Fuelling difference between UK and JDM cars

Any form of normally aspirated power mods.
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13Black
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Fuelling difference between UK and JDM cars

Post by 13Black » Wed Jul 20, 2016 11:50 pm

Hello. Just a quick one.
Managed to get a JDM car in today to have a look at the fuelling which was thought to be mapped richer on the bottom end resulting in apparently less grunt. This turned out to be not the case it seems.
Caveat: UK car was a 192 manual. JDM car was a 192 Auto. I have no other JDM or Auto ECU files to compare so I'm going to assume manual and auto maps are the same for now. Values from the 88% Load column which is roughly WOT.

Higher points on the y axis are where the JDM car is leaner (AFR), negative values are when it's richer.
The x axis is RPM going up in 500rpm increments from 0 along to 7,000 rpm.
JDM Fuel difference.jpg
JDM Fuel difference.jpg (24.08 KiB) Viewed 2353 times
What use is this to people...? I've no idea. The plan was to see if the UK maps were leaner overall and whether flashing this map onto the JDM car would improve performance but judging from the data, I don't think it's overly rich enough to contribute any noticeable drop in performance.
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Re: Fuelling difference between UK and JDM cars

Post by Phil Bate » Wed Jul 20, 2016 11:58 pm

Interesting. Can you send me the .hex from the JDM auto? I will run the compare ECU function against the 192 manual ROMs I have and take a look
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Re: Fuelling difference between UK and JDM cars

Post by 13Black » Thu Jul 21, 2016 12:11 am

Sure, PM that email address.
Ignition is 99% the same both leading and trailing.
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Re: Fuelling difference between UK and JDM cars

Post by Phil Bate » Fri Jul 22, 2016 11:19 pm

Got the ROM, cheers Nick :)

Though I just remembered my MazdaEdit license has expired again #-o I'll report back once our Russian friend has sent me a new one
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Re: Fuelling difference between UK and JDM cars

Post by MadTaz » Fri Jul 22, 2016 11:48 pm

Let me know how you get on with Phil, he keeps putting expiry dates in the keys I don't know why? Mine runs out now in 10 years but has expired twice

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Re: Fuelling difference between UK and JDM cars

Post by Phil Bate » Sat Jul 23, 2016 12:27 am

It expires every year mate. You have to get a new key whether you pay for the support or not
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Re: Fuelling difference between UK and JDM cars

Post by MadTaz » Sat Jul 23, 2016 7:55 am

Hope you got it sorted mate, he can be a funny one at times.

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Re: Fuelling difference between UK and JDM cars

Post by bigpete » Sat Jul 23, 2016 11:12 am

I paid for support this year again. He said this time tho that when I renew next year just to say I don't need support and it will be free.
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Re: Fuelling difference between UK and JDM cars

Post by MadTaz » Sat Jul 23, 2016 8:33 pm

How much was support for you Pete? He quoted me $250 which I thought was a little pricey

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Re: Fuelling difference between UK and JDM cars

Post by MadTaz » Sat Jul 23, 2016 9:30 pm

Phil,

Would you mind sending me a stock 192 ecu when you get chance mate.

Cheers

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Re: Fuelling difference between UK and JDM cars

Post by bigpete » Sun Jul 24, 2016 5:24 pm

Carl that sounds about right to me $250 there are some updates in it as well.
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Re: Fuelling difference between UK and JDM cars

Post by 13Black » Mon Jul 25, 2016 6:19 pm

MadTaz wrote:Phil,

Would you mind sending me a stock 192 ecu when you get chance mate.

Cheers
I can send one over if Phil hasn't done so yet?
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Re: Fuelling difference between UK and JDM cars

Post by MadTaz » Mon Jul 25, 2016 7:41 pm

Cheers that would be great, PM inbound

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Re: Fuelling difference between UK and JDM cars

Post by Phil Bate » Mon Jul 25, 2016 11:10 pm

Sorry Carl I've been up against it, thanks Nick
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Re: Fuelling difference between UK and JDM cars

Post by Juey » Thu Jul 28, 2016 4:50 pm

.....and oddly it's at 3000 rpm (step 6 on axis) that my car really picks up (when it starts getting richer than a 192 manual), then again at 5250rpm (step 11) as is normal.
All very curious......

(JDM auto data from my car)
Black Cherry Mica
JDM Evolve. 192 6 spd manual from auto
I can explain it to you, but I can't understand it for you.

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Re: Fuelling difference between UK and JDM cars

Post by Phil Bate » Mon Aug 01, 2016 3:10 pm

Nick - when you get a minute can you re-save that ROM with the 'Can be shared' option ticked in File Information and send it again?

Cheers
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Re: Fuelling difference between UK and JDM cars

Post by Phil Bate » Mon Aug 01, 2016 10:14 pm

Ok got it thanks Nick. There are many differences between this and a UK 192, however I do wonder if most of them are more to do with it being an automatic.

Perhaps most noticeably, the Warm-up RPM Limit ECT Threshold is set to 0deg on the import :!:
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Re: Fuelling difference between UK and JDM cars

Post by 13Black » Mon Aug 01, 2016 10:25 pm

To be honest.... is that reaaaaally that much worse than Mazda's Manual 20deg threshold :( they might as well have not bothered.
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Re: Fuelling difference between UK and JDM cars

Post by Phil Bate » Mon Aug 01, 2016 10:43 pm

That is true. Pretty useless
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Re: Fuelling difference between UK and JDM cars

Post by delta0 » Wed Aug 24, 2016 1:31 pm

Would be interesting to compare a JDM 232 with a UK one.
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Re: Fuelling difference between UK and JDM cars

Post by 13Black » Wed Aug 24, 2016 2:25 pm

Any offers? Castle Combe in September? :D
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-= Clicky click for build thread =-

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