Monday, February 13, 2006 - 11:15 am, by: Mark Paddick(Sparks)
Bottom end of N/A 2J is different...no oil squirters and probably different pistons. It should handle turbos OK if you don't work it too hard. Handle the extra compression by using less boost; turbo'd high compression motors really haul ass if the compression is kept up and boost kept down.
well i have got myself a 2jz-ge engine... i talked to the guys down at the supra forums and they think there is no point in turboing it... its either i get the head of my engine n try to mount it on the bottom end of the 2JZ or sell the 2JZ.. wat do u guys reckon?
Wednesday, February 15, 2006 - 06:49 am, by: Mark Paddick(Sparks)
There are heaps of tubo'd 2JZ originally N/A motors in the US SC300s so I don't know where the "there is no point in turboing it" comes from! Check the US sites.
Wednesday, February 15, 2006 - 09:29 am, by: Chris Davey(Chris_davey)
It seems that most of them use a thicker HG to lower compression.
I would do a 1.5jz if you have a 2jz-ge engine now. Then there will be minimal wiring issues as you are using the same head. You will need aftermarket ecu to compensate for extra capacity though.
I would suggest ringing Hardcore Racing in Slacks Creek QLD as these guys have done many 1.5jz's now and will be able to tell you exactly what you will need.
Wednesday, February 15, 2006 - 04:52 pm, by: Michael Keen(Jzz30man)
Steve, seeing you have a 2JZ bottom end, and you think your 1JZ head is OK, not cracked, then a 1.5JZ isn't a bad idea. Not cheap tho. I'd research what the US guys have done to turbo 2JZ-GE's but i believe its best to install forget pistons into the GE seeing you don't have the oil squirters like the GTE. Add up the bucks tho; - Forged Pistons and rebuild accordingly for the bottom end. Hmmm.... $2.5 - $3K (guess) - Metal Head Gasket $1K (educated guess) - ARP bolts $250 (educated guess) - Complete gasket set and seals (VRS) - $500 (guess) - plus bucket loads of other bits and labour, depending how much DIY your capable of. Hmmm.... makes a replacement 1JZ-GTE engine sound pretty cheap eh....??
Unfortunately, unless you have a big bucket of money, I recommend you sell the 2JZ-GE engine.
Don Bagnall Moderator New Zealand I have LESS Soarers than Hayden :-(
Wednesday, February 15, 2006 - 08:34 pm, by: Gareth Richards(Garethr)
As Mark said there seem to be plenty of turbo 2JZ-GEs in the US. The Boostlogic site -- http://www.boostlogic.com/parts_SC300.html -- claims that the N/A engine (with a thicker head gasket) will cope with 500+ bhp (370+ Kw) at the wheels. I suppose the main thing would be whether you could use the standard wiring harness with the 2JZ block / 1JZ head.
(Anyway, since the 3-litre engine is out of the car already, and the head is off to be replaced by the 1JZ, and the sump is off to be drilled and tapped for the turbo oil return, how much of a job would it be to fit low-compression pistons? Assuming, that is, that it's the pistons which lower the compression on the turbo motor. Actually, probably not worth the effort and expense.)
Then, as Michael said, there are the build costs, not to mention insurance, and would you have to obtain an engineer's report?
OK, used 1JZ it is, then
Don Bagnall Moderator New Zealand I have LESS Soarers than Hayden :-(
Thursday, February 23, 2006 - 12:32 pm, by: Greg Host(Ghost)
No do the 1.5 JZ. Its not that expensive. Cost me around $3000 all up including new pistons, fully rebuilt with new seals, bearing, rings, belts etc. Also that was including a replacement 1JZ head as my valves were damaged. The extra torque is well worth it.