M30B35 Swap FAQ

[Brad D.]

Excellent post Matt.

[Heathcliffe]

Ummmm... wow... extremely detailed, helpful and a bit overwhelming. Thanks for all the info.

[Jean]

The m10 5speed TPS is the same as the m30b35 5speed tps

[draztik]

Some pics.

M30B32


Early M30B35. Head is stamped '87


M30B35. Head is stamped '89


As you can see the early b35 looks almost identical to the m30b32/m30b34. Aside from the obvious differences, it has virtually the same block casting design. It uses the same oil pan along with the alternator/power steering mount as the b32/b34. Notice the block of the later b35, it's a different casting design with a different oil pan. I thought this was interesting.

[shocka]

Amazing swap thread detail boys. Look at the difference in intake runners b32/35 i cant wait.

[sfdon]

The question I have is will a m30 b34 HEAD fit on a m30 b35 bottom end? What will the c/r be? Anyone done this"?

Thanks!

[Area 52]

The question I have is will a m30 b34 HEAD fit on a m30 b35 bottom end? What will the c/r be? Anyone done this"?

Thanks!

Hey Don!...hope all is well.
Scroll down on this link for m30 compression ratios (excel calculator):
http://www.mye28.com/viewtopic.php?t=50038

-Kevin

[sfdon]

Hey Mr. D-

sadly that is a dead link...

[LA]

I'm replacing a cracked oil pan on my '88 535iS M30 b34 and noticed the block has the threaded bosses that permit early, E28, or later E32/34 mounts to bolt on...I had only heard of these blocks being in E24s.

Apparently some '88 E28s also had blocks with both mounting patterns.

[Manny D.]

No, the transmission doesn't matter. It has its own ECU and is totally independent from the engine's ECU.

I was told that if you are running the automatic 4hp22 EH you will need the 6 pin TPS versus the 3 pin that is used on the E34 manual harness..

[LA]

Thanks bimmerguy for the excellent post. I just keep learning differences - I did not know the AFMs were different.

Is the internal dia different? What other things are different?

Thanks!

[CSBolger]

Thanks bimmerguy for the excellent post. I just keep learning differences - I did not know the AFMs were different.

Is the internal dia different? What other things are different?

Thanks!

They're not;

Air flow meter-same as the m30b34 air flow meter (part number 0280203027)

[Manny D.]

Also, if you are running a 4hp22eh you will need to make an adapter for the c238 connector beside the ecu in the glove box.. I am in this process now..

[LA]

Thanks bimmerguy for the excellent post. I just keep learning differences - I did not know the AFMs were different.

Is the internal dia different? What other things are different?

Thanks!

They're not;

Air flow meter-same as the m30b34 air flow meter (part number 0280203027)

Thanks! Sorry I missed that in Matt's post.

Glad to know I don't have to rundown a new AFM.

[itsbrokeagain]

this is gonna be a great swap.

I just picked up my M30B35 out of an E32 last week. Going to start stripping it down soon and sending parts off to get hotanked/beatblasted/powdercoated etc. for $250 including the AC and alternator I can't go wrong

The biggest thing I wanted to know what was 1.3 harness to use, as mine was a bit dryrotted and beat up (not to mention my friend cut it when they yanked it out of the donor car he had, they used it for body panels to resurrect his own E32), so im most likely going to purchase it brand new from the dealer (always helps to have a sick discount there too)

im going to run that part number tomorrow and see what price it comes up with..

[Bimmerguy2002]

you dont wanna buy a harness new....you can use an e34 or e32 non eml, or a super eta e28 harness.

[shocka]

If your swapping a b35 into a 533i and want to use the b35 p/s pump. You need:

32411132526 (e28 535i pressure line)
32411127343 (e28 535i return connector)

As well as a slightly longer return hose, the 535i one works perfectly.

[e30-m30_kid89]

So, I have a b34 in my e30 with B34 specific swap mounts..If I get that adapter I can re-use them with the b35??

Sounds so...simple! Im so doing it!

[poorguy]

anyone can give me the dimension for the engine moust adapter?I am not in US,so I have to make one by myself.
thanks for your help

[ACSchnitzer]

Hello! I bought an m30b35 engine with "all" electrics and 4hp22 automatic. Engine is from E32 it`s the newest 1.3 motronic and the car where i am mounting it is 518i.
We made the motor brackets last night, and now we are making the gearbox bracket.
Problem is joining m10 fusebox and other electrics with the e32 harness together. i am wondering if the roundconnector to engine is same in all m30b35 engines so i can wacth the pin places from pic what is ment for e34 change to e30 318i..
Or is here anybody who has done same job what i am doing.

Regards . Suni

Sorry my bad english

[rmiddendorf]

You guys are making me think of keeping my e24 just as a parts car...

Anyone know if the ECU from an Auto (the 88) will work if swapped into my 5-speed E28?

[fastpat]

Some additional M30B35 photos.






The dual mount engine.

[Nosis]

I finally got my temp gauge working on my b35 by using the sender off of a b34 engine. The resistances are different, and "switching the wires" on the b35 sender won't do jack... The b34 sender is has different resistances and a spade style connector. It uses the block for ground where as the b35 has a separate wire for ground, that believe to be one of the MANY leftover wires when using the E34 B35 harness that don't get hooked up to anything.
Anyway, works good now, and the b35 is freakin awesome!

[shocka]

X2 This was the last missing piece of the puzzle for me. Thanks Nosis. b32 sender should work too

[derrith]

I was digging this info up for myself and thought I'd post it here so it's with the rest:

Motronic 1.3 e34/e32 25 pin fusebox connector pinout:

pin 1: Blue/White Oil Level Static
pin 2: Blue/Yellow Oil Level Dynamic
*pin 3: Red/White 12v ABS Power
*pin 4: Not Used (M5 Only Brown/Blue Full Load Compressor Cutoff from Air-Intake Control Unit)
*pin 5: Black/Grey Pressure Switch Compressor Relay
*pin 6: Black/Blue Auxiliary Fan (ECU Aux Fan On Alert)
*pin 7: Black/Violet Driveaway Protection from OBC
pin 8: Gray Check Engine Light
*pin 9: Green/Blue Not Used (M5 Only Brown/Violet Oil Temperature Sensor to Gauge in Cluster)
*pin 10: Brown/Black Transmission Park/Neutral (Lets the ECU know when you're in Park/Neutral)
*pin 11: Brown/Yellow Ground For Temp Sender Gauge
pin 12: Brown/Violet Coolant Temp Sender Gauge
pin 13: Green/Violet Fuel Pump Relay
*pin 14: Black/White Vehicle Speed Signal
*pin 15: Black/Green Unloader Relay
*pin 16: White/Yellow RxD
*pin 17: White/Violet TxD
pin 18: Black/Yellow Starter Terminal 50
pin 19: White/Green Service Indicator to SI board
pin 20: Black Engine Speed (RPM)
pin 21: Green Ignition
pin 22: Green/White o2 sensor relay
pin 23: Brown/Green Oil Pressure Switch
pin 24: White/Black Present Rate Fuel Output
pin 25: Blue Alternator

That's everything you need and a few more things I tracked down. * indicate connections unnecessary in the e28.

[ppressle]

I know this is an old thread, but, I would like to thank Brad and all the others that have contributed to this really valuable thread.

I put a B35 in my 83 533 this weekend and it fired up on the first try. Really amazing given the changes involved.

One area that still seems a little sticky is the mounting of the new b35 airbox. It doesn't quite fit easily. Any details on what others have done with that?

Thanks,
Pete

[slammin_e28]

One area that still seems a little sticky is the mounting of the new b35 airbox. It doesn't quite fit easily. Any details on what others have done with that?

Yes please! I've been searching for a nice thread with that documented.

[cue37@aol.com]

I am getting ready to do the B35 upgrade swap. I have over 350K on my '87 is. My engine is old and tired. Prius' are passing me effortlessly. Anyway, are there any other affordable (simple) options for the exhaust manifold other than the stock B34 version? I can't afford to do anything custom. Maybe there is a thread that I have missed? Since I am going to do this very soon I don't want to restrict the B35 engine with the smaller B34 exhaust manifold, if possible. Thanks for all your help so far!

[ganesht]

Oil pan-from b35 (part number 11131708345), since both b34 (part number 11131278878) and b35 pans fit, no reason to change them, unless you want to use the b34 alternator and power steering pump with mounting bracket. If you do want to change the pan to the m30b34 pan, then you will need the b34 oil pump pickup (part number 11411286468) instead of the m30b35's pump (part number 11411317100)

AC, power steering, and alternator-You can use your m30b34 power steering pump (part number 32411133969), 90A alternator (part number 12311466087), and AC compressor if you use the m30b34 mounting brackets (part number 12311708343 and 64521284953), adjusters, crankshaft pulley (part number 11211258274), and power steering belt (part number ), alternator belt (part number 11221706788), and AC belt (part number 64521711056).
You can use the m30b35 power steering pump (part number 32411141058), 140A alternator (part number 12311735706), AC compressor, mounting brackets (part number 12311707194 and 64521284953), adjusters, crankshaft pulley (part number 11231716270), and power steering belt (part number 11231709636), alternator belt (part number 11231706668), AC belt (part number 64521722371) from the m30b35, but you will have to do something to the lines for the AC, everything else will work and bolt up however.

sorry im a bit lost, can you use the b35 oil pan with the b34 alt and ps pump as long as you use the b34 mounting bracket? or do you need to use the b34 oil pan to mount the b34 mounting bracket?

[Bimmerguy2002]

need to use all of one thing