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Old 08-10-2010, 07:20 PM   #1
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Default 1200rpm cutt off

Well I got my car idling around 850rpms nicely.

Problem is trying to tune the VE fuel table any time I get close to 1200 my tach dips quickly, it won't let me go above it, happens slowly or if I try to push the pedal in quickly, what I've heard so far is its because of the VE table. I'm wondering if anyone seen anything like that before that it maybe wiring, signal problems?

I'l upload the log of the drop off in a minute with the msq

Any thoughts thanks
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Old 08-10-2010, 08:01 PM   #2
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logs and msq tune

If you see any weird settings let me know.

AEM wideband linear
Attached Files
File Type: msq current.msq (32.8 KB, 88 views)
File Type: msl 1200cut_off.msl (171.0 KB, 200 views)
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Old 08-10-2010, 08:25 PM   #3
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This is a weird one. I'm having a dickens of a time figuring out the log without a TPS reading. Can't tell what's causing what...

AFRs look reasonable. Spark angle isn't doing anything weird.

CLT reading is really strange. Was the engine actually running at 230-250F? IAT looks damn high, too. 150 according to the log.

Methinks someone hasn't calibrated their sensors.

I'd suggest you disable Coolant-Corrected Air Density. See if that does anything useful.
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Old 08-10-2010, 08:51 PM   #4
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I was tuning while the engine was at running temp, idling, fan was on and temp guage on my dash was at running temp like normal,
hmmm

I have the maf still in using the maf for the stock IAT sensor, and the exhaust manifold cover is not on it currently, maybe I should put it back on to lower the air temps going into the intake, I have that first part of the intake remove the curls upwards to the fender area.

is the small jumps in clt and iat because of wiring possibily?

Should I use shielded wire instead?

Also I disabled mapdot by throwing 2540 into the threshold so I could tune the tables, atleast thats what I got from the ms extras manual for tuning

I downloaded the hires 10g code and used easytherm to put both sensor as rx7 coolant \ rx7 iat with a bias of "Standalone: Bias will be 2490 for each"

hmm maybe I have the wrong bias for the stock IAT sensor

Last edited by Techsalvager; 08-10-2010 at 09:11 PM.
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Old 08-11-2010, 06:45 PM   #5
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yo 1.6l guys using MS with stock parts still whats your max reading you get on AIT and CLT sensors, stock miata sensors.
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Old 08-11-2010, 07:18 PM   #6
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215F is the max reading in MS-1.

did you copy the .inc files into the correct TS or MT folder?
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Old 08-11-2010, 07:46 PM   #7
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Quote:
Originally Posted by Braineack View Post
215F is the max reading in MS-1.

did you copy the .inc files into the correct TS or MT folder?
braineack is 2490 bias for both rx7 iat and clt sensor on a standalone setup the correct bias?
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Old 08-13-2010, 08:31 PM   #8
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I'm back and I think I may have an better idea, I think its somehow related to coolant\air correction.

I reflashed with MSPNP 90-93 with afm to get the correct sensor data into my MS

Problem is I noticed in the coolant air correction screen that its reading IAT at the top right
220F+.

I did see peak of 155f in tuner studio for the IAT guage, I'm gonna throw the intake pipe that goes the fender and the exhaust header cover back on and see what happens

if its still doing same thing, I'm gonna buy a GM IAT mount it on one of the plastic pipes near the tb and test.
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Old 08-20-2010, 10:10 AM   #9
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After getting together with some friends, I believe to found what maybe causing the problem.

Spark

When reving up the rpms on the car dash drop alot more then compared to tuner studio rpms, also if you wot the car the rpm drop to 0 and with the timing gun hooked up, spark is erratic

Also the iginitor gets super hot.
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Old 08-20-2010, 01:09 PM   #10
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Whats yall dwell settings for stock 1.6 setup, 5ms running? anyone running less?
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Old 08-21-2010, 03:45 PM   #11
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Is the miata's ignitor a smart dwell unit?
If yes why do we use dwell control instead of fixed dwell?
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Old 08-21-2010, 11:42 PM   #12
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Quote:
Originally Posted by Techsalvager View Post
Is the miata's ignitor a smart dwell unit?
Nope.
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Old 08-22-2010, 09:56 AM   #13
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Quote:
Originally Posted by Techsalvager View Post
Also the iginitor gets super hot.
Sounds like you have your spark output set backwards. The ignitor is likely damaged.
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Old 08-22-2010, 10:10 AM   #14
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Quote:
Originally Posted by Ben View Post
Sounds like you have your spark output set backwards. The ignitor is likely damaged.
Still works fine with the stock ECU, Thats how I can still get around in my car.
Revs up fine.


What do you mean by spark output backwards? A and B spark outputs switched around?
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Old 08-22-2010, 10:44 AM   #15
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Basic setup -> Ignition options -> Spark output. Change that and try again to see if the ignitor still gets hot.

Dimitris
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Old 08-22-2010, 11:57 AM   #16
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no such menu choice, this is MS1
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Old 08-22-2010, 12:11 PM   #17
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spark > spark settings
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Old 08-22-2010, 12:23 PM   #18
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you guys refering to spark output inverted yes\no?

Currently its on Yes because I just did Joes spark mod and still the same 2500~rpm drop out.

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Old 08-22-2010, 12:38 PM   #19
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could it simply be your fuel map going 30% leaner at 2500RPM from the 1800RPM column?
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Old 08-22-2010, 12:39 PM   #20
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Heres a log of the newest trial run with joes spark mod and ve tuned up near 2500 to make sure it wasn't fuel ve table causing it.

tune included

wideband = aem linear

wondering about the near 5ms idle PW.
Attached Files
File Type: msq besttunesofar2.msq (34.1 KB, 69 views)
File Type: msl newidlechanges.msl (132.6 KB, 76 views)
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