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-==L=a=N=c=E==- Forums Junkie Location: Brisbane, Queensland Registered: January 2004	Re: GT4 modification and performance ... Fri, 20 May 2005 23:03 RWDBoy -> Here are some pictures for you, mull them over, and compare them to a Gen1. Head: http://ugbox.net/~lance/GT4/Repair/Engine/removed. JPG The Head... the extra ribbing is evident by the surrounds of the spark plugs. The Gen1 doesn't have these. Also changes around the cams and obviously the springs and valves for the higher lifting stock cams. I'm chasing up the flow data for both stock heads, gotta find my resource again. Oil Cooler: http://ugbox.net/~lance/GT4/Repair/Engine/oilcoole r.JPG This is the oil cooler on a Gen2. Its much more efficient then the one found underneath the manifold on the Gen1. Pistons: http://ugbox.net/~lance/GT4/Repair/Engine/pistons- l-r.JPG Really a null point since u've said that the Gen1 pistons are inferior... unlike what you were implying before. Crank: http://ugbox.net/~lance/GT4/Repair/Engine/crankrem ove.JPG Now the changes in this area are the larger oil feed holes. Also the bearings i believe (i ahve to double check this with the ACL bearing guide) are wider. Block: http://ugbox.net/~lance/GT4/Repair/Engine/nakedblo ck.JPG The naked block, I'm chasing up pictures to compare to the Gen1 block. We'll get back to this. OilPump: http://ugbox.net/~lance/GT4/Repair/Engine/oilpump. JPG This is a Gen2 oil pump. Nothing notably evident in this picture, but if you flip it over, there is a larger recess made for the higher flowing pump. Now, Aside from the engine, lets look at all the other support systems. -The intake manifold is much the same, the Gen2 having a larger plenum. A minor difference. -The Gen2 uses sidefeed injectors as opposed to the Gen1 top feed injectors. -The Gen2 has the twin entry turbo, the Gen1 has the single entry. Not a major difference, mainly in spool speeds. Now, the breakdown for the rebuild. -Forged pistons $900 (or if you look around, they sell 2nd hand for $200...) -oil pump is $150 -water pump is $150 -Seal kit from toyota (or another source for 1/3 the price) $300 -O-Ring each cylinder is around $100 each -Copper headgaskets, are around $200 (i think, i went MLS for $160) -Bearings is around $200 Its adding up, even with trade discounts, it isn't gonna be under the $1500 rebuild budget. Even if you went with Gen2 pistons, they are $150 each from toyota(trade). Of course depending on how dodgy you want to be and what you reuse etc. I didn't account for a head being rebuilt in there. So it'd be more again.... No labour either. No machining workin there either, so probably a few hundred bucks in labour as well. To me, a swap to a Gen2 is a much better idea. Gen2 halfcuts can be had from around the $1500-2500 bucks depending on condition of course or who you know. Upgrade the headgasket and head studs (thats around $400) and pop it all in. It does fit in the ST165, this guy has done it and documented it. http://www.gtfour.ca/howtoswap.html [Report message to a moderator]

	Subject	Poster	Date
	GT4 modification and performance ...	carsanactra	Sun, 15 May 2005 02:24
	Re: GT4 modification and performance ...	Classique71	Sun, 15 May 2005 02:32
	Re: GT4 modification and performance ...	RWDboy	Sun, 15 May 2005 03:56
	Re: GT4 modification and performance ...	RWDboy	Sun, 15 May 2005 04:04
	Re: GT4 modification and performance ...	Toobs	Sun, 15 May 2005 04:21
	Re: GT4 modification and performance ...	berad	Sun, 15 May 2005 04:38
	Re: GT4 modification and performance ...	carsanactra	Sun, 15 May 2005 05:25
	Re: GT4 modification and performance ...	RWDboy	Sun, 15 May 2005 07:00
	Re: GT4 modification and performance ...	berad	Sun, 15 May 2005 08:03
	Re: GT4 modification and performance ...	StuC	Sun, 15 May 2005 08:33
	Re: GT4 modification and performance ...	ralfross	Sun, 15 May 2005 08:56
	Re: GT4 modification and performance ...	-==L=a=N=c=E==-	Sun, 15 May 2005 09:15
	Re: GT4 modification and performance ...	Classique71	Sun, 15 May 2005 12:08
	Re: GT4 modification and performance ...	carsanactra	Sun, 15 May 2005 12:28
	Re: GT4 modification and performance ...	Classique71	Sun, 15 May 2005 12:37
	Re: GT4 modification and performance ...	RWDboy	Sun, 15 May 2005 14:45
	Re: GT4 modification and performance ...	berad	Mon, 16 May 2005 07:26
	Re: GT4 modification and performance ...	carsanactra	Tue, 17 May 2005 02:57
	Re: GT4 modification and performance ...	justcallmefrank	Tue, 17 May 2005 03:15
	Re: GT4 modification and performance ...	Classique71	Tue, 17 May 2005 08:21
	Re: GT4 modification and performance ...	justcallmefrank	Tue, 17 May 2005 08:25
	Re: GT4 modification and performance ...	Classique71	Tue, 17 May 2005 08:57
	Re: GT4 modification and performance ...	berad	Tue, 17 May 2005 09:27
	Re: GT4 modification and performance ...	carsanactra	Tue, 17 May 2005 12:42
	Re: GT4 modification and performance ...	RWDboy	Tue, 17 May 2005 16:02
	Re: GT4 modification and performance ...	RWDboy	Tue, 17 May 2005 16:11
	Re: GT4 modification and performance ...	berad	Wed, 18 May 2005 09:42
	Re: GT4 modification and performance ...	RWDboy	Wed, 18 May 2005 14:43
	Re: GT4 modification and performance ...	-==L=a=N=c=E==-	Thu, 19 May 2005 08:34
	Re: GT4 modification and performance ...	RWDboy	Thu, 19 May 2005 14:12
	Re: GT4 modification and performance ...	-==L=a=N=c=E==-	Thu, 19 May 2005 21:46
	Re: GT4 modification and performance ...	berad	Fri, 20 May 2005 02:57
	Re: GT4 modification and performance ...	berad	Fri, 20 May 2005 02:59
	Re: GT4 modification and performance ...	carsanactra	Fri, 20 May 2005 03:13
	Re: GT4 modification and performance ...	RWDboy	Fri, 20 May 2005 03:17
	Re: GT4 modification and performance ...	berad	Fri, 20 May 2005 03:19
	Re: GT4 modification and performance ...	berad	Fri, 20 May 2005 03:23
	Re: GT4 modification and performance ...	RWDboy	Fri, 20 May 2005 15:33
	Re: GT4 modification and performance ...	-==L=a=N=c=E==-	Fri, 20 May 2005 23:03
	Re: GT4 modification and performance ...	Toobs	Sat, 21 May 2005 13:11
	Re: GT4 modification and performance ...	RWDboy	Sat, 21 May 2005 01:36
	Re: GT4 modification and performance ...	-==L=a=N=c=E==-	Sat, 21 May 2005 04:49
	Re: GT4 modification and performance ...	-==L=a=N=c=E==-	Sat, 21 May 2005 13:45
	Re: GT4 modification and performance ...	RWDboy	Thu, 23 June 2005 14:37
	Re: GT4 modification and performance ...	-==L=a=N=c=E==-	Thu, 23 June 2005 21:34

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