Miata Turbo Forum - Boost cars, acquire cats.

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-   -   Tuning Fuel Economy (https://www.miataturbo.net/megasquirt-18/tuning-fuel-economy-27138/)

elesjuan 10-15-2008 04:35 PM

I'm not sure why they're so high either. I used DIYs base map, untouched DIY Spark map, stock 1.8 injectors, required fuel 11.3 per the megatune calculator, rebuilt head, stock intake manifold, stock exhaust manifold, monsterflow intake, no AFM, stock intermediate pipe, empty FM high flow cat, 3" Enthuza TurboRacer catback. I haven't dynoed yet, but it seems to be a noticeable difference in power between a stock 1.8 and my car. In a race between my friends supercharged 1.8 and mine I was like 3 car lengths behind him at the top of third gear and his car runs low 14s with shit launches.

I didn't remove the boost cells in hopes that soon I'll have my turbo installed, but thats still a ways out unfortunately. That stupid A/C Drier is in the way and my solution to move it has failed due to difference in fittings and connection styles of the drier. I'm about to evac the system, remove the drier and cap the lines then worry about moving/hooking it back up come spring time.

For Idle I can't seem to get a solid ~900rpm smooth idle at anything less than 12.5 - 13:1, if I lean it out to 14 or 15 it 'bumps' and misfires a lot. Also as of late I haven't seen it really IDLE at anything below 1100rpm or so.

Saml01 10-15-2008 05:15 PM

Well thats pretty cool, I didnt know MLV had a AFR Table. I have been using the one in my MSQ and my fuel economy and cruise is balls on accurate. Granted I run richer than Paul in cruise and off boost. I don't have anything over 15.5. In cruise. Average 22mpg.

Ajb 10-15-2008 06:43 PM

This may be a bit stupid question but , my car is completely stock and with my LC1 hooked up i cruise at 15.5 and can easily average 30 mpg.
Should sam not be getting the same as me as you are not in boost when you cruise? or is it all the in boost situations which bring the average right down?

Braineack 10-15-2008 06:54 PM


Originally Posted by elesjuan (Post 320129)
For Idle I can't seem to get a solid ~900rpm smooth idle at anything less than 12.5 - 13:1, if I lean it out to 14 or 15 it 'bumps' and misfires a lot. Also as of late I haven't seen it really IDLE at anything below 1100rpm or so.


correct map sensor selected? baro setup right?

johndoe 10-15-2008 07:38 PM


Originally Posted by Ajb (Post 320178)
This may be a bit stupid question but , my car is completely stock and with my LC1 hooked up i cruise at 15.5 and can easily average 30 mpg.
Should sam not be getting the same as me as you are not in boost when you cruise? or is it all the in boost situations which bring the average right down?

If he drove entirely on the highway and never got into boost and his cruise AFRs were 15.5:1 then yes it would be the same. His total average though is factoring in boost where his AFRs might be anywhere from 12.5:1 to 11.5:1 and believe me it is hard not to get into boost as often as you can.

paul 10-15-2008 08:04 PM


Originally Posted by ArtieParty (Post 320078)
I remember tuning with Paul one day and his numbers were really high too. Turned out that the line came off the FPR, if I'm not mistaken.


ssshh, i never have problems with my cars.

johndoe 10-15-2008 08:08 PM

me neither...

elesjuan 10-15-2008 08:50 PM


Originally Posted by Braineack (Post 320180)
correct map sensor selected? baro setup right?

For a couple weeks I had the wrong map sensor selected, but thats been corrected. I have baro correction disabled, should I enable it? I didn't think I could use that without a second map sensor?


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