Most power through E150F transmission?

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Postby vip09 » Wed Sep 02, 2009 12:53 am

Well the first E150F failed from synchro wear. The gears would grind at high RPMs when racing. Eventually something broke.

The second E150F also had synchro wear. Would grind on fast shifts at high RPMs.. didn't last nearly as long as the first transmission. I think I must have sheared the teeth from 3rd gear. (I was also putting down probably over 100whp more on this one).

The third transmission was an E152F. It failed from just doing 4th gear pulls.. I'm still stumped about this one because it was shifting PERFECT before it failed.
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Postby CMS-GT4 » Wed Sep 02, 2009 1:28 am

So if syncros are really your only main issue, I might suggest just using 205 or RC syncros in your old 150 box but get them cryo treated shot peened or something to help make them stronger. It may be easier than trying to source a 205 box at least if you can do the work. See part numbers in the pn thread I linked for your earlier.
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Postby RedCelicaTRD » Wed Sep 02, 2009 2:36 am

vip09 wrote:So Trevor did 700awhp on the USDM Transmission? Has it failed yet?


Trevor has had more t/case and rear diff problems then actual trans problems. However, most of those are launch technique related.
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Postby vip09 » Wed Sep 02, 2009 3:20 am

I have sourced some 205 transmissions and will probably just go with one. It won't be soon though.
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Postby lumbercis » Wed Sep 02, 2009 3:51 am

If you are going to keep drag racing (and I encourage you to do so!) a cheaper alternative in the long run might be to crack open and repair the E150. First, find out what the weak point is, then call someone like Shepherd Transmissions and see if he can make some stronger versions of the parts that keep failing (maybe just synchros).

On the other hand, it may be the case that brand new OEM synchros installed in your old box will do the trick. The problem may not be the strength of the parts themselves, but the years of wear from daily driving.

Or you can break down and get a 205 box. :smokes:
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Postby KORacing » Wed Sep 02, 2009 3:57 am

With worn synchros, the loading on your other internal components will increase. It is cheaper to rebuild and replace synchros on a poorly shifting trans than to replace all the gears and forks on a broken trans.

Synchros don't wear because of power directly. Typically from what I've seen in power related failures, it's the t-case breaking on cars with power, and usually from what I've seen [bold]when using launch control[/bold].
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Re: Most power through E150F transmission?

Postby timmey » Fri Jan 03, 2014 6:39 pm

Hey guys,

My E150F blew up on the dyno recently, at about 320 hp/280 ftlb in fwd mode. Still getting the details on what happened from my tuner ; the gears had very little griding and about 100,000kms on them, so could be synchros.

Anyhow, it looks I'm going to need a new E150F, E151F or E154F :(. If I go with an ST205 E154F, does it bolt on, or do I need the axle stubs and anything else from my current E150F? Basically, how much more work/parts is it to install the E154F?

Thanks!

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Re: Most power through E150F transmission?

Postby KORacing » Tue Jan 07, 2014 12:43 am

It should bolt right in with your same axles. I've done a 205 drivetrain swap into a 185 and kept the same axles, and then it broke the transfer case. I rebuilt the trans and took the selectable t-case off of the former 185 trans and mounted it to the E154 and put it all back together.
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Re: Most power through E150F transmission?

Postby timmey » Tue Jan 07, 2014 1:01 am

Thanks Kris! Great info.

By chance, when you say "selectable t-case" do you mean the "switch" for FWD mode that was NOT on the ST205? I'm very interested in the ST205 trans but need FWD mode for dynoing (although that may be how I ended up here), so I hope that is what you meant. Is it easy-enough to do? ;)

If not, has anyone tried that (E154 trans with the FWD mode portions of the E150)?

Thanks again!

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Re: Most power through E150F transmission?

Postby KORacing » Tue Jan 07, 2014 6:10 pm

Yes that is what I meant. It's an E150F selectable transfer case with the selectable FWD mode I mounted on to the E154F rest of it. It is tricky to get the splines all lined up for the FWD shaft and the center diff input, but I have found a bit of cursing always helps.
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Re: Most power through E150F transmission?

Postby timmey » Tue Jan 07, 2014 6:28 pm

Haha great, I was hoping to do the same. Thanks!

Do you figure the FWD selector weakens the trans at all? Tradeoffs...tradeoffs :)

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Re: Most power through E150F transmission?

Postby KORacing » Tue Jan 07, 2014 8:00 pm

I doubt it weakens the trans while engaged in 4wd mode, but there are less parts to have problems with if it isn't there. That said, the E154F non-selectable center diff some how locked up on this particular car and actually cracked the case in two which is why I had to replace it. It went to the metal recycler afterwards so not sure what got in there to cause it but I assume something locked up in side possibly due to something getting in the gears.

The FWD mode does have smaller shafts running in/out of it than if a car were to have a E series 2WD transmission so that is likely weaker than a modified E153 from an MR2. I've dyno tuned a few Celicas making just under 400whp ok in FWD mode, but probably less than 10 total, and there always seems to be the nagging doubt as to whether or not it will hold up when I'm doing it.
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Re: Most power through E150F transmission?

Postby timmey » Tue Jan 07, 2014 9:23 pm

Thanks again for the info Kris.

Somehow my 90,000km E150F died out at 330hp/290 ft/lb torque in FWD, I think I was unlucky though. My tuner thinks it died at the transfer case/FWD selector (funny enough) cause the trans won't move at all now. Hopefully that isn't where mine died and I can do the E154F swap w/FWD selector that you mentioned.

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