Red Rocket - 1990 325i Turbo

[JCarp90]

Thanks!




Update 3/10:

This past weekend I did a diff swap. Found a buyer for my S3.73, so I picked up an S2.93.

Car up:


Out with the old:


New 2.93 - It was covered in de-greaser because I felt the sudden urge to clean it. Once I started cleaning it, that motivation went away so it went in the car like this lol. But first, some redline fluid.



Up-skirt shot:


Install took longer than it should have because I was having trouble getting just 1 of the top bolts to line up properly. Ended up actually taking all 4 bolts back out, then slowly, 1 turn at a time tightening each of them individually until I could ratchet them in place. I've never had that much trouble before.

After finishing that, I took her for a spin. I thought the 2.93 might be a little too long for an M20, but it was actually great. I can tell that 2nd and 3rd gear rolls in this thing are going to be fucking killer. Unfortunately with all of that being said, the diff is super noisy. No clunking or anything like that, but the sound coming from my back end is almost like my rear brake pads are shot and they're grinding constantly while driving. I called the guy I bought the diff from and he has another I can swap out, but he's never run it so again I will be going into another diff swap blindly. So I've got that going for me.

In other news, I need to upgrade injectors. Around 4600rpm, the car cuts out every time. My logs are telling us that my injectors are at 91% duty cycle at 4,000 RPM. This week HOPEFULLY I will be ordering a set of Siemens Deka 60#ers and finally ARP studs. I've got a Hallman Pro RX boost controller sitting in my toolbox waiting as well. I was really hoping to run the car for a while as is, especially since I just bought the bike, but I guess I should have expected that with only 30#ers in there now. But on the other hand, this now means turning up the boost to 15psi or so.

Overall, sort of a bum update, but I'm very happy with how the car is running. AFRs are great (11.3-11.8). Plus, Kameron sent me a virtual dyno plot which really instills some hope in me. 227hp/283lb-ft. That's about 7hp less, and 50lb-ft torque more than my S52 car. Seeing this and feeling it pull so well actually gives me a lot more motivation and makes me very excited for warmer weather. This week should be in the 60s so hopefully I'll get out and make some videos.



Also my shift knob broke. What the shit.

[efficient]

your car is bad ass. id like to turbo but idk where to start lol.

[JCarp90]

It is. Naturally the last couple of weeks when it wasn't running, it was like 55 degrees out. Now it's 12 degrees

[dillon7]

that looks like fun

[TheTacoMan]

Aboot time, glad to see it running.

[JCarp90]

i just finished my exhaust it ran amazing on the road than ye , i forgot to take out the bad 87 octane gas .... and replace my fuel pump for a wlabro im shooting fireballs for days hit boost sick for the first 2 seconds. but not he tune ran perfect it gave me some errors but started to work out

btw what does your AFRS read at idle

The tune ended up just needing some adjusting which Whodwho did for me. Either way, Kameron and Keith are both awesome to deal with. I've asked each of them a million questions and they've never let me down. AFRs are in the 10s but it's also like 20 degrees out right now.

Anywho, car runs now. WOOT. Started snowing literally right as I opened the garage to test start it, so here's a lame parking lot snow video.

[Bmwb]

i just finished my exhaust it ran amazing on the road than ye , i forgot to take out the bad 87 octane gas .... and replace my fuel pump for a wlabro im shooting fireballs for days hit boost sick for the first 2 seconds. but not he tune ran perfect it gave me some errors but started to work out

btw what does your AFRS read at idle

[JCarp90]

im currently useing kams tune it gave me those errors and was told they wouldnt matter so i went with it , finally got my wasted spark all set up thanks to whodwho great guy very helpful kam also helped alot , my issue tho was it wouldnt start and not all coils seemd like they were firing so i used 1 spark plug wire and a old spark plug and tested each coil plug 1 by one each had spark , than i noticed my brand new MSD wires were not working proabbly my fault didnt put them together properly anyways got a full set of Taylor pro plugs already made very long but my car fired right up with no issues!!

I think Whodwho finally led me to the problem. The car fired last night, but ran like shit. I've got the plug wires on the coil mixed up to where they don't match the input wires from MS. I'll get that fixed tonight and I'm certain the car will run.

I have this super cool ability to make this exponentially more complicated in my head than they actually are. Thus confusing myself and fucking shit up.

[Bmwb]

im currently useing kams tune it gave me those errors and was told they wouldnt matter so i went with it , finally got my wasted spark all set up thanks to whodwho great guy very helpful kam also helped alot , my issue tho was it wouldnt start and not all coils seemd like they were firing so i used 1 spark plug wire and a old spark plug and tested each coil plug 1 by one each had spark , than i noticed my brand new MSD wires were not working proabbly my fault didnt put them together properly anyways got a full set of Taylor pro plugs already made very long but my car fired right up with no issues!!

[JCarp90]

Does anyone have an insight into these error messages? Happens when I burn the tune. Kameron says the tune has worked great on 5 other cars without any errors.

[JCarp90]

ah Ive always wanted a drz supermotard. they look like so much fun

They're pretty amazing. This is my first, though I've known for a long time I wanted one.

THat sucks about all the problems with everything... Ride the bike often! Great stress relievers those things are!

Yeah - I'll get it figured out eventually. Maybe my expectations are just set too high. I need to work my patience level.

I plan to put as many miles on the thing this summer as I can. Bought it Saturday and by Tuesday I had already put 300 miles on it when the average temperature was in the 40s lol.

[DER E30]

THat sucks about all the problems with everything... Ride the bike often! Great stress relievers those things are!

[Peattie]

ah Ive always wanted a drz supermotard. they look like so much fun

[JCarp90]

Progress has been slow, but it's because I've been distracted by the new toy.



BUT last night I finally put in some garage time. I bought a new soldering iron so I could make the connector harness deal for wasted spark. Ended up looking pretty good to me at least.





After I did that, I spent about an hour piecing together my MSD plug wires. Left them full length and can modify later if necessary, but this works for now. Mounted the coil with some handy dandy zipties. Looks like this:



Next, I mounted the MS, re-ran the vacuum line going to it, plugged everything in, installed new battery and got Kameron to send over the new tune aaaaaaaaand then all went south. For whatever reason, TunerStudio threw a bunch of errors burning the tune. Said something to the effect of invalid parameters or something. Obviously it's not the tune because it works for Kameron's cars he's tuned, so it's something on my side. Anyway, tried cranking the car and it just cranks and cranks and cranks, but won't start. I was so frustrated I gave up. Tonight I'll investigate to see if I even have spark.

Once it fires, I need to re-wire the tach. Does anyone know if I can pull tach signal from the wire leading to the DME?

[JCarp90]

tell me how the coil setup works with you i got the exact setup you purchased there but can seem to get it to run atm with megasquirt! solid car looks and sounds great

I'll be sure to let you know what I find. Thanks!

Looked at the video again, you should get a better looking muffler thing haha.

I thought about it, but it sounds so good I'm just not messing with it. To hell with my neighbors. :D