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Underbody braces, turbos and more!

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PostPosted: Fri Sep 03, 2010 4:14 pm 
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Joined: Mon Sep 22, 2008 8:39 pm
Posts: 75
Location: Florida, United States
Well after driving a turbo G10 automatic for some time now, I came across a 89 gti in great shape. I bought it without hesitation for $700. Paint is fantastic, interior is in better than average shape. The only problem, it has the "slushbox" 3 speed automatic.....bummer. But hey, I have a turbo auto g10...so now for a turbo auto g13 till I can find a 5 speed gti.

Since I am new to the GTi engine(even with the factory service manual) I do not know what the stock fuel table is good for.
Compression wise, #1-150 #2 150 #3-18- #4- 120......So I know I am gonna have to open the engine to re ring & valves ets... I am debating on boring the block to 75 and using 8.5 vitara pistons, or ordering the 74mm 8.5 from suzukird so I can leave the engine in the car. I will also get cams from Mike

What is a decent boost range that the stock ecu can handle?

thanks!


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PostPosted: Sun Sep 05, 2010 2:10 am 
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Joined: Mon Mar 14, 2005 10:19 am
Posts: 361
Location: Canberra, Australlia
Stock compression is 206 with limit of 156psi so yes a bit too low.

Using vitara pistons quite common but drops your compression quite low (bit sluggish off boost). Other people have used Jimny pistons. Standard engine in good condition can take around 6-7psi of boost no problem. I have standard engine with around 70,000km's on it running between 7-11psi. If you change oil regularly and look after it should be fine.

Standard ECU you can get chips which are OK for up to around 7-10psi boost (depends on turbo size as to how much boost you can usefully use). No point pushing more air in as it wont give you more power. Eg. Garndi chip (username) common in Australia. Can get these from gtaye on redlinegti.com.

Once you head past this mark things start to get expensive as gearbox (diff and cwp), clutch, fuel pump etc are all at the limit so is big step up from there to all these bits plus aftermarket ECU (let alone all the extra bits like LSD to get power to the ground).

_________________
ImageET 13.138 at 120.2mph


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PostPosted: Sun Sep 05, 2010 8:34 am 
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Joined: Mon Sep 22, 2008 8:39 pm
Posts: 75
Location: Florida, United States
Thanks Grape!

I guess re-ringing the pistons are in order as well as a valve job. I know what you mean about sluggish off boost, my G10 turbo is that way and it sucks! Maybe because the turbo is way to big, hence why I am swapping a gt15 in today........

Robert


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