BNR S4

[EmPeEs6]

Originally Posted by Mazdazilla6 Attachment 210791

That would mean a theoretical capacity of 480 bhp. My S3 is able to flow enough for 370-380 awhp/450 bhp, so the power gains wouldn't be huge. Moreover it spools ~1000 rpm later and may require additional fueling. It's a great deal for those wanting to upgrade from stock to some GT30 turbo, but where's the great benefit comparing to the S3 (considering the long development period for the S4 and the fact that a GTX3076 gererates significant more airflow)?

[RPM]

Originally Posted by EmPeEs6 That would mean a theoretical capacity of 480 bhp. My S3 is able to flow enough for 370-380 awhp/450 bhp, so the power gains wouldn't be huge. Moreover it spools ~1000 rpm later and may require additional fueling. It's a great deal for those wanting to upgrade from stock to some GT30 turbo, but where's the great benefit comparing to the S3 (considering the long development period for the S4 and the fact that a GTX3076 gererates significant more airflow)?

There's something wrong with either the chart or your calculations. It's already been proven to produce ~475hp (at the wheels) at 27 PSI, spooling to 20 PSI by ~3700 RPM.

[EmPeEs6]

Originally Posted by RPM It's already been proven to produce ~475hp (at the wheels) at 27 PSI

Thank's for the clarification! In this case it's a real improvement over the S3.

[joeyspeed3]

It looks like a great turbo. I might sell my s3 and get one of this

[SpeedRebirth]

Originally Posted by EmPeEs6 That would mean a theoretical capacity of 480 bhp. My S3 is able to flow enough for 370-380 awhp/450 bhp, so the power gains wouldn't be huge.

370awhp ~ 463bhp
380awhp ~ 475bhp

[EmPeEs6]

Originally Posted by SpeedRebirth 370awhp ~ 463bhp 380awhp ~ 475bhp

I always use this calculator for the conversion:
Wheel Horsepower to Crankshaft Horsepower Guestimator

BTW: Why do you make "only" 370 whp on a GTX3076 - knock limitations due to poor fuel quality or insufficient fuel supply?

I would really like to try out this S4 turbo, but I without port injection (which makes another 2-3k including suitable intake manifold and installation) I will probably end up at the same power level as now (S3+E85) and just suffer from the much later spool...

[SpeedRebirth]

Originally Posted by EmPeEs6 I always use this calculator for the conversion: Wheel Horsepower to Crankshaft Horsepower Guestimator BTW: Why do you make "only" 370 whp on a GTX3076 - knock limitations due to poor fuel quality or insufficient fuel supply? I would really like to try out this S4 turbo, but I without port injection (which makes another 2-3k including suitable intake manifold and installation) I will probably end up at the same power level as now (S3+E85) and just suffer from the much later spool...

I'm still on stock block and stock fueling system lol. Was knock limited at 23psi and 13* timing on 25/75 E85/91. I would recommend a 5/6th port aux fuel system. Then you don't need an expensive PI manifold. They are around $900 for two injectors. Stratified will hopefully release their setup soon! @Lex; ???

[Alpha]

Originally Posted by RPM There's something wrong with either the chart or your calculations. It's already been proven to produce ~475hp (at the wheels) at 27 PSI, spooling to 20 PSI by ~3700 RPM.

Nice! Seems close to the EFR7163 flow wise then... Just with a 1000 rpm more lag to hit 20 psi. Sounds killer for stock style manifold guys.

[taf0422]

Who needs traction? Not fun trying to hold the phone. Lol. Didnt have the gopro on me at the time





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[BackRoads]

Originally Posted by taf0422 Who needs traction? Not fun trying to hold the phone. Lol. Didnt have the gopro on me at the time Sent from my iPhone using Tapatalk

Looks like, what, about a 5-sec 0-60?

Without hardly trying?

[taf0422]

Originally Posted by BackRoads Looks like, what, about a 5-sec 0-60? Without hardly trying?

Lol. It goes by quickly. Need to grab with a go pro and actually give it a legit shot. Just noticed that was with the traction control on too.

[EmPeEs6]

@RPM; Any news about the current production state, i.e. when will the pre-ordered turbos be ready to ship?

[RPM]

Originally Posted by EmPeEs6 @RPM; Any news about the current production state, i.e. when will the pre-ordered turbos be ready to ship?

He said he'd be working on them this week, so I expect all of the pre-orders to make it out by the end of the week.

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[The Nut]

Originally Posted by BackRoads Looks like, what, about a 5-sec 0-60? Without hardly trying?

Unless i misread the timer on the video, it was in the 4's. And that was with wheelspin.

[SamiChicago]

Looks like I'll be ordering the S4 since my S3 have some metal shavings inside thanks to my busted motor.