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Old 10-04-2016, 02:36 PM   #1
TGT
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If anyone can help that would be great

I am turboing my miata on stock ecu. i have read around and have seen that people are saying that if you are running 91 fuel then advance timing by 10 degrees (with an intercooler) and 8 degrees (with out an intercooler). I will be running mine on 95 fuel so what would I advance the timing to with and without an intercooler. at the moment non turbo I am running 14 as I have read that is the best for U.K. Spec miatas to get the most out of the fuel?

Thanks in advance
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Old 10-04-2016, 02:56 PM   #2
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You buy a proper ecu and advance/retard timing different amounts in different places
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Old 10-04-2016, 03:00 PM   #3
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I would but I have no money and just want to turbo so I am turboing on stock ecu with an fmu for the mean time till I have enough money to get an ecu
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Old 10-04-2016, 03:05 PM   #4
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If you don't have money for ecu, then you don't have money to turbocharge your car properly.

We don't encourage bad decisions around here. Proceed at your own risk.
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Old 10-04-2016, 03:42 PM   #5
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Quote:
Originally Posted by TGT View Post
I would but I have no money and just want to turbo so I am turboing on stock ecu with an fmu for the mean time till I have enough money to get an ecu
Supporting mods and ecu/injectors before you even purchase a manifold or turbo. Your car will thank you.
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Old 10-04-2016, 03:46 PM   #6
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If you insist on doing it anyway; the rule of thumb is 1 degree of retard from stock for each psi of boost to be safe.
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Old 10-04-2016, 03:48 PM   #7
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Fun fact: Your UK "RON 95" Octane is the same as our US "(R+M)/2 91" Octane
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Old 10-04-2016, 04:03 PM   #8
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This isn't difficult guyths.

10 degrees, 91 octane. 91/10 is 9.1, so for every 9.1 of octane you can add a degree. so if 95 octane, then 95/9.1= 10.43956043956044*. RON? MON?... don't matter, ignition timing is absolute, not relative.

Now our crank pulleys aren't that accurate, so round to 10.440 degrees.
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Old 10-04-2016, 06:00 PM   #9
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advance 10* from 14*
24* at 10psi should pull a premium
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Old 10-05-2016, 12:37 PM   #10
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Per the sebring supercharger manual, set the timing to 8* base timing for 93 octane (us), 6* for 92. Don't run lesd than 92. Your 95 RON fuel is the same as US 91 or so. So I woulf say set it to 4* base timing.

Stock base timung is 10*.

You are going to have no low end power retarding the timing that much. Your car will run like poop when it transitions from vaccume to boost. You will have massive lean tip in and hesitations. It will throw a code for the O2 sensor and other things.

Also, you are going to install a wide band to make sure that your AFRs are reasonable under boost. That is not a question.

By the time you get the car running well on an FMU, you will have spent the same on piggy backs and helpers as you would have to get a used tuneable ecu.

Can it be done? Yeah. If you are asking how to do it, you don't know enough to do it properly and not blow things up. Read more.
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Old 10-07-2016, 11:37 PM   #11
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Just stop. Save up for an ECU or don't do it at all,
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Old 10-08-2016, 09:39 PM   #12
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I'm going to be polite.

You are going to crack piston rings on a daily driver you can't afford to repair.

And you're a ******* retard.

Last edited by sixshooter; 10-09-2016 at 02:28 PM.
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