You can change the style the forum displays by selecting your preferred style at the bottom left of the site.
We have made an enhancement so that old threads should now link from search results to the correct thread. This is not yet in place for single post links
I run NO MAF with std motronic on my URS4. Cars runs strong, 458Hp for now (will soon push boost to 2 bar) and all is well. How? We use a unichip to simulate MAF from map and rpm. Feed it to the ecu and tune the fueling via this map as well.
no error codes, ecu happy, AFR spot on - always.
Ok, start shooting...
I must say, boost at high rpm MUCH better without maf to suck through
I run NO MAF with std motronic on my URS4. Cars runs strong, 458Hp for now (will soon push boost to 2 bar) and all is well. How? We use a unichip to simulate MAF from map and rpm. Feed it to the ecu and tune the fueling via this map as well.
no error codes, ecu happy, AFR spot on - always.
Ok, start shooting...
I must say, boost at high rpm MUCH better without maf to suck through
Thank you I posted a thread asking how this was done last month
If the MAF reading is unreliable at these power figures then simulating is going to be as good as actual I suppose.
Thinking hat on...................
If the ECU range is 0-5v on a fixed scale and you simulate these values you will still max out at the same value of the MAF within the ECU.
I just wanted to know how this could be done without a MAF but thinking about it there is no gain as you can move the MAF to the pressure side to stop the wire being removed.
On pressure side, its hard to get it to seal without leaking or hoses coming off it, and the wire comes off there too. Inlet side, it just gets in the way and wire comes off.
Wonder if later S4 type hot film MAF can be used?
sigpic
Tom C - www.rcmr.co.uk
Audi UR Quattro
Audi 100 C3 2.0 5 cyl 115ps
Audi S2 - 07k engine project aiming for 800ps
Audi B5 RS4 645ps 911nm
Not maxing out. The fuel map was scaled up so that with "lower" MAF voltage the fueling is correct, although the ecu thinks were now at load site 110, where previously load was 130 at WOT with less boost.
At 034 MS they are experimenting with 4" MAF and motronic ECU tuning. Let's see how they have made the product and if you need extra mods in order to get it running (besides a remap off course)
We process personal data about users of our site, through the use of cookies and other technologies, to deliver our services, personalize advertising, and to analyze site activity. We may share certain information about our users with our advertising and analytics partners. For additional details, refer to our Privacy Policy.
By clicking "I AGREE" below, you agree to our Privacy Policy and our personal data processing and cookie practices as described therein. You also acknowledge that this forum may be hosted outside your country and you consent to the collection, storage, and processing of your data in the country where this forum is hosted.
Comment