UrS4 tuning success story - Part Two
bobby at lightedge.co.za
Mon Jan 20 07:09:18 EST 2003
Just a short note to re-enforce Mihnea's pride.....
I am the owner of a '94 S4 and live in Cape Town. (that's right at the
southern tip of Africa). I fitted a RS2 turbo about a year ago when the
stock unit failed and nobody down here has been able to sort out the ECU
maps for this.
Not only has Mihnea sorted out the fuel and boost maps. But he has also
safely extracted a lot more power and torque. The car is totally
transformed and is now a pleasure to drive. All of this was done via
email (with me doing the EPROM burning and erasing) and Mihnea was able
to predict how the engine was going to respond without even driving the
He is a professional and a true enthusiast and I recommend him for any
ECU changes required to your car. He is one of the very few who knows
his stuff and it was the best money that I have ever spent on my S4.
Bobby Richter (Technical Manager)
Light Edge Technology (Pty) Ltd.
Tel: +27 21 5108270 (Ext. 261)
Fax: +27 21 5108240
From: Mihnea Cotet [mailto:mik at info.fundp.ac.be]
Sent: 19 January 2003 10:24 PM
To: quattro at audifans.com; 200q20v at audifans.com
Subject: UrS4 tuning success story
I just wanted to vent my happiness for what happened yesterday with a
He had some chips in it with a 3 Bar MAP sensor, but he couldn't get
boost from the engine without having and hearing knocking...
So yesterday I went to his place with all my equipment and tested the
no fault codes, everything perfect. We then test drove it and got no
at boost pressures lower than 1.5 Bar (2.5 absolute). Then we turned the
spring down 2 turns, went for a drive and wow! I've gotten to hear knock
for the first time in my life, and hell it doesn't sound good or
reassuring! Then I opened his ECU, pulled the chips, read them and
working on the maps inside. And there was the surprise! His chips
was made for an enormous turbocharger, RS2 injectors and a huge
as well, plus probably some very high octane fuel. 27 degrees advance at
WOT/7000 RPM and a little lower than that at lower RPMs/WOT... Man,
the dumba$$ who did those chips??? The timing advance map for
knocking" was only 3 degrees retarded from the main map, so no wonder we
could hear knock!
So I set off to work and modify his ignition advance map, then added a
little more fuel, and meanwhile he installed a set of 3B injectors,
retaining the stock UrS4 fuel pressure regulator, so he could have a
more fuel in order to protect his engine and get a few more horses out
it. Then we burnt the chips, and went for the test drive that was going
reveal if I knew what I was doing or not (though my friend didn't have a
doubt that I knew it). Well, at 1.6 Bar, the result is blasting! Whereas
before he used to have a nasty "flat spot" between 2 and 3k RPM at WOT
not get proper boost below 3300 RPM (we measured 0.8 Bar at 3000 during
first test drive), he now has 1.35 Bar at 2800 RPM and 1.6 at 3100 or
thereabouts. The car now pulls strongly to the redline with no signs of
ECU backing off the advance at whatever RPM and no more flat spot
About 2 hours later when I was almost at home, he called me from Paris
(which is some 400 km away from his place BTW) to thank me again for the
good work and to tell me that his car never pulled so strongly as now!!!
guess he slightly ignored the speed limits in order to get to Paris in
a short time but oh well...
Sorry for the long post but I needed to somehow vent my pride! :-)
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