I need to know a few things about the BP ecu found on the 90-94 twin cam proteges.
First what is the rev limit?
Do your cars use a four wire optical dissy?
How is the ingintion controled? ie.. Extra to the ecu does it have any sort of igintion control box?

Reason I'm asking these questions is I own a 626 with a JDM FE3 motor. t would seem that the protege ecu will control my motor better than the USD 626 ecu. I just need to know what all must be changed.
Also does anyone have a wiring diagram or the pin outs on the ecu?
Your cars use a 5 volt maf sensor. What diameter is the maf? Can it be replace wit a larger flowing unit.
How many verants of the bp ecu are there and was one model fast/ have better tunning than the others.
thanks
evo

 

Are you running the F2 ECU right now??? I imagine you are but yanever know. The BP might be a good possibility, but I dont think anybody has tried this yet. You might want to talk to Jay B. about this, if you need his contact info let me know (since you have an FE3 though, you prolly have already talked to him).


Also, what ya got planned for the FE3???

 

FE3s been installed for many months now and been running on the F2 ecu. I talked to JayB not to long ago (yesturday) and he said he would look for a twin cam bp ecu and loom for me. So thats why I'm asking the questions.
The F2 to BP ecu swpa has been done before just looking into it more cause hopefully Jay will have one for me soon.

Once I get the BP ecu then I'll finish getting it tuned and do some body work and interior work. I'll work on getting the car into the mags as one of the only example of a non rx7, jdm mazda.
After that or before that I'll be going turbo at 7-10psi. THe car will have a 5th injector and be water/alky injected. I'm more worried about the tranny than the engine cause I've already broken a cv, hub and diff so I'll have to be careful with the added boost.
evo

 

So your cars are using VAF not maf. Seeing as the RX7 vaf will work on the 6, then the rx7 VAF and your vafs could be a 3-8volt systems not the stardard 5 volt system.
If it is a 5 volt system then it would be easy to use a 5volt maf that uses the same analog siganl then.
What is the voltage range of the BP VAF 0-5 volt or 3-8 volts?
evo

 

bp ecu from japan has knock control,it uses 5v maf and i know it wont work with mx6 maf it,reads opposite from bp maf so for turbo bp ecu i used maf fom early turboII rx7.rev limiter is at 7000k rpms.it uses knock conrol module same as mx6 turbo.

 

I dont want to use 626 VAF. Its one of the limiting factors of our cars. MAF is much better.
So what your saying is that US spec BP proteges use the 3-8volt vaf system.
JDM turbo bp used 5 volt maf system.
I want which ever ecu that uses 5 volt maf so do any of the protege twin cam use a 5 volt system maf or vaf?
evo

 

redline is 7000rpm, rev limiter/fuel cut is 7200 or 7400rpm, can't recall right now.

stock Protege VAF is 2.5" diameter, the B-code RX7 VAF is 3" diameter. The RX7 VAF only flows more at 6000rpm and above, about a 5hp boost on an N/A engine. Will work find for a turbo engine, but i don't know the gain figures.

no extra ignition control box that i know of, or can recall.

 

i ment to type vaf both j spec and us cars use vaf

 

So if Im reading right both the Jspec and the US verisons uses VAF.
They both are 0-5 volt systems correct?
I need one that is 0-5 volt becasue nothing will work in tuning the 3-8 volt systems.
If you dont know what the voltages is then maybe you know if something like the APEXi super afc would work with the USDM twin cam portege? If it does then your cars use the 0-5 volt system.
evo

 

ye im using safc on it butass soon u car hits 100 % throtle ecu goes in too limp mode.u wantto ask more questions u can aim me at d2maz

 

So does anyone know for sure what the VAF range is?
evo

 

Its already been done. The sensors are almost the same and the BP twin cam uses an optical dissy much like the FE3. In fact the bp was based off the FE3.
Basicly any ecu can run any motor.
I mainly want to know what the VAF voltage is.
evo

 

i know vaf gets 5v.also bp us spec dont have tps only has idle switch and full throtle switch on manual trans engines. on automatic trans engines ther is tps but its use to detect load for trans operaton.

 

Is that number from a tech manual or your tach? Because my fuel-cut hits at 7500 indicated, but I've checked my tach and it's off (high) by about 4% over pretty much the whole rev range.

 

The VAF is 0-5 volts and reads backwards 5 to 0. The TPS is the same way but only reads 0% or 100%, it does not have a sweep.

Quit messing with stock ecu's and put some real tuning into that thing!