PrimeKos

iTrader: (1)

So just to summarise based on the above comments;

2.0 - VF35 unported with supporting mods. 330 to 360 BHP

2.0 - VF35 ported with supporting mods. 350 to 370BHP

2.5 - VF35 unported with supporting mods. 320-340BHP

2.5 - VF35 ported with supporting mods. 340-360BHP

2.0 - VF43 unported with supporting mods. 350 - 380

2.0 - VF43 ported with supporting mods. 370 - 400

2.5 - VF43 unported with supporting mods 370 - 400bhp

2.5 - VF43 ported. No figures shared

Blocks85

Just for anther piece of info.
The 2007 2.5 Sti hawke that my vf43 came off, the car had just a remap and was putting out 347 maxxed out.
Cheers

chopperman

That's quite a low figure for the 2.5 with a vf43. Most make 360 with a cat . De-cat should see 370's 380's and some as high as 390.

scooby2.5maz

iTrader: (16)

Suppose it depends on boost amongst other mods fitted !! My spec d Sti is running 340 bhp x 360 torque on standard top mount , 99 Ron ! 1.35 bar tailing down to 1.0 bar . Decat also

chopperman

True but he said it was "maxed out ". Im running about 1.6-1.65 bar which is about the limit on my VF43. Any more and i'm just making hot air.

scoobyboy1

iTrader: (16)

What happened to your RB5??? Nice clean car!!!

Pez

Well on my hawk with a ported vf43 I'm running 396/420 but obviously with all the supporting mods... Still on standard injectors and internals! Makes for a great road car, and very little lag

Before it was ported it was running 393/470!!!! Massive boost creep hence the huge torque figure, was a very bad drive. Porting made the car totally different and safe, running 1.4 bar and so much more driveable, best mod ever.

scoobyboy1

iTrader: (16)

<<<<<<<Just looked at your garage and you have the same mods as me, except mine is not ported.

470lb/ft thats crazy, where was this dyno'd at???

Pez

Yeah it was crazy and I hated the way it drove, anything over 60mph and the accelerator was just a switch, either full power on or nothing. It was dyno'd at DSA... Think i may have to graph some where.....

Pez

Here you go....

Blocks85

@ chopperman
Regards to maxxed out, all I can relate is the person I bought the 43 off said he had the car mapped and as much as the turbo would give and it made 347.
He changed it for a sc42.
Just Thiught it maybe if some Internet in your findings and research.
Likewise my blob Sti only made 317 after a remap @ 1.5 bar

Blocks85

My vf35/43 and pez's vf43 were both set up and ported by Iain duncan(big d) on here.
Cheers

Kwik

iTrader: (10)

What would a VF43 be like on a forged 2.1?

chopperman

I suppose each car and even some of it components are different from one and other. Most VF43's max out at around 1.6-1.7 bar.
This is a BR delta dash graph of mine with a non ported VF43 and running a cat. The graph was done on a hot muggy day with a freshly forged engine that had only covered 1000 miles, so still tight and not fully bedded in.

Pez

This is a BR delta dash graph of mine now...

chopperman

Thats impressive, especially from a vf43. Looking at your mods it must be the FMIC, headers and de-cat. Plus ported VF. Gives me a shopping list for the future.

Big 'D'

I was just going to post this up, it made a huge 424bhp and 456 torques on Bobs delta dash, however more importantly Bob had also done the previous map and purely by altering the wastegate port size and actuator pressure plus the intake setup huge positive changes were made.

Cheers Iain

Big 'D'

chopperman

Is that on pump fuel or did it have a meth mix ?

Big 'D'

V-Power only

chopperman

Thats very impressive indeed

Big 'D'

Thank you, the biggest change however is not so much in the BHP/Torque figures its in the overall drive of the car as I am sure the owners will agree.

Cheers Iain

chopperman

I've also heard that porting the VF43 stops the waste gate cracking ?

Big 'D'

The main issue is boost creep, on Pez's Sti the boost creep was probably the worst I had ever seen, it was pushing 1.5+ running actuator pressure only on the factory actuator. As there is a choking at the wastegate port the thermal loading at that point will be different than the rest of the turbine casing, due to this difference in temp the turbine housing is continually expanding and contracting at different rates, eventually this will cause a crack. The cracking appears more common on cars that have been modified and driven hard, by removing the choke effect at the wastegate through porting you greatly reduce the difference in thermal loading and in turn reduce the likelihood of a crack forming. We have discovered however that if a crack has formed and is weld repaired that it may reappear as there is already a weak point in the casing.

Cheers Iain

chopperman

Thanks for the info mate. Very interesting

scooby2.5maz

iTrader: (16)

Hi mate , swapped for the spec d plus cash my way !! Became a bit of a handful on the road , lol ! At one point it was running 575 but needed bodywork and tidying up a bit plus the mrs hated it !! Lol !! Too fast she said !!

scoobyboy1

iTrader: (16)

Spec D is a nice car, love the discreet look of them.

I love my hawkeye STi, drives nice, fast when you want it to be, comftable to drive, would love to forge my engine at some point and push the VF43. After seeing some figures on here with the VF43, think I might do some porting in the winter months.

Love the way the VF43 spools up on the 2.5, so dont really want to change it unless it breaks.

scooby2.5maz

iTrader: (16)

Lol, I fancy rods and pistons and then maybe push for 480 or so !! Obviously with a change of turbo ! Any suggestions on choice of weapon ?

ScoobP1

iTrader: (1)

Can anyone tell me what the spool is like with a Vf43 on a 2.0 with supporting mods?

Steve's Sti

iTrader: (2)

i was only running 1.45bar just to be safe as wasn't forger, sc46 i'm running now much happier lol. was good seeing the vf43 getting over 400