MyE28.com

Big Bronze Rim wrote:Engine sounds great on the dyno. The HG didn't last too long though at that level.

Thanks, the gasket was pretty dried up and brittle. Checked the head for straightness and it was out .007 in the center, it's within spec per the Chilton manual. I have this M90 head that is straight and recently decked to use.

Did a little porting in the combustion chamber by the valves. Is the camshaft any different on the Euro M90?






Just need to swap over the manifolds, here's the old head.
Lesson learned though, when pulling the head with the manifold be careful not to break the timing chain guide rail. Mine broke in three pieces and now have to pull the front timing cover off.

I did some work around the valves like that on the last head I had on my M20. Turns out the head was cracked and it was a complete waste of time. It does seem like there might be something to gain by unshrouding the chambers.

Dan, that sucks you weren't able to quantify the gains due to the cracked head. I think it would help also.

turbodan wrote:I did some work around the valves like that on the last head I had on my M20. Turns out the head was cracked and it was a complete waste of time. It does seem like there might be something to gain by unshrouding the chambers.

The combustion chambers needed some cleaning and figured what the hell, can't hurt right

Big Bronze Rim wrote:Dan, that sucks you weren't able to quantify the gains due to the cracked head. I think it would help also.

Car ran great for about fifteen minutes. I'll try it again on my next head.

I re-skimmed this thread from the start and didn't see what I was looking for (might be blind). You're running a B34 or 35(?) M30 that is stone stock correct? How does the M90 head compare to the 'prepped' version?

Canuck YYC wrote:I re-skimmed this thread from the start and didn't see what I was looking for (might be blind). You're running a B34 or 35(?) M30 that is stone stock correct? How does the M90 head compare to the 'prepped' version?

Bone stock B34. Honestly the M90 head looks the same as the B34 head.

^^^Shouldn't the m90 head have bigger valves no? or was the only difference in the blocks?

e30-m30_kid89 wrote:^^^Shouldn't the m90 head have bigger valves no? or was the only difference in the blocks?

Cam was different (a 264, same as the b35) and the blocks were completely different. Bore, Stroke, CR......

valves were the same though

Head is back on, used a stock headgasket with ARP's



The M90head was decked so went ahead and made my own adjustable cam gear. Just took a stock one knocked out the dowel pin and used a rat tail file to open up the holes. And added a few degrees.





Started it up with no coolant for a minute then re-torqued the head again. Should be driving it by the end of this week

Nice! I got most of my stuff ready....Just waiting on my megasquirt to arrive.

What size exhaust housing is on that HX40 and how early or late does it spool?

e30-m30_kid89 wrote:Nice! I got most of my stuff ready....Just waiting on my megasquirt to arrive.

What size exhaust housing is on that HX40 and how early or late does it spool?

It's a 17cm housing, spools around 3500.

Wow nice job on making that adjustable cam gear! Those are usually worth around $200!

Good & Tight wrote:Just took a stock one knocked out the dowel pin and used a rat tail file to open up the holes. And added a few degrees.

Bad idea! What keeps your ghetto sprocket from moving? BMW put a dowel pin in it for a reason. You also used a worn out part, see how the teeth are pointed. That sprocket gets loose and you will be pulling that head again to replace it.

Should have had Paul make you one.

Did you dial in the cam or just throw in some extra avance for good measure?

Duke wrote:

Good & Tight wrote:Just took a stock one knocked out the dowel pin and used a rat tail file to open up the holes. And added a few degrees.

Bad idea! What keeps your ghetto sprocket from moving? BMW put a dowel pin in it for a reason. You also used a worn out part, see how the teeth are pointed. That sprocket gets loose and you will be pulling that head again to replace it.

Should have had Paul make you one.

Did you dial in the cam or just throw in some extra avance for good measure?

I did the same thing to my M10 and reved it to 8000rpm all the time without any problems.
The whole motor is worn anyway if it pops I dont care it was free.

And yes I just threw in some extra advance by eye.

Good & Tight wrote: I did the same thing to my M10 and reved it to 8000rpm all the time without any problems.

The same spocket on the M30 has to turn 1/3 more cam and actuate four more rockers, valves and springs.

You may have gotton lucky with the M10...the M30 is a different animal.

Duke wrote:

Good & Tight wrote: I did the same thing to my M10 and reved it to 8000rpm all the time without any problems.

The same spocket on the M30 has to turn 1/3 more cam and actuate four more rockers, valves and springs.

You may have gotton lucky with the M10...the M30 is a different animal.

Valid point, I guess there's only one way to find out.

i did the same 'upgrade' on my last FI engine.
but did make up metal inserts that kept the whole thing in its place.took alittle time with a small file,but piece of mind is worth more.m

All back together, took it out last night beat on it pretty bad and nothing broke Downshifted to 3rd at 55mph and floored it, sent the car sideways Rerouted the wastegate line differently and it doesn't spike to 18psi now, just stays at 14psi. Car feels faster and sounds a lot crispier
Here it is all buttoned up.

How's the project going,

I was wondering what size inducer and exducer you have?
You said it was the 17 housing.

I've seen 55-60 inducers with 6-8 blades,
Exducers around 60-67

Some more vids, enjoy.

Enjoy guys, I know I did. Lots of tire spin with the drag radials.

Test run before we go out and play.
http://s3.photobucket.com/albums/y83/li ... =flyby.flv

Pissed off Acura on spray lost terribly, decided to do a fly by and losses again (badly) 70 to 155mph in the vid.
http://s3.photobucket.com/albums/y83/li ... t=vstl.flv

335i from a 20 roll, traction owns me but not for long.
http://s3.photobucket.com/albums/y83/li ... ownage.flv

Can't resist the Honda's
http://s3.photobucket.com/albums/y83/li ... uction.flv


Done for the night just giving a show.
http://s3.photobucket.com/albums/y83/li ... eaving.flv

Open road why not.
http://s3.photobucket.com/albums/y83/li ... ghway1.flv

Obviously he didn't see the other Honda get raped.
http://s3.photobucket.com/albums/y83/li ... rapage.flv

I swear there is a heavily modded SRT4 next to us from a 60 roll for about a second.
http://s3.photobucket.com/albums/y83/li ... lesrt4.flv

Love it!

Dude, your vids couldn't have come at a better time.good inspiration..Im still trying to work out some bugs with my MS but once thats all done i hope to be close to as fast as you are..

E30M30 turbo cars rock!

I had one small question for ya..what diff ratio are you running?

I have a line on a 2.79LSD but im sorta worried it will be a bit too tall..

e30-m30_kid89 wrote:Dude, your vids couldn't have come at a better time.good inspiration..Im still trying to work out some bugs with my MS but once thats all done i hope to be close to as fast as you are..

E30M30 turbo cars rock!

I had one small question for ya..what diff ratio are you running?

I have a line on a 2.79LSD but im sorta worried it will be a bit too tall..

3.73 lsd, I have small drag radials though 195/55/14. IMO the gear is perfect for what I use it for. Top speed is 155mph @7000rpm in 5th, assuming the calculator is right.

hot DAMN. Your fucking nuts and I love it.

Good & Tight wrote:

e30-m30_kid89 wrote:Dude, your vids couldn't have come at a better time.good inspiration..Im still trying to work out some bugs with my MS but once thats all done i hope to be close to as fast as you are..

E30M30 turbo cars rock!

I had one small question for ya..what diff ratio are you running?

I have a line on a 2.79LSD but im sorta worried it will be a bit too tall..

3.73 lsd, I have small drag radials though 195/55/14. IMO the gear is perfect for what I use it for. Top speed is 155mph @7000rpm in 5th, assuming the calculator is right.

I bet that has a very unique look. How far off is the speedo with those wee little tires?

Good & Tight wrote:Some more vids, enjoy.

GREAT STUFF!!!

If you look back at my posts, you will see many that are "kills" from when I was tearing stuff up in my M535i.

Glad to see that you are continuing the tradition and doing it with video.

Keep it up but STAY SAFE.

Good kills indeed. The open WG sounds so sick. The car looks ridiculously fast and makes me question getting rid of my 3.73 diff as it just accelerates so hard. I'm worried I'll be disapointed if drop to a 3.25.

Big Bronze Rim wrote: I'm worried I'll be disapointed if drop to a 3.25.

Go the 3.46 like me! I feel like there is no "best" gear ratio. Always a personal preference.

Had some fun last night. First two runs were with a civic hatch fully built with over 400rwhp. He eats up Z06's, he was a little confused on how a 318i walked by him. Third vid was with a drag Integra with over 600rwhp running E85 and drag radials so big the front bumper was off so they can fit.
These are fully built engines that rev over 9000rpm against my stock 12 valve M30 on 15psi. Enjoy:)

Now I now the built engine has to rev to 8000rpm. These M30's are such a beast on boost.

First vid he got the jump, no biggie.:cool

http://s3.photobucket.com/albums/y83/li ... hatch1.flv

Second run with civic and left at the same time.:cool
http://s3.photobucket.com/albums/y83/li ... hatch2.flv

Teg run was the best out off all.
My ignition crapped out and the engine died during the run, but he was out in front when this happened.
http://s3.photobucket.com/albums/y83/li ... ntegra.flv