How much Power from the 1jz???

[Maverick]

Hey guys,

I`ve got a manual 1jz cressida, running stock turbos, full custom dump pipes and 3.5 exhaust, big front mount, and and it runs an EMS stinger. car is also fitted with a bosch 044 pump. The only other mods I plan at this stage1 are an upgrade to 2j injectors, which i believe are 440cc... how much power do think I can get out of this baby with the standard turbos? the engine has been full rebuilt,aftermarket forged slugs, ported head, stock cams. (done by previous owner) I just don`t want to spend a shitload thats all.

also are there many singles that are not over priced and will give good power gains while still having that instant torque from the smurf turbos (or at least a good compromise) ?

i`m interested to know what kind of boost ppl are running with stock turbos and the power their getting...


cheers!

[big_zop]

Maybe not an answer to your question of what yours will make (which will depend on a number of factors) - but check this out for some of what others have put up.

xJZ-Series Engine Variants - Dyno results

Normally, the limit is about 250rwkW with the stock turbos and sensible boost. I say normally as others have gone past this but it wouldnt be suitable for the steet (NOS).

here is a graph that shows the entire progression of the HPI Project Soarer (JZZ30 manual) - not something that is concrete but a good base. Once the Power FC was installed, it was tuned for whatever boost was generated with the efficience increasing mods (not sure what these were - my magazines are all over the place). Exhaust doesnt include the separated dump pipes, that is what the custom dumps are. The boost line is where they increased it to 1.2bar. This was all done on the stock injectors and there was a fuel pump upgrade at some point - not sure when but probably after the Power FC/with another mod so there werent any tune issues.

[Maverick]

cheers! I don`t want anymore than 300kw as it is a street car and anything beyond that is probably too much, for me anyway but i guess i`ll get it dyno`d and see what can do. I also hear that with proper dump pipes the ct12a`s will handle much more boost without delaminating, as the custom dumps help remove much of the excess heat created by the stock dump...?

[big_zop]

I also hear that with proper dump pipes the ct12a`s will handle much more boost without delaminating, as the custom dumps help remove much of the excess heat created by the stock dump...?

Thats the school of thought, but there is a limit to how efficient the turbos will be at much higher boost levels. Without knowing the compressor maps, you could increase boost until no more power is made but i dont know where that would be and could be affected by a number of things. Or keep going until you are comfortable at a certain boost level (so long as it is still making power).

This Cressida has a 1JZ that makes over 300kW on the stock turbos (not sure on the fuel mix though) - http://www.toymods.net/forums/showthread.php?t=25456

[Dieseltrain]

Thats because that Cressy is running 2 shots of NOS on C16 also.

Ive made 260rwkw with standard injectors and stock turbos without aftermarket cams.. That was @ 17.5psi. I wouldnt expect more than that even if i could up the boost.. Thats about the limit.

[Maverick]

thanks guys for the info i`ll get cracking and see what it`ll do !

[Smokey228]

I dont know about the stock turbos taking you to a legitimate 250rwkw! But dynos will tell you all different figures...

Going by my dyno read out, of 195 with a stock motor + cooler and xhaust, id say on same dyno, with stock injectors, 044, pfc, cooler, xhaust w/ stock dumps. i'll be happy to see 220rwkw?
With a tune for around 15psi with a spike to 16psi...

I know you can run 18psi on stockers, but they wont last long in alot of instances, but then again, ppl claim to run pretty amazing numbers on the stockers!

Grim on here makes 250rwkw with a cheapie KKR turbo and a ebay mani. Stock everything else...

Have a look on here anyway man, its been covered about elentybillion times...

Cheers,
Jase

[Smokey228]

Thats because that Cressy is running 2 shots of NOS on C16 also.

Ive made 260rwkw with standard injectors and stock turbos without aftermarket cams.. That was @ 17.5psi. I wouldnt expect more than that even if i could up the boost.. Thats about the limit.

I also hear different stories, some say that this runs steel wheels turbines, some say otherwise...

Cheers,
Jase

[Stomps]

Awesome thread... I wanted to know what I should expect.. i know its only rough guesses but hey, better than nothing..

Anyway.. ill be keen to see what my car makes once done..

1j non vvti, 35r with .63 rear housing.
HKS 264 intake and exhaust cams
540cc injectors, surge tank and big fuel pump
performance valve springs and retainers
OS giken adj cam gears
Custom intake plennum with trumpets.
FMIC with 3" piping
Straight thru exhaust 3" no cats no mufflers
48mm Turbosmart external gate
Microtech, e-boost 2

Judging by dyno results from the above link...

I reckon ill get 400odd rwhp....

Maybe more, depending on how much the .63 housing can offer me..

either way, i reckon ill get killer midrange...

Stomps

[Dieseltrain]

I also hear different stories, some say that this runs steel wheels turbines, some say otherwise...

Cheers,
Jase

Are you referring to the Cressida or my soarer in regards to Steel wheel turbo's? Cause i know for a fact Both cars run ceramic turbines still

[Dieseltrain]

Stomps, That does sound like a killer midrange setup... Would love to see the torque graph when its tuned plz mate

[big_zop]

Only reason why i didnt say to search for the answers was that i already knew them. There are plenty of threads that relate to this and people that have fare greater experience in this area than me - have a chat with them.

What size turbo would you use to make 400 - 450 WHP (max) with a 1JZ... - great thread

The Magic 300 1jz

Whats your opinion about the GT3540

300rwkw = gt30 + 1jz + boost = Done like a dinner

[Smokey228]

Are you referring to the Cressida or my soarer in regards to Steel wheel turbo's? Cause i know for a fact Both cars run ceramic turbines still

I was talking about Jaks cresida...

I think it was the father of the car, (not actauly sure who owns it, as they all have equal input ), but i thought it was him, telling Jack (ATMO_BT1 from Zoom) that it ran steel wheels and thats how they have run 28psi through stock turbos for the life of 3 motors...?

I think it was Jack, might have been greg or something...

Cheers,
Jase

[fatboy13]

With stockies I made 230rwkw at 17psi... with 2J injectors, dumps, exhaust, cooler, cam gears and a haltech interceptor...

Depends on how safe you want your tune to be... Im running about 12 AFRs... im sure more power would have been apparent had that been high 12s...

[ReQuieM]

Yup ive had over 255 @ 18 on stockies, 235 @ 13.5 had my build up dynos all on the same dyno so its as legit as you will get out of a dyno.

With some head work I'm aiming for about 280-290 on stockies with out additional power adders (NOS, C16, etc)