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#1
RazerX

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I recall reading a thread on what manufacture codes on the ECU that indicated year, CA/Federal, MT/AT, etc.   But when I search on ECU nothing comes up.  Can someone point me to that thread.  

 

I need another ECU for 99 and i am in CA but the car is Federal car.  Will it make a performance difference if i put a CA ecu in it?

 

Regardless I need codes so I buy a used one i know i am getting the right one.

 

Thanks.  


 - Speed

 

 

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#2
Johnny D

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 BP4W

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#3
RazerX

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Thanks Johnny,  is that a Fed or CA for a 5spd?


 - Speed

 

 

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#4
Johnny D

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Fed, Manual

You can look at all the different ones at Mazda Motorsports under Control Unit, E.G.I

J~


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#5
Ron Alan

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I think I have both David....

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#6
fotostars

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I think I have both David....

 

Warning: Thread Hijack

 

Hi Ron  :banana:  , are you coming with Kyle to the NCRC Weekend to play with that new 99 you built? That would be great to have him in the field...


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#7
Ron Alan

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Go to the correct thread :)

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#8
Johnny D

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Ron has the better deal/$

 

Richard, Please lets try to use the Personal Messenger before the Hijacking :)

J~


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#9
fotostars

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Go to the correct thread :)

 

 

Ron has the better deal/$

 

Richard, Please lets try to use the Personal Messenger before the Hijacking :)

J~

 

Sorry guys, was reading my forums backward last night :-) I'll be mindful of this next time....

 

David, good luck putting your car back together. See you next weekend!


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#10
tra68

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Am I giving up any legal performance gains if I don't switch from a California ECU to a Federal ECU after replacing the California exhaust manifold with the Federal exhaust manifold?

 

Thanks in advance for your help.


Todd Ayers


#11
Tom Sager

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Am I giving up any legal performance gains if I don't switch from a California ECU to a Federal ECU after replacing the California exhaust manifold with the Federal exhaust manifold?

 

Thanks in advance for your help.

Mr. Drago is probably best to answer this, but on my car (also a CA car) I recall that the air fuel curve when switching the ECU was slightly different with each ECU but the difference was across the whole RPM range.  That only meant that you needed to tweak fuel pressure for each ECU but once that's done you end up in almost the same place in terms of A/F ratio.  This is a little fuzzy since it was a few years ago.  I ended up using a 49 state ECU but I don't think it's an advantage.  


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#12
tra68

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Tom, thanks for the response.

 

A quick follow-up ... is it reasonable to assume then, based on your experience and recollection with respect to the A/F curve, that if I'm not currently running an adjustable fuel pressure regulator that the mapping from CA ECU would not be optimal with the Federal exhaust manifold?


Todd Ayers


#13
Tom Sager

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Tom, thanks for the response.

 

A quick follow-up ... is it reasonable to assume then, based on your experience and recollection with respect to the A/F curve, that if I'm not currently running an adjustable fuel pressure regulator that the mapping from CA ECU would not be optimal with the Federal exhaust manifold?

Without an Air/Fuel gauge and without an adjustable regulator, you are flying blind. Most here would not recommend that.  You should really invest in a gauge at the very least so that you can see what your A/F is.  It could be a long way from optimal and you will for sure get some benefit from installing both. Without knowing you could be too rich or too lean which means less power and too lean over a period of time could damage the engine.  Any number of people that own a '99 or '00 could send you a dyno plot showing what good A/F is on that car so that even if you don't get to a dyno, you will have a target to tune to.  


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#14
38bfast

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Anyone (all years) can benifit from a AFPR. If you want to extract all you can it is highly recommended that you data log pressure and AFR. You would be amazed at how much AF will change with weather.

Dyno tuning will tell you what AFR makes the most power or torque and than you ajust the FP to match that number on track for that day. In most cases Dyno FP will not match on track FP.

Another benifit of logging pressure is when a pump starts going bad you can replace it before it cost you a race.
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#15
Mike Collins

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The last time I looked into it there were as many as 27 different factory "flashes" for a '99 ECU. The adjustable fuel pressure regulator and timing negates any advantage one flash over another has....
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#16
SaulSpeedwell

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Mr. Drago is probably best to answer this, but on my car (also a CA car) I recall that the air fuel curve when switching the ECU was slightly different with each ECU but the difference was across the whole RPM range.  That only meant that you needed to tweak fuel pressure for each ECU but once that's done you end up in almost the same place in terms of A/F ratio.  This is a little fuzzy since it was a few years ago.  I ended up using a 49 state ECU but I don't think it's an advantage.  

 I agree with this.  Changing ECUs will often make a small difference, but any given ECU can be optimized to the same point.  It seems each ECU is a bit off in terms of its "timekeeping" - but once you dial the A/F and timing in, all *stock* ECUs of a given part number are the same. 

 

Point being, if you bolt in an ECU and see a gain on the dyno, it is most likely due to happenstance of timing and AFR, and the same gain could have been achieved with the old ECU if you had gotten the timing and fuel pressure right.  And yet - if swapping the ECU is a cheap and easy way to stumble your way into better timing or AFR, what is wrong with that?  :)  Nothing, I say.  Just don't mislead yourself that the ECU was magical ... it was just a happenstantial good fit for your car.


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#17
SaulSpeedwell

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Anyone (all years) can benifit from a AFPR. If you want to extract all you can it is highly recommended that you data log pressure and AFR. You would be amazed at how much AF will change with weather.

Dyno tuning will tell you what AFR makes the most power or torque and than you ajust the FP to match that number on track for that day. In most cases Dyno FP will not match on track FP.

Another benifit of logging pressure is when a pump starts going bad you can replace it before it cost you a race.

 

Great advice, Ralph, I agree with this 1000%.  Fuel pressure logging or gauging is HUGELY underappreciated, and even more important than wideband A/F if you ask me, since fuel pressure is a cause and A/F is a resulting effect.  When you are on the dyno, you aren't going left or right at 1g.  I always had a fuel pressure gauge in my car.  If/When the car stumbles, I would look at it - and if it was solid, I knew my problem WASN'T fuel.  And if the fuel pressure WAS varying, I knew I had a problem. 

 

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#18
Steve Scheifler

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I still believe in magic. Besides the magic LF "spindle" which provides extra camber (unmodified, not bent), I also have a magic 1.6 ECU. In repeated A/B tests in two different cars, after believing we had the optimal tune we switched ECUs and got more power. I was very skeptical so I tested it multiple times on two cars and always got the same results. I know exactly why the spindle gives more camber, but I still don't know why that ECU makes more power.

But theoretically, I agree entirely with both of you, just don't try to take my magic ECU away from me.
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