is it possible for an ECU to hold two seperate maps?

eg; one for 91 RON fuel and one for 100 RON.

and if it is, is it possible to switch between the two?

(please lets not discuss the pros and cons between Autronic/SECS/L6?L8/P8)

 

im interestead in this aswell

 

I know Pectel T6 2000 can do this.

 

If this is to do with cossies....

It is possible with extensive modifications and only the select few can do it on the factory ecu's.

However, if its only an ignition change you require,
the ignition is easiliy retarded for lower octane fuels by linking the octane connector.
This can retard the ignition by 2, 4 or 8 degrees depending on the car/ECU and chip fitted.
This will of course need proper testing with DET headphones on the new fuel
and also would probally require a boost drop to be safe too.


Oh and yes S8 does it !

 

Hyperthetical situation.

Take a cossie to the states, you can use 91 ron but also have available SUNOCO 100 ron fuel at the local drag strip.

Could you fill up with the good stuff, switch over the map and have fun.?

 

with cossie ecus you can piggy back the chips,, im sure msd sell a board just right for the job

with a t6 its alot easyer,,, well a flick of a switch

 

GARETH T, With that method, it is easy to do on the factory ecu's too !
And way cheaper than a T6

Fit a chip with twice the memory size, load both programs and switch the
high order address line LIVE to change maps !!!

You would of course need two chips with suitable maps for each stage
that have a common base operating program.

 

i was on about doing it with two eproms,, but i guess a rom with twice the memory is a better way

 

GARETH T, Still a valid way of doing it though !

I soldered two on top of each other before (one with proper flamer map in it )

[TECHIE ON]
Then gated the chip selects through some NAND gates (reverse logic dont forget)
via the original ecu chip select output.
[TECHIE OFF]

This is more complicated than the bigger chip way BUT works equally well

 

We do this modification for almost any ecu that uses an Eprom for its run software as long as it doesnt do live checksum comparisons.

No problem at all for the old cossies.

 

These guys market one for the grale which uses a very similar ecu, i cant believe you cossie boys havent got this already as your so well catered for.

http://www.evocars.com/acatalog/EPROM_Lancia.html

 

Stu @ M Developments,

I did say only the select few can do this and you are definitely among them

 

Wouldnt even know where to start with the one you just mentioned though Simon

 

You can do a offset map with SM4 for race fuel,Or Carry a laptop and you can have 100maps

Mark

 

Moose 130,
mark,,,, ahhh hummm

 

ive had dual maps inmy car for about a year or so now

would be able to demo it for the purposes of this topic for genuine MSD customers

 

very interesting, didn't know that it was possible on the marelli ecu. you is some clever people