Maintain, Modify and DRIVE your GT-Four

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 Post subject: Tuning
PostPosted: Sun Apr 03, 2016 7:01 pm 
Junior WRC
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Joined: Sun Sep 24, 2006 7:19 pm
Posts: 563
Location: Basingstoke
Car Model: ST185
http://www.scoobynet.com/projects-40/10 ... -time.html

Thought I would post up this link (if you don't mind ) ? Its not about gt4's or even Subaru's , and its a heavy read . But for the petrolheads I think its both interesting (you decide) and informative ?

2004 Subaru WRX

 Post subject: Re: Tuning
PostPosted: Mon Apr 04, 2016 9:17 am 
Club Staff
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Joined: Wed Jul 13, 2005 6:54 pm
Posts: 3477
Location: On Top
Car Model: None
I haven't been through the whole thread yet but the snippets so far I have found quite interesting are based on the Mercedes A45 AMG specs.

2.0 litre turbo
Fully forged engine from the factory running 1.8 bar from the factory! 381 bhp & 350 lb/ft torque.
8.6:1 CR and running what we would call quite lean (11.8:1 AFR @ 1.8 bar!)
350 lb/ft available from 2250rpm through to 5000 rpm where it tails off a bit to 6700rpm redline and kept pretty constant by varying boost pressure (at high rpm they run 1.8 bar but it is lower at lower RPM hence the peak torque is still only circa 350 lb/ft)


Borg Warner B03 twin scroll turbo with journal bearing! and billett compressor wheel (more suited for high boost application) Compressor wheel is 62mm and suggested to be similar/same as EFR6258 compressor.
83.0mm bore x 92.0mm stroke.

So far an ECU, cat removal and induction has released more low torque and upped BHP to 430-450 ish which is suggested as being the limit of the turbo.

It would be lovely to find a bit more about the turbo specs to see what could be done with an EFR6258 twin scroll on a high boost 3sgte.

GT4DC Treasurer

Grey St185 RC
Silver BMW E46 M3
Multicolour yawn Honda VFR400
Silver Honda Civic Type-R

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