9"diff into ma61 conversion

[Robbos_Toyotas]

ok so i expect to be flamed for this but anyway.
Building up a wild 2jz motor, and the f series isnt going to cope nor ever get down any sort of power.
So the plan is to tub the car, somehow shoe horn a cut down 9" diff in there somewhere.
Already have a disc brake 9"here just awaiting either air locker or true trac n appropriate ratio. Probly look at running a th400 tranny or worked a340
I dont think bolting in the diff will be the hard part....there will obviously need to be floorpan and maybe rear chassis mods...the suspension may be a right pain in the ass however....
anyone got any ideas on what i can do?

Can i get a 4 link road registered?
What other options are there other than leaf springs with cal-tracs?

Blake

[old_school_jap1]

I hope you don't get flamed for this, it is Toyota's bad IRS design that needs fixing RA60s had live axles and were coil springs and are the same chassis as ma61s from the firewall back (albeit with a live axle). I guess you could go to the trouble of cutting the floorpan out of one of them and putting it in.

[thechuckster]

graft in a JZA70/80 rear subframe and sell the 9" to random bogans via eBay?

[ddeane]

Blake

Whether you get flamed or not I cannot think of too many high power cars that stick with the IRS rear end. Apart from the difficulty in getting power to the ground 'cos of camber change the weak link is always going to be the CV joints. For instance the V8 supercars run a live rear axle and I noticed at Toyfest on Sunday that the IS1000 (a red hot IS200 with a 2JZ) had moved to a 4 link suspension. It also seems to be an early modification for quick Falcons and Dunnydoors.

You will have to talk to your engineer but I am sure that you should be able to do something. If you have a look in the Street Machine and Street Rod type mags and the modified Ford mags you will find a number of willing sellers of fabricated rear subframe kits with 4 link and a 9 inch in place. Maybe have a talk to Castlemain speed shop. Often these items come with an engineering certification.

Good luck

Cheers Craig

[Robbos_Toyotas]

graft in a JZA70/80 rear subframe and sell the 9" to random bogans via eBay?

mate thats just as expensive as doing the 9" by the time i buy it as an lsd, it is weaker (justengt8 is having issues with his with only 300 oddrwkw), theres less ratios available, lsds are cheaper for a 9" and i know il never have a problem with it...i can throw as much hp as i want at it and i know it wont break with 325 or larger slicks. Also the fact IRS squats under power, sold does not.

Blake

[Robbos_Toyotas]

Blake

Whether you get flamed or not I cannot think of too many high power cars that stick with the IRS rear end. Apart from the difficulty in getting power to the ground 'cos of camber change the weak link is always going to be the CV joints. For instance the V8 supercars run a live rear axle and I noticed at Toyfest on Sunday that the IS1000 (a red hot IS200 with a 2JZ) had moved to a 4 link suspension. It also seems to be an early modification for quick Falcons and Dunnydoors.

You will have to talk to your engineer but I am sure that you should be able to do something. If you have a look in the Street Machine and Street Rod type mags and the modified Ford mags you will find a number of willing sellers of fabricated rear subframe kits with 4 link and a 9 inch in place. Maybe have a talk to Castlemain speed shop. Often these items come with an engineering certification.

Good luck

Cheers Craig

yeah i think theres a few places that do this...reading street machine and there is a few in there...i didnt think you could get a 4 link registered?

Blake

[AL510]

Have a look at the Mcdonald brothers website, there is a street four link kit on there.I think the problem with rego and four links is the welded tubes and steel rodends but their street kit uses teflon bushed ends or similar and appear to have one piece tubes.

cheers, Al.

[Shakotan_Aaron]

i thought tubs where illegal for a street rego'd car??

[thechuckster]

mate thats just as expensive as doing the 9" by the time i buy it as an lsd, it is weaker (justengt8 is having issues with his with only 300 oddrwkw), theres less ratios available, lsds are cheaper for a 9" and i know il never have a problem with it...i can throw as much hp as i want at it and i know it wont break with 325 or larger slicks. Also the fact IRS squats under power, sold does not.

well if RZ can attach 315/30/18 rubber on the rear a JZA80 and feed ~600 rwhp @ 2 bar thru the stock JZA80 diff and it's still running after 4 years ... I'd say the JZA80 unit is quite robust.

[Robbos_Toyotas]

well if RZ can attach 315/30/18 rubber on the rear a JZA80 and feed ~600 rwhp @ 2 bar thru the stock JZA80 diff and it's still running after 4 years ... I'd say the JZA80 unit is quite robust.

but the complete "B" series jza80 diff is either 8.75 or 9" and is worth a fortune to buy. im sure you can get any g/b/a series irs to handle it, all depends on the $ you have. look at shane with 1jz747, he has billet? half shafts and i would assume has spent plenty on irs to keep it where it runs. and i believe he hasnt gone for solid axle because he wants to keep racing in a class...correct me if im wrong but a 1.5jz with 900rwhp should run better than 9.2 i believe?

[Norbie]

Live axle is the way to go if straight-line fasts is your thing. I'd be taking a completely different approach though, and stuffing that "wild" 2JZ in a different car which already has a live axle. There are plenty to choose from, even if you want to keep it in the Toyota family. Just off the top of my head, how about an MX32 which will easily accommodate a 2JZ and weighs about the same as (or less than) an MA61? Or you could 2JZ-ify an old Ford/Holden/Chrysler and give the bogans a conniption. I always thought a Charger with a built 2JZ would be cool.

This is the route I would take, mostly because I'm lazy. Stuffing a 9" in a car already setup for live axle is way easier than any IRS to live axle conversion.

[gianttomato]

I'd like to see one in a Capri, the cool one, not the fucked up hairdresser lemon shitbox fagmobile.

[MWP]

You also need to think about suspension performance if you ever want to drive this car on the street or around corners.

Big heavy diff in lightish car = high unsprung weight to body weight ratio = very bad rear suspension handling & possibly dangerous

[1JZ.747]

but the complete "B" series jza80 diff is either 8.75 or 9" and is worth a fortune to buy. im sure you can get any g/b/a series irs to handle it, all depends on the $ you have. look at shane with 1jz747, he has billet? half shafts and i would assume has spent plenty on irs to keep it where it runs. and i believe he hasnt gone for solid axle because he wants to keep racing in a class...correct me if im wrong but a 1.5jz with 900rwhp should run better than 9.2 i believe?

ok just to correct you here dude, i dont run billet half shafts, my rear end is all factory toyota excluding the control arm bushes at the front and the bushes that locate the diff in the cross member, the rest is how it came from toyota in 1991.

my diff centres are welded up, nothing fancy there, the money i have spent on buying 3.7 ratios and having them put in with new beaings has cost me $2200. the IRS is costing me easily .8 of a second which is a long time in drag racing. i would love to put a 9 inch in my car but keepo the factory chassis rails. i could easily fit a 11.5 inch slick under it and my chassis guy who does my roll cage etc tells me that he would expect low 1.2 sixty foots with a 9 inch and that size tyre, that would put me very close to a 7.8 with the power and weight i currenlty have. the diff conversion would save more weight too.

put the 9 inch in it, the jza80 diff is dumb, sure 1 guy has arun a 7 sec pass in a light weight jza80 but the cost of centres, metal bushes all round and playing with it over and over again it has cost him far more money and headache.

a fully sorted 9 inch into my car keepin gthe facotry chassis rails is $10 grand inlcuded the diff the diff centre, 4 link, billet axles and tin work.

not bad but i dont have that sort of coin laying around and wont have for some time yet.

shane

[brett_celicacoupe]

mate thats just as expensive as doing the 9" by the time i buy it as an lsd, it is weaker (justengt8 is having issues with his with only 300 oddrwkw), theres less ratios available, lsds are cheaper for a 9" and i know il never have a problem with it...i can throw as much hp as i want at it and i know it wont break with 325 or larger slicks. Also the fact IRS squats under power, sold does not.

Blake

http://www.toymods.net/forums/showthread.php?t=50146


and im pretty sure justen doesnt have a JZA80... its somthing else.