ok we can speak about it here

 

To get things started....I know that the VJ-23 is better than the VJ-20. How exactly is that? Any website that I can educate myself on this ???

 

Well its Bigger Stronger and is a ballbearing turbo...Jon

 

here is one click here

 

If I remember correctly the VJ-23's compressor wheel is about 6mm bigger than the VJ-20 either way they both are too small IMO I think the max HP effieciently is around the 275 mark...I may be wrong thouhg not very insitful on IHI.....Branden you out there???

 

the vj-20 is good for like 220hp i think and vj-23 is over 300. the Vj-23 in the blue EGT hit 325 hp ...Jon

 

If the Vj-23 can handle over 300hp then it doesn't sound like it's too small to me. Either way, it'll be really hard to keep the car streetable at that much hp.

 

With 300 plus hp ur looking at mid 12's maybe less . Its not a small turbo its good size ...Jon

 

300 hp at how many lbs of boost, cause you know different turbo's put different power at different lbs of boost
just curious
Bruce

 

Well he did it at 30 psi i think. But if u get the head P&P ur suppose to be get the same numbers at like 17 psi ...Jon

 

so what is the price difference between the VJ-20 and the VJ-23?
....manifold and turbo

 

Vj-20 and manifold is 400-500 Vj-23 turbo and manifold 900-1000...Jon

 

$500 difference...............and that's from Branden ?

 

Thats what he normally sells them for. Jon

 

We tuned Adam's GTX motor with a VJ-23 on it to 282whp @25psi. Which is in the efficiency range of the turbo and where the GTX head could flow no more. We tried it at 30psi and only gained torque.

Contrary to what you may think jesse the efficiency range of that turbo is 1.8bar which is 26.46psi. It has a maximum boost of 2.3bar which is 33.81psi.

Here is a comparison of the turbo's with a T28 also.

Gtir T28 Turbine 53mm
Compressor 60mm

Gt-R Vj23 Turbine 62.5mm
COmpressor 65mm

Gt-X Vj20 Turbine 52mm
Compressor 52mm

As you can see the GT-R is MUCH larger, and is about the size of a small T04.

A VJ-20 will max out its efficiency at 12psi. It will run 18psi till 3500rpm and drop slowly down towards 9-10psi by redline.

A GT-R turbo will run 30psi to 8000rpm as displayed on our dyno videos from adams web page. A link is available off of my site.

Due to the rarity of the GT-R turbo, if you can get one I'd recommend using it as a bolt on. If not, go with a small t3/t4 combo.

Also, this talk about streetability.. We ran adams car at 10psi on the street and had the boost controller setup at the turn of a ****, i set max boost to 25psi and we pulled up on a porsche and took off at 10psi, then i cranked the **** and screamed past him at 25. The turbo kicked into overdrive at 4000-4500rpm but spooled nicely at 2800.