Estimate BHP for BPU car at 0.8, 0.9,1.0 etc

Right guys i did use the search and couldnt find much really.

So maybe it hasnt been done before!

Anyway after blowing my gearbox last weekend i was thinking maybe i shouldnt be running my TT engine at 1.2bar with a 5 speed box

So what i was after is a few estimate BHP for my car running at different levels.

My mods are:

Blitz Nur spec R Exhaust System

Full 2.5" stainless decats,

FCD,

Walbro uprated fuel pump,

NGK Iridium spark plugs,

Greddy Profec B Spec 2 boost controller,

Greddy LS type front mount intercooler,

Apexi Power intake

im pretty sure thats it.

So for exsample.

0.7bar BHP??? Isnt that standard boost pressure?

0.8bar BHP???

0.9bar BHP???

1.0bar BHP???

1.1bar BHP???

1.2bar BHP???

Obviously no one car but certain but a guide would be nice also i class my car as BPU+, but is that correct looking at my mods or is it what they call ++ or +++ i wasnt sure.

Thank you.

Stock is 0.8 iirc so I would guess at 12-15bhp per .1bar maybe up to 20bhp max per .1bar

my estimation is on a stock car running around 320 @ 0.8 to 380 @ 1.2 so 60 divided the 4 increases between 0.8 to 1.2 to give a conservative'ish 15bhp of course some are running nearer 400+ @ 1.2bar

Like I said in my previous post, its russian roulette using a 5-speed on a TT car especially at BPU levels, I would have just saved the extra and got the 6-speed or Auto TT box.

If it were me and I wanted it to last I would probably put both cats back on and take it back to stock levels, but even then, there is no garauntee its going to last

I'd like to know what actually kills this gearbox, heat??? if so I'd think about fitting a oil cooler or put in a R154 (can be picked up for under £200) or save for the 6 speed

Like I said in my previous post, its russian roulette using a 5-speed on a TT car especially at BPU levels, I would have just saved the extra and got the 6-speed or Auto TT box.

 

If it were me and I wanted it to last I would probably put both cats back on and take it back to stock levels, but even then, there is no garauntee its going to last

I have a "i need a 6speed gearbox" savings funds its just not doing very well at the moment.

I'd like to know what actually kills this gearbox, heat??? if so I'd go about fitting an oil cooler

I think its the torque Tom but i will wait to see if someone corrects me.

I have a "i need a 6speed gearbox" savings funds its just not doing very well at the moment.

just hold out through this recession, make the 5-speed last as long as you can then slap it on a credit card

just hold out through this recession, make the 5-speed last as long as you can then slap it on a credit card

dam your good! read my mind!

Will a 6 speed box require a different clutch?

Almost positive it does, Thought i'd ask to comfirm.

Will a 6 speed box require a different clutch?

Almost positive it does, Thought i'd ask to comfirm.

Yer i will need to put the 6speed flywheel back on and fit a 6speed clutch.

Yer i will need to put the 6speed flywheel back on and fit a 6speed clutch.

Thats a good chunk of money just there, Without getting the 6 speed box.

How long has your N/A 5 speed box lasted?

What is you driving style?

Sorry for the mass question's.

Thats a good chunk of money just there, Without getting the 6 speed box.

How long has your N/A 5 speed box lasted?

What is you driving style?

 

Sorry for the mass question's.

Its fine mate,

My box last 4000miles running it at 1.2bar. my car to me is a toy that goes out in the evenings and weekend only, it does get driven very hard at times. So it was expected.

I plan to just enjoy it for now and carm down so i dont break it again.

Thanks very much indeed.

I have been researching the N/A - TT Conversion for a while now, And planned on getting it done this summer, But i've gone and bought a house, So i've been putting the wages on furniture, big TV's, Mortgage and general boring non car bits and bob's.

This gear box stuff is a little concerning as I am a sensible driver, But have already broken two Diff's. (Not proud of that)

Only just put a spanking new RPS street max clutch on, So i think i will go down the same route as you, But have read the mkiii supra turbo gear box is stronger than the N/A, But weaker than the 6 speed. So might look into that.

Cheers mate.

Small SA there...

The W154 gearbox is what you want with a 1JZ bellhousing. Good for BPU and small singles all day long.

The W154 gearbox is what you want with a 1JZ bellhousing. Good for BPU and small singles all day long.

Thats the kiddy.

Although i've learnt something new there, Did not realise the bell housing needed to be changed.

Thanks

Mine made 369bhp fly at 1bar, cant remember the rwhp

mine made 367 at 1 bar with 401 ft/lb of torque.got another rolling road day on the 8th,have fitted a blitz boost controller since the last one and going to run it at 1.2 bar.will let you know how i got on.mines is an auto though.