Stiver3

Hi,

After my recent RR day, i'm looking to up my torque. I've read around and searched scoobynet and found out that headers generally are the way to get torque up without spending big money!

And gruppe S are doing them for £250 i think shipped on a GB.

But i need to clear a few things up before!

Firstly, what torque gain should i be expecting if any? not bothered on hp, but a bit more torque would be nice.

Is it worth buying the up pipe aswell? and is wrapping them a worthwhile process?

Lastly, i wont these to be a bolt on mod, and dont want to have to uprate/ map anything after i install them, is this possible?

If anyone can suggest anything else, would much appreciate it!

Thanks

banny sti

iTrader: (68)

It is worth getting the uppipe too as the standard one is quite a small and restrictive, wrapping the headers and uppipe is a must as it keeps under bonnet temps down and aids turbo spool.

You will gain about 20bhp and 25 lb/ft of torque but most of this power will be higher up the rev range. Your off boost performance will be affected in a negative way due to the lack of torque made lower down.

Also expect your turbo to spool up about 300-500 rpms later, to get the figures mentioned above you will need to get the car remapped.

hope this helps banny.

Stiver3

Rite, thanks banny.

So just doing headers on there own without an up pipe or remap is not worth it?

If wrapping is a must aswell, i will consider doing that.

Im not really looking for any more BHP as 320Hp is more than enough at the moment untill i look to a new turbo etc...but torque would be nice, anymore suggestions for getting that up?

Thanks

Stiver3

banny sti

iTrader: (68)

Unless you willing to get the car remapped, i would not bother with aftermarket headers.
You are better off getting ported standard headers from Harvey, you will get great improvements in all areas without the drawbacks of the aftermarket headers.
Wrapping is a must due to the reasons mentioned above. As for getting the torque up, you could try running more boost lower down using an electronic boost controller.

regards banny

911

IMHO Banny is spot-on with his suggestion.
The Gruppe s headers are great, but will only yeild what you want with a bunch of supporting mods as a total bolt-on package.

If you are REALY interested in this topic and the detail please take a look at my monster thread in Projects. The first few pages will get you thinking.

Graham

Stiver3

Hi,

Thanks for the replys, 911 i've read your thread and had been most interesting, but im not ready for the whole, new turbo etc...yet, i'm looking for a quick, cheapish solution. And it seems that headers only work properly when mapped.

As for gaining torque using an electronic boost controller, could anyone advise me on a good one, and what benefits i should expect from it?

Sorry for asking so much, but i determined to solve it!

Thanks

Stiver3

SCOOBYD00

Mine are going on next week with the FMIC. heat wrap was pricey @ £50 for 50ft but should do the job. We will see... RR day in a week or two so be able to judge then.

Stiver3

Hi 'scoobydoo'

Are you getting it remapped aswell when you put your Frount mount & headers on?

Will be good to see the difference

Stiver3

banny sti

iTrader: (68)

sti ver3, i have similar mods to your car but in additionn i also have an apexi avc-r boost controller.
The car is due to be mapped by jolly green monster (simon) in october and i will see if the torque figures are any better than yours.

SCOOBYD00

Got Link @ the moment but looking to go Apexi with AndyF, getting mods done then possibly blower & injectors when I get the Apexi fitted.

911

In my limited experience, the Apexi FC and Andy's magic mapping will be a great way to sort the car. Andy likes flowed cast iron headers too!
Good luck and keep us informed, always interesting.
Graham.

Stiver3

Yeah will do, thanks for everyones help! I'll see what i can do....

Stiver3

After loooking around at some turbos, for maybe a future upgrade, because my VF23 will max out @ 350BHP. I've heard that the VF22 can max out @ 400-450BHP Which to me sounds to high!, is there any truth in this??

Tone Loc

iTrader: (1)

No, none at all if its a standard VF22 and not a hybrid of some sort.

Tony.

SCOOBYD00

A simple remap may well change the cars feel TBH... and I did consider doing that but opted to do a couple of bolt-ons first before going to AndyF. Interesting to see how much we can get out of the VF28.

SCOOBYD00

450...?! If thats the case swap you!
Found this..

VF22 BB, PZ20 ex.h/48.5mm c.h/5b c.w/0.71 A/R - JDM MY96 V2 STi / 1998
VF23 BB, PZ20 ex.h/46.7mm c.h/7b c.w/0.71 A/R - JDM MY97 V3 STi / 1998
VF24 BB, PZ18 ex.h/46.7mm c.h/7b c.w/0.63 A/R - JDM MY98 V4 STi
VF28 BB, PZ18 ex.h/46.7mm c.h/7b c.w/0.63 A/R - JDM/OZ MY99/00 V5/V6 STi
VF29 BB, PZ18 ex.h/46.7mm c.h/7b c.w/0.63 A/R - JDM MY00 V6 STi
VF30 TB, PZ18 ex.h/47.9mm c.h/9b c.w/0.63 A/R - JDM MY01 V7 STi
VF34 BB, PZ18 ex.h/47.9mm c.h/9b c.w/0.63 A/R - JDM V7 STi RA Spec C
VF35 TB, PZ15 ex.h/47.9mm c.h/9b c.w/0.51 A/R - OZ/UK MY03-05 STi
VF36 BB twin-scroll - JDM MY03 V8 STi RA Spec C
VF37 TB twin-scroll - JDM MY03 V8 STi
VF39 TB, PZ18 ex.h - US MY04 2.5L STi

BB = Ball bearing
TB = Thrust bearing
ex.h = Exhaust housing
c.h = Compressor housing
(x)b = (x) bladed compressor wheel
c.w = Compressor wheel
A/R = Area to Radius turbine housing ratio
JDM = Japanese Domestic Model

Stiver3

Interesting table that!, I did doubt a little about the 400HP+, i know its one of the larger classic turbos but not that large!!

Is the VF28 rated @ 350HP Max then??

SCOOBYD00

Well as standard it run circa 300bhp on my STi so I would not imagine 350 would be possible.