R154? Good or no good?

[TTV8RA23]

Hiro
3.7:1 is the tallest ratio hilux diff head you can get. As far as i have seen hilux diff heads are all interchangeable from now back to early 80s and the tallest that was ever made by toyota was 3.7. There are many many different ratios that are shorter than this 3.9:1, 4:1, 4.1:1, 4.275:1 4.3:1 right up to about 5:1 there are many many different ratios that will all fit. What im saying is the tallest that will fit in the diff housing that i am using is 3.7:1 therefore my reasoning behind wanting a tall 5th gear. Dunno if this clears anything up for you or not ?

And to Norbie i know it is not gonna run on the smell of an oily rag but it should still be nearly as good as factory when just cruising on the highway. I also know it is gonna be extremely hungry when i give it lots of the old right foot. I am not running bigger injectors so it should still be good at low revs etc what im doing instead is putting in a second set of injectors that will turn on when the motors sees say 5psi of boost. Im doing it this way because i have a spare set of injectors lying around and im a fitter and turner apprentice so can do all the work myself with very little cos $100 max for materials etc.
Yep i will be quite happy with it sitting at 2300rpm at 100kmh that ratio ios with the tall over drive model of the TKO600. It would be a fair bit more if I did run an R154, about 2650 if i remember rightly. I did work it out some time ago. It would be even higher if i was to use the V160 but none of this matters anymore cos now im on the hunt for a TKO600. Brand new from the states i reckon! $1995.00 US

Sorry if some of what i have said has caused confusion lol i must say im FARKING confused!!

[Soarer21]

Well I had an R154 in my race car with 450+rwhp and drove it hard, on full slicks and never broke anything. Car weighed 1250kg plus driver and when it was being driven, it wasn't played with. It was either stopped, or flat out... Sure it's not silky smooth on the shift, but Ive driven worse.

[Hiro]

Hiro
3.7:1 is the tallest ratio hilux diff head you can get. As far as i have seen hilux diff heads are all interchangeable from now back to early 80s and the tallest that was ever made by toyota was 3.7. There are many many different ratios that are shorter than this 3.9:1, 4:1, 4.1:1, 4.275:1 4.3:1 right up to about 5:1 there are many many different ratios that will all fit. What im saying is the tallest that will fit in the diff housing that i am using is 3.7:1 therefore my reasoning behind wanting a tall 5th gear. Dunno if this clears anything up for you or not ?

I get what you are referring to, I was just pointing out that what could be the tallest available now might not have been the tallest available ever, or that if it was an early rear-end then new centres mightn't fit. From what you've said, they are all interchangeable (like I said, I know my Corollas not my Hilii), so it's all good then.

[TTV8RA23]

Soarer.
Very interesting! Thats about 300rwkw. What sort od torque were you making? I would love to get hold of hypo77 somehow cos i no he is running an r154 and making 360rwkw. like i say i have heard good and bad. I am still considering keeping the R154 now. I no this is blasphemous on this site but does anyone no anything about the 350Z 6 speed box it has been suggested to me and its quite a cheap option but i have done alot of research and can find very little in the way of feedback verifying there strength or infact condemning them?? Any info would be good. I would love to stay toyota but for the price you pay and if there any good it will be very difficult to walk past. A TKO600 or a T56 isnt even japanese so if i can avoid them i will. Cheers guys!

[TTV8RA23]

Sorry was a double up on posts!

[Norbie]

So what if it isn't Japanese? The V160 is German but that doesn't seem to bother the Supra guys.

[Dieseltrain]

2300rpm inoverdrive might be a tad low if the engine isnt making any positive boost that low down, the engine will be off boost and possibly labour on hills or inclines?

Not sure on your setup or turbos or rpm goals.

[Soarer21]

Soarer.
Very interesting! Thats about 300rwkw. What sort od torque were you making? I would love to get hold of hypo77 somehow cos i no he is running an r154 and making 360rwkw. like i say i have heard good and bad. I am still considering keeping the R154 now. I no this is blasphemous on this site but does anyone no anything about the 350Z 6 speed box it has been suggested to me and its quite a cheap option but i have done alot of research and can find very little in the way of feedback verifying there strength or infact condemning them?? Any info would be good. I would love to stay toyota but for the price you pay and if there any good it will be very difficult to walk past. A TKO600 or a T56 isnt even japanese so if i can avoid them i will. Cheers guys!

450rwhp is more like 330rwkw. It registered that output with wheelspin so it wasn't entirely accurate hence the + after it.
R154 is good, V160 is also good.
Z33 6sp is probably still a little too new to get much feedback on, and it's not really as simple to fit to a Lexus as the others. I'd guess the Z33 box is based on the RB25/R33 box which is supposed to be ok but I think it's still not as good as an R154 or V160.
Im considering moving to the V160 myself for the next evolution of the race car, not because of any tales of strength but for the ratios suiting my needs with the revised setup

[Sciflyer]

2300rpm inoverdrive might be a tad low if the engine isnt making any positive boost that low down, the engine will be off boost and possibly labour on hills or inclines?

If he's running stock n/a compression the off-boost performance will be much better than an equivalent turbo engine, i would be surprised if this is a problem

[Norbie]

It's not even a problem with my 2JZ, 3 litres without boost is plenty to get the car up a hill without changing out of 6th.

[crownman]

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[BlackSupra]

Soarer.
Very interesting! Thats about 300rwkw. What sort od torque were you making? I would love to get hold of hypo77 somehow cos i no he is running an r154 and making 360rwkw. like i say i have heard good and bad. I am still considering keeping the R154 now. I no this is blasphemous on this site but does anyone no anything about the 350Z 6 speed box it has been suggested to me and its quite a cheap option but i have done alot of research and can find very little in the way of feedback verifying there strength or infact condemning them?? Any info would be good. I would love to stay toyota but for the price you pay and if there any good it will be very difficult to walk past. A TKO600 or a T56 isnt even japanese so if i can avoid them i will. Cheers guys!

I would also run a twin plate clutch to ensure longevity of the box. I would be confident that the box can handle 300-350rwkw.

[TTV8RA23]

Hey guys sorry no replys for so long did not notice that it had gone onto a new page so thought it had gone dead.
Im seriously thinking about running the R154 again and just laying off the power a bit and settling for about 280-300rwkw and just keep it as a quick street car as drag racing is something i really wanna get into but i dont wanna be chopping the celica up and putting a cage in it to run fast times so this has since spawned a new idea.
Two projects unfortunately. Im going to build myself a rail once the celica is done with 6 speed 3uz auto, hilux diff, 1UZFE running methanol and twin garret T25s keeping it super light with the internals standard but turning the boost up quite high running alot of advance as the methanol will allow this. hoping for 8.5-9 second quarters It will not be very expensive for me to build something like this as i can do all the work myself and have a good mate who has built several rail cars before that can give me pointers.

His latest which has just been finished is in fact the same sort of thing im doing except he is running old school two speed auto and 9 inch diff and a bloody huge blower and mechanical methanol injection all on a 1UZFE which i no is sacrilege but apparently sounds very very horn!! And running first race next week.

So yep gonna stick with the R154 i think. And yes to Dieseltrain im gonna still be running stock CR so the off boost performance will still be exactly (or near enough too) the same as a NA 1UZFE in a RA23.

Thanks very much guys all your input and ideas have been very helpful. When i get back to NZ ill start up a readers ride thread of my project. Cheers again guys.

[TTV8RA23]

Oh and to black supra yep im planning on making my own twin plate clutch using two 9.5 inch clutch plates and a heavy duty pressure plate my own manufactured flywheel and friction disc for between the clutch discs. Will keep you posted on how this idea works.

[Sciflyer]

Two projects unfortunately. Im going to build myself a rail once the celica is done with 6 speed 3uz auto, hilux diff, 1UZFE running methanol and twin garret T25s

This doesnt really make much sense TBH