outfits have them. Correct me if I am wrong but even FP have jumped on the PTE sizing bandwagon.

Anyhows, such is another opinion.

[cobrAA]

Here I am again, I took 2 weeks to read the whole 94 pages..

Long story short : RB26 Head need a rebuilt, I was leaning toward a RB28 + billet 60mm on my twins ; A few friends told me it would weaken my block and would push the turbos to their limits = not so ''safe'' and reliable option.

They told me to stay rb26 and put a single... more reliable and the single won't be pushed to the limits., I like the idea, so I want a EFR!!

RB26 Forged piston + type-B poncam ( I could swap them if needs to be..), I would really prefer to keep my 3 inch exhaust ( it's quiet and cops never give me trouble). IT WOULD BE TUNED ON 94 octane + WMI (aquamist kit).

I want response ( I used to drive GT-SS and somewhat missed the quicker response the gt-ss had Vs. the -5s) and I reckon IWG 0.92 would spool quicker than 1.05 and would be a good load cheaper!

- Considering I only have acces to 94+ WMI.. I don't think going any higher than 26-27psi is recommanded, Agree on this ?

So which EFR, should provide me the best response/power at 23-27psi on a 2.6L ? is 81/90

83/74 0.92 IWG ? ( I would upgrade to the Turbosmart IWG EFR option) I'm hesiting because sub-boy did 640whp on a rb30 with this turbo.. so with 400cc less and 3 inch exhaust vs 3.5, should I be expecting approx. 600whp out of it ? or even less..

(without beeing a dynoqueen, I somewhat wished to break the 600whp marks ( I was at 573whp with my -5s), but ''transient response'' is still more important in my book than the bragging number)

Edited August 20, 2014 by cobrAA

[Piggaz]

Stroke it and use the 8374.

[cobrAA]

Stroke it and use the 8374.

I'm afraid, I'm too poor to stroke it, rebuild/port the head, change the expensive oil pump and go single

[Joshbigt62r]

Stroke it and keep -5s. And go atleast 3.5" zorst. The bc 2.9ltr kit would really wake .5s.c/

[Full-Race Geoff]

I run both 8374 and 9180 turbos on my 2.6L engine, the EFR8374 is my call for a street driven 2.6L rb26... 1 bar by 3400rpm and so much fun to drive. The 9180 is a bigger turbo, comes on later and hits much harder. Regardless of this, the WG config will depend on which fuel you are using and your boost targets.. for a street car the 0.92 makes a lot of sense. i prefer the IWG because it is so simple and lightweight, but externals do have their benefits also

[cobrAA]

I run both 8374 and 9180 turbos on my 2.6L engine, the EFR8374 is my call for a street driven 2.6L rb26... 1 bar by 3400rpm and so much fun to drive. The 9180 is a bigger turbo, comes on later and hits much harder. Regardless of this, the WG config will depend on which fuel you are using and your boost targets.. for a street car the 0.92 makes a lot of sense. i prefer the IWG because it is so simple and lightweight, but externals do have their benefits also

your 8374 is the 1.05 right ? so should the 0.92 spool a tad quicker then ?

As for your question, I said in the previous post, we only have acces to 94 octane and I added WMI, so I imagine 27psi should be approx. the max I could go without being in the danger zone.

thank you

[SimonR32]

I run both 8374 and 9180 turbos on my 2.6L engine, the EFR8374 is my call for a street driven 2.6L rb26... 1 bar by 3400rpm and so much fun to drive.

1 bar at 3400 in 4th on the road? How about the 9180?

Videos please!!! That's almost enough to convince me to switch from my 6262 (if it fits on my manifold), in fact if I can make 700hp on a Dynapack with SAE2004 with a 8374 T4 1.05 and it makes 1 bar by 3400 I will purchase

[Full-Race Geoff]

your 8374 is the 1.05 right ? so should the 0.92 spool a tad quicker then ?

As for your question, I said in the previous post, we only have acces to 94 octane and I added WMI, so I imagine 27psi should be approx. the max I could go without being in the danger zone.

thank you

Im switching back to 8374 0.92 a/r now. We have a new shop track car to focus on, so my Nissan will go back to being a fun casual project. Considering your boost limits and fuel, I agree the 0.92 could work well. Just expect the turbo to run out of exhaust flow around 625-645whp as opposed to 700-730 with the external gates and 1.05 a/r

1 bar at 3400 in 4th on the road? How about the 9180?

Videos please!!! That's almost enough to convince me to switch from my 6262 (if it fits on my manifold), in fact if I can make 700hp on a Dynapack with SAE2004 with a 8374 T4 1.05 and it makes 1 bar by 3400 I will purchase

compared to 8374, the 9180 came on song ~400-500rpm later. I can not verify fitment on other company's manifolds, but even on the older Full-Race RB manifolds the EFR will fit no problem. Just make sure its divided with dual wg for optimal performance. If a gt40R can fit it then EFRs can fit

here is a dyno video from a couple years ago when my car had 8374 1.05 a/r on a dynapack with R33 trans and catalytic converter:

Edited August 22, 2014 by Full-Race Geoff

[cobrAA]

Im switching back to 8374 0.92 a/r now. We have a new shop track car to focus on, so my Nissan will go back to being a fun casual project. Considering your boost limits and fuel, I agree the 0.92 could work well. Just expect the turbo to run out of exhaust flow around 625-645whp as opposed to 700-730 with the external gates and 1.05 a/r

I apologize for being annoying in advance

I rather save 1000$ish and put it toward a Quaife front diff ( my engine is coming out this winter). However, I also know, 6 month later, I will regret not paying an extra 1000$ to get an extra 75whp so I rather do it right the first time. ( At the same time, I gotta ask if 700whp ish isn't too hard for a standard 5speed gearbox..)

Spool : How much of a difference is there between the 0.92 and 1.05 ? Are we talking something like 150rpm or we're talking 400-500rpm ?

Power: I know the 1.05 can make 700whp, you did it, but you also had 3.5 inch ( I have 3 inch) and you have E85 ( I only have 94+WMI), so given the same 1.05ar , shouldn't I be more in the 650whp mark Vs your 700whp ? In other words, I'm unsure if my setup will be able to make ''full-use'' of the 1.05ar.

Thanks a lot! ( I rather write it here than PM so other can benefit from the answer)

[Full-Race Geoff]

I rather save 1000$ish and put it toward a Quaife front diff

I consider a good front diff a mandatory upgrade on an R32/R33 (stock is fragile) and even though R34's front diff is stronger the improvement in vehicle dynamics from a proper limited slip differential is hard to argue with

I gotta ask if 700whp ish isn't too hard for a standard 5speed gearbox..)

yes, 700whp is too much for a standard 5speed and wayy too much for a stock front diff. front diff will probably fail before the trans, but 3rd and 4th gear will let go too.

Spool : How much of a difference is there between the 0.92 and 1.05 ? Are we talking something like 150rpm or we're talking 400-500rpm ?

with the stiff actuator on the 0.92 a/r I'd guesstimate the spool difference to be ~200-250rpm due to the smaller A/R.

However, if a soft iwg actuator is on the 0.92 then they will spool about the same

I know the 1.05 can make 700whp, you did it, but you also had 3.5 inch ( I have 3 inch) and you have E85 ( I only have 94+WMI)

since you only have access to 94octane fuel with water/meth you are not going to be making that kind of power safely. Pump fuel is such poor consistency from pump to pump that you can not safely map with aggressive ignition timing. I made 590 on my car with pump gas, I could have made more and pushed it harder but I think that is probably a good stopping point and with meth you can get into the low-to-mid 600 range.

keep in mind i was using an off-the-shelf catalytic converter, thats a big restriction. Admittedly we try to run E85 in everything since its easier on the motor to run high boost with some ignition advance

[cobrAA]

my friend posted that on -5s ( poncam type-b, 3.5inch,rb26,94octane), you think a 83/74 1.05 can achieve that same level of spool while making more power ? or else i will stick to the 0.92 a/r lol

[Piggaz]

A mate on here went from -5's to a 8374 internal 0.92 rear. 5-700 rpm earlier it comes on and makes more power. Given that Geoff reckons the 1.05 will be 150-200 rpm behind the 0.92, you're still infront.

[cobrAA]

A mate on here went from -5's to a 8374 internal 0.92 rear. 5-700 rpm earlier it comes on and makes more power. Given that Geoff reckons the 1.05 will be 150-200 rpm behind the 0.92, you're still infront.

so it's a done deal. Buying a 1.05

Btw, did your mate posted his result/comparaison somewhere on the net, I couldn't find any rb26 with a 0.92 from my research.

Will gladly post result when I have them ( in about 6 months considering where I live lol)

[cobrAA]

I see Fullrace sell the TIAL Q BOV in their EFR turbo kit.. Would an external BOV kill some of the response Vs. the OEM bov found on the EFR ?

[Tonba]

^ Theoretically it would kill some transient response. But not sure. Maybe Geoff from Full-Race can chime in?

[Full-Race Geoff]

negligible, the EFR kits we offer are all designed to use the integrated recirc BOV. if there is a tial BOV listed it may be a mistake on the site