High RPM shifts, W58 or R154?

[GST95]

Is there a different toyota forum that might have better input on these questions?

Does anybody know any links that will help answer some of these questions?

After a little more research I think the tranny I have is actually a w55.

[ravenmaster]

First off your question was answered the R154 tranny is a very robust and reliable tranny. It is one of the most heavy duty sport type trannies ever designed by toyota and dare i say it by anyone. So there you go.

[SideWinderGX]

Originally Posted by GST95

Is there a different toyota forum that might have better input on these questions?

Does anybody know any links that will help answer some of these questions?

After a little more research I think the tranny I have is actually a w55.

you want the R154, overall its a stronger transmission and can take a lot more power than the w58 can.

there is this forum, Supraforums, and SupraMania - Powered by vBulletin. stay between these three forums and youll be fine for all the information that you need.

there were diagrams of a w58 and r154 to tell them apart, but i dont have them bookmarked or know offhand myself...im automatic. ill browse for em, but cant promise ill find them.

[Supra Goddess]

W55 gear ratios

1st 3.566 2nd2.056 3rd1.384 4th 1 5th 0.850 reverse -4.091



W58 gear ratios

1st 3.285 2nd 1.894 3rd 1.275 4th 1 5th 0.783 reverse -3.768



R154 gear ratios

1st 3.251 2nd 1.955 3rd 1.310 4th 1 5th 0.753 [b]reverse -3.18

[SideWinderGX]

duh, im stupid, its a sticky lol.

http://www.toyota-supra.info/forums/...-w58-r154.html

[GST95]

Thank you for all the feedback.

My main question hasnt really been fully addressed yet.

I know the r154 is extremely strong, but it is also bigger and heavyer.

The w58 is decently strong and is smaller and lighter.

If I put this setup in a really small car i might not be able to fit a r154 without cutting out and reshaping the tunnel. If it does go into a light car, there will be less strain on the tranny because it is easier to push less weight. So, 400hp in a 3500lb (I dont know what your cars weight) might be max for the w58, but 400hp in a 2000lb car may last for 50k miles.
For that reason I stated in my original post that I dont want to know what will or wont work. If I go with a mid-heavy weight car I know I will need at least a r154, but I am exploring my options right now. I may decide that a 3rd tranny from another make might work better for me than the r154. Im just looking for consistant max rpm shift points right now.
If X tranny can hold 2000hp, but cant shift above 6k rpm it will be useless for what I am trying to build.
I hope this better explains what im trying to figure out here.

The engine that im using has a stock rev limit of 7500. For this project it will be setup for somewhere between 7500 and 9000 depending on many variables.

Will I be able to consistantly shift either of these trannys at this rpm in stock form and if not is there anybody that makes upgraded syncros or anything to help them?

Thank you

[supramacist]

Kinda thought we answered that.

[ravenmaster]

BTW I believe the redline for the R154 is higher than the W series tranny, I could be wrong though. Also our gross wieghtage for turbos is roughly 4400 Lbs., or 2000 Kilos. I know the redline in my R154 turbo is 7500 RPM. However for your needs your contridicting yourself. You want a lighter wieght tranny that has higher RPM then you are looking at the wrong two series trannies. Either your going to get higher RPM from the heavier tranny or lower redline from the lighter one. I would suggest getting a diffrent series than the R or W. Sry bro. Good luck with your project
Oh and btw if yoru doing what I think your doing the W58 wont do, your going to need a stronger tranny, plus you have other factors to consider here, flywheel, clutches, etc. its not just reliant on the tranny.

[GST95]

Originally Posted by ravenmaster

BTW I believe the redline for the R154 is higher than the W series tranny, I could be wrong though. Also our gross wieghtage for turbos is roughly 4400 Lbs., or 2000 Kilos. I know the redline in my R154 turbo is 7500 RPM. However for your needs your contridicting yourself. You want a lighter wieght tranny that has higher RPM then you are looking at the wrong two series trannies. Either your going to get higher RPM from the heavier tranny or lower redline from the lighter one. I would suggest getting a diffrent series than the R or W. Sry bro. Good luck with your project
Oh and btw if yoru doing what I think your doing the W58 wont do, your going to need a stronger tranny, plus you have other factors to consider here, flywheel, clutches, etc. its not just reliant on the tranny.

I dont see where you think I contradicted myself. Read my post again. How heavy a tranny is generally has to do with its strength, not its shift points. I was refering to weight of the vehicle, not the tranny. The purpose of the transmission is to transmit the power to the diff. If the vehicle weighs less, it puts less strain on the tranny to transfer the power, therefore you can run more power through any tranny if you cut alot of weight from what you are trying to move. Its the law of physics. It also isnt what my question was. I am only asking about how high can you shift these trannys? I think you guys are either confusing shift points and redlines (engines have redlines, but ive never seen a tach that is driven by the transmission. Trannys have shift points), or you are not understanding my question.

For your other factors I need to consider. Different bellhousing, fwd dsm flywheel rebushed for input shaft, toyota clutch disc, mitsu pressure plate. I wouldnt waste your time with questions about shift points on your trannys if I havent figured out if I can even use them.

I think im going to have to look elsewhere for answers. It seems nobody here has a high rpm engine here to even give any first hand info on what im asking. Thanks anyways.