https://www.r3vlimited.com/board/ en Wed, 13 May 2026 22:46:08 GMT vBulletin 60 https://www.r3vlimited.com/board/images/misc/R3V.jpg https://www.r3vlimited.com/board/ https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/exhaust/10160867-any-feedback-on-new-ss-cat-backs-from-china Sat, 09 May 2026 12:48:37 GMT
https://www.alibaba.com/product-deta...94cdd0be71b4c4]]> Exhaust TimK https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/exhaust/10160867-any-feedback-on-new-ss-cat-backs-from-china https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/m10/10160684-e30-m10-crank-pulley-removal-install Wed, 06 May 2026 14:58:14 GMT
The M10 found in 84-85 318i's are not like the M10's found in 2002's, Attempting to remove the crank pulley off the engine can be done with the starter method but if your engine is taken out of the car or you took out your distributor/wiring for a standalone ecu conversion then this method can't work. The Impact method is a solid method but you do need to be careful since the engine still can turn if the flywheel isn't held down by the clutch or a screwdriver. However the impact method can work for removal if you also jam a screwdriver into the flywheel teeth before you go ham on the 30mm Bolt. Installation still requires the usage of a torque wrench set to 120 to 150 pounds respectively, Finally you can lock the flywheel itself with a small tool but this will require removing the bowl reinforcement cover (Part Number: 11141277030) and then the inspection cover to lock down the flywheel with the tool. I originally thought about removing the transmission but that's only if you're also changing the flywheel/replacing the clutch.


So what's all of this for? Essentially I'm going to add information here with pictures once I get the pulley off for machining, If you got pictures and information on how you did it, Drop it here. (M20 folks, please add your own information here as well so it helps out others when they do the crank pulley on the M10 and M20) ]]> M10 BadDays https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/m10/10160684-e30-m10-crank-pulley-removal-install https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/m20/10160649-m20b25-turbo Tue, 05 May 2026 19:16:36 GMT ive been going at this for a while , need to know if anyone is still running a whodwho megasquirt ecu , ive wired both the launch control and boost controller as shown in the diagram now with my msq file the drop downs in both i dont know what one to select pe0 - i set on the boost controller and it works in the output test but looking around people say thats for launch control which will not work when i went to t/ engine off and tried to see if it enables .. ive looked through diff msq files on his google docs but i cant figure it out or how i go about adding an output if it is missing as i did not use his msq files to get the settings dialed in and running im going to tune the car but want to have everything correct before wasting my time and money
ive wired both the launch control and boost controller as shown in the diagram now with my msq file the drop downs in both i dont know what one to select

pe0 - i set on the boost controller and it works in the output test but looking around people say thats for launch control which will not work when i went to t/ engine off and tried to see if it enables .. ive looked through diff msq files on his google docs but i cant figure it out or how i go about adding an output if it is missing as i did not use his msq files to get the settings dialed in and running

im going to tune the car but want to have everything correct before wasting my time and money ]]> M20 Bmwb https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/m20/10160649-m20b25-turbo https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/alternative-tuning-w-a-r-megasquirt-etc/10160641-stock-m20b25-turbo-mega-squirt-map-help Tue, 05 May 2026 17:57:52 GMT
I'd like someone with someone with more experience than me (none..), to look over my tune if possible. I know there are some threads with similar topics but I'm having trouble using those to verify my maps.

This ecu was sold to me second hand, previous owner claimed that there's a startup tune for the m20 on it, this is what was on it when I first connected. I was planning on using DIY Auto Tune to work out kinks (is it actually any good?)

Okay lets get into specs:
Car: 1990 525i (yes its not an E30 don't kill me)
Engine: M20B25, sort of fresh head, ARP studs, 440cc injectors, OEM style head gasket, perhaps some blowby (leaking oil from intake)
Turbo:
Turbine Trim: 74.2
Turbine A/R: 0.63
Turbine Inducer: 64.8mm
Turbine Exducer: 55.8mm
Turbine exhaust outlet : 79mm
Turbine exhaust inlet: 44.7mm（length）/85.8mm（width）

Compressor Side:
Compressor Trim: 48.1
Compressor A/R: 0.5
Compressor Inducer: 52.7mm
Compressor Exducer: 76mm
Compressor outlet:78 mm
Compressor inlet:51.5 mm

Sorry that was a lot, don't know if its necessary but its here.

Target: For now I'm looking to go as high as possible while being reliable in the sense that it wont just blow my engine after two months, this car is a street car that I use daily for the most part. I was thinking 6-8psi.

Please let me know if there is anything obviously wrong, any general tips are welcome, post your map if it fits the specs closely enough. If you post your maps make sure to provide all the necessary information on the engine and setup.

If anything else is needed or wanted for a more informed response let me know and I'll add it up top.

Ignition Timing

VE

AFR table
​​​]]> Alternative Tuning / W.A.R / Megasquirt / etc RonanMurphy https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/alternative-tuning-w-a-r-megasquirt-etc/10160641-stock-m20b25-turbo-mega-squirt-map-help https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/m20/10160518-ignition-timing-question Sun, 03 May 2026 14:36:46 GMT So basically my idle timing is sitting withing 12-18 degrees. Does it sound reasonable for 2.9 M20 10:1 comp with ITBs and 284 cam?]]> M20 zaq123 https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/m20/10160518-ignition-timing-question https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/m20/10160172-1987-325es-crank-no-start Sun, 26 Apr 2026 18:14:42 GMT Hey guys I bought another guys project a few weeks ago and have been trying to figure out a crank no start problem. I think it’s related to a bad ground since I can’t find a ground near the right strut tower. The car will run on starter fluid if I jump the dme relay but won’t fire injectors. If anyone’s dealt with something similar, I would appreciate any suggestions. Also if someone could tell me where I should be grounding the dme, or where the right strut tower ground is supposed to go, I would appreciate it! Hey guys I bought another guys project a few weeks ago and have been trying to figure out a crank no start problem. I think it’s related to a bad ground since I can’t find a ground near the right strut tower. The car will run on starter fluid if I jump the dme relay but won’t fire injectors. If anyone’s dealt with something similar, I would appreciate any suggestions. Also if someone could tell me where I should be grounding the dme, or where the right strut tower ground is supposed to go, I would appreciate it! M20 Fryedchicken34 https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/m20/10160172-1987-325es-crank-no-start https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/m20/10160157-is-this-normal-for-new-engine-mounts Sun, 26 Apr 2026 07:00:20 GMT So I just got my M20 back in after a mild rebuild. It took a bit of wrestling but I got the mount bolts to go into the brackets. But now looking at it, I'm a bit worried that these mounts are really angled and something is wrong.

They are new mounts so hoping you all say that this is normal and they will just settle in after a bit ...😬]]> M20 eight-0-eight https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/m20/10160157-is-this-normal-for-new-engine-mounts https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/m20/10159990-standalone-and-m20-idle-control Thu, 23 Apr 2026 03:56:02 GMT I was given a suggestion to actually meet the target with the set screw = ICV fully closed and keep ICV for cold starts only. Any thermal expansion in ITBs and idle change should be taken care by idle error timing correction table... in theory. More stable idle?

How do you guys do it and what's your thoughts?]]> M20 zaq123 https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/m20/10159990-standalone-and-m20-idle-control https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/transmission-driveline/10159985-vibration-in-4th-at-hwy-speeds-ensure-proper-alignment-from-engine-to-transmission Thu, 23 Apr 2026 01:55:00 GMT Maybe Magpie https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/transmission-driveline/10159985-vibration-in-4th-at-hwy-speeds-ensure-proper-alignment-from-engine-to-transmission https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/alternative-tuning-w-a-r-megasquirt-etc/10159712-m10-gauge-cluster-help-aem-infinity-506 Sun, 19 Apr 2026 19:04:09 GMT
]]> Alternative Tuning / W.A.R / Megasquirt / etc BadDays https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/alternative-tuning-w-a-r-megasquirt-etc/10159712-m10-gauge-cluster-help-aem-infinity-506 https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/m20/10159614-cam-timing-help-needed-marks-built-goodson-performance-m20-head Fri, 17 Apr 2026 04:07:40 GMT
Dug up the original invoice on the head/cam work from the previous owner and here's what I'm working with:

- Marks Built M20 head
- Ported and polished with intake matching
- Swirl chambers on intake side only
- Angle milled 15 degrees (noted as adding ~2 degrees of advance to cam timing)
- Built by Reed at Goodson Performance
- .470 lift intake / .486 lift exhaust
- New guides, seats, and TRW valves

Given the angle milling already adding ~2 degrees of advance to cam timing, I'm wondering if running the cam a tooth advanced was actually more correct for this setup than stock spec.

Does anyone have a similar setup? What does your timing look like? And does anyone know the overlap timing on this cam? Trying to figure out if I need to dial it back in advanced to get my power back. Also wondering about getting an adjustable cam gear.

Appreciate any help.

]]> M20 ynwaE https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/m20/10159614-cam-timing-help-needed-marks-built-goodson-performance-m20-head