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Old 02-24-2019, 04:24 AM   #1
mega_stihl
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M54B30 with Getrag 250. Will it hold?

Simple question: Can a getrag 250 of a 320i hold the power of a M54B30 of a 330i?
Simple question for if my engine built (swap) is complete. Otherwise I have to look out for a ZF 310/320.

Also: iirc a E34 525i M50B25 also has a ZF box. Does this one fit the E46?
(NOT to be confused with E36 325i, which has a getrag)
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Old 02-24-2019, 04:42 AM   #2
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My Getrag 250 from the 320ci has survived 150000 miles with the supercharger, B22 + 8PSI = ~230HP

Now it has moved to the B30 AND with the supercharger and it is still holding fine, B30 + 11PSI = ~370HP
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Old 02-24-2019, 05:21 AM   #3
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Much thanks for your input. Kind regards
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Old 02-24-2019, 11:17 AM   #4
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Quote:
Originally Posted by mega_stihl View Post
Simple question: Can a getrag 250 of a 320i hold the power of a M54B30 of a 330i?
Simple question for if my engine built (swap) is complete. Otherwise I have to look out for a ZF 310/320.

Also: iirc a E34 525i M50B25 also has a ZF box. Does this one fit the E46?
(NOT to be confused with E36 325i, which has a getrag)
It all depends on how hard you push it. The torque rating on a transmission is a maximum value, not an average. Unless you’re racing, revving and dropping the clutch, etc., it should be fine with the Getrag 250.
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Old 02-24-2019, 11:51 AM   #5
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I'll echo that: it depends on how you drive it.

A week or two ago there was a new poster asking why he was breaking output shafts. It turns out that he had welded the diff and was drifting. Even with a stock engine you are going to be breaking parts doing that.

You can double the horsepower of an engine and not break driveline parts if you avoid shock loads. Don't drop the clutch, shift smoothly, and avoid situations where the tires slip then grab.

Last edited by DBecker; 02-24-2019 at 11:51 AM.
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Old 02-24-2019, 03:04 PM   #6
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I do drive my car with care but then again: when I'm swapping an engine to something with 60+ more hp, I'm not planning on driving it like a grandpa. I don't do burnouts and wheelspins and childish stuff like that. I do occasionally track it, and go on a drift day once a year. Drift day being on a wet track where there are not that much traction shifts, as there is very little traction to begin with. So when I say drift, I don't mean redline it all the time like those so called "drifters" do on youtube.
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Old 02-25-2019, 12:30 PM   #7
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Originally Posted by mega_stihl View Post
I do drive my car with care but then again: when I'm swapping an engine to something with 60+ more hp, I'm not planning on driving it like a grandpa. I don't do burnouts and wheelspins and childish stuff like that. I do occasionally track it, and go on a drift day once a year. Drift day being on a wet track where there are not that much traction shifts, as there is very little traction to begin with. So when I say drift, I don't mean redline it all the time like those so called "drifters" do on youtube.
Track days and/or drift days with +60hp? Yeah I'd say you would need a new gearbox, among other things. Time will tell you what specific parts you will require when the time comes. If you are trying to talk yourself out of spending money on a stronger box up front, a couple of track days with the stronger engine should work that one out for you. Normal spirited highway driving you may just get away with the weaker box.
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Old 02-25-2019, 02:09 PM   #8
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Track days and/or drift days with +60hp? Yeah I'd say you would need a new gearbox, among other things. Time will tell you what specific parts you will require when the time comes. If you are trying to talk yourself out of spending money on a stronger box up front, a couple of track days with the stronger engine should work that one out for you. Normal spirited highway driving you may just get away with the weaker box.
Quote:
Originally Posted by paraklas View Post
My Getrag 250 from the 320ci has survived 150000 miles with the supercharger, B22 + 8PSI = ~230HP

Now it has moved to the B30 AND with the supercharger and it is still holding fine, B30 + 11PSI = ~370HP

Well these posts are very contradictory.
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Old 02-25-2019, 02:34 PM   #9
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Well these posts are very contradictory.
Don't listen to Paraklas. He lives in Cyprus - the island just isn't large enough to drive the car properly.
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Old 02-25-2019, 03:13 PM   #10
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If you're planning on doing trackdays, make sure to install the reinforcement plates for the rear subframe.
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Old 02-25-2019, 03:41 PM   #11
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Well these posts are very contradictory.
I just stated the facts.

Car has now 230000km. 220000 with 2.2 + 8PSI and now another 10000 with 3.0 + 11 PSI.

With the getrag 5-speed, 330 clutch.

Maybe it will blow tomorrow maybe I'll snap an axle. For sure I am not going to change the transmission while it's functioning properly.
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Old 02-28-2019, 12:01 PM   #12
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Originally Posted by paraklas View Post
I just stated the facts.

Car has now 230000km. 220000 with 2.2 + 8PSI and now another 10000 with 3.0 + 11 PSI.

With the getrag 5-speed, 330 clutch.

Maybe it will blow tomorrow maybe I'll snap an axle. For sure I am not going to change the transmission while it's functioning properly.
Fair enough. Perhaps OP should just do the same, save some money. But the 250 was engineered for reliability with the 325 and below; stock 330s had a stronger gearbox. It would drive me nuts knowing I had the weaker box and could not confidently let er rip without being paranoid about breaking something and having to go in again and fix it. I'd rather front-end it and sleep at night. It is better to have it and not need it than to need it and not have it. Being stranded sucks also, despite roadside assistance.
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Old 02-28-2019, 01:31 PM   #13
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Fair enough. Perhaps OP should just do the same, save some money. But the 250 was engineered for reliability with the 325 and below; stock 330s had a stronger gearbox. It would drive me nuts knowing I had the weaker box and could not confidently let er rip without being paranoid about breaking something and having to go in again and fix it. I'd rather front-end it and sleep at night. It is better to have it and not need it than to need it and not have it. Being stranded sucks also, despite roadside assistance.
Then you'll move to the next weaker part;
1. Clutch
2. Guibo
3. Halfshafts, not sure if the driveshaft is also different..
4. Rear Bearings (larger due to halfshafts)
5. Brakes (not weaker but smaller in <330, but would drive me nuts too)
6. Diff (if its the 168K case, very common outside US)
7. Subframe mounts (just increases the possibility of breaking)
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Old 02-28-2019, 01:56 PM   #14
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Originally Posted by paraklas View Post
Then you'll move to the next weaker part;
1. Clutch
2. Guibo
3. Halfshafts, not sure if the driveshaft is also different..
4. Rear Bearings (larger due to halfshafts)
5. Brakes (not weaker but smaller in <330, but would drive me nuts too)
6. Diff (if its the 168K case, very common outside US)
7. Subframe mounts (just increases the possibility of breaking)
Don't worry about these things. This question was specific about the gearbox. I stripped an E46 330i but it was automatic, so didn't get the tranny from it. Diff is 3.46 now, 188mm. In time I will swap the entire to the 330i one, so I can also get the rear brakes without having to modify the E-brake, chassis reinforcement plates will be done at that same time ofcourse. Output axles will also be replaced to the thicker 330i ones. Front brakes are already 330i.
Clutch and flywheel will be replaced along with the engine swap.
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Old 03-01-2019, 12:56 AM   #15
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You'll be ok. Be gentle in first, and don't dump the clutch hard.
Torque breaks transmissions, horsepower wears them out.
But they're designed to withstand everything the original engine can throw at them,
driven abusively. So driven sympathetically, it'll manage. The b30's only an increment bigger, not an LS1.

Let's face it- if it goes, you'll upgrade the transmission,
which is no different than... upgrading the transmission now,
except you'll do it later. IF it breaks...

t
keeps spares of most things.
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