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Location:
sunny coast, qld
Registered:
October 2002
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1jz - order of mods?
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Mon, 02 February 2004 03:01
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Ok I have a stock 1jz except air filter and 3" exhaust (standard Y-pipe) and I am not sure which order i should get my mods done for best 'bang for the buck'?
The mods I would like are:
twin dump pipes (what size do people recommend?)
Celicamad boost controller
thicker and slightly larger intercooler. (currently front mounted jzx90 type, similar to jza70.)
thanks
Chris
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Location:
Brisbane
Registered:
May 2002
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Re: 1jz - order of mods?
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Mon, 02 February 2004 03:06
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I'd go dump pipes first, then intercooler. After that you might find you don't need a boost controller.
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Location:
sunny coast, qld
Registered:
October 2002
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Re: 1jz - order of mods?
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Mon, 02 February 2004 03:42
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yeah, that is what i was leaning towards. time to get some quotes 
So what should i expect to pay approximately and what size?
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Location:
Perth
Registered:
October 2003
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Re: 1jz - order of mods?
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Mon, 02 February 2004 04:53
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I reckon you should go for a bigger intercooler, best OEM is the GTR, but you can buy equivalent new hybrids nowadays for the same price. Core is 600x300x70 AFAIK, I have a 400x500x57mm custom in front of my 1J.
As for the dumps i made mine myself. Laser cut flange, then 2" stainless for the turbine and 1.5" for the wastegate then merging into a 2.5" reducer with flange, all in 1.6mm wall thickness.
I think your boost will go over 12psi with these mods, and your exhaust, perhaps 15 psi? If you have the standard computer i think you need a boost cut defender, not sure though as im using Haltech.
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Location:
Gold Coast
Registered:
May 2002
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Re: 1jz - order of mods?
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Mon, 02 February 2004 04:57
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Yeah you ride the boost cut with dual dumps and intercooler.
With my 600x300x90 bar and plate cooler and the dual dumps it rides 0.9bar most of the time. I have hit boost cut only a couple of times though at 1.0bar when it spiked.
I'm not running a boost controller, stock actulators.
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Location:
sunny coast, qld
Registered:
October 2002
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Re: 1jz - order of mods?
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Mon, 02 February 2004 05:34
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thanks guys.
after those mods the ECU will be next to get rid of boost cut and speed cut and get a few extra kws
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Location:
Perth
Registered:
October 2002
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Re: 1jz - order of mods?
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Mon, 02 February 2004 07:44
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Anyone who has done it want to hazzard a guess as to boost with exhaust & BFMIC, sans dump pipe? I'm guessing (hoping) it'd be somewhere around 10-12psi, which still leaves me a bit of scramble room before cut.
cheers,
Justin
JZA61
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Location:
Wollongong
Registered:
May 2002
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Toymods Board Member
I supported Toymods
Location:
Turramurra, Sydney.
Registered:
May 2002
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Re: 1jz - order of mods?
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Mon, 02 February 2004 09:42
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Our 1J cressida is only hitting 10psi with 3" straight through exhaust & 600x300x75 bar & plate 'cooler. It is running standard JZA-70 air box & filter, but has been opened up quite a lot & only gets air from outside the engine bay.
I might go & try it without the filter to see if that's causing a restriction...
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Location:
sunny coast, qld
Registered:
October 2002
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Re: 1jz - order of mods?
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Mon, 02 February 2004 11:49
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yeah, mine runs 10psi max with the current 3" exhaust to the standard Y-pipe and an aftermarket air filter. So with a bigger intercooler and twin dump pipes i would be pretty close to boost cut?
I think I will be getting a computer not too long after that anyway as my speedo is out and my speed cut will be around 150km instead of 180 and I can't be stuffed getting all sorts of little defender thingies.
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Registered:
June 2002
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Re: 1jz - order of mods?
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Mon, 02 February 2004 20:34
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Just one thing to think about.
What are you going to do when one of the twins blow??
Replace/Rebuild?? Or go Single??
If you plan to go single I wouldn't bother getting some twin dumps made as they will become useless = waste of $$$.
ps. XT130 + 1JZ-GTE = JZT130 does it not!?!?!
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Location:
Perth
Registered:
October 2002
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Re: 1jz - order of mods?
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Tue, 03 February 2004 03:40
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Yeh, this is one of the reasons I've held off on a custom dump. Will probably get Haltech as next performance upgrade (after diff). I'm still very undecided whether I will eventually go GT3040 single or GCG's ball bearing GT25/ct12 hiflow hybrids. In the meantime, I guess I should nurse those babies on medium boost
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Location:
sunny coast, qld
Registered:
October 2002
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Re: 1jz - order of mods?
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Tue, 03 February 2004 03:49
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before I was all set to go single in the near future and then reality hit and I realised how expensive it is. So I was going to do some normal mods first and then evaluate if I want it to be faster.
My car only weighs about 1150kgs so I don't really need as much power as something like a JZA70 to go as fast.
I think I will get the intercooler first, then possibly boost controller, then I am going to japan so I will pick up some injectors. Then save for an ECU (wolf 3d or Micro LTX12 I think) and then whack the injectors in and get a turbo and exhaust manifold installed. Of just stop after the boost controller and wait until my turbos blow
Thanks people
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Location:
Perth
Registered:
October 2002
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Re: 1jz - order of mods?
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Tue, 03 February 2004 04:00
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Hey Chris,
I'm in the same boat - mine is somewhere around 1200kg. I'm leaning towards the hoflows at the moment for the low-mid torque. I have to keep reminding myself that awesome power over 110kph isn't much use to me.
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Registered:
June 2002
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Re: 1jz - order of mods?
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Tue, 03 February 2004 20:47
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I'll be looking along the lines of a GT3040 when something happens to the twins.
Nothing too big as all topend power is useless most of the time!!
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I have to keep reminding myself that awesome power over 110kph isn't much use to me.
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Thats a odd POV, why bother putting a 1JZ in then!?!?!
You have to think a little wider ie; Trackdays etc... when you can fully utilise the 1JZ.
I wouldn't/couldn't limit myself to only using 1st & 2nd gear to get 110 as quick as possible, what are the other 3 for, various levels of cruising!?!?!
But I guess everyone has different reasons for doing their conversions.
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Location:
sunny coast, qld
Registered:
October 2002
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Re: 1jz - order of mods?
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Tue, 03 February 2004 23:12
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my car is for drag racing, so I think that i could certainly do with a nice big single turbo!
On top of the costs of fitting a single turbo, i remind myself that the faster you go the more often you break stuff
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Location:
Perth
Registered:
October 2003
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Re: 1jz - order of mods?
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Tue, 03 February 2004 23:21
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| Quote: |
Quote:
I have to keep reminding myself that awesome power over 110kph isn't much use to me.
Thats a odd POV, why bother putting a 1JZ in then!?!?!
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I don't think thats odd. I chose to go for a 1JZ over a 1UZ as it has a fatter torque curve down low, better pulling power for the 4b , and for that matter higher peak torque. A 1UZFTTE or 2JZGTE would be more ideal for low down pulling power, but not as cost effective 
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