New 5th gear for the R154 - how about a taller overdrive?

[bkma71]

Woot woot!! Silver state mile here we come haha. jk.

how much strength comparison loss are we talking here? I may be interested in one of course depending on price, could you also pm me a price on what you would be charging for full rebuild service, just trying to get a ballpark idea.

 

[Moy]

Doward, probably better to post up a ballpark estimate of how much you charge for a rebuild. I know that I, along with a few others who have posted in this thread, are interested.

 

[Zazzn]

totally want something like this always thought the 5th was too short especially because of the 4.30 that i have

 

[Jayhall]

4.30 guys will probably be all over something like this, lol!

your damn right! When you know how much your going to be asking, please let me know and I'll get it to you asap. I hate my 5th gear on the highway

 

[Doward]

I gotta get approval and such for all this, guys!

There's also the matter of my usual "Test the hell out of it before releasing it for sale "

 

[Moy]

I gotta get approval and such for all this, guys!

There's also the matter of my usual "Test the hell out of it before releasing it for sale "

True, but still... approximate price with new gear and without? :icon_bigg

 

[Justin727]

Doward you Lunk... Where were you and all this stuff popping up for th R154 about 2 years ago when I had mine apart.

 

[Doward]

I was busy designing oem 13" front brakes for a killer price

I'm still waiting to hear back from the cryo guys before I get an approximate price. I'm aiming under $500 for the set.

I said it before, I'm not doing a giant production run on these. I'm not wanting this to turn into a huge ordeal for me like the front brake kits turned out to be.

Same with blueprinted transmission rebuilds. I'm looking around $450-500 + parts, and I will be doing NO MORE than 2 of these. Just swapping the gears and giving everything the 'once over' will be around $300 + parts, no more than 3 of these.

I love bringing new items to the market, but I don't have the extra time to dedicate large quantities of it!

 

[adampecush]

Where were you and all this stuff popping up for th R154 about 2 years ago when I had mine apart.

my thoughts exactly!

 

[gtsfirefighter]

My goal is to push 30+ MPG from the Supra on the highway

My A340E and 91 couldn't do it with cruise control at 70mph.

I can't quite get there with mine either. Same year/tranny. 27 mpg is the best I've gotten so far. The car is completely stock.

I can do the math, since I know the formula. But I want to be spoon fed.

:biglaugh:

A 3.73 / 0.66 setup would be GREAT for someone just looking to cruise in their Supra.

Like me. :wavey: It's not all about the HP but the experience just cruising down the highway. If I had an R154, which could be a possiblity as I still consider a swap, I'd be all over this. So I'm subscribing to keep up.:icon_bigg

 

[Nick M]

.7 with a 3.73 will get you this. For refrence only. That is also a "stock diameter" tire. .7 doesn't bog the engine.

I would also think there are other choices besides the .75 and .78 of the R and W trans.

 

[Clueless]

damn, wish I still had my 4.30 and r154

 

[Doward]

Nick, that's exactly what I'm thinking. The difference between the r154 and auto done again and you've got what I've built.

I think it'll really open up more options for guys. A lot of pre-'89 guys focusing on MPG have been looking for 3.73s (hell, I was one!) and this would work better, while still having the same 0-130(ish) characteristics of stock. That's more than most here run in the 1/4 mile, guaranteed

 

[nuggets]

I have an 89+ with a 3.73 and R154 (I did the auto to manual swap). I'd be interested to hear how that testing comes along. I have 235/40WR-18's on the rear. I wonder how that would affect the performance? If it looks awesome for cruising, count me in for one

 

[Doward]

I'm sure it will - I think your 18" tire is taller than stock.

 

[SupraMan1987]

Doward, I think you opened up a can of worms here man. Any news from mods on starting a possibly GB? With a deposit and then final payment when you have the stuff?

 

[Doward]

I shot Shaeff a message. I assume the powers that be are discussing it amongst themselves?

 

[zachm611]

im interested as well, gotta come up with a r154 as i am currently still w58 but if these aren't going to be mass produced then i may as well get one when i can and let it sit on the shelf til i get a r154

 

[Clueless]

Hey doward, you're going to be running some long term real world test for these right? Just saying, before you sell a bunch of them....

 

[QWIKSTRIKE]

Yep. I've had the prototype sitting here for about a week now. I'll be finishing up the 13" front brakes this weekend (finally!)

My original idea was to go to a T56. Then I started playing with the idea of just replacing the 5th gear.

Benefits? Well, no custom work needed - just swap the 5th gear! Lower highway rpm = better gas mileage.

*EDIT* @ 70mph

Stock is a 0.753. ~2800 rpm on a stock 3.91 rear equipped Turbo model. You 3.73 guys are running around 2650 rpm.

You 4.30 guys? Damn near 3100rpm!

The 5th gear I've put together here is a 0.66 overdriven gear.

The results?

3.73s = ~2350 rpm from ~2650
3.91s= ~2450 rpm from ~2800
4.30s= ~2700 rpm from ~3100

These calcs are all on stock 225/50/16 tires. What kind of real-world difference will they make? We'll find out when I throw the fresh r154 in Jeff's Supra.

I think Jeff is liking being local to me

Cons? The new 5th gear is physically smaller than stock - so naturally, it is slightly weaker. My solution to that? I'm going to cryo treat it.

And YES - I'm working on rear brakes, guys!! No plans for doing a GB just yet - I have to contact a moderator first.

Or if one wants to chime in here, that'll work too.

So what do you guys think? Any interest in a new taller 5th gear?

Great idea bud just that I want a taller first gear.... so me tinking about TKO500 tranny unless that lower ratio rear end group buy ever gets under way.

I am spinng 7200rpms now and may and possibly spin 7400rpms with my new setup! 46+ mph 1st gear would be lovely