VVTI or not

[dkabab]

ok so i'm planning a conversion with a 1jz motor. the car will have an auto transmission, weigh about 1550kg. what i plan on doing is leaving the engine pretty much in stock form. standard turbo(s), internals etc. dont want to go over board.

what i plan on doing is the following.

intake
dump pipes + exhaust
FMIC
up the boost/ecu - 12 - 15 psi at most
possibly rebuild/highflow turbo(s)

looking at maybe 200+ rwkw. dont NEED 250+
any ideas what those mods would net on each motor... would one respond better...
what i want to know is will i better off with the vvti with single turbo, or are there more gains to be had from the non vvti twin turbo version due to its large exhaust restriction.

car will be used for cruising, no drags, no racing, just cruising mainly. so drivability is a big concern.

i have done a bit of research on here but havnt found much like this.

thanks

[Joshstix]

You'll make more power with the twins but the vvti engine feels tougher from down low and would make a better cruiser.

["Z" UTE]

dkadab, the VVTi engine runs slightly higher compression, and as Joshstix says they are really great pulling engines. I accidently took of in 4th gear from a standing start, and the engine did not complain one little bit.

Reasonable size FMIC, and some larger intake pipes in alloy coupled with a 2.5 inch povo pressbend exhaust, and she spun the rollers at a healthy 189rwkw, with standard boost and stock ECU.

For comparison there was a difference of only 5kw between a late model Soarer with VVTi single, and an Aristo 2JZ-GTE twin at our last dyno day. Both auto's.

1550kg car, what is it, a luxo barge?


cheers Chuck.

[Norbie]

For a car of that weight I'd seriously consider the 2JZ instead. Price is very similar to a VVTi 1JZ, it has oodles of torque (the extra 500cc makes a big difference), and will do well over 200rwkw with just a bleed valve. Being an auto makes it a no-brainer IMO.

[The Real Roadrunner]

id have to agree with norbie on this one.

the price difference between a 2jz-gte from an aristo and a 1jz-gte with VVTi is minimal but the difference in driving the 2 is huge. there may only be 5kw difference up top on a dyno graph but the difference at 2000rpm (where you will spend most of your time) is massive.

the only downsides to the 2jz is where the rear turbo sits and the more complicated wiring. tailshafts can be more of a hassle also.

cheers
linden

[Mos]

Another vote for 2JZ. Mine made 222rwkw completely stock with a 3" exhaust and cooler on factory boost. In terms of driveability it's like night and day - the 2JZ is so much more of a lazy engine and makes a lot more useable torque at lower revs.
Find some cressidas with different engines and take them for a drive. It will give you a better idea of the differences than any amount of people rambling on a forum
Mos.

[dkabab]

yeah i did concider the 2jz, but im not sure if its too tall or not to fit into the car. its a 1993 Eunos Cosmo anyone got height dimensions? from sump upwards. do they come with rear sump? or can you fit a 1j rear sump to it?

[The Real Roadrunner]

yeah i did concider the 2jz, but im not sure if its too tall or not to fit into the car. its a 1993 Eunos Cosmo anyone got height dimensions? from sump upwards. do they come with rear sump? or can you fit a 1j rear sump to it?

2jz could be fitted but would need to be mounted as low as possible.

ill see if i can get some measurements of rob's 1jz cosmo and ill get back to you.

all sumps on the jz series can be interchanged (some need minor mods)

cheers
linden

[dkabab]

2jz could be fitted but would need to be mounted as low as possible.

ill see if i can get some measurements of rob's 1jz cosmo and ill get back to you.

all sumps on the jz series can be interchanged (some need minor mods)

cheers
linden

ummmmm you know someone with a 1jz cosmo...... HOLY SWEET! id love to get in contact with them if thats ok with them

[The Real Roadrunner]

autostyle prestige and performance cars.

talk to domenic russo or robert arbolino.

can't find his number but their website is http://www.autostyle.com.au

you may have to cut and paste it to the browser. edit: or not

[dkabab]

thanks a lot for that... did they do the conversion? i will definatly give them a call

[3sgte]

Here is some info on the difference between a 1JZ GTE with and without VVTi:
http://www.toymods.net/forums/showth...040#post455040

From the engineers that built it...

[The Real Roadrunner]

thanks a lot for that... did they do the conversion? i will definatly give them a call

not 100% sure, but they did have the engine out a few times so they should be able to tell you what was done.

it was an early TT engine also

cheers
linden

[dkabab]

thanks for that linden.

do you know much about the end result of the car? how it performs, what power figures etc... or do you just know of it

[whatthe?]

Give me a VVTi 1J any day over either twin turb 1J or non VVTi 2J.

It makes 373nm of torque by 2400rpm and a lazy 200rwkw with just an exhaust and cooler

If you don't want any more than 240 odd rwkw a boosted stock engine will get you there and it drives like a torquey NA engine with the standard CT15b turbo