Rev limiter vr6 ecu's

taiajam · Post by **taiajam** » Wed Oct 21, 2009 7:09 am

hi,

where can i find the rpm limiter for the vr6 ecu's?

thanx

tom · Post by **tom** » Wed Oct 21, 2009 11:10 am

number your ECU please

taiajam · Post by **taiajam** » Fri Oct 23, 2009 2:58 am

well, actually all of 3 types wich are listed at the definition list.

for the distributorcap ignition and 2 coilpack ingnition types.

another question...

a definition file for the obd2 vr6
ecu number
021 906 256

tom · Post by **tom** » Sun Oct 25, 2009 1:52 pm

I know only for this ECU 021906258BK -rev limit A378

magner · Post by **magner** » Mon Nov 02, 2009 7:53 am

can you help with rev limit for 021 906 258af please

taiajam · Post by **taiajam** » Sun Nov 29, 2009 2:35 pm

thankyou tom, i will test this out asap.

I think BK and AF are the same.
because i did use the AF bin file, and it works in the BK engine.

Ok just tested, and now i wonder.. is it a 8bit of 16 bit map?
When i look at A378 i find the hexadecimal '03'
and in 16 bit mode in an hexeditor it says '0403'

that doesnt seem to fit a suitable rpm limit like the stock 6500.

***********
POST EDIT !
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The BK and AF are not the same. What i did, was change an CH ecu with some other ecu, but now i cant remember what ecu type..

magner · Post by **magner** » Mon Nov 30, 2009 8:27 am

hey taiajam at a378 in the 258bk i find 141 dec the 03 is at a379

magner · Post by **magner** » Mon Nov 30, 2009 8:40 am

the af is different to the bk maps are in differnt locations plus not the same ecu type and af runs 5 wire maf if a378 is the revlimit for the bk ecu then a35a is the revlimit for the af ecu

tom · Post by **tom** » Mon Nov 30, 2009 12:44 pm

Where is rev limit in file from 256 ECU ??(2.9 engine with distributor spark)

taiajam · Post by **taiajam** » Tue Dec 01, 2009 2:09 pm

Hi magner,

hey taiajam at a378 in the 258bk i find 141 dec the 03 is at a379

how do you translate 141 dec to a revlimiter?

did you already tested the revlimiter for the AF @ a35a hex ?

taiajam · Post by **taiajam** » Wed Dec 02, 2009 11:42 pm

tom wrote:Yes stock value is 141, I don`t know formula but if you change value to 132 rev limit rise to 6800. Maybe you know where is rev limit in file from ECU 256?? It`s from 2.9 engine with distributor spark

so you changed it to 132 dec or hex?

If its a 2.9 engine with the code 256 i dont know.
if its a 2.9 engine with the code 258 AG we could probably find it...

AG software is the similair to the 2.8 vr6 258 AF.
its not exactly the same, fuel/spark is less agressive but the layout is the same.

magner quotes that the revlimiter in the AF is @ a35a.
so its should be at a35a for the AG aswell

I will post this on the forum also, so other people can use this info.

tom · Post by **tom** » Thu Dec 03, 2009 3:42 am

dex, I need adress rev limit in file from any engine with distributor spark

taiajam · Post by **taiajam** » Thu Dec 03, 2009 5:59 am

DEX ????

usuallt motronic uses a formula hex -> dec (141 in this case) * something like 40.
but obviously it doenst apply this time, because 141*40 = 5640

tom · Post by **tom** » Thu Dec 03, 2009 7:41 am

sorry, my mistakes, DEC

magner · Post by **magner** » Thu Dec 03, 2009 9:16 am

hi guys ive no idea on the exact formula ive been playing with google calc trying to make sence of it ive come up with this copy and paste into google

2750000 / (141 x 3)

try changing the 141 dec lower for a higher rev limit and see if it looks about right to you ?

2750000 / a378 x a379

ive not tested my revlimit because my car is in bits at moment

please post results

taiajam · Post by **taiajam** » Thu Dec 03, 2009 12:28 pm

I cant test either, because i have to tune a BK ecu this weekend, but i only cannot change (and test) the rev limiter because i only get the ecu by mail.

interresting formula. i searcht the internet and came across an old porche diy hextuning guide. with a similair looking formula for the revlimiter.

if the 2750000 / (141 x 3) is 2750000 / a378 x a379 .
what and where is the 2750000 in the hex ?

change value to 132 rev limit rise to 6800.

2750000 / (132 x 3) = 6944 not 6800
so or the formula is incorrect or the tacho or toms reading capabilities are not OK

but were getting close.. but still not there...

tom · Post by **tom** » Fri Dec 04, 2009 9:49 am

taiajam wrote: 2750000 / (132 x 3) = 6944 not 6800
so or the formula is incorrect or the tacho or toms reading capabilities are not OK but were getting close.. but still not there...

I check RPM only on tacho

so I think it`s correct formula

taiajam · Post by **taiajam** » Mon Dec 07, 2009 3:01 am

Do I need to recalculate the cheksum when i change the revlimiter?
and how do i do that?

magner · Post by **magner** » Mon Dec 07, 2009 4:05 am

sent you a pm

taiajam · Post by **taiajam** » Mon Dec 07, 2009 4:18 am

there is an option in tunerpro, but does it calculate is automaticly?
and i would like to be able to calculate so i can do it in the future again.

x_system · Post by **x_system** » Sat Nov 06, 2010 9:55 am

Hi, i'm searching for 0 261 203 210/211, 021 906 258 CG .bin file, from vw passat vr6 2.8 engine with 4 wire MAF and 5 wire coilpack, could anybody help me ?
Thanks