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Old 04-24-2016, 05:40 PM   #1
Krang
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ej207 v8 vf37

Default EFR 6258 .64ar IWG or .85ar v-band

Does anyone have, or know of a location that I can get some data on the .85ar v-band housing performance on a EFR 6258? I'm hoping that with the slightly larger AR and EWG I can maintain spool but not choke off top end quite as much.

My application would be a wide 2nd gear powerband with as flat a torque curve as possible.

Any information would be appreciated, and yes, I have searched.
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Old 04-24-2016, 10:49 PM   #2
LittleBlueGT
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For AutoX?

6258 is like a little better low-end then an STI turbo, but capable of say 30-50 whp more up top.

What gas? What other supporting mods?
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Old 04-24-2016, 10:54 PM   #3
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6758 using a .64 AR spools just as quick as the stock turbo and has plenty of top end. The 6258 is a hard sell for us since it's really not much more than a stock turbo for a good bit of coin. The 6758 is a good solid 360ish whp on a normal dyno and pump 93 and well over 400 whp on E85. The 6258 is going to be minus 30-40 whp realistically.
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Old 04-25-2016, 01:08 AM   #4
Krang
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Yes for AutoX.

I'm just about dead set on the 6258 since our local courses are very tight with average speeds between 20-45mph, 2nd gear mostly, even some first gear tight sections, but rarely.

My interest in the .85ar v-band would be opening up the top-end ever so slightly, and because it would be much easier to fit in my rotated configuration. However, I don't have any information on that housing, and would rather go with the .64ar IWG housing since I know what I would be getting into.

I raced a v8 ej207 w/ the stock vf37 twinscroll and it performed very well for our courses, however, having more torque out of corners is always great. Now, with my 2.5l setup I want to exploit that as much as possible with the stockish sized turbo.

The Evo's that I would be racing against don't have much more than 360-380whp, and I feel that my car will be prepped better in the suspension department. My goal would be to get as close to those #'s as possible without sacrificing that low end torque.

Hopefully this is making sense.
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Old 04-27-2016, 05:06 PM   #5
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I vote 67 over 62, don't think you'd be able to notice a difference at all.
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Old 04-27-2016, 07:32 PM   #6
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I own a 6758, and love it. For the average driver I would highly recommend the 6758, or even stepping up to the 7163....

That being said, the 6758 is a couple hundred rpm worse boost threshold then stock turbo (if supporting mods are apples to apples). It is not identical, close, but it is not.

So I totally agree with the OP wanting the 6258 for tight autoX courses. I know of one other member who did it, got a solid mid 3xx whp level, and gained a few hundred rpm in boost threshold, not to mention even better transient response.

It is quite literally the BEST AutoX turbo that I can possibly think of right now, assuming the courses are mostly tight and 2nd gear oriented.
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Old 04-27-2016, 08:34 PM   #7
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Quote:
Originally Posted by LittleBlueGT View Post
I own a 6758, and love it. For the average driver I would highly recommend the 6758, or even stepping up to the 7163....

That being said, the 6758 is a couple hundred rpm worse boost threshold then stock turbo (if supporting mods are apples to apples). It is not identical, close, but it is not.

So I totally agree with the OP wanting the 6258 for tight autoX courses. I know of one other member who did it, got a solid mid 3xx whp level, and gained a few hundred rpm in boost threshold, not to mention even better transient response.

It is quite literally the BEST AutoX turbo that I can possibly think of right now, assuming the courses are mostly tight and 2nd gear oriented.
Okay, sold on the 6258. Now, should I go with the .64 IWG housing or the .85 EWG housing? I've heard that the EFR IWG housings run large so I'm thinking the difference would be minimal except for the difference in EWG/IWG and also I'm hoping that the cleanliness of the V-band in / out setup will gain some efficiency as well.

Again, I can't find data on the v-band in/out housing on really any EFR turbos for a Subaru =/ hoping someone out there has some experience with them or can point me in the right direction.
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Old 04-27-2016, 11:50 PM   #8
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If I had the answers for you, I would be forth coming.

Did you ask Geoff at FR?
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Old 04-28-2016, 12:52 AM   #9
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Is there a twin scroll housing available for that size ???
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Old 04-28-2016, 11:34 AM   #10
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I have a 6758 (.64 A/R) v-band in/out with the aluminum CHRA. I hit 18+ psi in first gear on a V7 EJ207 and 21+ psi in 2nd gear. Makes 14 psi around 2800 rpm. Hell, I blew off my intercooler piping revving it at a standstill, it almost made 10 psi at redline. To put it lightly, this turbo is amazing.

*edit*

I forgot to mention this turbo is EWG only, as the v-band housing has no wastegate at all.
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Old 04-28-2016, 02:58 PM   #11
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That is exactly what I'm looking to hear, although 14 psi at 2800 rpm is unusual with my experience with the 207, but if its true then damn.

Subasaurus, where did you get your turbine housing? Did you order that directly from FullRace?

I did get in tough with Geoff, unfourtunately they only had logs from the IWG models and not from any of the EWG models for the smaller turbos.
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Old 04-28-2016, 06:37 PM   #12
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I answered all my own questions, thanks for the input guys.

Thanks for Subasaurus for bringing up the .64ar Indy Car turbine housing for these turbo's, sourced one so were going to do some fun things with the 6758 =)
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Old 04-28-2016, 07:29 PM   #13
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Quote:
Originally Posted by SubasaurusWrex View Post
Makes 14 psi around 2800 rpm.

What altitude?
What temp?
What gear?

Thanks
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Old 04-28-2016, 08:45 PM   #14
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Here's a quick 1st to 2nd with my tune that I'm still working on. I didn't launch, and just rolled off a light. Recorded on my Defis.

https://youtu.be/-wox8sh7pKs

Excuse the music, I didn't know it would record so loudly on there.
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Old 04-28-2016, 08:48 PM   #15
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Quote:
Originally Posted by LittleBlueGT View Post
What altitude?
What temp?
What gear?

Thanks
Whatever altitude Chicago-ish is?
Like 60s
4th - JDM 6 speed
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Old 04-28-2016, 09:08 PM   #16
Krang
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Quote:
Originally Posted by SubasaurusWrex View Post
Here's a quick 1st to 2nd with my tune that I'm still working on. I didn't launch, and just rolled off a light. Recorded on my Defis.

https://youtu.be/-wox8sh7pKs

Excuse the music, I didn't know it would record so loudly on there.
Can't hear the exhaust to give an estimation of rpm unfortunately. But watching oil pressure shows you are certainly spooling quickly!

Possible to get a vid without music?
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Old 04-28-2016, 09:11 PM   #17
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Ooh, I didn't record this while driving, my gauges recorded and I just played it back. The initial boost is me rolling out to around 2,000-2,500 RPM, then stomping on it and shifting at 8,000.

Size comparison to a VF30
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Old 04-29-2016, 09:24 AM   #18
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Made another vid last night with my dash cam.

https://youtu.be/cQEx0-DPl80
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Old 05-07-2016, 06:39 PM   #19
Krang
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I have a 6758 supercore coming with the aforementioned .64ar v-band housing. I will report back with some data on a 2.5l motor.

Killer-B header
Custom rotated up / down
EFR 6758 .64ar v-band in/out
AWIC in TMIC location
QTP cutout @ DP

Should be some fun stuff
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Old 05-10-2016, 12:49 AM   #20
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I predict full spool @ 3,600 RPM.
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Old 05-20-2016, 07:36 PM   #21
Krang
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EFR 6758 w/ .64ar v-band housing off an indy car turbo



The only .64ar housings that exist which are not IWG are these v-band ones off of an indy car setup, glad I found one!

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Old 05-20-2016, 08:32 PM   #22
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Very nicely done, you're gonna be blown away.
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