1987 325e sedan M30B35 swap

[e30m3s54turbo]

I like how your build is going.

[st.petebiodiesel]

I've been waiting patiently for these. 94mm bore, 10:1 compression ratio, the increase in bore will bring the displacement from 4340cc to 3581cc. Should pick up at least 15hp from the increase in displacement and the higher compression ratio. After new years I'll send the block, pistons, and crank to get bored and balanced. Can't wait to put this engine together. Sent from my SM-G960U using Tapatalk

[st.petebiodiesel]

did the key break on the harmonic balancer?

Yes. I've had my key way break on my harmonic balancer several times. I even tack welded my crank nut, still came loose. When I build my new engine I will have the entire rotating assembly professionally balanced at the machine shop. Sent from my SM-G960U using Tapatalk

[LowR3V'in]

did the key break on the harmonic balancer?

[gnmzl]

Damn, that's something I didn't expect too! Happy you enjoy it though, rebuild and race again!

[st.petebiodiesel]

Went to the local 1/4 mile this weekend. My goal was to run a low 12 second pass. First run I couldn't grab any gear easily but still managed a 13.8 @ 101mph. Immediately after this run the car was obviously hurt. It still ran and drove, but it was making a hell of a racket. Turns out I broke my crankshaft. How could this happen with only 400 whp? I expected to melt a piston or bend a rod with nitrous. Breaking a crank just seems unreal. I'm going to rebuild the engine, just might take awhile. Crazy thing is that the car still ran and drove with the broken crank. Sent from my SM-G960U using Tapatalk

[varg]

Quick! Might want to put a second diff mount on that thing before those launches and shifts start to rip the stock mount out of the floorpan.

[LowR3V'in]

bad ass. i think what come next is turbo.
filling tanks every week becomes $$$$$$$.

[wworm]

awesome update. Glad to see something different. Get this puppy boosted!

[st.petebiodiesel]

Kinda committed to the drag car build. I've been watching a lot of Hot Rod Drag Week coverage on YouTube. Got a set of Hoosier DR2 drag radials. Which are actually closer to a straight up slick. 225/50-16. Look at all that meat. Also changed my diff bushing to help with those hard launches. I made a couple passes at the test and tune at the local 1/8th mile. I struggled with the launches. I would leave and the car would bog. 8.5 was the best I could do in 3 passes. Then I put in a fresh nitrous bottle and went for 1 more pass. I decided to leave the nitrous on for the entire pass. Normally I would turn it on after I shifted to second or halfway through 1st. That and I gave it a lot more RPMs to prevent the big. The results were impressive. That pass works out to a 12.6 second 1/4 mile. Time for more nitrous! I'm gonna spray this turd to 11 seconds. Sent from my SM-G960U using Tapatalk

[AWDBOB]

Casual Nos drop in. I love how much you enjoy this car! I envy, very much.

[LowR3V'in]

Why not an aftermarket clutch?
aftermarket pp has multiple straps and modded to be stronger than an m5 one.

the stock m30 ones are pretty decent though i pushed one to 10psi before it started to let go
maybe alittle over 300tq.

[st.petebiodiesel]

Replaced my clutch with e24 M6 clutch. It wasn't cheap.


Flywheel still looks in excellent shape.

I've been watching a lot of drag racing YouTube videos and got pretty interested in nitrous setups. Kinda playing around with the idea of making my sedan a drag car. I know the e30 is supposed to be a twisty road/track car, but I live in Florida where we only have on/off ramps and straight roads.
So I pieced together a nitrous system.

My microsquirt has a dedicated nitrous controller built in. I run the nitrous all dry and the microsquirt adds additional fuel and retards timing to whatever values I input. Obviously the injectors will be the limiting factor to how much nitrous I can run.
Dry nozzle before the throttle body.



With this nozzle and solenoid I can only run a 175hp jet, which should be plenty.
Here are some pics of the routing of the nitrous.





1 step colder plugs after a few 75whp jet runs.
Here are my microsquirt settings for the nitrous.

I'm currently running a 125hp shot right now. IT'S INSANE!!! 125hp is about all I can run on the stock injectors. Definitely feels like a 300whp e30 sleeper.
The 195 tires on the bottle caps are pretty much useless now.

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[Streichholzschächtelchen]

Excellent build, lots of "why didn't I think of that" stuff going on. Can't wait for another video!

[st.petebiodiesel]

I ended up cutting out my moroso muffler.

It looked pretty restrictive.

I just replaced it with a 2.5" straight pipe.

It made the car only slightly louder. It sounded a lot healthier too. I'm only running an auto parts store magna flow muffler in the back.

Now to take it back to the track, which ended very fast.
I was in the middle of doing my first burnout and all the sudden something came loose and shook the ever living shit out of the car. I shut the car off immediately and pushed it back to the pits. I'm not sure what had happened at the time, the car still ran but if I gave it any revs the car shook violently. Maybe something in the clutch cam loose?
I ended up towing the car home later that night.
I removed the transmission the following night to find this.

Clearly I had broken some pressure plate straps.



Never seen straps tear like this before. I've seen them bend, but not tear out completely. This was a stock e28 535i clutch and pressure plate.
I'm going to replace it with a e24 m6 clutch.


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