MPG- give me some input please - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 05-24-2014, 05:32 PM   #21
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tak tak tak tak.... only 3rd gear....
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Old 05-24-2014, 06:47 PM   #22
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What wideband are you using? When I had an LC1 it would sometimes go out of calibration and read leaner than the mixture really was. It would cause the ecu to dump more fuel in and result in shitty mileage.
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Old 05-24-2014, 07:44 PM   #23
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I use Spartan WB from 14point7.
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Old 05-24-2014, 07:50 PM   #24
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oh wow....I have a theory about your issues now
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Old 05-24-2014, 08:26 PM   #25
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I get 20-22mpg with a 5 speed/4.3 diff and when it gets driven, it gets driven hard.
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Old 05-25-2014, 03:56 AM   #26
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I use 5 speed with NB dif - I think it's 4.1, how can I make sure ?

My speedometer shows around 10kph less the gps speed, with the original dif it was 10kph more then gps speed.
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Old 11-22-2014, 03:16 PM   #27
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I'm trying the best I can to get a better MPG, I don't see much improvement, even with low boost (>10psi) and 16:1 AFR cruise.

17.5MPG would be an achievement.

I noticed that my normal cruise is 60-70kpa that is a bit high, if I under stand correctly.

Anything I can try more or that is it with the current turbo combo ?

My current AFR:

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Old 11-22-2014, 03:35 PM   #28
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That's a very high kpa for cruise. There is something wrong.
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Old 11-22-2014, 05:34 PM   #29
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I know you'd think leaning it out like that would better your fuel consumption, but perhaps you should post your spark/ all of you enrichments. I get 29mpg and no less than 24 when I am mad at life and take it out on my car for a week.
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Old 11-22-2014, 06:53 PM   #30
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Quote:
Originally Posted by elior77 View Post
My ignition map:



Thank you for your help.
Log:
https://www.miataturbo.net/attachmen...4_18.25.32.rar

You can see that my cruise 2700-3200rpm is above 60kpa
Attached Files
File Type: msq CurrentTune.msq (111.0 KB, 33 views)
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Old 11-22-2014, 10:14 PM   #31
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You can typically run 30 degrees up to 100kpa. Your high boost high rpm cells have too much timing. You don't need more than 14 on the top row.
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Old 11-24-2014, 03:46 PM   #32
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After reading around about Volovs S70 (my turbo donor) mileage I think 18mpg is a normal number...

What is it's what it is...


Bigger turbo ?...
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Old 11-24-2014, 04:15 PM   #33
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That's not really how that all works.
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Old 11-25-2014, 12:28 PM   #34
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Will it not give any idea of mileage ?
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Old 11-25-2014, 12:36 PM   #35
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You're wondering if the gas mileage a Volvo S70 gets has anything to do with your Miata?
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Old 11-25-2014, 12:49 PM   #36
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I use its turbo
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Old 11-25-2014, 02:06 PM   #37
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I use a radiator hose from an Escalade. Does that mean my cooling system could cool a 6.2L?
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Old 11-25-2014, 02:17 PM   #38
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Uh, but you don't use it's manifold, down pipe, engine, injectors, intake, exhaust, engine design, head design, ecu, weight, or ANYTHING else related to the Volvo.

You have a LOT to learn if you think you can compare the car you've taken your turbo from to your Miata for mileage comparisons.
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Old 11-25-2014, 02:29 PM   #39
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Quote:
Originally Posted by elior77 View Post
I use its turbo
Just using the turbo won't give you similar mileage as the Volvo. Your fuel table and spark table need to be tuned properly and you will get decent gas mileage. On my 94 on the interstate I could hit 32mpg if I stayed out of boost.
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Old 11-26-2014, 03:09 AM   #40
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When you go out shopping for a turbo one of the turbo specs are "supported" HP.

If I understand right: HP=air+fuel+spark.

The turbo HP spec is given without any consideration to your car/build.
The turbo HP spec is based upon the turbo capability of moving air, and for any given air volume you must apply a specific amount of fuel.

The air volume and fuel volume will be quite the same for any given HP on any car/build with the same turbo, this is way you can calculate your injector size without any consideration of the car/build.

There for I think it will be safe to say that for a specific HP output you can calculate the fuel amount that will be needed hence mileage.

Of course I'm talking rough numbers and just a rough estimation of mileage with a specific turbo - combined mileage - boost and no boost.


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