Re: tuning micotech digi one fuel only..

[CM510]

Hi guys,   I wouldn't get to excited about the Jaycar A/F meter (or any others for that matter) unless you look at investing $200+ on a top quality 'Wide Band' O2 sensor.  The meters them selves are quite good (I have one myself)...BUT they are very limited in the A/F ratio they can indicate due to the limits of most O2 sensors.   Most common O2 sensors (all nissan included) only give an ouput voltage between 0 and 1volt, where 0 = 14:1 a/f and 1v = 15:1 a/f (approx)   This means that the meter can only show A/F ratio's between 14 and 15:1.....This is pretty nigh on useless for other than making sure 'cruise' mixtures (stoich 14.7) are right.   If under load and you get as lean as a 14:1 A/F, any highly strung motor will be less a piston anyway.   Cam (the guy who bought the kit and found out it's limitations later :(( )     CM510 www.datnet.org/cm510 ----- Original Message ----- From: Mark Alford To: Ozdat discussion list Sent: Thursday, October 04, 2001 5:03 PM Subject: Re: tuning micotech digi one fuel only.. Mark,   The air/fuel ratio meter from Jaycar works really well. I made one about three years ago for a GSR lancer turbo. It is very simple to build (only took around 45mins) and have very little experience with electronics. I used mine in conjunction with an injector duty cycle meter.   Calibration is pretty straight forward on a standard engine, but if the engine is modified in any way, then it really need to be done while hooked up to some type of emmissions machine, like most mechanics use.   They are a great tool to keep an eye on what's happening under the bonnet. I noticed that once I wound the boost up the duty cycle of the injectors would peak out and at the same time the air mixtures would start to go lean. This only started to happen though when I pushed the car to 16psi (a 60% increase). This can be very handy when running in different air temps - if the engine is at the limit.   Good luck.   Mark A.   ----- Original Message ----- From: steven.taylor To: [EMAIL PROTECTED] Sent: Thursday, October 04, 2001 4:52 AM Subject: Re: tuning micotech digi one fuel only.. Mark, Last time i had mine on the dyno it made 149kw@wheels@16psi. This was with my new throttle body, fuel rail, Malpassi rising reg., and ca18det injectors. The tune is still on - 35% total mixture trim - so there is still shiteloads of fuel left. Therefore ca18 or fj20 injectors will be fine! If your going to adelaide anyways why not get it dynoed again then?? Plus its gunna cost your at least 100 bucks to make your air/fuel ratio, then theres the fact that you dont know what your doing. thats why i always just take mine and get it re-dynoed by professionals - then i know everything is 100%!! Yeah i read about your head bolts - no good! It was giving me the shits and i heard a hell of a lot of bad stuff about copper head gaskets from a variety of different people. I ended up putting a stocky gasket back in, its been going now sweet as for a week and with the o-rings in the head locking everything in it should be well and truly strong enough - plus it doesnt leak!! Steve.   mark krawczuk wrote:  hi,  there is a air/fuel ratio meter  available in a kit form , from jaycar electronics and also dick smiths (i think). the design comes from "silicon chip magazine"  its a electronic hobbyist magazine, i reckon that i still have some data some where for the kit. it costs about 60-70 dollars  for the kit, but has to be calibrated , i think that there is some calibration that can be done  , depending on the characteristics of the o2 sensor. with out using a proper a/f meter.   but it would pay to get it properly calibrated  at a garage etc...  i think that this would help out alot using this meter , i will definately be getting one , ( i should be going to adelaide next week, so i`ll get a kit then)  i am using mercedes injectors( green) , and going by what the  guy said at rpm in adelaide , they are runningat a high (?) rate and might pay to go to higher flow.   i am getting 114kw at wheels, with a slipping clutch (new clutch should be here soon). he said if i wind the boost upand bigger injectors, i should be seeing about 150 kw at wheels. what sort of injectors would u use to get this  150 kw? i am tidying  up the engine bay at the moment , so it would be about a week or so till its finished.  did you read my messages about  the head bolt thread stripped? thats roughly where the water was leaking,, but it titened down alright in the first place? but what i cant figure iis that yours was leaking in the same place....                seeya later, mark -----Original Message----- From: steven.taylor <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] <[EMAIL PROTECTED]> Date: Wednesday, October 03, 2001 8:02 PM Subject: Re: tuning micotech digi one fuel only..  Mark, Hard question to answer mate as you will really need some sortof an airfuel ratio to get your mixtures 100%. As for how they work yeah i should be able to answer anything you need to know. When i upgraded my standard z18 injectors to ca18det ones i had to cut the MIX trim to -35% just to get it to idle and run. Its a pretty basicly setup computer thou and i have a manual if you wanna know anything. What kindof injectors you gunna use?? Steve.   mark krawczuk wrote:   -----hi, curious to know, does any body out there know how to tune up the microtech digi one fuel only computer? i was thinking of putting bigger injectors in it later on, and i dont really wanna drag it another 500 km (round trip, to adelaide) to get it done...        thanks, mark krawczuk --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/membersozdat@datascribe.com.au/ --------------------------------------------------------------------- --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/membersozdat@datascribe.com.au/ --------------------------------------------------------------------- --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/membersozdat@datascribe.com.au/ --------------------------------------------------------------------- --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/membersozdat@datascribe.com.au/ --------------------------------------------------------------------- --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/membersozdat@datascribe.com.au/ --------------------------------------------------------------------- --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/membersozdat@datascribe.com.au/ ---------------------------------------------------------------------