Some analysis please - MK1 1.6 Turbo - Miata Turbo Forum - Boost cars, acquire cats.

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Old 06-30-2014, 07:53 PM   #1
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Default Some analysis please - MK1 1.6 Turbo

Car is a 1991 MK1 1.6 MX5/Miata with:
- T28 turbo conversion
- MSPNP gen1
- 550cc injectors
- Innovate LC-1 wideband
- Magnecor 8.5mm HT leads
- NGK BKR7EIX Iridium spark plugs

I just swapped in a replacement engine and it seems to be running very rich, the smell alone would give it away.

Attached is the datalog and the MSQ that is on the Megaquirt at the minute, this was tuned professionally and not by me.

Can anyone please have a look at what's going on as I'm very much a beginner when it comes to engine management.
Attached Files
File Type: msl 2014-06-30_22.41.00.msl (985.1 KB, 24 views)
File Type: msq CurrentTune MX5 Turbo.msq (36.6 KB, 31 views)
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Old 06-30-2014, 09:56 PM   #2
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You don't have an air temp sensor hooked up to the ECU, and it's fueling for -40 MAT. Fix your air temp sensor and change your oil.
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Old 07-01-2014, 05:08 AM   #3
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Quote:
Originally Posted by Ben View Post
You don't have an air temp sensor hooked up to the ECU, and it's fueling for -40 MAT. Fix your air temp sensor and change your oil.
The sensor is plugged in but the wires got cut and I think I reconnected them the wrong way around, if that's what the problem is I'll be a happy bunny!

What would changing my oil achieve?
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Old 07-01-2014, 10:34 AM   #4
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The air temp sensor has no polarity.

Changing your oil would achieve not wearing your bearings by lubricating them with gas saturated oil.
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Old 07-01-2014, 06:58 PM   #5
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The wires for the IAT were pulled out of the existing loom, fixed now and taking a reading. Still no improvement.

Would a free air calibration of the O2 sensor be of any use or are there any other figures that look out of place on my log?

What are people's opinions on my VE tables on the MSQ file?

Last edited by JasonNA; 07-01-2014 at 07:30 PM.
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Old 07-01-2014, 09:08 PM   #6
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The bad air temp reading was creating 150% fuel correction. You will need to provide a new datalog now that the air temp sensor was working.
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