Odd sputtering issue at certain RPM
08-27-2018, 10:35 AM
#1
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Location: Niagara Falls NY/ Ontario, CA
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Odd cut out/stuttering issue at specific RPM
car: 1993 chassis with MSM engine (8.6 pistons) and no turbo installed yet. AEM EMS V1, NB cam/crank w/ 12+1 wheel, AEM MAP, GM IAT, NB1 mani (VICS wired in), NB TPS w/ VTPS, stock injectors w/ m-tuned dual feed rail, DW300 and fuellab fpr.
I tried to get a base map on my car at some local tuners. Spent a few grand and each time I got back a car that didn't run so I've been doing this on my own. Grabbed another ecu off someone here with a similar set up and managed to get the car running fairly well.
Only issue is that around 5k rpm the car sputters/box and stops. According to the wide band its not going too lean. Plus gap is stock, Tried other coils/wires/cam/crank sensor, re-gapping the crank sensor and the timing map seems comparable to another miata we have with a VVT swap.
Car pulls great up until then but it just feels like its hitting a rev limiter. Any ideas would be apreciated
I tried to get a base map on my car at some local tuners. Spent a few grand and each time I got back a car that didn't run so I've been doing this on my own. Grabbed another ecu off someone here with a similar set up and managed to get the car running fairly well.
Only issue is that around 5k rpm the car sputters/box and stops. According to the wide band its not going too lean. Plus gap is stock, Tried other coils/wires/cam/crank sensor, re-gapping the crank sensor and the timing map seems comparable to another miata we have with a VVT swap.
Car pulls great up until then but it just feels like its hitting a rev limiter. Any ideas would be apreciated
Last edited by Neilv; 09-06-2018 at 08:05 AM.
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09-04-2018, 11:47 AM
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Pulled some timing and added a little fuel at the top end. Weirdly now it does the same thing at 4K rpm. If I lightly accelerate I can get past 4K and from 5-7 its just fine. What the....
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