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Old 02-06-2005, 12:08 AM   #1
MKIIIsupra
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Default Need Help! Trying to make a Twin vf39 kit for my supra.

So heres the deal, since you STi guys sell your awesome BB turbos for so cheap, ive decided to make a Twin turbo kit for my '89 1JZ Supra. Currently I am running a t3/t4 that will hopefully be good for 400rwhp but i'd like more. I figure 2 vf39's should give me great spool and have the capabilities of producing ~500rwhp.

Question: Is there easy access to aftermarket flanges for the inlet and outlet of the VF39?? I see 3 pages of people selling these turbos but not a single one has a picture of the turbo. Ive seen the turbo in the car, but i cant figure out what kind of flange it is. I will probably try to buy two downpipes and use those for the outlet, but they are really wide and i am uncertain if two will fit easily in my engine bay. The manifold will be easy to make, im just worried about the flange situation and where to purchase these flanges so my life can be that much easier.






p.s. sorry about the dirty engine bay.
Thanks,

Jon
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Old 02-06-2005, 01:07 AM   #2
Timdog1650
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I dunno man, that would choke the hell out of the engine, even stock STis are pretty choked on the stock turbos at high power levels.....not to say it wouldn't work, but it would be VERY VERY difficult to make mroe power than a t3/t4
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Old 02-06-2005, 01:14 AM   #3
MKIIIsupra
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Quote:
Originally Posted by Timdog1650
I dunno man, that would choke the hell out of the engine, even stock STis are pretty choked on the stock turbos at high power levels.....not to say it wouldn't work, but it would be VERY VERY difficult to make mroe power than a t3/t4

You're saying two vf39's are too small to make upwards of 500hp???? One vf39 on your 2.5L motor will make 310rwhp, i figure two will will make around 500rwhp.
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Old 02-06-2005, 02:35 AM   #4
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It doesnt work that way... Listen Get a GT35R for that Six banger .. it will spool mighty fast on 3+ Liter and makes a mere 650 HP .. chow
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Old 02-06-2005, 05:50 AM   #5
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wow...

sleeper!
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Old 02-06-2005, 06:04 AM   #6
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Go for it. vf39's are great turbos and a pair of them should be interesting to try. If budget is a concern while doing the fabrication pick up some stock WRX turbos as those go for next to nothing and the VF39 will slot right in once all the fab work is finished.
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Old 02-06-2005, 06:08 AM   #7
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Cool idea.

~v6
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Old 02-06-2005, 12:12 PM   #8
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Quote:
Originally Posted by V6TurboTA
Cool idea.

~v6
Definitely sounds cool, and relatively cheap.

I thought the 1J was a 2.5L ??
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Old 02-06-2005, 01:13 PM   #9
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cool idea but the vf-39 is not repeat not BB
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Old 02-06-2005, 03:45 PM   #10
MKIIIsupra
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Yes, the 1jz is a 2.5L and makes an approx. 280-290rwhp on stock boost, stock turbos, with exhaust and intake.

The VF-39 is not BB???????????? I thought it was. What about stock wrx turbos, i need something nice and since my motor was originally twin turbo id like to bring it back to it origin. What good, cheap BB turbos are there I could use?? I saw the vf-37 in another thread, but that would be a little more expensive to obtain. Any help from you guys would be great, im not familiar with the subaru turbos and parts as of yet.
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Old 02-06-2005, 04:09 PM   #11
XT6Wagon
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BB turbos are vastly over-rated. And the VF-39 i supposed to be a BB turbo. I've never pulled one apart to check.
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Old 02-06-2005, 05:21 PM   #12
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There is a thread on here that has info about a guy taking apart a VF39 and he said it was a ball berring turbo. Unless that guy doesn't know what a ball berring center looks like.

Ryan
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Old 02-06-2005, 05:25 PM   #13
MKIIIsupra
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What Id really like to do is get a hold of a vf39 and take pictures of it side by side with our stock ct12a turbo. Im sure its much larger than the ct12a, but it would be interesting to see what a larger turbo could be seeing as stock turbos can net around 350rwhp.
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Old 02-06-2005, 07:49 PM   #14
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Nice Idea,

Pictures of Turbo

More Pics
Maybe that will help a bit. Sounds like a fun project.

Jason

Last edited by Genya; 02-06-2005 at 07:57 PM.
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Old 02-06-2005, 08:52 PM   #15
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I always thought the VF39 was a roller-bearing turbo like the VF-22.

Two turbos rarely outperform one larger one, with the exception being horsepower levels above 800 hp, or a large displacement V engine.

GT40R would do some serious whooping on that engine. You can pick one up for like $1500 from ATP Turbo.

Adrian~
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Old 02-06-2005, 09:19 PM   #16
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i personally think it's a bad idea. its going to be much harder to figure a way to mount these two turbos and then find a way to route the exhaust and intercooler pipes. Also the setups that are making good power on subarus are rotated mount turbos that get away from the stock flanges.
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Old 02-06-2005, 10:05 PM   #17
MKIIIsupra
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one large turbo wouldnt be too bad. If i was to go with a large single it would probably be a SP57, SP61, td07, something like that. Unfortunately, it will cost me about 1500 for a used turbo kit with a turbo of that size.

When i make the twin vf39 kit I will be using a Log style manifold. With this, it will be very easy to make and hopefully have just as good flow as a turbular style. with the VF39, i am worried about the very large outlet and will maybe try to weld the wastegate shut so i can use external WG's. Other than that I do not think the kit would be very hard to make. But... I havent tuned or dynoed my current setup yet so im really not even sure if im going to change this one. My car will be built for road racing so I dont need too much power; but its always fun to scare people =]. If i can accomplish 400rwhp and full boost at 3300 with this turbo there will be no need to upgrade. This is a big IF though.
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Old 02-07-2005, 12:38 PM   #18
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To be honest your gonna see more gains on a single. If I were you I would go with a sp61 with a .81 ar. You should depending on supporting mods see 500rwhp easy with spool somewhere around 1 bar at 3250 or earlier. I dont know what the 1JZ is capable of holding boost wise but that turbo will do 30+psi easy


My car MKIV sp71 with all the ++++++
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Old 02-07-2005, 09:30 PM   #19
MKIIIsupra
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I wish the sp61 spooled that fast on my car. Hopefully a sp57 will spool around 3500, that would be more than enough for me. As of now this t3/t4 will be good until i find its limits.
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Old 02-08-2005, 02:54 PM   #20
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honestly, trying to source the flanges and the ROOM for the 2 discharge pipe work will be the most difficult.

Even if you bought 2 used uppies and Dp's - would have enough to have gone to the single turbo route.

I think a 60-1 would meet your needs more than the vf-39's.
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Old 02-08-2005, 03:12 PM   #21
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This is a cool idea but if you really think about it.. its a bad one. The reason is that while the VF39 is small if you plot this you will be way under the effeciency on the map with these turbos. The reason I know this is because last year I thought of running duel IHI turbos mounted under the engine with super short path to the turbines. I plotted every VF turbo I could find and I just realized that this was no the best idea. Yeah they are cheap but they are also internaly gated which is also a big negative. If you have to do this choose two VF35's. They have a P15 turbine and will work better on the 2.5 ltr. Of course you could weld the gates shut and use an external which is what I would do.

It would be fun and neat and if you did it yourself it wont cost much. But lets be honest. You can get a T3 T4 format turbo that would produce your 500whp goal easy. Or you could get a GT35R and potentialy have that bolt in. The conical discharge turbine sticks out farther on the DP flange so that would have to be changed but your not talking alot of work here.. those turbos are $1300 ish. We have .63's and 1.06's instock but no .82's. They are on backorder right now.

Good luck with your project.

Clark
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Old 02-08-2005, 04:31 PM   #22
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just for reference i had a SP63 with a .58ar. It spooled nearly like stock on my car achieving 1bar at 3500 rpm. I was on the stock injectors and fuel with it and got 500rwhp at around 18psi with it. I would not doubt a sp61 or sp57 with a .58ar getting you your goal.

when did you see 1 bar on the 61 on your car?
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Old 02-08-2005, 11:24 PM   #23
MKIIIsupra
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right now its not tuned at all and im hitting fuel cut if i boost too much, so i see it around 4k. I will most likely see it much earlier with some larger injectors, a fcd, bcc and some good dyno tuning. I figure ill hit one bar around 3200-3500
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Old 02-09-2005, 12:54 AM   #24
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Best deal of all would be to buy two slightly used identical Evo 16g's from the DSM guys and use them!! Cheap Cheap and bigger and better than the vf39!

Richard
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