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Old 06-22-2011, 12:01 AM   #1076
methaddict
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Quote:
Originally Posted by NSFW
For a minute there I thought y'all were talking AVO and their twin scroll turbos.

Apparently, twin scroll housings are hard. I'm starting to see why they're so rare.
Why is it hard, Garrett developed a quad core already.
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Old 06-22-2011, 02:07 AM   #1077
Bariga
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rofl.............
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Old 06-22-2011, 03:16 AM   #1078
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Wonder if anyone actually fell for Garretts April fools joke this year....
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Old 06-22-2011, 03:21 AM   #1079
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Quote:
Originally Posted by methaddict View Post
Why is it hard, Garrett developed a quad core already.
Naw, dude. That was Intel.
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Old 06-22-2011, 04:49 AM   #1080
methaddict
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Quote:
Originally Posted by NSFW

Naw, dude. That was Intel.
Funny, I could've sworn Intel made the quad scroll. Haha!
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Old 06-24-2011, 12:08 PM   #1081
OrbitalEllipses
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Quote:
Originally Posted by MrLith View Post
Wonder if anyone actually fell for Garretts April fools joke this year....
That was awesome.
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Old 06-24-2011, 05:54 PM   #1082
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any news from anyone "?
>
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Old 06-30-2011, 02:14 AM   #1083
Aussiegman
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The 6758 is still running on my car and I'm looking at going up again to a 7064 with a 0.93 A/R twin scroll housing...

Will be interesting to see how that big a jump in compressor and turbine A/R will affect the power curve...
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Old 06-30-2011, 03:54 PM   #1084
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Why are you upgrading? How did the 6758 go?
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Old 06-30-2011, 08:06 PM   #1085
dachopper
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What has happened to this thread? quiet all of a sudden ?
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Old 07-05-2011, 10:07 AM   #1086
Aussiegman
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Quote:
Originally Posted by MrLith View Post
Why are you upgrading? How did the 6758 go?
Car started with a GT2860RS with a billet wheel and Tial 0.64A/R turbine housing. made 230kw ATW's and the turbo was holding it back. On the upside it was on boost at 2000 RPM, full boost but out of legs at 5000rpm

Went to the EFR6258, it made 280kw's ATW and the turbo was too small. Boost was on by 2500 RPM and pulled to 7500RPM, but there was still more in there.

Fitted the EFR6758 and made 280kw's ATW's but the medium actuator was being blown open and boost was dropping off at higher RPM's. spool was maybe 500rpm later, transient response was almost exactly the same as the EFR6258 but it had more top end. Win win...BUT, it was still too small and choking off the engine.

SO, after much hand wringing and sleepless nights, I am fitted an EFR7064 with the twin scroll 0.93A/R turbine housing. If that doesn't slow the bloody engine down then you know what, I think I'll just live with it!!!

If it max's out the 7064 it will be around 560 to 570hp at the crank given its running on E85. That going to be approximately 340 to 350kw's ATW's, in a front wheel drive!!!

As the farmer said to the pig,

That'll do pig, that'll do!!!
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Old 07-05-2011, 11:41 AM   #1087
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what car is this on?

and i'm jealous of all your efrness...
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Old 07-05-2011, 12:07 PM   #1088
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Quote:
Originally Posted by sumfoo1
what car is this on?

and i'm jealous of all your efrness...
Me too I'm on the fence one day I want the 6758 then the next I want 7064 arrrgh
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Old 07-05-2011, 03:38 PM   #1089
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Still waiting on my EFR to arrive. It's been months since I ordered it. Anyone get one recently or is everyone else still waiting?
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Old 07-05-2011, 03:49 PM   #1090
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Quote:
Originally Posted by Rex935 View Post
Still waiting on my EFR to arrive. It's been months since I ordered it. Anyone get one recently or is everyone else still waiting?
everyone with IWG twin scrolls are still waiting. a huge shipment end of july, so hopefully ours are on that palate. i ordered the ts 7064 IWG back in january. i feel your pain, haha.
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Old 07-05-2011, 04:02 PM   #1091
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Quote:
Originally Posted by SUBARIFFIC View Post
Me too I'm on the fence one day I want the 6758 then the next I want 7064 arrrgh
Always go bigger.



I just read the original post and I'm left wondering if that 20whp is really worth the extra $1000...
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Old 07-06-2011, 09:28 AM   #1092
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Quote:
Originally Posted by sumfoo1 View Post
what car is this on?

and i'm jealous of all your efrness...
Its on an Opel Astra Turbo. Runs a 2.0Lt Z20LET Ecotec engine similar to the US Cobalt Ecotec engines but has belt instead of chain driven cams and a few other bits.

Car is a pure track hack now





Personally I am amazed at how its performing.

Way over what I expected. I have an R34 GTR and had an STi V4 2 door as well as an Evo 6.5 and this is much more "fun" to drive and seriously quick on the track. It hasn;t the outright grip of the others, but a lot less weight and currently stacks of HP.

Even managed to scare a few EVO's off the track

Last edited by Aussiegman; 07-06-2011 at 09:40 AM.
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Old 07-06-2011, 12:43 PM   #1093
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Quote:
Originally Posted by Aussiegman View Post
Its on an Opel Astra Turbo. Runs a 2.0Lt Z20LET Ecotec engine similar to the US Cobalt Ecotec engines but has belt instead of chain driven cams and a few other bits. Car is a pure track hack now Personally I am amazed at how its performing. Way over what I expected. I have an R34 GTR and had an STi V4 2 door as well as an Evo 6.5 and this is much more "fun" to drive and seriously quick on the track. It hasn;t the outright grip of the others, but a lot less weight and currently stacks of HP.
Quote:
Originally Posted by Aussiegman View Post
The 6758 is still running on my car and I'm looking at going up again to a 7064 with a 0.93 A/R twin scroll housing...
Will be interesting to see how that big a jump in compressor and turbine A/R will affect the power curve...
thanks for posting your experiences, I agree you are going in the right direction to consider upgrading from a singlescroll 6758 to a twinscroll EFR 7064 .92 a/r when it becomes available. It would be wise for you to use the stiff wastegate actuator on all turbos, even your current 6758 will benefit

if you find yourself with 2 spare EFR turbos T2 flange, we make an RB26DETT header for your R34 GT-R
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Old 07-06-2011, 11:45 PM   #1094
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Thanks Geoff, i'll keep that in mind for the GTR..

You guys at Full Race have been great helping me sort and source all the gear.

I have the higher actuator already sitting waiting to go on the 6758 and the 7064 is ordered with one already. Also having the speed sensor fitted and wired directly into the Vipec ECU.

I'm hoping the 7064 will make a huge difference and should se us clear to 500hp mark easily, especially running E85...Next might be higher comp pitsons as its currently running 8.9:1. Looking at around 10:1 or maybe a bit higher, but then we'll need bigger head studs and maybe new sleeves...
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Old 07-11-2011, 03:51 AM   #1095
dachopper
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Hey Geoff

Contemplating a Classic GC-8 fitted 6758.

What "bits" do I need to bung it in ( up / downpipe and non standard intake?
, and does it fit at all in the stock location or need rotation and fiddling... Nick

any pics you may have of the size of this thing in a wrx bonnet would be great also.

Nick
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Old 07-12-2011, 09:52 AM   #1096
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If I go EFR it will be in a GC as well so I am curious what the fitment would be like too. I'm not afraid of some fab work but the allure of possibly buying a bolt on kit could weaken my DIY resolve.

In the interest of not confusing the part numbers up I will just say that I am anxiously awaiting some results of the next step smaller single scroll models. I want to see what the cost in peak HP is to have stock-ish spool out of one of these bad boys. With and without meth.
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Old 07-12-2011, 07:25 PM   #1097
SUBARIFFIC
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Quote:
Originally Posted by CKxx

Always go bigger.

I just read the original post and I'm left wondering if that 20whp is really worth the extra $1000...
I guess so if u want to be the next coolest guy on Nasioc..lol Honestly I think 49lb/min is fine for a DD so I'm gonna shoot for the 6758
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Old 07-12-2011, 10:21 PM   #1098
Aussiegman
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For my car as its purely for track use, and more specifically Time Attack, then the extra HP on bigger tracks will be worth it.

I am basically going to end up with a 6758 and manifold to use on short tracks and a 7064 and manifold to use on longer tracks like Sydney's Eastern Creek where the Yokohama World Time Attack / Superlap event is run (all things being equal I hope to run there next year).

It should be a relatively simple plug and play change over and a switch of ECU program to get it running.
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Old 07-12-2011, 11:25 PM   #1099
nevin95 LSi
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Quote:
Originally Posted by CJ68 View Post
...I want to see what the cost in peak HP is to have stock-ish spool out of one of these bad boys. With and without meth.
Same here.

I would love to know what the small one of these could do on a stock ej20, both for spoolup and for power.
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Old 07-27-2011, 10:07 PM   #1100
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Hey guys

There is a 6258 getting around in a pommie STI in the UK, tuned by Area51

From memory - It spools faster than the VF34, but the owner is still running reasonably low boost 17-19psi on the medium actuator which opens at 12PSI ! and making a little more than a VF34 would.

I vaguely think it's a 2.5L, and they said maybe the 6758 would be a better match for the 2.5L than the 6258, but boost response will be Much improved with a heaier actuator and tune
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