1jz engine limits ???????

[whatthe?]

That's also what I thought,

Side by side pics / meaurements would be nice

I can measure an non VVTI rod if you want to measure a VVTI one

Cheers
Wilbo

I'll keep that in mind if and when I blow the engine up

[chris davey]

does anyone know for shure if a vvti head fits on a non vvti block and ifso what needs doing?

Does anyone know the answer to this? Someone with an EPC could check if they use the same headgasket?

I would think that they would be interchangable as the block is still the same AFAIK so you wouldn't think that they would want to change it too much.

Stick with the 1j though! I want to see a hiace with a 1j running 10's!

I see what you are saying regarding the aerodynamics but I agree with Shane that you probably are leaving a bit on the table. I reckon if you dropped that converter to a 3500rpm or so and used a 50hp shot of nitrous you would probably still be able to 60ft the same and you would have a lot less slippage in the converter in the deep end.

[al167]

I see what you are saying regarding the aerodynamics but I agree with Shane that you probably are leaving a bit on the table. I reckon if you dropped that converter to a 3500rpm or so and used a 50hp shot of nitrous you would probably still be able to 60ft the same and you would have a lot less slippage in the converter in the deep end.

any smaller convertor and it takes an eternity get it on on boost. i had a 3200 stall convertor before wich was great with a t3/t4 turbo but when i put the 35/40 on it was practically undriveable with only 3200 stall even with the .63 housing.
the 35/40 comes on at 3600 rpm with full boost by 4000
now the car is, sorry let me refrase that ; was really driveable and you could put your foot down and 2 seconds later your at full boost. i hate lag couse you cant win a race when you have to sit on the line for 5 seconds stallin up!!!!!!!!!!
maybe my car is extra laggy than an older 1j ????????
my vvti is switched off and it wouldnt be making the low end power that it should to slip the convertor till it reaches boost
i was a bit anoyed that the microtech LTX12s ecu couldnt control it.

[chris davey]

Oh I know all about incorrect stall speeds. 13.35@114mph with a 2.37 60ft I see what you are saying and it basically comes down to if you want to run nitrous or not? Like you could go to a 3500ish rpm stall and bit of nitrous and run 25psi to make about the same hp at the flywheel but put more of it to the ground through the tighter converter.

Just a thought anyway.

What diff gears do you run and what size tyres?

[BTM]

With a 9 inch diff and C4, the motor is probably making substantial power at the crank. The drivetrain loss would be huge. So maybe the rwhp isn't a true reflection of what the motor is putting up with....

[Mr DOHC]

i'll have to send dez here, he can offer some info, haveing recently killed a 1J with huge power

[chris davey]

With a 9 inch diff and C4, the motor is probably making substantial power at the crank. The drivetrain loss would be huge. So maybe the rwhp isn't a true reflection of what the motor is putting up with....

c4's are pretty efficient aren't they? I know they are more efficient than a T400 but don't know how they compare to say an a340e.

[al167]

yeah i think there is about 100 hp loss from engine hp to rwhp with c4 and 9inch
heres why:
when i got my car on the dyno it only made 250rwhp at 12psi?wich is as low as my tial wastgate spring allows. all with fmic microtech 3 inch exaust gt 3540
the engine comes from factory at 280hp 206kw(toyota specs) at say 7 or 9 psi(i dont know i never used the factory ct26)
its only a guess to say that at 7 psi my set up would probably only make 180 rwhp

but saying that maybe hp isnt the best measurement what about torque?
i know a torque convertor does exactly what its name says; convert hp to torque

at 32 psi the hiace made a peak of 2000 LB of tractive effort at 5000 rpm.
tractive effort is dyno dynamics measurement and i dont what that compares normal torque figures.

anyone else got torque figures?
maybe we should have a torquepower heroes?

[chris davey]

I was under the impression that the torque figures couldn't be compared for some reason?

How much does your car weigh race weight including you?