True!

 

Hence your torque is much bigger than BHP and mainly spool is totally different to 2.0L

Still great result on yours



Jura

 

Yep. Major difference is torque really. Will always get more with the 2.5. Great turbo though, brilliant spool up on mine!

 

what are the symptons of a cracked housing,performance,noise or cosmetic?

 

I am going down the straight through 3" route mate, i wanted to try and keep my current system as it sounds great but the need for more power is greater

 

Exhaust may sound different once you change the turbo. Mine did!

Symptoms of cracked housing not really noticeable until you take the turbo off. Mine has very bad crack in wastgate housing where the penny seals, so may have limited the boost it will hold. That’s it really.

 

3" bellmouth decat tapered to 2.5" to match the rest of system will be your best bet with the vf48. 3" straight through may give you a few more bhp at top end, but at the expense of spool-up and midrange (which is more important) .

As long as your Genome back box is 2.5" all the way thru it will be fine, don't bother changing it.

 

How do you post up pdf's as i have the graphs scanned and emailed to me??

 

Try this:

Go Advanced-> scroll down and there is Manage Attachments



Jura

 

The file is too big and i am useless at trying to make files shorter lol

 

You can make PDF smaller unless you have Adobe Reader Professional or Open Office with PDFImport extension.

How is big?


Jura

 

Well the file 993kb and snet limit is 934kb.

 

Cheers jura

 

Its OK there,happy to help

341bhp and still think there is reserve for further increase in BHP




Jura

 

Not to impressed wth mine today.... less then the VF35 I took off
332.8/312 but feels to pull better than the the VF35
Main mods - MY03 STi
VF48
3" decat
HKS filter
FPR



Also had a WRX with almost the same set up (plus FMIC) hitting a little less....
Confused dot com

 

What boost is it running? mine hits 1.5 around 3.6 prm and drops to 1.2 after 6k rpm. My injectors are at 93-94%.

My mods are-

Vf48
Walbro 255
harvey uppipe
panel filter
3 port
ngk 7b plugs
17-18% meth
2.5 sportscat with a standard centre section.

 

1.35 max at 5100rpm so a little low but nothing major....
Fueling was fine aswell.... just didn't get the numbers I expected as it feels stronger to drive

 

Who mapped that Scotty? 1.35 bar seems really low? Cracked wastegate? The VF48 I was going to get fell through..

 

Speak to S10WRC on here as he has a few VF48's with low delivery miles

 

What price are they going for these days? This thread is not helping the re-sale value
I suggest you both get in touch with Duncan Dynamix the VF48 specialist! Mine made more power on V power on a notoriously lower reading dyno than both of you.

 

what is your spec AbbasSTI?

 

Scratch that, i just checked your garage i think the only difference between both cars is my meth mix and you have Gt spec headers, straight thru 3" system and using 650 injectors..

 

 

2003 UK STI
VF48
3inch decat
255 walbro
3 port
FPR
FMIC
@1.4bar
on Tesco 99
mapped by Enginemapper

 

Nice result!

 

sorry if this is a stupid question but what does a cracked wastegate sound like?

 

just fitted my 06 wrx 2.5 with vf48 had it mapped tuesday it *** out with 355bhp an 408ft lbs torque.

kev

 

That’s a great result! Very nice!

What other mods do you have to get that?

 

It wont make a noise or sound any different to normal anyhow. My VF48 has a crack in the exhaust housing around the wastegate penny. The crack will very unlikely ever crack right through so doesn't make too much of a difference. May effect the max boost the turbo can hold, but thats about the only drawback. Still drives great!

 

sti top mount.full de-cat.headers.vf48.an fuel pump.thats about it.still on the standard injectors cus they 565cc 15 cc more then the sti's,