[mrida]

Hey guys. I have been eye balling this little upgrade for some time now but have not spotted any discussions on it yet, or heard any first hand reviews. This seems like it could be a pretty good idea for those of us looking to upgrade the turbo without having to make the drivability sacrifice or spend the $$$$ for a "Real Turbo". I would like to hear your thoughts on this.

Here is what I can figure out so far for pros vs cons. The stock vf39 is basicly limited to about 19psi before it spins out if its efficiancy range.... with a 40 or44lb/m turbo you should be able to get a hell of lot more flow into your engine make some decent power... Will the turbine have to spin faster to get the bigger compressor to move more air ? There has to be some cons to this on the turbine side of things. How well will the stock turbine/ wastegate be able to handle this.

--I admit I am no engineer or vast source of automotive knoledge so I'm having a hard time figuring out where the faults in this would lie... and every single thing is going to have a fault soo lets talk. Shoot it down or talk it up.

--If you want the link to the site here it is below

http://www.blouchturbo.com/turbos/IH...essor_Upgrade/

[WolfPlayer]

Originally Posted by mrida

The stock vf39 is basicly limited to about 19psi before it spins out if its efficiancy range

Not true. You can run the stock turbo to 24psi in the low-midrange without issue. The VF39 is efficient there. Now, at redline, yes, 19psi is too much for the little VF39 and it is inefficient there.

t

[mrida]

Originally Posted by WolfPlayer

Not true. You can run the stock turbo to 24psi in the low-midrange without issue. The VF39 is efficient there. Now, at redline, yes, 19psi is too much for the little VF39 and it is inefficient there.

t

Thanks for clearing that up Wolfplayer, ok this changes things a little more for me. Now with a higher flowing compressor such as a 20g the turbo shoudlnt have to "work" as hard to produced the same the cfm as the vf 39. I would say this would allow you stuff a bit more boost in there later in the rpm range to make some more top end right ?

[WolfPlayer]

Originally Posted by mrida

Thanks for clearing that up Wolfplayer, ok this changes things a little more for me. Now with a higher flowing compressor such as a 20g the turbo shoudlnt have to "work" as hard to produced the same the cfm as the vf 39. I would say this would allow you stuff a bit more boost in there later in the rpm range to make some more top end right ?

Absolutely.

t

[Boxer112]

i emailed them days ago but no response.. i been trying to find out about this also...

[mrida]

Bump for more info

[awd4life]

i've been comptemplating this "upgrade" lately also. the few things i can see being a problem is some increased boost creep, and associated fueling issues. being that the VF39 tapers so much as it does and the injectors are already close to maxed out, you would probably need at least some ~660cc's or around there to fuel properly in the upper RPM's w/ associated higher boost. or bigger injectors for possible future upgrades.

also, i would expect the pre turbine back pressure would increase causing some possible surging, typical to larger frame compressor mated to smaller exhaust housing setups.

i'm looking at the "upgrade" accompanied w/ some injectors and an EWG to round it all out, it all should net mid 300whp on my local dynojet.

th one question that i have seems to be the perineal "what CFM does the Vf39 push"?????????? if we knew that it would give a better understanding of any benifits to doing this upgrade.

[KiR DieseL]

Subcribed... im intrested in this also.

[mrida]

Originally Posted by awd4life

i've been comptemplating this "upgrade" lately also. the few things i can see being a problem is some increased boost creep, and associated fueling issues. being that the VF39 tapers so much as it does and the injectors are already close to maxed out, you would probably need at least some ~660cc's or around there to fuel properly in the upper RPM's w/ associated higher boost. or bigger injectors for possible future upgrades.

also, i would expect the pre turbine back pressure would increase causing some possible surging, typical to larger frame compressor mated to smaller exhaust housing setups.
--I'm with ya on this one. I think a ewg would be the only way to control the turbine

i'm looking at the "upgrade" accompanied w/ some injectors and an EWG to round it all out, it all should net mid 300whp on my local dynojet.
--completely agree, you would all other supporting mods for this, I would never run this with stock injectors.

th one question that i have seems to be the perineal "what CFM does the Vf39 push"?????????? if we knew that it would give a better understanding of any benifits to doing this upgrade.

--Ya This would be good knoledge to have. Where are all the super turbo know it alls on this one ?!!?!!? Chime in for gods sake

[big will]

bump for more info

Im live near Blouch and have heard very good things about them.

[Boxer112]

well Big Will, i think you should take a drive there tomorrow and get some info for us or give them a call. i would call but im over seas.

[mrida]

Lol, ya STi's dont swim soo well either. If you would be so kind to take a glimpse at the operation and see if you can find some results Alot of us would be very insterested. Are there any tuners out there that have tuned this type of hybrid turbo taht we know of ?

[Boxer112]

bump for info

[drumr78]

I live 2 miles from Blouch Turbo. I personally know the guys that work there. They are top notch when it comes to turbos. They know their sh*t. I'm pretty sure that the VF-39 is 34lbs/min but don't quote me on that.

[Boxer112]

ok, but what about their upgrade for VF-39 with 18G or 20G compressor wheel? Any other information on that?