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Location:
Milky Way
Registered:
July 2004
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1JZ-GTE Single turbo conversion. How common?
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Sat, 10 July 2004 10:34
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People,
As you can see this is my first post at toymods. That said, I would like to start of with a typical newbie question.
The 1JZ-GTE....
My understanding is that the current model is a single turbo VVTI hotstick. Apparently its an outstanding engine. However, the older version are twin tubo non-VVTI and have some issues.
Is converting one of the older model 1JZ engines to single turbo as fairly straightforward job? Is it a common conversion? Is it expensive?
Remember... first question, so please be gentle...
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Location:
On your mum!
Registered:
May 2002
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Re: 1JZ-GTE Single turbo conversion. How common?
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Sun, 11 July 2004 00:30
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converting to single turbo should be no more of a job than fitting a single turbo to any six cylinder.
The manifolding, exhaust system, and pipe work are the main issues. Apart from that, paying attention to water lines and oil lines so that they are reliable is the only other area to consider (how hard could it be?).
Good luck
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Location:
Brisbane
Registered:
July 2002
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Re: 1JZ-GTE Single turbo conversion. How common?
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Sun, 11 July 2004 00:43
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"issues".. what issues may these be?.. i havent had any with mine.. great engine
when you can buy complete single turbo conversion kits it cant be hgard right?
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: 1JZ-GTE Single turbo conversion. How common?
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Sun, 11 July 2004 01:04
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you are aware that 220 rwkw is a fairly easily obtainable figure on the stock turbos, aren't you?
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Location:
Brisbane
Registered:
July 2002
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Re: 1JZ-GTE Single turbo conversion. How common?
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Sun, 11 July 2004 01:15
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| draven wrote on Sun, 11 July 2004 11:04 |
you are aware that 220 rwkw is a fairly easily obtainable figure on the stock turbos, aren't you?
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though if u try and claim it u get flamed 
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Location:
Milky Way
Registered:
July 2004
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Re: 1JZ-GTE Single turbo conversion. How common?
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Sun, 11 July 2004 02:27
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I've got no doubt that the kw are easy to come by with the twin turbo setup. I was just thinking that the single turbo would overcome any "dips" in the power curve that plague most TT engines.
As far as the mod goes... would you keep the stock ECU?
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Location:
Brisbane
Registered:
May 2002
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Re: 1JZ-GTE Single turbo conversion. How common?
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Sun, 11 July 2004 03:08
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There are no dips in the power curve with a 1JZ. You're probably thinking of the 2JZ, which has sequential twin turbos, and yes it does have a dip in the power curve as the second turbo kicks in. The 1JZ has parallel twin turbos so there are no such issues.
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: 1JZ-GTE Single turbo conversion. How common?
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Sun, 11 July 2004 03:27
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depends on the car you're putting it in, if you've got a half cut, and how much power you want
generally, for less than 250rwkw I'd say keep the stock computer... it does a pretty good job of things.
if you're going to change the turbos/injectors, it's time for a new computer (or a piggyback possibly if the engine is in a jzXXXX chassis)
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Location:
Milky Way
Registered:
July 2004
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Re: 1JZ-GTE Single turbo conversion. How common?
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Sun, 11 July 2004 04:13
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The 1JZ has parallel twin turbos...
Thanks for clearing that up for me, Norbie. Clearly I haven't done my homework.
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Location:
sunny coast, qld
Registered:
October 2002
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Re: 1JZ-GTE Single turbo conversion. How common?
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Sun, 11 July 2004 04:36
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as Draven said the stock turbos are good for around 220rwkw (or 250rwkw if you are Martin Donnon ) The main failure is the ceramic exhaust wheels falling off due to extreme heat.
If you upgrade to a larger single turbo you will be looking at a lot of money to do it properly eg. ECU, injectors, intercooler etc. As well as making sure the driveline is able to hold the power.
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Location:
Brisbane
Registered:
July 2002
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Re: 1JZ-GTE Single turbo conversion. How common?
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Sun, 11 July 2004 10:37
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mine has a "dip in the power curve".. not sure why.. but you barely even notice cause ur redlining before u get a chance
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Location:
Milky Way
Registered:
July 2004
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Re: 1JZ-GTE Single turbo conversion. How common?
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Sun, 11 July 2004 14:22
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There's a dip? Really? 
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Location:
sunny coast, qld
Registered:
October 2002
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Re: 1JZ-GTE Single turbo conversion. How common?
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Sun, 11 July 2004 21:58
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johal: get some twin dumps and a real exhaust and see if still have that dip 
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Location:
Montrose, VIC
Registered:
May 2002
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Re: 1JZ-GTE Single turbo conversion. How common?
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Sun, 11 July 2004 22:23
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| draven wrote on Sun, 11 July 2004 13:27 |
depends on the car you're putting it in, if you've got a half cut, and how much power you want
generally, for less than 250rwkw I'd say keep the stock computer... it does a pretty good job of things.
if you're going to change the turbos/injectors, it's time for a new computer (or a piggyback possibly if the engine is in a jzXXXX chassis)
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Interesting theory! Inteceptors can help, but completely stock mapping + 250 at the wheels = I don't think Donnon could manage that, even down the pub! 
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Location:
Milky Way
Registered:
July 2004
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Re: 1JZ-GTE Single turbo conversion. How common?
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Mon, 12 July 2004 03:55
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Pardon my ignorance... A further question about the parallel turbo setup on the 1JZ
Do both turbos spool up to supply the TOTAL boost to the engine {eg 5psi+5psi=10psi} or does each turbo only supply 3 cylinders?
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Location:
Brisbane
Registered:
May 2002
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Re: 1JZ-GTE Single turbo conversion. How common?
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Mon, 12 July 2004 03:58
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Both turbos supply equal pressure, but each supplies half the volume of air. The output of each turbo is joined before the intercooler, so the combined volume of air supplies all six cylinders.
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Location:
Brisbane
Registered:
July 2002
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Re: 1JZ-GTE Single turbo conversion. How common?
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Mon, 12 July 2004 05:58
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im workin on it chris.. respray 1st
and boost controller this week
dumps and exhaust are for later this year
just punctured my fm901's
260 each 
lucky i got road hazard insurance
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Location:
Melbourne
Registered:
March 2003
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Re: 1JZ-GTE Single turbo conversion. How common?
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Mon, 12 July 2004 13:29
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That dip you mention on your 1JZ dyno chart, JAG7799, is fueling. Over fuelling!
When you have a fuel trimmer correctly tuned you will remove that and gain approx 10rwkw. I used the IFT made by perfect power and was happy with it to about 230rwkw. Upgraded to E-Manage since, works in progress.
My graph showed a greater dip than that before fuel trimming.
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Location:
Brisbane
Registered:
July 2002
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Re: 1JZ-GTE Single turbo conversion. How common?
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Mon, 12 July 2004 13:31
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yah.. my fuel atm is running as good as a std ecu can.. its 12:1 on full power
thats good for an auto ecu on man box
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Location:
Melbourne
Registered:
March 2003
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Re: 1JZ-GTE Single turbo conversion. How common?
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Mon, 12 July 2004 13:38
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yes i noticed your AFR. its good on full power and a little rich low down.
Not bad at all, i didn't know you were running the auto ecu in limp mode.
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Location:
Brisbane
Registered:
July 2002
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Re: 1JZ-GTE Single turbo conversion. How common?
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Mon, 12 July 2004 13:44
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its not in limp mode
the only reason they ever go in limp mode is because of people trying to wire them when they dont have the skill
if its all wired correctly and the box is swapped over it WONT go into limp mode.
obviously people tell u that cause they beleive its the ecu's fault and not their own hopeless inability to wire cars correctly
my auto ecu is doing a damn fine job
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Location:
Melbourne
Registered:
March 2003
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Re: 1JZ-GTE Single turbo conversion. How common?
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Mon, 12 July 2004 22:01
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My bad 
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Location:
Melbourne
Registered:
March 2003
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Re: 1JZ-GTE Single turbo conversion. How common?
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Tue, 13 July 2004 09:51
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Its reasonably common to put a single on.
I have driven this car in the link and it performs very well. Lights up the tyres and is very responsive. An ideal single turbo. Currently producing about 250rwkw at 13psi.
http://www.lexussoarer.com/gallery.html
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