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Old 04-30-2013, 04:07 PM   #26
dburgoon
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Quote:
Originally Posted by BoboTheMonkey View Post
Why are you running 850cc injectors with meth? 565's are typically plenty for a vf series turbo and with meth, you need even less headroom.
For future plans if I do end up going with a 16g or 18g. I dont really want to buy new injectors if I decide to get the bigger turbo. And I have read reports of people running 98% duty on 650cc and at 21psi with the vf series turbo.
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Old 04-30-2013, 06:10 PM   #27
quazimoto
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Quote:
Originally Posted by dburgoon View Post
I could care less about peak numbers, I'm more concerned about where I make the power. I know the variables on dyno differences, I build miatas for a living and the numbers we put down on our dyno vary greatly from that of any other dyno, but we still build the fastest specs in the region.

I was just curious as to what numbers I could expect and/or shoot for with the set up I will be using.

I guess I should change my question too, "where will I see my power?" Is that better?
OK. So then look at the title of your thread. Would you like me to list how many VF series turbo's there are? Why don't you pick the actual turbo you are going to use and find out what dyno type is used. Then maybe people can give you a better idea. So you build cars professionally and you have to ask NASIOC what pistons to run?
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Old 04-30-2013, 06:18 PM   #28
dburgoon
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I guess I should just be straight forward then. I am going to track this car against my father, he said I couldn't beat him in my Wrx against my rx7. I need to corner faster and have a better exit speed because at the end of the straight that rx7 grows some legs and takes off! Not to mention it handles like a dream.

I need to know where my power will lie with a vf34 is what I am shooting for but maybe do a vf30, whichever I can find.

But I also would like to know what kind of numbers I will be looking at at xpsi with xturbo

So in conclusion, I'm not sure what I want exactly but I need a quick spooling turbo that will give some power down low.(I know I should've gone with a 2.5 but my budget didnt allow for that) My advantage against the rx7 is exit speed and cornering speed, that's where I need to shine.

I guess I was very vague with my original question because I wanted a vague answer, but it's getting more in depth so the question gets more in depth.

Thanks

EDIT: I build MIATAS, not subarus, and in the miatas I know what piston to run for said fuel, but I did not know if there was a better compression ratio for these engine besides the stock compression.
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Old 04-30-2013, 07:43 PM   #29
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Originally Posted by dburgoon View Post
I guess I should just be straight forward then. I am going to track this car against my father, he said I couldn't beat him in my Wrx against my rx7. I need to corner faster and have a better exit speed because at the end of the straight that rx7 grows some legs and takes off! Not to mention it handles like a dream.
Ok. So what have you done suspension wise with the car?
Quote:
Originally Posted by dburgoon View Post
I need to know where my power will lie with a vf34 is what I am shooting for but maybe do a vf30, whichever I can find.
They are the same exact turbo except the VF34 has a ball bearing CHRA. There is a decade worth of numbers in the "proven power bragging" section.
Quote:
Originally Posted by dburgoon View Post
But I also would like to know what kind of numbers I will be looking at at xpsi with xturbo
http://forums.nasioc.com/forums/show....php?t=1218459 Good luck finding that info...there is more than just boost that makes power. This again is a somewhat naive question.
Quote:
Originally Posted by dburgoon View Post
So in conclusion, I'm not sure what I want exactly but I need a quick spooling turbo that will give some power down low.(I know I should've gone with a 2.5 but my budget didnt allow for that) My advantage against the rx7 is exit speed and cornering speed, that's where I need to shine.

I guess I was very vague with my original question because I wanted a vague answer, but it's getting more in depth so the question gets more in depth.

Thanks

EDIT: I build MIATAS, not subarus, and in the miatas I know what piston to run for said fuel, but I did not know if there was a better compression ratio for these engine besides the stock compression.
Stock is 8.2:1. Most aftermarket piston manufacturers do 8:1,8.5:1 and 9:1. 8.5:1 would be optimal in your case. Also using a 3port BCS or an MBC (or both) would be beneficial over the stock BCS,even with an EWG. Also porting and polishing the turbine housing along with the exhaust manifolds will reduce spool time and make the car more responsive as well. Your set up is the norm. There are tens of thousands that basically run this set up on this forum.In case you have not seen this:
http://forums.nasioc.com/forums/showthread.php?t=533787
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Old 04-30-2013, 07:49 PM   #30
dburgoon
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^^first off, thank you! We are finally on the same page here.

I have read the manifesto and refer to it often.
I am planning on a Cobb ebc just forgot to put it.
I also plan on a PnP exhaust manifold and turbo to help with spool time

As far as suspension I have not started the upgrade process yet on this wrx (I just bought it)
But my plan:
BC BR maybe ER coilovers (not the best I know, but will do)
22mm front sway bar
25mm rear sway bar (I like a car with a bit of an over steer)
Also we both are running DOT tires, I am on a 245/40r18 all around

I will check the threads but does this seem like a good turbo for what I need?
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Old 04-30-2013, 07:59 PM   #31
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The turbo will be fine. So would a VF39,VF43,VF23 or a VF48. Or you could do a 16G-XTR if you want a better turbo than all those,but it's going to run some coin. Another option is the JDM factory IHI twin scrolls.
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Old 04-30-2013, 08:05 PM   #32
dburgoon
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Originally Posted by quazimoto View Post
The turbo will be fine. So would a VF39,VF43,VF23 or a VF48. Or you could do a 16G-XTR if you want a better turbo than all those,but it's going to run some coin. Another option is the JDM factory IHI twin scrolls.
I've been looking at the 16g-xtr and can see why it's worth the money, but have read it's spool come almost 500rpm later than a vf39.

Can you explain to me the difference between the vf39 and vf34? They are both the same bearing type correct? But different turbines?
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Old 04-30-2013, 08:14 PM   #33
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Originally Posted by dburgoon View Post
I've been looking at the 16g-xtr and can see why it's worth the money, but have read it's spool come almost 500rpm later than a vf39.
I doubt that. A plain old 16G-XT with a 7cm hot side spools just as fast as a VF39.
Quote:
Originally Posted by dburgoon View Post
Can you explain to me the difference between the vf39 and vf34? They are both the same bearing type correct? But different turbines?
http://forums.nasioc.com/forums/show....php?t=1141476

The VF39 is a standard journal bearing turbo.
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Old 04-30-2013, 08:34 PM   #34
dburgoon
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Quote:
Originally Posted by quazimoto View Post
I doubt that. A plain old 16G-XT with a 7cm hot side spools just as fast as a VF39.

http://forums.nasioc.com/forums/show....php?t=1141476

The VF39 is a standard journal bearing turbo.
Cool! I appreciate the help! I have a good deal of research to do before the car is running I guess. Again thank you
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Old 04-30-2013, 11:30 PM   #35
dangerousatom
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I'll stand my ground on the Blouch 16g-xt-r still being your final choice
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Old 05-01-2013, 12:22 AM   #36
BoboTheMonkey
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Quote:
Originally Posted by dburgoon View Post
For future plans if I do end up going with a 16g or 18g. I dont really want to buy new injectors if I decide to get the bigger turbo. And I have read reports of people running 98% duty on 650cc and at 21psi with the vf series turbo.
That has to be without meth though. Your IDC's go down with meth since there is a separate injection system. Not saying the headroom is a bad thing. Wish I would have gotten bigger injectors for E-85, but it looks like you are in FL, so probably not an option. Just curious in any case.

To follow up on another question, with a VF30/34 turbo, you should see peak boost around 3500 with torque running up to about peak at this same time. Usually holds that torque to about 6000 rpm and drops off. With meth, you may be able to push higher boost out a little further.
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Old 05-01-2013, 08:34 AM   #37
dburgoon
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^^thanks! And yeah I figured 850's would give me some head room but maybe a little too much? And yeah I have only 1 e85 station in a 100 mile radius

3000 isn't bad for peak boost, I'm hoping to run around 22psi strong so hopefully I can have something at the end of the straight against the rx7.
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Old 05-01-2013, 09:29 AM   #38
Dr. octagon
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with vf series turbo its either power down low to mid..........or down low to mid (besides the vf22). You want power in the straight......ditch the vf.

I would be looking at nothing smaller than 20g to 49 lb min turbo, nothing larger than fp red. Since we have no details on the rx7, we are all guessing......and bench racing.

Lag is over rated, stay in the power band
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