Time for some boost! VSR Motorsports Single Turbo Kit

jwick

My 3" upgrade is being fabricated as we speak

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

COSMO

How much more boost are you going to push your car on a stock block?

phunk

Stock MAFs and 2.75" tubes for my car.

Is anyone actually hitting the end or just getting close to it and stopping? Once I started nearing the end, every .01v took a lot more air and when it looked like it was going to max out, there was still a lot more power left. I did eventually max them out just before I stopped going higher anyway.

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COSMO

At around 17psi mine are 4.7V and that's with my 3" intake tubes..
Still waiting to see that Mullet Hair do with your new mustang......

phunk

You got a long way to go.... if I recall correctly, the last few tenths of a volt are good for over 100hp. Anyone agree or disagree with that? I didnt really start paying attention to my MAF voltage until passing 550 and I believe i was already in the 4.7-4.8v at that point.

you got a long way to go with my hair too, its currently about a half inch long in the back.

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jwick

Not hardly any. My goal was 525whp and 450-475wtqish. I'm at the torque level but not HP. We did a pull at 11.8psi and it hit 518/479 but it leaned out a little up top so we dialed it back a half pound and called it a day (503/465).

I'm maxed out. At 11.3psi I'm at 5Vs around 7200-7300 rpms. When I log it in UpRev one MAF sensor reads 5.0 and the other is like 4.95. I can't say which one is maxing because the chart in UpRev doesn't differentiate.

Phunk - I also think it's about return fuel setup time. Need to get on the phone with you and discuss a few items to determine what's the best direction.

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

YzGyz

I have the same hp/tq goal for my car, 475hp/425tq DD and 525hp/475tq drag.

Anyhoo, back to the VSR build.

YzGyz

Boosted Performance

Inside diameter of a 3" piece of tubing is 2 7/8". Standard thickness is .065" (1/16") on exhaust tubing.

The compressor is rated to flow 75lbs/min, and the fact that it is a BB turbo does not change that spec. Remember, the compressor can flow that much, but a small turbine can't. So when looking at a turbo and the HP rating, always assume that the HP rating is for the largest turbine available for that particular turbo.

Also, comparing a 2JZ engine to the VHR engine should not be done. They are very different. The VHR heads will flow 4 times more air...again, flow will reduce pressure and increase efficiency.

I have customers using the 6266 turbo on the VQ35, and making mid 600's on pump gas at 18psi of boost, not E85. The big difference is flow, because they all have the large T4 turbine housing.

Pressure and flow are two very different things, and if you can run 17psi of boost on the stock MAF's, then you have no flow (since this is what the MAF sensors measure). If you don't have flow, something is choking the system.

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COSMO

The comparison between the 2jz motor was just to show the psi rating for that turbo.

Wasn't sure of the inner diameter of the 3" exhaust but non the less it should be bigger to allow for more flow.

Sure you can run 17 psi on the stock maf's but it's really pushing the limitations due to the resolution.

Sasha has spoken everyone and for someone who makes these kits part time we should all listen too and never say anything without checking with him first...

MidnightBlueZ

I may pick one up in the future but I'm good for now. Wouldn't be a cheap upgrade and I love the sound of a single. I'm more worried about traction right now. The power this is making is plenty. I know what it can produce later but where I'm at will suffice.

I don't think the twin scroll would fit as easily or maybe at all...

jwick

You'd have to modify all your hot side piping going into the turbo to run a twin scroll. It would sound no difference. I also wonder if you have the room under the hood for the turbo because the twin scroll turbine housing is larger.

I say enjoy your car and spend your time trying to figure out how to make 620wtq hook

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

MidnightBlueZ

That's what I was referring to in my last statement not being enough room.

traction will be a great task with this one lol..

Boosted Performance

Again, pressure is a result of resistance to flow, so comparing boost pressure between two very different engines with very different VE's is non constructive.

You can pressure up the charge tubes to 100 psi if you want, measure the MAF voltage, and they will read 0 Volts. It is a mass air FLOW sensor, not a pressure sensor.

I am sorry if my knowledge and experience sharing with the comunity is offending you. I build the kits, and have been for a long time. The feedback I get from pro-tuners is really what matters...so when they say that the MAF sensors are maxed out at 11-12 psi (with 2.75" pipes), it means that the system is working very efficiently and the engine is actually ingesting a lot of air. This is with the 2.75" charge pipes. I suspect that the 3" should be good to about 15 psi, assuming EBP is low and the turbines are capable of good flow.

You seem to have some hard feelings towards me...and I have a couple of guesses why. Just remember that in the end it was your call.

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Trips

Lets try to keep on topic and civil.


Thanks

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MidnightBlueZ

Bobby is shooting the video tomorrow. So I would say it should be ready to watch in a day or so if not the same day. Looking forward to it!