Engine differences/conversions etc

[Guest Ross B]

Hi all

 

I've posted up warnings in the 'New Members' section warning about stupid questions, so here comes the first of many!

 

I'm a 200SX owner, specifically the ole S13 shape and at the moment, I can't afford or justify getting myself a supra.

 

Seeing as my S13 is off the road right now having some major overhauls, I'm toying with the idea of putting a supra engine into it. More than likely the turbo model.

 

I've done some reading up already, so I'm not entirely clueless, but I'd like someone to clarify the differences between the 1JZ and the 2JZ. Some texts I've read say that the JP's swear by the 1JZ, but I know the 2JZ is also a stonking motor.

 

So technical differences, second hand costs, upgradeability, personal experiences, power statistics etc would be nice.

 

Oh and if someone wants to lend me their car so I can judge whether I prefer the feel of the 1JZ or the 2JZ, I promise I'll TRY and bring it back in one piece

 

Thanks guys

[Guigsy]

well the 1jz's are 2 or 2.5L compared to the 2JZ's 3L other than that i dont know a lot. Ive driven a soarer which is 1JZ and it wasnt much different to the 2jz to be honest. I can imagine there being more parts for the 2jz though.

[garethr]

... I'd like someone to clarify the differences between the 1JZ and the 2JZ......

A used 1JZ is much cheaper than a used 2JZ

 

On a more serious note.... try the Driftworks forum. In the last year or so they seem to have discovered the manifold merits of the mighty JZ, sometimes as a replacement for those easily-broken Nissan motors

[Tom]

there are quite a few similarites but the 1JZ has a shorter stroke, is higher reving from factory, lighter, is available in TT and single turbo with vvti, shares the same pistons as the 2JZ (along with head parts iirc?) and is far cheaper to buy(at the moment) I suspect the prices will go up very soon though!

 

I have 2 vids on streetfire of some 1jz s13s/s14's/volvo's/bmw's/skylines in thailand, its a very popular engine there!

Edited September 25, 2008 by Tom (see edit history)

[Guest Ross B]

Right, I've been doing a bit more reading up on these here engines, an seeing as I need to start saving to buy soon, I need to make a decision.

 

The 2.5L TT, is a 1JZ right? Can come from an JZA70 or a Soarer? 280HP standard? What is the BPU equivalent? I'll be installing into a bare engine bay so obvious upgrades (filter, exhaust etc) are a given.

 

Also, what about the 7M-GTE? I assume these are from the older supras as alot of the 1990-1992 ones off autotrader all list as a 3L turbo. I've read that you can add 100HP to these just by changing the exhaust, is this true?

 

Many thanks.

[dan4]

have you been inspired by Steve Usher who competes in D1 with the s14 with a 2jz-gte fitted? it is awesome

 

maybe worth you researching that car to find more ideas? i think he bought and built the whole car to around 400bhp for around 7k lol

 

spec:

2jzgte 3000cc twin cam, GT35R, 700cc injectors, custom inlet plenum , top mount turbo, hks external waste gate, Z32 fuel filter, Cusco engine mounts, Koyo aluminum two core radiator with Audi TT fans, Modified APEX 80mm stainless front pipe, and blitz Nur Spec R stainless cat back using neo synthetic oils

 

Drive train

 

R154 gearbox, neo synthetic oil, with Drift works gearbox mount, Fidenza Aluminum fly wheel, act paddle clutch, Nismo GT PRO LSD neo synthetic oi

[Swampy442]

TBH mate if youre looking at a Supra anyway, it might be cheaper in the long run to just buy one, given the market at the mo. A complete 2jz w/ancillaries will be 1500 plus, then you need the box. A complete 1JZ w/ancillaries is about a grand + manual gearbox conversion unless you can find a rare manual at a breakers. I know all this cos Im a Soarer owner who lunched his engine and has looked at all these possibillities lol. You could even be a bit different and do a 1.5JZ (2JZ bottom end with 1JZ head)

1JZs came in a variety of cars, Chasers, Soarers, Supras but in the UK youre more likely to find Soarers in breakers. Forget the 7M motor, JZ series are far superior and the M engine has problems with head gaskets.

BPU? Well the 1JZ results are less startling than the 2JZ. Standard airbox is better than a cone filter ( I run an ARC airbox) The most restrictive thing is the turbo dump pipe or Y pipe but replacing that chimes in at 3-400 quid. Basic mods for power is cut the front off the airbox, decat and straight through to back boxes and an FCD will get you about 320 at the crank. I run an Emanage ultimate, 1.2 bar boost, front mount, ARC airbox and got 385 at the fly, or 328 whp with 323 torques.

Hope that helps and if you need any more info give me a shout

[Guest Ross B]

Thanks for the input guys, much appreciated.

 

To be honest, as much as the 2JZ makes me want to do a sex wee (and I've never driven one, or even been driven in one!) I'm strangely drawn towards the 1JZ, for reasons unknown.

 

Powerwise, I'm not after anything amazing, I just want some more torques than a CA18 or SR20, a better sound and a little bit of reliability (in comparison anyway!).

 

I wasn't aware that you could use the 2JZ bottom end and a 1JZ top end. Is the 2JZ bottom end stronger than the 1JZ or is there any other particular reason that this setup works?

[garethr]

I wasn't aware that you could use the 2JZ bottom end and a 1JZ top end. Is the 2JZ bottom end stronger than the 1JZ or is there any other particular reason that this setup works?

Only really worth it (IMO) if you already have a 1JZ with a single conversion and either want more capacity or have blown the bottom end. Otherwise, you might as well just use the complete 2JZ.

 

 

If you are not planning a single turbo conversion, the 1JZ would be easier because the turbos are parallel. The 2JZ turbos are sequential and complicated (http://www.max-boost.co.uk/max-boost/supra/turbo.htm), although you could do a "true twin conversion" (TTC), I suppose (http://www.internetwork.org.uk/ttc/ttc.htm).

Edited October 5, 2008 by garethr (see edit history)

[bondango]

Ross, As said, check Driftworks, the 1jz/2jz conversion has been well and truely nailed. Also, the complete 2jz conversion kit with r154 can be got of ebay, which includes modified pan, shaft, mounts etc etc, the seller will also patch your old loom to the 2jz loom.

 

personally, i would be looking into the 1uz v8 transplant if the car is going to be used for drifting - The 1jz isnt the torqiest of motors.

[Guest Ross B]

I have looked into the 1UZ, it's certainly a cheaper alternative and there are available sources to answer questions if and when I'd need help, but it just isn't quite the same as having a JZ.

 

It's a bit naive maybe, but I'm used to turbo motors as opposed to large capacity n/a's. I'll have a chat with the guy on SXOC that has already done the conversion and see what he says. Like you say, it might be a better idea, but I'm a stubborn git!

[Stealth-1JZ]

if it helps i got 200whp when my 1jz was bone stock and 216whp with a cat back [nur spec]

shes back on the rollers tomorro and im goin to flip if shes not near 300whp

iv added a decat,apexi filter,e-manage,bost controler set at 15psi,FMIC,walbro,and FPR.

 

I ran a 14.4 stock,a 14.2 with the nur spec and best i manages with the rest was a 14.001 at japshow last weekend [1st time shes been run since the upgrade]

id say theres a mid 13 there tho as the headwind on sat was quite bad