2JZ conversion experts - your insight please!

[pwpanas]

Originally Posted by Johnny A

yeah sorry it is a 2JZ-GTE TT lump.

So the V160 manual box is what I need, does the manual really have it's own ECU?? can't see why it would!!!!

It's already running just shy of 400bhp from less than 1 bar of boost, will know more once I go to see it this sunday.

I have a Go-tech programmable ECU (a universal one, not 2JZ specific) which I am tempted to use. I think 400bhp would be good for a while, but you know what it's like - you get bored and want more! No more than 600bhp though.

No, the V160 is not shifted by the ecu, but the auto tranny is. Since I didn't know what you were starting with, an auto->6spd swap generally requires an ecu change because the ecu no longer shifts the transmission.

For 600bhp the oem 2jz-ecu Mkiv Supra Turbo ecu would work just fine.

[Johnny A]

Will the engine ecu have any issues once I take away the auto box's ecu?? On the vauxhalls it's simply a case of earthing a pin on the engine ecu to tell it the gearbox is manual.

I'm glad to hear the factory ecu will be happy with 600bhp, if we ignore the obvious turbo, exhaust and intercooler upgrades what else would be required to achieve 600bhp? The engine already has a fuel cut defencer (hks).

[pwpanas]

Originally Posted by Johnny A

Will the engine ecu have any issues once I take away the auto box's ecu?? On the vauxhalls it's simply a case of earthing a pin on the engine ecu to tell it the gearbox is manual.

I'm glad to hear the factory ecu will be happy with 600bhp, if we ignore the obvious turbo, exhaust and intercooler upgrades what else would be required to achieve 600bhp? The engine already has a fuel cut defencer (hks).

Again, you'll need to swap out the auto ecu for a 6spd ecu. They are two different Toyota part numbers.

For 600rwhp, you'll first need to decide what kind of fuel you want to run (pump gas alone won't work):
- pump gas with a heavy shot of methanol?
- race fuel (104+ motor octane)
- E85?
- any other ideas?

[Johnny A]

We have 99ron pump gas here is the UK But to be honest I plan to run this all the time anyways as it's a JDM import. If that's not enough I could put a little methanol in there too, I am a fan of water/meth injection.

I am still confused as to why a manual gearbox has it's own ECU though

[pwpanas]

Originally Posted by Johnny A

We have 99ron pump gas here is the UK But to be honest I plan to run this all the time anyways as it's a JDM import. If that's not enough I could put a little methanol in there too, I am a fan of water/meth injection.

RON is not MON. You need to find out the MON of that 99RON gas...I'd guess that it's about 89MON. This is only good for about 16psi of boost, max, using the oem Mkiv ecu. In other words, yes, you'll definitely need to supplement with methanol injection to make 400+rwhp. To make 600rwhp, you'll need a very heavy shot of methanol - the biggest kit you can find should do the trick.

Originally Posted by Johnny A

...I am still confused as to why a manual gearbox has it's own ECU though

Sigh. The manual gearbox does not have its own ECU. There's a different ECU for the MKIV Supra Turbo depending upon which transmission it has. Hypothetically speaking, if you already owned an Mkiv Supra Turbo with an auto tranny and you decided to convert it to a 6spd, you'd have to swap out the primary ECU. Make sense?

To make 600rwhp+, you'll need an aftermarket fuel controller (eg. an A'PEXI AFC Neo), and a small-medium single turbo kit (eg. 57+mm inducer). The oem twins can't make 600rwhp. Be sure you're running Toyota's 550cc injectors (your j-spec 2jz-gte probably came with 440s, so you'll have to swap them out). Together with the meth kit, you'll have enough fuel for 600rwhp, but just barely. For additional safety, I'd recommend an aftermarket fuel pressure regulator, and bump it up to about 50psi base.

[Johnny A]

I understand about the ECU's now, also regarding the fuelling issues at higher powers (the need to up the octane rating) and the need to change the ECU to a manual version I think it would be better for me to use my aftermarket Go-tech Pro-X ecu and cook a loom up using the plugs etc... from the aristo engine loom.

I know this might not sound the easiest solution if it were a 2JZ in a supra but remember this is going into a totally foreign car where nothing is going to be directly compatible, plus the Go-tech gives me tons of options and its totally future proof for upgrades. I am getting pretty good at mapping too

I have actually just returned from going to see the car itself, I have known the owner for years and drove the car itself about 4 years ago so I knew what to expect.

It hadn't been turned over in 3 months, with a quick jump start it started and idled as if it was new!!! The only thing wrong I could find was the valve stem oil seals are leaking oil when the engine is cold so you get blue smoke on startup, I have heard this is a fairly common problem with these engines. Would new seals from Toyota cure the issue??

[pwpanas]

Originally Posted by Johnny A

...The only thing wrong I could find was the valve stem oil seals are leaking oil when the engine is cold so you get blue smoke on startup, I have heard this is a fairly common problem with these engines. Would new seals from Toyota cure the issue??

Yes. Here's the tech article:
http://bellsouthpwp2.net/p/w/pwpanas...ra%20Turbo.htm