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Location:
Brisbane
Registered:
July 2002
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1JZ max power
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Sat, 03 August 2002 06:47
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Hey all...
I'm looking at buying a JZA70 and I have a few questions which I haven't been able to find answers to either on the web or by searching the forums. I'll just list them:
1. How much power can you get out of a 1JZ with the stock twin turbos, with air filter and exhaust running higher boost (stock IC).
2. How much boost can you run safely with stock turbos?
3. Would highflowing and fitting bigger compressor wheels to the CT12A's be a good idea to increase boost without converting to single turbo?
4. Has anyone done this?
5. Would this be cheaper/more expensive/same as a single turbo conversion?
6. What sort of injectors does the 1JZ-GTE have?
7. At what point does the engine hit fuel cut?
Ummm... this is all I can think of. I found shitloads of info on modding the 7M-GTE to get more power, but I've found next to nothing about the 1JZ.
8. Know of any good 1JZ resources on the web?
Thanks guys!!!   
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Location:
_Sydney _
Registered:
May 2002
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 Re: 1JZ max power
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Sat, 03 August 2002 06:57
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Good questions, some that I have thought of aswell... anyone? 
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Registered:
May 2002
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Re: 1JZ max power
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Sat, 03 August 2002 07:53
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All questions covered in past posts.
With big intake, 3.5" exhaust, twin downpipes, FCD, intercooler, the stock turbos are able to push about 300kW at the flywheel absolutely maximum at 16psi. It is probably not so safe to run more than 15psi for extended periods of time.
Just exhaust and intake and 14 psi should see 225kW.
Forget high flowing the existing turbos, if insurance is not a problem, just wack a big single on the side, the head should flow about 500-550HP before porting.
Pete
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Location:
Forrestfield, WA
Registered:
August 2002
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Re: 1JZ max power
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Sat, 03 August 2002 08:15
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Well On mine, i simply got a K&N Filter, and a 3" Full Zorst, Dump, Hiflow Cat, Muffler, no Resonators (yes its loud, very loud) and its all good.
I had it dyno'd at 250.9rwhp, ive been told that would roughly equate to around 250kw at the flywheel.
Next thing im getting the turbos rebuilt with metal turbine (instead of ceramic) and getting the housing machine out. This combined with an Apexi SAFC should see it over 300kw... i hope 
I have no idea about full cut etc, but ive been told that max boost you should run is 14psi, otherwise your turbos will end up in your Cat converter.
Apart from that they usually do the water pump anywhere from 80,000kms to 120,000kms, Power Steering Pumps get leaks, top radiator tank will crack, etc etc, but they are really easy to get most parts for and if serviced regularly (oil + filter every 5000kms) they are a very reliable car.
Feel free to contact me off forum for anymore info dude
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Location:
Wollongong
Registered:
July 2002
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Re: 1JZ max power
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Sat, 03 August 2002 11:05
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apparently you should only got to about 14psi before you run the risk of destroying the turbine as they have fairly brittle ceramic blades that break off if stressed too much. You can get steel turbines as mentioned, last price I heard to get them flowed and all done real good was about $1200 EACH (it was by the guy that built the turbos for The Judge though), although I have heard of them being able to be done for as little as $400 each too. I think the injectors are 440-ish cc jobs and side feed ...not to sure there, and I'm told that the fuel cut is around 15psi on a 1J...I don't own one so I really have no idea!
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Location:
gold coast
Registered:
May 2002
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Re: 1JZ max power
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Sat, 03 August 2002 13:11
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390cc injectors, JDM 2J's have 440's These are both rail mount injectors.(Side Feed)
I am yet to hear 1st hand of the turbo's exhaust wheel failing. (Plenty of hear-say about this matter)
14.7 PSI (1 BAR) Fuel cut (First hand info)
Stock IC is Big, but apparently lame in the flow department. (Second hand info) 250 RWHP is about it for stock ic.
These cars run horribily rich when the boost is wound up, you would swear my car was a diesel under full boost.
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Location:
Newcastle
Registered:
May 2002
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Re: 1JZ max power
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Sat, 03 August 2002 21:50
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Apparently this and apparently that, my turbos have been flogged hard at 17psi for 80,000k's for 2 years and are still going strong (with twin pipes). They are out of LIM03L, Luke knows it well. So I don't know about this 14 psi from all you text book experts.
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Registered:
June 2002
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Re: 1JZ max power
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Sat, 03 August 2002 22:16
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I would also like to hear from someone first hand who has had a turbo come apart. I know of a few guys here in the US who have run 17-22 psi for quite awhile.
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Location:
Montrose, VIC
Registered:
May 2002
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Re: 1JZ max power
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Sun, 04 August 2002 02:53
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But this '17-22psi' is this against the restriction of a magazine sized intercooler and other restrictions? What kind of power are these people making? (See how many people can claim 260 rwkw with stock turbos at any boost, then prove it..)
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Registered:
May 2002
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Re: 1JZ max power
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Sun, 04 August 2002 03:01
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Well it's a simple matter of looking at the efficiency charts, and you will find that there is basically no point pushing more than 17psi as the heat generated is simply rediculous.
To even get 17psi, you would need a very high flow exhaust and intake plumbing. With a stock intercooler the most that mine will push with the boost control is 16psi where it surges dramatically.
P
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Registered:
June 2002
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Re: 1JZ max power
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Sun, 04 August 2002 03:47
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I've yet to see anyone use a stock exhaust or intercooler here either. I run the hks type S intercooler and piping,custom Y pipe and 75mm catless all the way back.All the other guys have similar setups. I am unsure how our US HP ratings compare to yours, but mine made 327rwhp/320/rwtq at only 15 psi. Only other mod was a apexi AFC.
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Location:
Brisbane
Registered:
July 2002
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Re: 1JZ max power
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Sun, 04 August 2002 09:52
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Thanks for all the replies guys...
It's really helped.
Just one question which wasn't cleared up completely: Injector size... 390cc or 440cc?
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I supported Toymods
Location:
Perth WA
Registered:
May 2002
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Re: 1JZ max power
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Sun, 04 August 2002 10:09
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Injectors are the 380-390cc size
I run 0.9 bar boost and get 193rwkw (at Tilbrooks)through the auto trans.
Stock turbos, K&N pod,stock intercooler, Apexi S-AFC, 3 inch exhaust from dump pipe (with 2 resonators and a muffler), high flow cat.
I have'nt heard of any turbo delaminations, but I'm not keen to be the first. I think that with standard intercooling, it's not worth pushing much higher boost as inlet temps rise rapidly anyway.
Instead of modifying 2 turbos ($$$$ you may get more gains per $ with a big single. Of course you will have to shell out for intercooler/ injectors/ fuel pump / computer /insurance /clutch / brakes all at once if you get the big turbo.
Its becoming difficult to do anymore cheap things - the only remaining affordable performance mods I can do would be those huge MUGEN stickers, and to send the wheels for chrome dipping.
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Location:
Sydney
Registered:
May 2002
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Re: 1JZ max power
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Sun, 04 August 2002 12:58
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CT12As do delaminate - just ask any of the ALSC or LSOC members with 1J'd Soarers who've had to spend thousands as a result.
They say a picture is worth a thousand words
Disintegrated exhaust wheel and normal one
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Location:
Sydney
Registered:
May 2002
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Re: 1JZ max power
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Sun, 04 August 2002 14:37
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What sort of $$ you guys talking about for a single turbo conversion? Everyone says it's cheaper, but I've been quoted:
Garrett GT30 Pro BB ~6K
Custom Manifold, External Wastegate & Fittings ~2K
8 grand is a substantial investment and not the cheap solution everyone seems to suggest - add injectors, fuelling, and ECU to this and it really gets out of hand.
Have I been misled with pricing?
For 4.5K you can buy a pair of Hybrids with the CT12A cores replaced with Garrett GT28 BB cores, steel exhaust wheels, oversized wastegate, larger compressor wheel and machined standard housings utilising existing manifolds and wastegate - you can ditch the toyota compressor housing as well and have Garret housings instead with a large array of compressor wheels and housings to suit your preferred HP level.
Rigo
1. 200rwkw
2. 15-20psi depending on intake, exhaust and IC restriction
3. Yes
4. Yes
5. Debatable - depends on your choice of single & ors
6. 380cc
7. ~14psi
8. Toymods, LSOC, ALSC
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Location:
Forrestfield, WA
Registered:
August 2002
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Re: 1JZ max power
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Sun, 04 August 2002 16:15
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I got quoted ~3k including labour to get my turbos removed, machined, the turbines replaced with KKK wheels and refitted to the car. I dont think any other modifications are needed just to run these, it was just offered as a better alternative to replacing ceramic turbos that have blow with ones that could possibly do the same again.
I have heard from EVERYONE that i have ever spoken to or read about ceramic turbines in JZ's and RB's (Skylines) that 14psi is absolute max. If you read a few issues ago of HPi Magazine there project R34 car blew its turbos running at 14 psi on a track day.
My 2c
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Location:
UK
Registered:
May 2002
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