1jz?? What is the weak point?

[neal]

Its a toyota there are no weak points.

As said before it all depends on the tuner, if you do a very thorough search "google is your frined" you will find people running around 600hp or so in standard form.

There is a reason why people are finding it hard to answer you querstions directly because 1jz/2jz are pretty much bullet proof.

You can also ask a question slightly diffrently. Can i make xxx hp with a standard 1jz.

There are also known faults ECU caps, ignition system and crank angle sensors.

[duggy]

ok then some more questions can i make 550hp on pump

can i make this on a standard head

what are the coils and igniter like will i need to up grade these

any other suggestions on what mods might be required for making this sort of power

[IN 05 NT]

yes,

yes,

coils are aparently better then aftermarket (perforemance....direct replacement style).....so ive read,

dont know bout the ignitor tho.

[duggy]

does any one have links to any cars which have done this?

[Stomps]

Its a toyota there are no weak points.

As said before it all depends on the tuner, if you do a very thorough search "google is your frined" you will find people running around 600hp or so in standard form.

There is a reason why people are finding it hard to answer you querstions directly because 1jz/2jz are pretty much bullet proof.

You can also ask a question slightly diffrently. Can i make xxx hp with a standard 1jz.

There are also known faults ECU caps, ignition system and crank angle sensors.

1jz/2jz are certainly not bulletproof... not by a long shot...

yeah they are great motors when looked after, but as they get older problems are beginning to show...

recently..
i went to put cams in my never opened, factory 1j... turns out the head gasket was blown, head was warped... this was a 90,000km motor... now in fairness i dont know how the previous owner treated it.. but it still had factory turbos, so it couldnt have seen too much boost..
upon further inspection- 3 of my rods were .2 of a mm shorter than the other 3... from factory.. motor never opened..
also, one of the core plugs wasnt sitting in properly... from the factory...

another case...

a mate of mine bought an aristo... 80,000km on the clock.. motor never opened and dead standard... head gasket was blown, bit of damage to one of the bores...

i know these may be isolated cases... but every motor has weaknesses.. it comes down to not being a spastic with boost and having a good tuner...

Stomps

[Dieseltrain]

ALot of guys on Pump fuel 98 octane running Octane booster find 20-24psi about the limit . Depending on manifolds and such, 400-500hp is achievable on pump fuel with a Bog stock 1JZ . More can be made with race gas and a decent tuner .

Ignition, You may want to look into a HKS Dli if your finding spark is blowing out .These can be wired into the factory ignition system and use the stock igniiter .

I reckon we should charge for these answers,lol....

[duggy]

I reckon we should charge for these answers,lol....

hahaha these answers are much appreciated.

anymore info from anyone?

[Pimpin_1JZ]

At what psi does the T78 come into it's own?

[duggy]

lol again i dont no car is yet to be tuned im not drivin it till its tuned

[1JZ.747]

how much power did u make ?

dyno read 504rwhp through the auto, but to run 137 mph at thayt wieght indicates it was more like 680

[1JZ.747]

yeah its yet to be driven needs a tune and also i have yet to have my question answered wat is the weak point in 1jz's

i answered it idiot tuners trying to run to much boost on crappy fuel.

if you research this forum hypo77 of matt gilmer is the next fastest 1j, he had cams and a manual in a light car, from memory he made aorund 540rwhp on pump with a 66mm turbo with some toulene form memory, he had an engine faliure which i felt was pushing too far on pump fuel.

basically when you go to far its either going to melt a piston or break a rod.

kade and jak have broken a couple of motors and from memory they were rods. im not saying i know all here by any means, but the common denominator between my motor going for so long versus every one else was fuel and tune i believe, mine always ran a bit fat in the tune.

i didnt like the factory coils, i went for bosch coils and made 40 or so extra horsepower with them yet other people have no issues with them.

too many variables, doing your own R&D is the best way to answer your question

[Pimpin_1JZ]

lol again i dont no car is yet to be tuned im not drivin it till its tuned

Surely you did a bit of research on turbo efficiency ranges when choosing a new turbo?

I too have blown a few engines, 2 have been because of oil issues, the other is tune related. I'm pretty sure my tuner had a bit too much timing. But like I said previously, stick to 19/20 psi and you won't have any problems.

[JZA70 R]

you could run 19/20 psi on a shit tune for an hour and smoke a motor. you could also run 25psi on a smart tune for years and not have a problem so i wouldn't use manifold pressure as a safety net. again it all comes down to the tune. regardless of boost (to an extent)

[ecko]

i guess aswell being metal head gasket would mean that its less likely to pop a head gasket
meaning more internal damage ...
ie normal gay nissan motors you run to much boost the HG pops u stop...
but JZ's you run to much boost the head gasket doesn't pop you keep going then major internal damage done.... a victim of its own overengineering...
sounds about right guys?

[EldarO]

mine popped a HG.


gay.