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Kaspa
24-01-2008, 11:08 PM
well all you knowlogable people out there, what do we have to do to a 4G63 VR4 engine [presently stock] to acheive a reilable 300hp at the fly wheel.
any advice appreciated
cheers Kaspa
Kenneth
24-01-2008, 11:19 PM
well all you knowlogable people out there, what do we have to do to a 4G63 VR4 engine [presently stock] to acheive a reilable 300hp at the fly wheel.
any advice appreciated
cheers Kaspa

hi Kaspa, welcome to Club VR-4

This forum is dedicated to the 8th Generation VR-4 which has the 6A13 engine. As such, while there are no doubt a few people with 4G63 knowledge, most do not.

As for the 6A13, 300HP is usually achievable by simply increasing the boost to ~1bar/ 15psi.
CANDEE
25-01-2008, 02:09 AM
The best bet would be to have a talk to the guys on msport (http://www.msport.co.nz). They have had a lot of experience with them as many of them have 6g VR4's and ZR4's. There is also the owner of Envyit/Ezy10's :P
bradc
25-01-2008, 07:46 AM
they are able to handle that just fine, up the boost and you'll be away laughing
Paul Beazer
25-01-2008, 01:43 PM
I thought older VR4's (6G / 7G) were 6 cylinders?? No?
Nick Mann
25-01-2008, 02:31 PM
The 7g is a 2.0 V6 TT. (6A12TT) The 6g is a 2.0 I4 T (4G63T).
Turbo_Steve
25-01-2008, 07:06 PM
4G63T - Turn the boost up to 0.9Bar.
As long as the ringlands hold out, you should see something approaching 300bhp if your airfilter and exhaust are any good.
Early Evos with same engine can have ringland problems once you defeat the fuel cut.
MarkSanne
25-01-2008, 10:10 PM
There is a huge amount of info on these motors on the australian 6G VR4 forum: http://www.galantvr4.org.au/public/index.php

(I happen to be very interested in those engines as well, as I'm into converting my other Galant -a 6G GTi- into a 6G VR2 (front wheel drive only, just like my 8G VR2)
Kieran
26-01-2008, 01:08 AM
As long as the ringlands hold out, you should see something approaching 300bhp if your airfilter and exhaust are any good.
Early Evos with same engine can have ringland problems once you defeat the fuel cut.

That's interesting - on the engines in the UK that have blown through detonation, this is the part that's let go first in most cases!
Wodjno
26-01-2008, 01:37 AM
That's interesting - on the engines in the UK that have blown through detonation, this is the part that's let go first in most cases!

Isn't that what Steve said ?
Kieran
26-01-2008, 01:45 AM
Isn't that what Steve said ?

Yeah, but he was on about the 4G63T above.
Wodjno
26-01-2008, 01:55 AM
Yeah, but he was on about the 4G63T above.



That's interesting - on the engines in the UK that have blown through detonation, this is the part that's let go first in most cases!

Sorewee :D

You didn't specify that you mean't 6A13 only :scholar:
Turbo_Steve
26-01-2008, 01:57 AM
That's interesting - on the engines in the UK that have blown through detonation, this is the part that's let go first in most cases!

Do you mean the 6A13TTs have the same problems as the early 4G63Ts?
i.e. above certain boost levels, the ringlands seem to let go. If they manage to survive, then it's the rods.

It's not unusual for a manufacturers engines from the same period to exhibit the same weakness. I don't doubt these projects get led by a single bloke with certain ideas which get carried across the range. Or maybe he just does pistons & rods! LOL
Kieran
26-01-2008, 02:03 AM
Do you mean the 6A13TTs have the same problems as the early 4G63Ts?
i.e. above certain boost levels, the ringlands seem to let go. If they manage to survive, then it's the rods.

That's to the letter what we've seen!
Turbo_Steve
26-01-2008, 04:07 PM
Christ, I hope there aren't any crankwalk problems!
The cheapest fix for the old 4G63T is using pistons and rods from a later one (e.g. mine has pistons and rods from an 8) so goodness knows what'd go in a 6A13TT?
Kieran
26-01-2008, 06:46 PM
Christ, I hope there aren't any crankwalk problems!
The cheapest fix for the old 4G63T is using pistons and rods from a later one (e.g. mine has pistons and rods from an 8) so goodness knows what'd go in a 6A13TT?

Nah, we've not had them suffer from that. Neither have we had them spin the main bearings like the 6G72TT seems to like to do (according to a lot of US sites).
Turbo_Steve
26-01-2008, 09:07 PM
I'm relieved there is no crankwalk issue: it's seems to be a demon of a problem in the early evos.

The later piston fix was for the ringlands, not the crankwalk (which is new bearings with an extra oil-feed from what I gather).

I keep starting to get interested in going internal on the 6A13, but it's so expensive on a unknown engine with 6 cylinders, and it seems to be able to reach 400bhp flywheel without having to open it up. So I can't see the need.
500bhp would rock, but it's just too much to spend (for me) on what is essentially the family runabout.

I must be growing up! OMG!!!!