OBD1 motronic tuning thread?

[Jefnes3]

re: Blow thru maf

Sure this works already. The issue is density error at the maf.
So, once you able to properly map the fueling, you'll be able to map out the error.

-Jeffrey Atwood

[TIGninja]

all very intresting, definatley watching. dont quite understand all of it yet but it is something i would like to learn.

one question though... does this have the potential to convert tunes to blow thru maf tunes?

To do this by altering the tables is going to be kinda tricky. What I am doing is opening the door for you guys. What you do when you get in is up to you.

[tomslik]

Hey thanks for the post... I need zero to hero help but this is a good start. The beginning of the tread, well that wasn't the English I recognize

[B4S]

Back from the dead...
The software I was talking about earlier now seems to be heading for an update to v.2...complete with M2.9 configuration data already included . Next wed is the day I'll be springing for the update, can't wait!

[TIGninja]

Everyone have your bin file downloaded? Its time to get this party started.

http://www.easy-share.com/1911398084/ABA_OBD1.bin

[B4S]

I'm ready coach!

[TIGninja]

You dont need any of these things yet to learn this and if your tuner already has them you may never need them

This is the equipment you will need eventually,however most places that have a dyno already have these things.

BURN2 Chip Programmer [BURN2] - $85.00 : Moates.Net


This is the ostrich. Most honda tuners now have the V2.0 ostrich so this can be done by them.

Ostrich 2.0 : The New Breed [OSTRICH_2] - $175.00 : Moates.Net

And a couple of EEPROMs. I would get two or three of these. Most of your tuning is going to be done with the emulator. Again this is something that most honda tuners already have in stock.

C2 SST 27SF512 Chip [C2] - $5.00 : Moates.Net

[TIGninja]

Now for the free software that you will need to download.

here is a good hex editor that will be used for a while to show you the principles of how to do this. Most of the things we will be learning are going to be done automatically by the software that we will be using as well.

http://www.x-ways.net/winhex.zip

Here is the main tune software that we will be using.Its called tunerpro and its a configurable software the is specifically for tuning chip files.Its free however I recomend giving the developer some $$$.

TunerPro and TunerPro RT - Professional Automobile Tuning Software

Also get your winols demo right here. Its very good for identifying maps.

Download WinOLS DEMO 1.098 - Free Download Review at Shareware Connection Software Portal, No Crack Serial Number, No Key Warez

[TIGninja]

Before we can do anything we need to know how to correct the checksum. Once you learn how to do this you will be ready to start (kinda).

Lets start out with the 93-95 OBD1golf/jetta chip file.Everybody get it downloaded and we will start here.

Now open up your hex editor(winhex) and open up the file.The first thing we need to do is find the checksum and be able to recalculate it.

The checksum in most motronic chip files is by the file ID tag.This is usually located after most of the code and the maps in the file(we will get to that later).In this case its at CF00 and CF01.The checksum is a 16bit checksum and is the total of the block from 0000-CEFF.If you click edit- define block and type in the 0 for the start of the block and CEFF for the end of the block the hex editor will highlight that part of the chip file.Now you have the block selected to checksum.Click tools-calculate hash.On the drop down pick 16bit and then OK.That will spit out the checksum of the block.You will also notice this matches the locations CF00 and CF01.

[TIGninja]

Ok when everyone gets caught up here we will move forward on how to set this up to do it automatically in tunerpro. I just want everyone to understand what we are doing here first and it give everyone a chance to get used to dealing with what seems to be a bunch of random numbers and letters.

[B4S]

That checksum is a pain in the behind, having tunerpro fix it automatically will make tuning a lot easier.

[TIGninja]

That checksum is a pain in the behind, having tunerpro fix it automatically will make tuning a lot easier.

Well if you have a good checksum when you start the car you will be fine until you shut it off if you emulate. Then all you would need to do is to checksum when your done tuning,but the easiest way is to have the checksum update everytime you upload.

[B4S]

Nice, good to know. I've barely had a chance to emulate any OBD1 cars yet, but the ones I have tinkered with never popped a CEL during emulation...always wondered why. I'll be playing with winhex tonight, thanks for the info!

[magner]

how does this timing map look for a 8.5.1 compresion vr6t base map if i alter all three 16x1 wot timing maps to the same value
plus the 4 12x13 timing maps to the same value marked yellow is the peak load areas
on the stock timing map and lower pic is the lowered timing map example




im aware i will have to be carefull with det and log timing with vag-com to see if any is being pulled

[B4S]

With low compression, I'd say you're definitely on the safe side of the timing at WOT/boost.

I really love the 'tune-it-yourself' community

[magner]

Well if you have a good checksum when you start the car you will be fine until you shut it off if you emulate. Then all you would need to do is to checksum when your done tuning,but the easiest way is to have the checksum update everytime you upload.

i find tunerpro only corrects the checksum upon saving the altered bin . then as you say you have then upload the saved bin to the emulator again then all is good no checksum fault code

[TIGninja]

This thread isnt really about tuning theory but that looks decent. One thing to keep in mind is there is another map that is either a 1 by 12 or 1 by 16 that runs full throttle timing. That could pretty easily make for a bad day for you.

Also your XDF looks good but we need to scale the MAF on to give the flow readings.

[Daskoupe]

If you guys want some help just ask.

Jeffrey Atwood
United Motorsport

you wanna do a 660 setup for obd1 2.0's?.I'd love to get some more without changing my setup

I'll be watching and listening

[Daskoupe]

tig!
when i click on the winols demo it takes me here?
what do i click

http://www.evc.de/en/default.asp

[B4S]

Right here: http://www.evc.de/en/download/down_winols.asp

[Daskoupe]

having problems finding the checksum.I find the cf00 and then i click and its gone...

[TIGninja]

having problems finding the checksum.I find the cf00 and then i click and its gone...

There should be no need to click on it. Just look at it. CF00 and CF01

[TIGninja]

E64F is the checksum. This is the total of everything in the chip file from zero up until CF00

[Daskoupe]

alright
Now what do we do with this tuner thing

[IHookItUuup]

lots of info here. I wish this was OBD2.

[TIGninja]

There isnt alot of difference between OBD1 and OBD2

[magner]

=TIGninja;68043946
One thing to keep in mind is there is another map that is either a 1 by 12 or 1 by 16 that runs full throttle timing.............we need to scale the MAF on to give the flow readings
.

the full throttle 16x1 (wot) timing map is what i have shown in the picture ignition wot map1 there is three in total but only one seems to be in use

what do you mean by scale the maf to give flow readings ?

[TIGninja]

the full throttle 16x1 (wot) timing map is what i have shown in the picture ignition wot map1 there is three in total but only one seems to be in use

what do you mean by scale the maf to give flow readings ?

Oh ok I see it there now I cant really see it on my netbook but the rest of the maps look ok. Just keep an eye on knock.

By MAF I mean the other scale RPM/MAF on your tables. When you do it properly the MAF reading on your tune map will match what the vag com reads.

[magner]

By MAF I mean the other scale RPM/MAF on your tables. When you do it properly the MAF reading on your tune map will match what the vag com reads.

ok i see what you mean but i think its rpm vs load on the timing and fuel maps with obd2 you can log mass air flow g/s
but with obd1 i can only log load% and i have no idea of the factor and offset for it
but i dont need to know the factor to tune with data tracing i can see what area of the map is being use at the given load point and just see what the wideband says then adjust the map to the desired afr while driving.
if any one is intrested i will try get some vids up of this in action.. there is three fuel maps in use out of them all one is the idle map1 then it switches to the part throttle map1 as you cruise around then when you put the foot down it goes to the wot fuel map at about 60% tps so you have to tune the fueling in three maps

[TIGninja]

ok i see what you mean but i think its rpm vs load on the timing and fuel maps with obd2 you can log mass air flow g/s
but with obd1 i can only log load% and i have no idea of the factor and offset for it
but i dont need to know the factor to tune with data tracing i can see what area of the map is being use at the given load point and just see what the wideband says then adjust the map to the desired afr while driving.
if any one is intrested i will try get some vids up of this in action.. there is three fuel maps in use out of them all one is the idle map1 then it switches to the part throttle map1 as you cruise around then when you put the foot down it goes to the wot fuel map at about 60% tps so you have to tune the fueling in three maps

Well I will be showing everyone how to set it up in g/s like you are saying. I havent bothered trying to log this either but I know it can be done. I dont have alot of time right now but it is on the list. I dont have a car here to confirm alot of these things so alot of this I am doing from memory. The goal here is to get people going and then let them take over with the development.

[IHookItUuup]

Any news - I'm still following along....

[TIGninja]

Any news - I'm still following along....

Actually yes. I just bought a winter beater and it just happens to be a OBD1 2l

[B4S]

Sweet!

[B4S]

I'm a hair's breadth away from ABA'ing my daily B3 syncro wagon...this would be handy info .

[B4S]

G/S?