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BW91/79 Single Project


GlennK
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Luc, the top priority is to remove the gas flow restrictions from the inlet side and the exhaust side. So a big plenum and TB and a 4" straight through exhaust are required. I might also consider a bigger turbo with 4" V band...

 

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Mark, as per my Dynapack post:

 

At 1.2bar:

Hub Torque total = 1694 = rhtq of 1694/3.77= 449ftlbs (DIN)

Then the calculated rwhp is = 461hp (reduced by the drivetrain losses)**

And the calculated fwhp (assuming 20% auto losses) = 553hp**

 

At 1.9bar:

Hub Torque total = 1990 = rhtq of 1990/3.77= 528ftlbs (DIN)

Then the calculated rwhp is = 541hp (reduced by the drivetrain losses)

And the calculated fwhp (assuming 20% auto losses) = 649hp

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541 rwhp sounds fine for the setup.

 

I remember that the stock manif was restrictive on my setup. My Supra pushed (with the BW 91-79 unit) 603 bhp @ 1.3 bar and 626 @ 1.5 bar with the stock intake and 264 cams.

 

With the GReddy intake installed, the power was over 700 bhp @ 1.5 bar, and 767 @ 1.8 bar.

 

I guess you will see nice inprovements with a new plenum .. I was impressed by the difference it made.

 

Cheers

 

Luc

 

P.S. I'm still on a 3" DP/MP combo for the moment, so not that restrictive on the current power setup.

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What makes you think the stock inlet manifold/throttle body is causing a restriction on your setups?

 

I agree an aftermarket plenum/throttle body will improve things but I wouldnt say the stock manifold is a restriction at these power levels. Mine is still happy with the stock inlet/throttle, in fact my turbo is maxxed out not the inlet.

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When we mapped my Supra back last year on the stock intake, we wouldn't have gained much more with the 91-79 turbo by going up to 1.8+ bar. Ryan suggested to go for an aftermarked plenum for the next power step. After the installation of the GReddy intake, power seemed to raise even more at higher boost settings (although 1.8 ain't really high).

 

Luc

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Yeah. Luc does it himself....Me, I like to sit back and get it done for me ;-))

 

Seriously, I don't understand why I can't push 800+hp through an (uprated e.g. ML Boostlogic) autobox. There's supercars around that's handle that - and I don't mean on a US 2 shift Powerglide either. How does a Lambo or a GTR or a Porsche handle that power?

 

I know Jamesy has bailed out and going 6 shift manual. I will never say never in the pursuit of a nippy performance on Track or private road.....

 

A big TB and plenum give the 'compressed' air someplace to vent in a balanced and efficient way into the engine. The bigger the boost the bigger the squeeze and restriction you are going to experience. Logically, you've got to vent that volume out as fast as you are pushing it in. So a big bore exhaust without any bends/cats in it is what's needed.

 

And that's exactly what was observed at the Abbeywood Dyno runs...a bit of 'blowback' as the engine tried to do balloon impressions. So no point in running 1.9b as it's no good with my current setup. You can see my dyno numbers and the difference is not worth the engine stress :-(

 

But next Spring - I hope to have the system setup to handle the next power level I'm after - 750-850 hp.

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What makes you think the stock inlet manifold/throttle body is causing a restriction on your setups?

 

I agree an aftermarket plenum/throttle body will improve things but I wouldnt say the stock manifold is a restriction at these power levels. Mine is still happy with the stock inlet/throttle, in fact my turbo is maxxed out not the inlet.

 

I made 720 bhp with the stock manifold same set up.

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  • 9 months later...

I think that was at 2 bar Glenn. Mark has a fully built engine with stage 4 head (if I remember right), and 280 cams.

 

I have all the parts for the engine build at mine so far (JamieP's head with 280 cams, Carillo Heavy Duty rods, Mahle pistons, Syvecs ECU, ID2000, RPS triple carbon clutch, etc). Darren at Whifbitz will start beginning of next year with the engine build, and then I want to see what max I can get out of the S366 tubbie. I don't want a monster turbo, but something still streetable that makes full boost at 4k, but delivers 800 rhhp.

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