Sunday, December 05, 2010 - 05:45 pm, by: Costa Tsimiklis(Driftshop)
Buy a 2JZ in GC for around $2500 and do a conversion.
If you can't afford that, simply buy a 1JZ in GC for $500-$1000 and install that. No point in spending money on rebuilding a 1JZ when you can upgrade to a 2J or just install a 1JZ on the cheap. Engine rebuilds are great in theory, but when it comes to the JZ range - good condition engine swapped in is all you need to get you going again.
Stock cams are a problem when looking at making power with any turbo upgrade, single or twin highflows - they are designed for emissions only and do not have a high enough lift or duration to flow in the top end. You can still make power, but the ceiling of this power will be limited to around 6000-6500rpm. If you turbo system can makem power in 7000rpm + - then you will benefit greatly from any after market cam upgrade.
If anyone is looking at rebuilding a 1JZ, For a cheaper cost, you can buy a 2JZ which can make 250-300rwkw on stock turbos in parallel mode, with the standard exhaust, cooler, boost controller mods.
Sunday, December 05, 2010 - 06:39 pm, by: Boris Siljanoski(Z2tt)
Costa what is the benefit though running 2jz in Parallel, when the 2nd Turbo comes on aren't they both flowing together and so the power potential would be the same ?
Monday, December 06, 2010 - 12:35 am, by: Harley Jones(Dvjzz30)
thanks for the info costa. there are several reasons im not wanting to go the 2j route. Here in nsw when you change the motor, to updated the details with the rta they require a fresh blue slip. One of these cant be obtained without an engineering cert, which cant be obtained without an IM240 test, this whole process can cost tens of thousands of dollars and take months. Something I am planning to do down the road. but certainly not something I want to try to undertake before everything closes for the end of the year. Another reason im looking at keeping the 1j is I already have a turbo, manifold, dump and everything built for the 1j, moving to the 2j id be looking at another turbo and refabbing bits and peices.
After having a chat to the boys at pbe we have basically decided to bore my block and throw a set of oversize slugs in, keep the stock rods, throw a new set of bearings in and slap a new head on it with a steel head gasket. Giving me a good chance to put a stronger clutch behind it all while im at it. when all is said and done I should be looking at fresh 2.7L 1j built, running and retuned with larger injectors for less than i can source a 2j for. I gotta say im happy with that.
Monday, December 06, 2010 - 09:53 pm, by: Ben Lipman(Ben12a)
I never had to do that in my cars (well the Rx-7 was engineered as I went from Carby atmo to efi turbo rotor). The other two just needed a blue slip done at a service station etc.
NT was the best ever rego change: I went to show them the engineering papers for the turbo rotor conversion, and they said "what do you need papers for, it's just a turbo"
Tuesday, December 07, 2010 - 12:26 am, by: Costa Tsimiklis(Driftshop)
Boris, the wastegate and split setup is not as reliable as it used to be when it was factory. Actuators become tired, the control system does not function as it used to when it was new. Most people see a gain in the top end when they run it parallel due to this fact. The sacrifice down low is a little noticeable, but it just feels like a soarer TT as it comes on boost, with that extra pressure from the 3.0L torque.
Harley, if you can do all of that for under 2.5k, its a good deal! I would have thought that machining and pistons would have at least cost around 2k + gasket + bearings etc.
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