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08-16-2014, 12:54 PM | #1 |
Second Lieutenant
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2000-2700rpm surge
Alrighty.. so after the mods I started to notice this surge.. Its not EXTREME but it happens at part throttle from 2k to 2700rpm with a little bit of load. Quite annoying..
Now, I sent a couple logs off to Jon and Terry to see what else is up. Sounds like the car is pulling timing. I've got 50/50 mix in the meth tank.. running either 92 Octane with a booster or 94. I double checked all the wiring connections. Watching the hijacked gauges I get 100% meth flow and in 3-4th gear it shows 16-17psi.. Anyone have any thoughts? Mods are as follows VRSF stepped core intercooler, AR charge pipe, JB4 ISO, BMS meth kit. BMS catless downpipe RPI quad exhaust and a K&N drop in filter. Went to the track last night and went a best of 13.3@108mph with a marginal 2.1 60ft time. Certainly a bit more practice and I could get a 1.9… but still! That just doesn't look right based on weight and trap speed. |
08-16-2014, 01:43 PM | #2 |
Major
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"Surge" is a pretty specific diagnosis, and I doubt that is your issue. It's a word people like to toss around, but is almost never the issue.
You probably just have knock and the ECU is reacting by pulling timing and/or load (boost), so you feel hesitation. Start by replacing all your spark plugs, then you can try chasing down coils or injectors, or carbon cleaning.
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2009 BMW 135i 6MT Sport, AFE intake, Cobb AP, Apex 18x8.5+9.5, 255/275 PSS
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08-17-2014, 01:52 AM | #3 |
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Its not a hesitation. Its an oscillation when steady throttle at low openings. Sure surge sounds specific.. but that was the easiest descriptor.
I highly doubt it's cylinders that are carboned up. What with the water meth and the BMS catch can from new. You're right though. I will check the plugs and I know from the logs that it's pulling timing at WOT. Makes me wonder if it's got a bad coil… |
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08-19-2014, 08:38 AM | #4 |
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I know your problem, my car has done it since I installed JB4. ISO 5_3 seemed to help a bit at first but it's still very annoying. If I run it stock boost map 4 it no longer does it... So i've just lived with it.
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13 X1 35iX, 98 Z3 2.8, 01 M Coupe, 96 Z3 1.9 DASC, 95 318ti, 13 smart fortwo
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08-19-2014, 09:00 AM | #5 |
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Is your car really jumpy or snappy with the throttle? My car was doing the same thing and turns out my menu 10 and 12 settings were messed up so I reset all setting to default and now it's good
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2008 Aw/Coral Red Manual 135i Coupe-
JB4 G5 + BMS race flash, BMS meth kit, VRSF DP, Big tom Ic, BMS chinese tester CP, Custom Muffler Delete, BMS Oil Cooler Valve, Cowl Filters, Clutch Stop, B&M Short Shifter, Spec Stg 2+ Clutch W/ Oem dmfw, Vmr V710, KW v2, M RSFB, 1M Front and rear Bumper, Performance Side Skirts, slek trunk, Lci blacklines.] |
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08-19-2014, 02:17 PM | #6 |
Second Lieutenant
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I haven't tried map4.. but 1,2,3 and 5 do it.
It happens at steady throttle with a light load between 2000 and 2700rpm. It literally sounds like an oscillation. Its not jumpy or snappy with the throttle.. |
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08-21-2014, 10:36 PM | #7 |
Second Lieutenant
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Changed the DWM to 20 and sure enough its gone. Now to slowly bump it back up so it's not super laggy!
Also.. changing the plugs.. the two I pulled look haggard |
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08-21-2014, 11:41 PM | #8 | |
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Quote:
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2008 Aw/Coral Red Manual 135i Coupe-
JB4 G5 + BMS race flash, BMS meth kit, VRSF DP, Big tom Ic, BMS chinese tester CP, Custom Muffler Delete, BMS Oil Cooler Valve, Cowl Filters, Clutch Stop, B&M Short Shifter, Spec Stg 2+ Clutch W/ Oem dmfw, Vmr V710, KW v2, M RSFB, 1M Front and rear Bumper, Performance Side Skirts, slek trunk, Lci blacklines.] |
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