A mate just fitted a CA18det into an MGF using a microtech which gives a numerical read out of the A/F ratio and will also data log the figures.He also had a jaycar type led meter both of which use narrow band sensors.Before we started tuning we calibated it against his $10,000 workshop CO tester.We simply held the motor at a constant rpm and adjusted the injector pulse width up and down the scale and compared the numbers/lights so we knew where we were.The numbers on the microtech were very accurate and after some adjusting of the pot the jaycar sat smack in the middle while the others were on 14.7.We then did a few hours of road tuning getting things right.With the data logging you can check out any to rich and to lean spots compare them to the map/rpm and adjust accordingly.The full boost runs were checking out well so it was time to hit the dyno for some fine tuning for max torque.With the wide band ntk sensor in place everything checked out the same as the microtech a/f readings.Dyno time was 1 hour and cost $70.The little beast made 214rwhp running 10-12 psi.The injector duty cycle was nearly maxing out otherwise we would have put more boost into it.The first run on the dyno with only street tuning we got 209rwhp.The only mods to the motor was a t25g turbo with a hiflow t28 wheel and 20b intercooler.The mg nuts nearly have a heart attack when they see a nissan motor in an mg.Sorry to ramble on.
Daniel Kroehn wrote: > As far as I've been told, they are more of a gimmick than an accurate tool. > My mate has the Jaycar kit. Not the LED one, its the one that actually > displays the air/fuel ratio as a number. He hooked it up to his O2 sensor. > This step is important: You then must have it calibrated against a > professional air/fuel ratio meter. Once this is done it works really well. > It is just as accurate the professional machines for a fraction of the cost. > But as I said only if you have it calibrated against a professional meter. > > cheers > > Daniel Kroehn > > ----- Original Message ----- > From: "James Fitness" <[EMAIL PROTECTED]> > To: "membersozdat" <[EMAIL PROTECTED]> > Sent: Friday, July 26, 2002 10:31 PM > Subject: air fuel ratio meters > > > Hi All > > > > further to our discussion the other week about air fuel ratio meters.. > > I noticed this in the latest Autobarn sale catalog > > > > Auto Meter air fuel ratio meter > > Part No. AU3375 @$ 137 > > So I looked it up on the Auto Meter website and came > > up with the following page:- > > http://www.autometer.com/hp/2001_catalog/competition/46.html > > > > Apparently it works with most O2 sensors, but they also sell a > > Oxygen Sensor Kit (includes sensor,weather pack harness, > > and weld fitting). > > no idea of the price of the O2 sensor kit as yet, but I will find out... > > > > There is also a bit of a page explaining it further in their Tech > > Tips/FAQ Pages. > > titled - "Air/Fuel Ratio gauges and Oxygen Sensor operation explained." > > > > > > could be worth a further look at that price.... > > anybody tried one of these (autometer ones) ?? > > > > cya > > James > > > > > > -- > > ________________________________________________________________________ > > > > James Fitness > > Director > > Data Scribe Australia Pty Ltd > > http://www.datascribe.com.au > > Computers and Supplies > > > > OZDAT Online > > http://www.ozdat.com/ozdatonline/index.htm > > > > > --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[email protected]/ ---------------------------------------------------------------------
