Mapping question

[TiddlesRX7]

Yeah I get that bit. But what does it tell the ECU to do in regards to the fueling etc and is it really safe to use this method rather than some experienced ECU manufacturer?

[grinder]

its a lot cheaper !!

it will have a remapped fuel curve to support the upped boost levels

image that your ecu is mapped perfect for .5bar of boost ( stock ECU ) now picture this one having a map for .9 bar of boost

im not sure how to explain it to be honest

it doesnt tell the ECU anything - it becomes the ECU

[20B_boy]

and have not leaned at all according to the fuel/air lambda.

What device are you using to determine this? unless its a wide band o2 sensor you have no idea. The normal sensors that come with cheap \'air/fuel\' gauges are pointless on a rotary.

[TiddlesRX7]

OK. I\'ve looked into the Ebay chips but im getting conflicting answers. In the ad on Ebay it says boost levels of up to 14.5psi. But when I ask the guy what the chip is mapped at he says

Hi,

The ECU doesnt control the boost, it is mechanically controlled by pressure activating a wastegate therefore fitting the chip alone will not increase the boost. To control the boost you would need to fit a bleed valve or boost controller, then you will be able to run anything up to 14.5psi.

Regards
 

So am I right in thinking that this thing is just telling the ECU to add more fuel?
STU what you said before made way more sense than what this guy is saying. Maybe im just getting hold of the sh**y end of the stick or something.

[pdtaylor18]

What device are you using to determine this? unless its a wide band o2 sensor you have no idea. The normal sensors that come with cheap \'air/fuel\' gauges are pointless on a rotary.

Of course i\'m using a wide band lambda sensor !!!  What gave you the idea that i use cheap crap  because we have FC\'s does not mean we are the poor end of the line.  Shame on you for even suggesting that.

The chipped ECU\'s do adjust the whole of the fuel curve, they also get rid of the speed limit, ability to raise the boost levels with a boost controller and get rid of the fuel cut.  Most you can use on a stock engine, i did and had great results but it did overfuel at times.  You need some mods to make best affect on these.  The chap does belong to this forum so maybe he can explain what he does and to what levels its based on.  All i\'m saying that its a cheap alternative and certainly better than a stock ECU if you are running any sort of mods, especially de-cat, exhaust and intake.

[pdtaylor18]

This is the info that came with one i picked up from Japan.
JDM Mecha Gozira Ecu
 
Removd from a 1990 FC3S
N374 Ecu 1989 to 1991 Mazda RX-7 Turbo II
 
Aftermarket Exhaust
Aftermarket Intake Filter
Stock or Aftermarket Intercooler
Boost UP
1、Eliminate 180km top speed limiter
2、Shift rev limiter timing
3、Eliminate boost limiter
4、Modification of fuel correction map and Ignition map
5、Change quorum (k)
6、Change lattice of the map (RPM, injection time)
7、Modify every correction points

[grinder]

14.5 psi - so thats just a touch over 1 bar

hummmm i dont see why you need a boost controller to UP the boost ??

running the chip with your mods should see you are .9 bar anyways - so im a little confused at what he is saying

hummm he is right to a certain extent - that the ecu doesnt control the boost - but as soon as you put a straight thru exhaust on - that alters the boost as it all breathes easier - hence you need a FCD - this fools the car into not cutting fuel to the back rotor ( i think )

[20B_boy]

Of course i\'m using a wide band lambda sensor !!!  What gave you the idea that i use cheap crap  because we have FC\'s does not mean we are the poor end of the line.  Shame on you for even suggesting that.

1) I didnt \'get the idea that you use cheap crap\' - I merely asked in case you might not have been aware of the inadequacies of narrow band sensors, my bad for giving a **** about u risking a motor eh? :mad:

2) Again I didnt suggest anything, if you (I emphasise \'you\') want to \'blame\' some one for tagging FC owners as cheap skates point at "I\'ll buy that for a $"-Grinder :rollin

Shame on me for nothing, glad to be of help (I\'ll make sure not to again ;-)) :Hammer

[grinder]

im not cheap matey - i just dont like spending money

[TiddlesRX7]

im not cheap matey - i just dont like spending money

But you should present Bargin Hunt or whatever the program is called not that Dickinson bloke!

running the chip with your mods should see you are .9 bar anyways - so im a little confused at what he is saying

Your not the only one who\'s confused. I just wanted to know what boost level I would be running with the chip without a boost controller. I would have though if your selling a product like that you would know the answer to something ilke that. The last thing I want to do is plug it in only for it to break something cause of something silly.

[Brett]

With a 3" turbo baqck exhaust, no boost controller and an FCD/chipped ECU the boost can spike as high as 1.2bar, but you would normally see around 0.8-1bar in the first 3 gears, sustaining 1bar+ in 4th and 5th.  The Turbo wont last long at more than 1bar and is a long way outside of its range at that point.  Get it set to no more than 1bar :yes

[pdtaylor18]

1) I didnt \'get the idea that you use cheap crap\' - I merely asked in case you might not have been aware of the inadequacies of narrow band sensors, my bad for giving a **** about u risking a motor eh? :mad:

2) Again I didnt suggest anything, if you (I emphasise \'you\') want to \'blame\' some one for tagging FC owners as cheap skates point at "I\'ll buy that for a $"-Grinder :rollin

Shame on me for nothing, glad to be of help (I\'ll make sure not to again ;-)) :Hammer

Think we both might have had a spat when there no need, sorry if i came over wrong or misinterepted your statement.  We(I) always need to get the feedback from people like yourself and its what the club needs, I\'m not however going to give information out thats only partially accurate.  We all value our engines and I for one would not give out info that would cause an engine to go pop.  I merely stated that in this case I was monitoring the lean/ fuel air mixture with my lambda sensor and did not notice anything lean with my current setup.  I should have stated that i was using a wide band sensor as I assumed that this was a given bit of knowledge.