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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 04-16-2013, 08:02 AM   #41
Jim Murphy
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Yes and all lights will come on. Don't you have a trans temp gauge.
Nope. Besides this one, what other gauges should I have?
I do have pressure (?) and A/F ratio.

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Old 04-16-2013, 10:09 AM   #42
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Quote:
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Nope. Besides this one, what other gauges should I have?
I do have pressure (?) and A/F ratio.

Jim
Jim,

I would recommend an trans temp gauge. I bet u was getting a tran tq overheating code...
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Old 04-17-2013, 03:30 PM   #43
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Just had it looked at by Jason at BIP - the code is about bad communication
between the main computer and ABS and TC. While he was checking this out
he found that the battery was starting to die - too low a voltage reading. I went and replaced it immediately. I will keep driving it to see what happens.

In the meantime, I am starting to burn/consume oil much too quickly . . . .


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Old 04-17-2013, 08:10 PM   #44
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Which oil? Tranny? Engine? or S/C?
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Old 04-18-2013, 09:52 AM   #45
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Which oil? Tranny? Engine? or S/C?
Engine . . . . .
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Old 04-18-2013, 02:06 PM   #46
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Jim I was having the same trouble once I started running my supercharger last semester. I was told by my mechanic that I'm just going to have that auto trans limp problem as long as im sending that much power through that transmission. But this point about tire differences is interesting. I run square tires and wheels though my rear is 40mm wider with spacers. Maybe I'll try losing the spacers to see if that does the trick?
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Old 04-18-2013, 02:36 PM   #47
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Jim I was having the same trouble once I started running my supercharger last semester. I was told by my mechanic that I'm just going to have that auto trans limp problem as long as im sending that much power through that transmission. But this point about tire differences is interesting. I run square tires and wheels though my rear is 40mm wider with spacers. Maybe I'll try losing the spacers to see if that does the trick?
Any Tranny Mods? Spacers wont affect the Tire Size Rotation.
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Old 04-18-2013, 02:59 PM   #48
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No tranny mods. just 10.5 psi. and to clarify it is an xi, which people have frowned upon using spacers with. any other reasons I would have this same tranny light issue?
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Old 04-18-2013, 03:08 PM   #49
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No tranny mods. just 10.5 psi. and to clarify it is an xi, which people have frowned upon using spacers with. any other reasons I would have this same tranny light issue?
No mods = Tranny overheating due to slippage. Once Tranny Slip so much it will throw a light.
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Old 04-19-2013, 03:15 AM   #50
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No mods = Tranny overheating due to slippage. Once Tranny Slip so much it will throw a light.
If he were to put in a ipt valve body, would that fix the problem?
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Old 04-19-2013, 01:48 PM   #51
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If he were to put in a ipt valve body, would that fix the problem?
First, bring the transmission oil temperature down with an external oil cooler - I have one but you will still need to completely upgrade your transmission with IPT ($5K+) like I did, the torque converter, valvebody and the transmission parts like the clutch disks. With a 4 wheel drive the transmission is taking a real beating especially if you are FI as well. On second thought, go to the biggest oil cooler that you can fit due to previous sentence - and a oil temperature gauge, too.

Jim
ps - who makes the best gauge and where do you buy it and install it?

Last edited by Jim Murphy; 04-19-2013 at 01:49 PM.
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Old 04-24-2013, 09:50 PM   #52
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ps - who makes the best gauge and where do you buy it and install it?
I'm a big fan of fully programable dashes that allow you to datalog.

Cheapest:Aim MXL

Best value: Motec CDL

I understand that you're talking about a couple of hundred $$, and I'm talking a couple of thousand $$...but once you step into the big HP game...you kind of need better tools than a gauge to troubleshoot issues with.

For the transmission, I would be interested in:

Input shaft speed
Output shaft speed
Internal oil temp
Oil return temp from cooler
Engine RPM
TPS
Shift-up signal
Shift-down signal

That's what I'd be logging to start with...

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Old 08-23-2013, 04:43 PM   #53
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It has been awhile since I last updated this thread. We went full circle and tried some 255/35's on the rear and, surprise!, the traction control trouble light no longer comes on or puts me into Semi Limp mode. Now I am running 255/35's all the way around on 8.5's with no TC trouble.
When that got fixed other areas started going bad:

1. Electric aux fan motor burned up and got replaced but it blew the connection to the DME causing IT to go bad = install used DME with good fan connection and re-program it.
2. Alternator burned up on me leaving me dead in the water, stranded in traffic = new alternator
3. Two belt tensioners are worn out (could not get boost above 5 lbs) and while replacing them, the P/S pump shaft is found to have excessive wear (floats in and out a lot) so it gets replaced as well with an upgraded pump requiring new hose connectors.
4. And finally spark plugs replaced.

All this and the odometer just hit 66K, BUT the car is running again like it should for the first time in a LONG while.

But my Visa is now maxed out from all these repairs, sigh . . . . .

Jim
Back to autoxing the Jeep and helping F600's in their money race series.

Last edited by Jim Murphy; 08-23-2013 at 04:44 PM.
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