Time for some boost! VSR Motorsports Single Turbo Kit

MidnightBlueZ

Well the results are in and unfortunately we didn't hit the 700 threshold. Darn it.. However, the torque and power curve is ridiculous! We think the .82 A/R hot side had something to do with it not being able to push to 700. When the boost was raised to 19psi it didn't help any. Sooo, I'm happy with the results, it's too bad we couldn't make what we wanted (oh well) but it did make some very solid numbers! There is a video being made of the car very soon. I'm as anxious as some of you are..

639.5 rwhp
615.7 rwtrq
16 psi
E85

COSMO

Could be that single 3" exhaust held you back..

MidnightBlueZ

Yeah you could be right about that.. Maybe it doesn't have enough flow and one reason the torque is so high..

carlitos_370z

DAMN CAN WAIT TO SEE THE VID.. BTW THOSE ARE GREAT NUMBERS

jwick

COSMO could be right but isn't he downpipe 3" too? That would mean you have a bottleneck in the whole system.

Could be your TQ number is that high because the turbine housing is undersized. A bigger A/R might fix that but my knowledge of designing a turbo setup stops at having read Maximum Boost by Mr. Corky Bell

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'10 G37T 6MT Graphite/Graphite - BP - G37T Build

MidnightBlueZ

Yeah I think it could be possible but yes the downpipe is 3" too. 3" from the turbo back to be exact. Maybe a dual setup would help peak hp but would lose torque?

COSMO

No I don't think you would loose any torque but the curve would change.. You have to figure the ID ( inner diameter) of that 3" exhaust is probably 2.75 depending on the wall thickness. Turbo/ turbo's need No backpressure, Superchargers need some though...

MidnightBlueZ

I agree it would change some sort for sure! I love the single exhaust though it sounds awesome. I kinda doubt it's a 1/4" thick wall tube though. Still interesting..

By the way I did find out the charge piping is 2.5" which I believe BP stated before.

COSMO

Also that turbo is rated at 750hp since it is non ball bearing so I was expecting atleast 700whp on e85.. The max on that turbo should be right around 36psi..

COSMO

Can't imagine the heat that thing is going to generate since it is bottlenecking. I would highly suggest picking up a FI exhaust and open that thing up so it can breath and send a log to mike so he can make adjustments on your a/f...

COSMO

Here is a dyno I found from a Toyota supra using a 6266,6466, and 6766 precision turbo.. Notice the 36 psi but also keep in mind the toyo has a 3.0 liter motor and the z is a 3.7. The z will allow more air flow volume so 36 psi would not be needed...

Attached Images

supra dyno.jpg (122.3 KB, 18 views)

COSMO

The 2.5 in your case is fine because you have aftermarket MAF's.. The stock would have maxed out at 17psi with 2.5" intake tubes..

COSMO

Don't get me wrong those are great numbers but your system could be a lot more efficient...

jwick

Where did you get 17psi as the max?

I have 2.75" intake tubes and stock MAFs. I maxed at 11.3psi

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'10 G37T 6MT Graphite/Graphite - BP - G37T Build

COSMO

Don't know why these turbo kits just don't use 3" intake tubes so the MAF's aren't maxed out. My gtm TT kit came with 3" intake tubes and I'm on stock MAF's..