Potential BHP from uk twins @ 1.2-1.4 bar or hybrids @ 1.4 bar

[ManwithSupra]

Now I know this has been done to death and the whole argument of if you are going to go hybrids then you may as well go single etc.

I was just thinking on my really boring hour and half drive home from work would there be any point in doing the following...

 

Larger intake plenum - Would this increase the power by a noticeable margin on Stock Twins/Hybrids? I am thinking there would be a "gain" but the stock Tubs (or hybrids) wouldn’t produce enough flow to make it worthwhile. Am I correct in thinking that? Has anyone done this? if so what BHP increase was found? If anyone has not done this then I would be interested to know if there is a technical reason rather than cost on why people do not do this?

 

Aggressive Cams and Adjustable pullies - Whilst this would produce a bit more torque/bhp power mid range (depending on Cams used) is it worth the investment when using say stock or Hybrids? If not why?

 

Ceramic coating the stock exhaust manifold and downpipe - This would bring down under bonnet temps but would this have any real noticeable effect on UBT's and Intake temperature?

 

Aftermarket ECU & Associated fueling mods (Injectors blah blah) - I know this can be done with Stock twins and keep the sequential system but how much of a gain are we talking on Torque and BHP?

 

Would be very intresting to see, UK's or Hybrids running 1.4bar with Cams, fueling, Aftermarket ECU and larger intake plenum and see what it makes?

[Ian C]

You won't end up with a slow car with that lot I used to have hybrid twins, 256in 264ex cams, an FMIC, 550cc injectors, and a Greddy EMB running the show. It would walk away from BPU cars, but it's still nowhere near a T67. Somewhere mid 400's I guess.

[gavin.starr]

Ive been thinking this also. When i get my house and the garage im going to give the car a good sorting out over winter, Ive already got some uprated twins but im unsure as to exactly what, they were second hand from micheal i think he was called.

 

So i was just wondering what could be done to make a stock supra run around 430bhp

 

I already have

 

Mines ecu (not sure if that will help much)

Full BPU (excluding boost controller, i have one it just needs fitting)

Uprated turbos

 

So next i suppose would be cams + adjustable pulleys,

new ecu (maybe) and map,

boost controller fitting,

and an aquamist kit to give a bit of an extra kick,

Larger injectors,

And maybe a new intake plenum if there were any gains what so ever over the stock one.

 

what do you recon.

 

Gav

Edited July 28, 2011 by gavin.starr (see edit history)

[sideexitsupra]

Stock Supra to 430?

 

Mine is stock and made 421 with BPU on an original 18 year old intercooler, Walbro, plugs, boost controller and Super Dragger.

 

Was a once only 1.27 bar on j-specs. Don't normally run them any higher than 1.2 though.

 

Verified at tdi North on their dyno.

 

So other than full BPU I guess you might only need cams depending on rolling road and how healthy yours is.

[AlliRR]

My Supra is BPU with hybrids, the old girl made 471hp @ 1.4bar... (381hp atw) I've been running with 1.6bar though with no problems a year on.

[Scott]

My Supra is BPU with hybrids, the old girl made 471hp @ 1.4bar... (381hp atw) I've been running with 1.6bar though with no problems a year on.

 

What RR is that though? They vary wildly.

[AlliRR]

Dastek dyno Scott, tbh though I dont really care about the HP figure - as long as its running well and keeping up/beating supposedly more powerful cars....

[Abz]

I assume the biggest issue really is the efficiency of the turbo's after you are passing 1.4 bar. I understand you mentioned about keeping the temps down under the bonnet but the internal components of the turbo will still be reaching a very high temp, which in turn will reduce the efficiency of the power it can produce. What is your end goal with your idea? More BHP? Or to make it sightly quicker?

[j_jza80]

264 cams, adjustable pulleys and a piggyback ecu would help.

 

You could probably see 500hp from the stock twins with enough work, though it all adds up. The plenum will be expensive considering the likely minimal gains it will provide.

 

You'll only want to go single eventually anyway

 

IMO, if you're seriously interested in this, you're really best starting off with a good UK spec (the turbos are a large plus, plus the injectors)

Edited July 28, 2011 by j_jza80 (see edit history)

[gavin.starr]

Can the original intake plenum be ported in any way to make it more efficient for air flow Ive never pulled one apart before to have a look inside to see how smooth they are inside.

 

Without looking or searching on here whats the size difference between uk and j-spec injectors and is the fuel rail interchangeable between the two models, Ie can i fit uk injectors to a j-spec rail etc...

 

I honestly cant see me going single (unless the missus dumps me) as it just way out of my price range.

[Nic]

Without looking or searching on here whats the size difference between uk and j-spec injectors and is the fuel rail interchangeable between the two models, Ie can i fit uk injectors to a j-spec rail etc...

 

J-spec injectors - 440cc Side Feed/High Impedance

UK Spec injectors - 550cc Side Feed/Low Impedance

 

You can fit UK injectors in a J-spec rail, you would also need to fit a resistor pack as the UK injectors are low impedance, you would also need an ECU mapped to suit the bigger injectors.