2867r, 6758 efr, or 7163 efr... why did I do this...

[zandrew]

So awhile back I snagged a set of 6758 efr turbos that were from indy car setups. They were never raced and only used for a low boost test and then sold. I sold one and kept the other and then traded the rare indy car housings for the factory housings. I have been running a gt307qr-wg 90 trim and it's an absolute horrible match too the 1.8t (though much better then the comp 5552 that died).

While waiting to find a fairly local clean example a4 avant to make mine I came across a gtx2867r and bought it. It's lightly used and ready to go. My thoughts was it would be perfect since I already have gt28 dp and exhaust setup.

Then I bought my avant and got straight up fucked on the title. While in limbo trying to get the title resolved I came across the turbo that is my number 1 pick for 1.8t or even a 2.0t, the 7163 efr. So I bought it.

Fast forward to now and it looks like the title issue is going to be resolved so I do not have to worry bought parting my avant. I am going to have some time since I have to replace the heater core, front windshield, redo headgasket, and maybe build its block. I really think the 7163 efr is the turbo but unlike the 6758 it's not internal wg nor internal bov. I have those parts so it's not a huge issue. I will have to make dp but I can do that. Flip side the 6758 is a great option but to me the 2867r makes more sense since I already have parts to bolt it in.

Stupid choices. I want 350 awhp.... I want to go faster 12.5 quarter mile.... I want it to be daily drivable....

[Dan[FN]6262]

6758 will easily make 350awhp, with a broad powerband.

[Believer]

I need a 6758 in my life

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[migaellefebvre]

6758 for the win, im sure even i couldnt decide on that or 7163


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[rodgertherabit]

6758 is a monster...

the gtx2867r is an amazing daily turbo. lots of fun, really no lag. plus it loves higher boost.

[Davdraco1]

I've been in dans untuned 7163 and I likey.

[Dan[FN]6262]

Lol you'll have to ride in it when it's done

[migaellefebvre]

6758 is a monster...

the gtx2867r is an amazing daily turbo. lots of fun, really no lag. plus it loves higher boost.

The gtx2867r spools faster than the efr 6758? And are power capabilities close?


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[rodgertherabit]

pretty sure the EFR will outspool the GTX.

[rodgertherabit]

Found this response on another thread here... seems appropriate.

Dan[FN]6262

"6758 = closest a 1.8T will ever get to a solid Stg 3+ S4 powerband.

7163 is a top end monster.



They're both very different. The 6758 is all about response, the compressor wheel is actually an old design and not new to the EFR like every other compressor wheel in the line up. It is designed to work at lower pressure ratios and move massive amounts of air, which it does. A 1.8T will max a 6758 out under 28psi with the proper tuning and supporting mods. IMO it's the perfect street car turbo if your goal is 400awhp.


I can't make a direct comparison of 6758 vs 7163 spool.

Was tuned specifically for the 6758, stock throttle body and stock intake manifold. Then I blew it up.

Thheeeeen I installed a Integrated Engineering intake manifold w/ 70mm throttle body, along with a 7163. All together it went from 25psi @ 3.8k rpms w/ 6758 to 25psi @ 4.7k rpms.

I did not even mess with the tune yet, because even at 25psi it holds 11.8 AFR, AFRs are spot on everywhere else. Timing is safe enough for me.

I definitely need to go in and adjust for the intake and TB, and I have an adjustable timing gear that I'm installing next timing belt service, should be able to get a good deal of the lost spool back when done."

[zandrew]

I think I got this figured out. If I go 2.0 build I will roll the 7163. If I go stock stroke then gtx2867r or 6758 efr.

The gtx2867r garrett really got screwed on. They made a racing class that limited inducer diameter to under 50mm so garrett made the gtx for that class. The next year they changed the spec and made it defunct. Still a good little turbo though I swear I don't think it flows what they advertise.

[spindoctor]

I think I got this figured out. If I go 2.0 build I will roll the 7163. If I go stock stroke then gtx2867r or 6758 efr.

The gtx2867r garrett really got screwed on. They made a racing class that limited inducer diameter to under 50mm so garrett made the gtx for that class. The next year they changed the spec and made it defunct. Still a good little turbo though I swear I don't think it flows what they advertise.

the EFR6758 is a good turbo, just dont overspin it.

I'll post up results when I crank the boost up on my 7064 TST4 + E85. Its now on 18psi and felt really good.

[Mr.Avant]

the EFR6758 is a good turbo, just dont overspin it.

I'll post up results when I crank the boost up on my 7064 TST4 + E85. Its now on 18psi and felt really good.

Interested in this convo. Just purchased an efr 6758 .64ar modified to vband flange for my 1.8l b6. I've read of some problems encountered from over spinning the turbo. You think the shaft speed sensor would be a good investment? Then the next question is, could it be used as an input to the ecm? Or would it just be strictly for a display unit to keep an eye on.

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[Dan[FN]6262]

If overspinning your turbo means blowing it up, wouldn't a sensor that you can easily install to stop you from overspinning it be worth it?

The ECU cannot accept new inputs, that should be pretty obvious.

[spindoctor]

If overspinning your turbo means blowing it up, wouldn't a sensor that you can easily install to stop you from overspinning it be worth it?

The ECU cannot accept new inputs, that should be pretty obvious.

^^this.

Standalone ECU(e.g Link/Haltech) can do wonders with safe guarding your engine, but that's another story lol.

[Dan[FN]6262]

^^this.

Standalone ECU(e.g Link/Haltech) can do wonders with safe guarding your engine, but that's another story lol.

Yeah, I wasn't going to start down that rabbit hole if questions like that weren't being asked.

Haltech/Link is very high quality stuff.

[Mr.Avant]

If overspinning your turbo means blowing it up, wouldn't a sensor that you can easily install to stop you from overspinning it be worth it?

The ECU cannot accept new inputs, that should be pretty obvious.

In what way is it going to stop the turbo from excessive speed. Other than being forced to watch another gauge.

It's possible to use the rear oxygen sensor as a voltage reference input for logging purposes.

https://youtu.be/XcqRCvFyM0A

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[Dan[FN]6262]

You don't have to watch the display like the last donut in the breakroom. You watch the gauge as you tune the car, once it's tuned, you're done.


If you felt like leaving it installed permanently, it would be helpful to diagnose boost and exhaust leaks.


And that is not adding a new input, that is repurposing an existing input.


The speed sensor works off of a 0-.5V signal, oxygen sensors are .1-.9V. I guess as long as you can figure out a formula to convert the raw data displayed in excel (from the datalog) to useable data, that it'd be possible. Nothing I'd feel like tackling.


EDIT:: Just realized the image says 0-5V, not 0-.5V. I dunno if it'd be possible.

[spindoctor]

Pretty sure the roadrage gauge for shaft speed has some sort of warning should you exceed a certain value(rpm).


But boy they're very expensive

[Dan[FN]6262]

they are pretty expensive lol

[spindoctor]

Pretty : very


Super expensive lol

[Dan[FN]6262]

oh shit, I forgot how expensive they are... maybe I'll keep it under 30psi for a while.....

[zandrew]

I thought the wideband voltage was .1v - 5v which would be applicable for the b6?

Why couldn't use a simple voltage style display as long as you knew what voltage corresponded to what rpm?

The weakness of the efr line is user stupidity but their design is superior to garret except in durability. I would hate to see what I subjected my 3071r too as I did not realize I did not have the comp gasket installed. I drove it around gouging the car trying to get it to make boost just spinning the dog shit out of it. Got home and realized what happened when I had the new gasket laying there. The garrett turbos are designed for a paper style gasket NOT an O ring. An O ring can actually hurt the turbo performance by pushing the comp housing to far away from the compressor. The efr turbos use an O ring gasket.

I have heard some of the gtx turbos use the O ring style but I have always used the paper style that corresponds to the compressor style, ie T04B, T04E, T04S, etc.

[Avant Nate]

Zandrew, do you know where to source the compressor cover tip that the Indy EFR's don't come with?

[zandrew]

Huh? I'm confused what your asking?

[Avant Nate]

Huh? I'm confused what your asking?

On the 6758 and 7163 turbos that were used for the indy cars, they have a three bolt inlet attachment similar to the eliminator gt's but seems BW specific.
http://www.ebay.com/itm/272367099100

[zandrew]

Just get a piece of aluminum that fits the cover and weld it in. You can't source a tip because there is not a tip for it.