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Location:
adelaide
Registered:
October 2003
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1jz limits
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Thu, 09 September 2004 09:07
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Hey guys ive been doing a lot of searching and reading about the 1jz etc. Just wondering what its limits are with the standard ecu and injectors and stuff. Would be going into a gz20 . Id roughly like to get around the 225rwkw mark , that would be great. What would need to be done / mods to get it up to that ? Can the standard ecu and injectors etc run that amount of power ? Things id do are probably twin dumps , full exhaust , maybe turbo and front mount upgrade along with some piping upgrades. Would that figure be possible on about 12 or 14 psi ? Basically would need to be done to get that figure.
cheers.
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Location:
newcastle
Registered:
June 2002
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Re: 1jz limits
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Thu, 09 September 2004 11:54
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to get 225 rwkw from an auto you would need intercooler exhaust dumps an interceptor of some sort or ecu and around 16 psi boost .
all with stock turbos ,ecu just fcd and a/f ratios around 12/1
im quite confident of pulling this number at the next nats dyno day (previous 204 rwkw) . but is yet to be proven
add about 7 % for manual rwkw figure
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: 1jz limits
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Thu, 09 September 2004 12:00
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as CM said, it's generally accepted that the 1j will make 225rwkw on standard turbos and injectors (although you're getting close to the limits of both)
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Location:
adelaide
Registered:
October 2003
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Re: 1jz limits
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Thu, 09 September 2004 12:08
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Yeah its actually a manual. Yeah i dont mind upgrading the twin turbos either . But i really dont want the hasle or expense of replacing the computer and losing any driveability and extra cost etc. So upgrading the turbos wouldnt phase me to much. Just really wanting to keep the standard 1jz ecu and injectors.
Do you guys know of any good twin turbo upgrades to replace the standard ones ? That still run ok with the stock ecu and injectors ?
thanks for the info
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Location:
Adelaide
Registered:
September 2004
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Location:
Melbourne
Registered:
March 2003
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Re: 1jz limits
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Thu, 09 September 2004 12:28
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http://www.alsc.aus.as/messages/21396/35358.html?1 094691778
New CT12a turbos for $2630. I think these are a good option for the power you are after. Of course you can sell off your old turbos for about $500 so its a bit cheaper.
These have been tested on a members car for the last few months and are available now. Neil is also a great guy to deal with so you would have no problems. Apparently dyno results are coming soon.
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Location:
Perth
Registered:
October 2002
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Re: 1jz limits
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Fri, 10 September 2004 03:18
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A manual 1JZ into gz20? Don't be to quick to write-off after market ECU's. In addition to the PFC, there is also the Laltech range. I've got this one: http://www.tweakit.net/shop/product_info.php?cPath =&products_id=92
which came with 1JZ base-map. Bigger injectors aren't too exxy 2nd hand, either.
Neil's turbo's look great and would be a good place to start. Just don't rule out ecu and injectors.
Justin
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Location:
adelaide
Registered:
October 2003
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Re: 1jz limits
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Sat, 11 September 2004 04:39
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Thanks for the info guys , just quickly could some1 give me the power / torque (nm) specs for the 1j 2j 1g and 7m engines. Cant seem to find accurate stuff.
Thanks.
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Location:
Montrose, VIC
Registered:
May 2002
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Re: 1jz limits
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Sat, 11 September 2004 05:18
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If you've got the money, why not swap in a PowerFC?
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Location:
sunny coast, qld
Registered:
October 2002
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Re: 1jz limits
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Sat, 11 September 2004 07:24
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the limits of a 1jz are all about the tune as I found out after a mechanic blew something internally on my 1jz which only has twin dumps, exhaust and boost controller (set up incorrectly). This was caused by detonation.
What ever you do, make sure you take it someone you trust and have some sort of knock sensor.
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Location:
Melbourne
Registered:
March 2003
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Location:
Brisbane
Registered:
July 2002
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Re: 1jz limits
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Sat, 11 September 2004 11:51
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250rwkw will be a lot more acheivable considering everything is done in shootout mode on dyno's
mine made 200rwkw with intercooler, 2.5 inch exhaust and 11 psi
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Location:
Brisbane
Registered:
May 2002
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Re: 1jz limits
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Sun, 12 September 2004 07:21
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That's very debatable. 
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Location:
Brisbane
Registered:
May 2002
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Re: 1jz limits
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Sun, 12 September 2004 11:11
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| Norbie wrote on Sun, 12 September 2004 17:21 |
That's very debatable.
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funny
Cheers
Wilbo
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Location:
Brisbane
Registered:
July 2002
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Re: 1jz limits
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Sun, 12 September 2004 11:16
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well.. wait till next dyno day and we will see what it makes
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Location:
adelaide
Registered:
October 2003
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Re: 1jz limits
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Mon, 13 September 2004 08:17
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Thanks for the info guys.
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Location:
wangaratta
Registered:
May 2004
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Re: 1jz limits
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Mon, 13 September 2004 10:36
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i know of a couple of 1JZ's kicking around that have made between 250 and 270 rwkw with the standard turbos.
although some will debate this, it has been proven with many a dyno comp using shootout mode.
although they used huge FMIC ( like trust drag series ), the dump pipes were one of the key upgrades besides tuning.
good luck with your goals mate, would be an absolute beast in manual trim!!!
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Location:
Brisbane
Registered:
November 2002
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Re: 1jz limits
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Mon, 13 September 2004 11:28
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| Quote: |
the limits of a 1jz are all about the tune
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Fantastic, finally people are starting to learn 
Most engines break subject to tuning issues, not strength issues. Some engines are more forgiving of a bad tune which might render them 'stronger' but in general your average modern engine is a pretty hardy thing.... and the 1JZ is above average!
Just make sure it's on a safe tune and you can romp in anything this side of 600hp with no concerns.
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Location:
sunny coast, qld
Registered:
October 2002
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Re: 1jz limits
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Mon, 13 September 2004 21:33
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| 7M-Brisbane wrote on Mon, 13 September 2004 21:28 |
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the limits of a 1jz are all about the tune
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Just make sure it's on a safe tune and you can romp in anything this side of 600hp with no concerns.
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And that is what my mechanic forgot to do before he went and killed my engine. My car would have only been making about 180-190rwkw and something has blown internally because of big detonation I presume. Will know for sure when I get the time to pull it apart.
only mods I had were:
twin dumps into 3" exhaust
hiperboost controller @ 13psi (fitted incorrectly  )
So I totally agree with 7m-brisbane, make sure it has a decent tune otherwise even the strongest engine will break.
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Location:
adelaide
Registered:
October 2003
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Re: 1jz limits
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Tue, 14 September 2004 08:36
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Also with the straight plug in Power FC's ? How are they different from the standard , are there any gains from them ?
cheers.
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Location:
Brisbane
Registered:
November 2002
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Re: 1jz limits
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Tue, 14 September 2004 09:12
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The Power FC(Full Computer in Japlish I believe)'s have controllable fuel/ignition settings and retain all the factory sensors. Unfortunately places that tune them are hard to find, and this is the main drawback. It also doesn't have the flexibility of a 'full' system like a Haltech/Motec but it is certainly the best 'bandaid' approach available and is much cheaper than the others.
They are also only available for manual engines I believe.
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Location:
adelaide
Registered:
October 2003
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Re: 1jz limits
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Tue, 14 September 2004 09:23
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They can come pretuned cant they ? so they dont need to be tuned ? Or is it a must for them to be tuned.
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Location:
Brisbane
Registered:
July 2002
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Re: 1jz limits
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Tue, 14 September 2004 09:30
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| 73ke25 wrote on Tue, 14 September 2004 19:23 |
They can come pretuned cant they ? so they dont need to be tuned ? Or is it a must for them to be tuned.
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id assume they come with a base tune that a good tune is then meant to be made from using the requirements of customers
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Location:
nz
Registered:
June 2004
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Re: 1jz limits
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Tue, 14 September 2004 10:30
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Well i max my 1jz out at 226kw with the twins but you have got to up grade the fuel pump that is a must and 430cc injectors intercooler but now i have put a t04r turbo up grade last dyno i ran 304 kw at low boost but trying for 360kw soon.
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Location:
adelaide
Registered:
October 2003
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Re: 1jz limits
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Tue, 14 September 2004 10:43
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so what did you have done for the 226 kw's
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Location:
nz
Registered:
June 2004
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Re: 1jz limits
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Tue, 14 September 2004 11:40
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well i did the big intercooler first fcd 750hp fuel pump 3half inch exhaust from turbos 430cc injectors fuel presser reg and 17psi boost and i ran tha boost for 12month with no problems and all that was with a auto well 8 autos in one year a lot of drag racing lol .
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