jimlab

The 13B-REW is the original engine from your car, and according to Jeff Hoskinson who weighed one prior to shipping on a truck scale, it's about 430 lbs. with intake, turbos, accessories and flywheel.

The stock 5-speed weighs 112 lbs. (dry) by my scale.

Don't know. I've never weighed a complete 2JZ-GTE with accessories, and I'd have to see if I still have the shipping invoice from Powerhouse for the 2JZ core I bought from them.

The Getrag 6-speed is going to be similar to a T56 in weight, and since it's centrally located beneath the car, the effect of any additional weight is negligible.

Approximately 460 lbs. for the LS1 with accessories, intake, flywheel, and cast iron exhaust manifolds.

122 lbs. for a T56 6-speed (dry) by my scale.

I wouldn't worry as much about 50/50 front/rear distribution (which changes the moment the car is in motion anyway, and is affected by fuel level, occupants, and a dozen other factors) but rather in having the car corner balanced with ballast equal to your weight in the driver's seat, which makes its handling far more predictable in both directions.

You'll need coilover shocks for that unless you get lucky.

PSi

As much crap that was spread in this forum i believe i have gained a healthy knowledge of bump steer (even if it is flawed by whoever is right or wrong) this leaves it to me to figure out the rest.. Question to whoever may be able to answer:

What are the dimensions of the 2jz?
Has anyone actualy tried to use a custom oil pan or is it the sump?

Basicly i go around things with most of my "this **** dont fit" situations...
Is this not an option?

I also want to make perfectly clear its a cool project to the thread starter and i wish you all the luck but i would never even think about this swap (mainly cause im biased to Nissan and the ford 2.3t) im just asking these questions because i read 5 pages of threads and about 50 links of useless **** along with the whole trying to grasp the geometry in my head while reading the trash talk, i dearly need these answer to put my mind to rest...

-PSi

wanklin

iTrader: (2)

Bump steer is not a static science by any means, in fact, to some suspension engineers the term is considered arbitrary in anything but a straight line because once you turn the wheels, the pivot points move and our nice little diagrams go out the window. Seeing that we are screwing with the factory geometry by moving the rack the best thing we can do is try get the rack pointed as close to stock as possible and eliminate straight line bump. We accomplish this by getting the steering rack pointing towards the instant center by tweaking/testing arm angle/length adjustments, but this is a less-than-perfect solution since any vertical or horizontal shifting of the rack brings the inner tie rod joints off plane with the inner A-arm pivots thus permanently changing the way the steering wheel interacts with the steering geometry. There's no reason that you can't eliminate straight line bump with this 2JZ configuration, but that doesn't mean that the car won't handle differently due to different toe reactions, CG and PMI once the rack goes off-center.

Howi

iTrader: (2)

Not sure if it's so complicated Rob. Perhaps my understanding with this subject is limited, but I believe that if you move the steering rack up/down, you introduce bumpsteer; whereas if you move the rack forward/backwards, you change the factory pre-set Ackerman. Of course, if you move the rack in more than 1 direction, you'll get a combination of effects.

By lowering the rack, you certainly wouldn't effect your CG (unless you count the weight of the rack and tie rod ends, which I think is negligeable), and I have no idea what PMI is.

I've come to the conclusion, with my swap at least, that the steering rack is not something I want to play around with. I've spent quite a bit of time studying bumpsteer and Ackerman, and in the end, I decided that it's either I figure out how to jam that supra engine in my FD without touch the steering rack, or I'm cutting the damn hood.

I'm an engineer, but certainly not one that specializes in suspension/steering geometry. Until the day I figure it out completely, I decided to leave it alone.

Howi

KaoticFdR1

PMI Potential Maximum Inertia? :::SHrugs:::

dsaggy187

so i have yet to see a rx7 with a 2jzgte including mine driving around ripping it up were is everyone at on there swap

Howi

iTrader: (2)

Look on page 4 of this thread. I have a 1JZ in my FD, running.

Howi

dsaggy187

u have any video's of it

PSi

This is the smartest thing ive heard in this thread... =)

wanklin

iTrader: (2)

Bump steer always exists off center. You create both straight line bump (correctable) and differing rates of turn induced bump by screwing with the rack height. It is not rocket science by any means, but certainly requires a suspension-specific background to figure out how rack movements will affect the mix.

Polar Moment of Inertia. I was actually referring to the car's CG shift due to the new power plant or any other after market component that's thrown on the car.

Good man and nice project BTW.

I'm not an engineer and I don't claim to understand bump steer any more than I claim to understand women. Just sharing my hobbyist-level knowledge of the subject in case anyone is remotely interested. Never to be taken as gospel.

LETHAL RX7

iTrader: (1)

Just got the call from the machine shop.. my engine is done getting machined... get this son of a bitch done soon... yes it has been in the car already and all that.. but still plenty to do.
Greg

sao1

...so when are we going to see some cross member made for the masses or atleast for me?

dsaggy187

what u mean by that?

sao1

When the time comes, can I get the front crossmember made for me?

dsaggy187

love the 2jz to death but man i just seen a 4 rotor that is na and is 600hp sounds like a crazy f1 car man it is sick

roachdiddy

iTrader: (1)

car is gettin there... very little to finish. im going to buy a bump steer kit "if" my car has bump steer. NOW THATS AN EASY FIX!!!!!!!!!!!!!!!!!!
ill take some more pics of the car

sao1

What EMS are you using to run the car?

Yes, more pics!!

I saw your thread of your custom intake for sale in SF, are you replacing it on your 2jz-fd since it is hitting your brake booster?

Dan@ExcessiveAutosports

The steering rack WAS lowered due to the fact that we wanted to tuck the engine lower for hood clearance. How much it was lowered I dont know off the top of my head because I was not the one who built the K member. It has been extensively reworked and I will let you know more exact dimensions when I get time. The bumpsteer issue will be delt with, wont be perfected right away, but such is life.
The AEM EMS is the Supra 30-1100 box.
The intake is being sold for a more favorable custom built one through our shop and Ross Machine Racing material. The brake booster will be re-installed and ran.
If there are any questions that you have about the car, I will swing through from time to time and answer. I will not answer any questions or comments with the sole purpose of starting an online pissing match. I am too busy and grown up to deal with that kind of crap anymore. But other than that, some key parts will be showing up to the shop this week so we will get back to the project as soon as they do. I hope you all enjoy the build and Im sure Matt will keep you up to date with pictures.
Dan

dsaggy187

any updates?

roachdiddy

iTrader: (1)

nope not yet. shop doing it is really busy.

Dr Tweak

Nice project. This thread caught my attention because I'm in the process of wiring up a 2JZ/FD at this very moment. I'll try to get some pics up when it's done (will be a while I'm sure).

-Doc

roachdiddy

iTrader: (1)

little update... finished up the ross machine racing manifold, braced the exaust manifold, installed wastegate, mounted the rad and the fmic, took out all old fuel lines to make room for 2 -10 feed lines and a -6 return feed by 2 a1000 pumps, many other little things finisged also
here are some pics

LETHAL RX7

iTrader: (1)

Is that the new version of the manifold from ross?? i was thinking about putting that on mine as well..?? looks like its coming along well
Greg

dsaggy187

so what does all this fabrication cost from start to finish

roachdiddy

iTrader: (1)

that has yet to be found out?? its not finished yet