change of plans

[kwayzivietnamese]

Change of plans

[Mugs]

Have you visited
http://soarercentral.com/cgi-bin/sc-forum/discus.cgi?
I'm pretty sure they have the answers you're looking for

[big_zop]

Once you start opening things up and replacing/rebuilding, you will soon find that this wont be a budget build.

There are threads avaialble for a 1.5JZ and i dont know the details too well except that there might be a bit of tweaking involved (though none of the threads i know of mention a VVTi head). But the general census is that unless you have a lot of work dont to your 1JZ and will loose all that work (manifold, turbo, head work), then its generally better just to swap for a full 2JZ.

Sorry that all my answers arent in order, just writing what i can see:

- Sumps are all interchangable, it will depend on what you need for your application.
- The R154 will bolt up to any JZ bottom end with a JZ bellhousing (which it already has).
- There might be minor differences between the non-VVTi and VVTi engine other than the head differences. I know that there is different compression 8.5:1 for non and 9:1 for VVTi. I know that there are differences in the block for the 2JZ between the VVTi and non but i dont know how this affects the 1JZ.
- Bottom end rebuilds arent cheap if you want to do it properly and the same goes for head work and cams - it wont be cheap.
- Upgraded valve springs are more for high revs and are used to prevent valve float.
- cams and cam gears are the last thing on your mind if you want to get power. let us know what you have already done and people can advise fromt here. we dont know if oyu have a stock engine or not. you should be doing the basic breathing/tuning mods first before thinking of cams.

Remember, take on this information and do some more research. if you have any more questions then post up again. And same goes when you find out some answeres, post them up for everyone else.

One question for you, what car is this for as it seemed like you said the engine/trans were FROM a JZX100 rather than this is for a JZX100.

[wilbo666]

Some good points have been made here...

You say

injectors, manifold, single turbo etc etc

What is the etc etc? And is it inlet or exhaust manifold you were talking about?

If there is nothing wrong with the new engine, I'd look at selling it and getting a 2JZGTE! I think as mentioned it would be much more cost effective. Especially as you were only going to build up a stock bottom end...

If the manifold you were talking about was the turbo manifold then it might not make a difference as you mentioned changing turbo stuff as well (Might involved a manifold change? )...

Help us understand why you want to go the 1.5JZ route if you would!

Your Questions:
- Is there any differences between non vvti and vvti 2jz bottom ends? Is it correct to assume that the only difference with vvti and non vvti engines are the heads?
>>The cranks, pistons and rods are the same I believe. The block casting for the engine mounts is slightly different I believe (going off the Zoom article when he put the 2jz vvti in his MZ20)...

- Is it correct to assume that the 2jz bolts directly up with the 1jz vvti head? Would i have to change anything over from the 1jz bottom end? Like sump or anything at all?
>>Not sure about 'direct' bolt up. You may want to look into the oil feed in the head discussed in other 1.5jz threads.

As said, sumps are interchangeable.

- Is it correct to assume that the r154 gearbox will still bolt straight up without any issues to the 2jz bottom? Engine and gearbox mounts still retained with the 2jz bottom?>>As said, gearbox bolts up fine.

See my previous comment about engine mounting on the block being different to 2jzgte vvti vs 2jzgte non vvti.... the same may / may not apply to 1jz vvti (I don't know!)

- Since the bottom end will be 3L, and abit more power will be pushed throught the motor, i am told its worth it to upgrade to HD valve springs?
>>Not a bad idea.

- Since the head is being pulled apart, i was wondering if it is actually worth upgrading the cams and cam gears too? Are there really any gains to be made? If so, what is the best option for me? Again, anyone know of bargains available atm?
>>Again, gains to be had, but not cheap

It might be worth looking into putting large valves in (i.e. 2jzgte intake are larger than 1jzgte non-vvti)

You'll only be able to use one cam gear, on the exhaust due to the VVTi

Cheers
Wilbo

[kwayzivietnamese]

change of plans

[wilbo666]

As this must be whatthe's IS200

OK.

You also have another problem, and that is I don't think you can put a 'younger' engine into an older car. So you can't legally simply put a 2jzgte (non vvti) in I don't believe.

If you could tho, this would be my plan...

>Get 2jzgte (JZS147) half cut, ~$2500. (swap sumps, sell other half cut parts)
>Get new turbo and manifold
>Get new larger injectors
>Sell your existing package which is very good!

In my plan you will be able to recoupe money from the existing engine, half cut and you save a small fortune not building up a stock engine

Cheers
Wilbo

[The Real Roadrunner]

i would have to agree with wilbo666 on this one.

remove old package and drop in a VVti 2jz as it WILL be cheaper in the longrun and you won't be pulling apart a package that is already perfect.

Cheers
Linden

[big_zop]

Looks like he's taken your advice - http://cgi.ebay.com.au/ws/eBayISAPI....m=250314869016

Wonder whats in store for it, going to keep us updated?

[MR22ZZ]

why ruin a perfect car?

**face-palm + shakes head**

I am really really wishing I had the cash back when Matt was selling this thing.

[The Real Roadrunner]

why ruin a perfect car?

I don't know how you classify improving the car as ruining it, the new setup should have more average power (ie everywhere above idle) and a fair whack more top end if the right components are selected.

if you went for a drive in Dravens supra and then jumped into the IS you would know what i mean.

[MR22ZZ]

if that IS the way it's heading that this is good news.
But I still can't understand why you would ruin this car to do such a thing.

Why not use a standard IS300?

I actually still feel that Mos' 1UZ IS200 is a better package than this car but I wouldn't rip the 1JZ out to stick a 1UZ in.

[tomvale13]

Aren't they bigger, heavier and gayer? (personal opinion on the latter)

Had a mate who thought they were the same, I thought the 200's were distinctly smaller and 50/50 almost?

[Draven]

Tom: than an IS300?

IS300 is essentially the same as an IS200, except 2jz-ge vs 1g-fe. I quite like the IS300 - some people have claimed it ruins the weight distribution, but there's only the barest hint of understeer - doesn't feel at all nose heavy.

And agree with linden - 2jz-gte vvti is going to improve on the 1jz-gte vvti in pretty much every area with no noticable downside

[kwayzivietnamese]

Hi guys,
yes i am hopefully "improving" the overall package ..
After speaking to Brett, i have decided to go 2jz non vvti as the aftermarket support for it is abit better and he stated why spend more on vvti when you can save $$$ on non vvti and achieve the same results

[The Real Roadrunner]

he stated why spend more on vvti when you can save $$$ on non vvti and achieve the same results

Yes and no, it wont give the same result as the VVTi gives adjustable lobe centres therefore more average power, but they would both have the same peak HP.

ill reply to your PM as soon as i get time but its a long answer and i type slow

Cheers
Linden