Dara logging and tuning
Thread Starter
Instructor
Joined: May 2005
Posts: 193
Likes: 8
From: West Islip NY
Data logging and tuning
so i have been tuning and data logging my 89. I have been using
an ostrich 2 which is awesome. My BLM's were in the 150s, a new
friend I met from thirdgen.org suggested before I go in depth with
changes in the tune, to try changing size of injector size in the tune,
I changed it from 22.3 to 19 and BLM's are near perfect now at
128 to 130, car runs very well, I have some knock counts at 2800 rpm
to look into, question is should i leave this way or get into the maps
instead of leaving injector size changed,
also was suggested to go to a heated o2 sensor which i will do, and a
wide band o2 also.
chris
an ostrich 2 which is awesome. My BLM's were in the 150s, a new
friend I met from thirdgen.org suggested before I go in depth with
changes in the tune, to try changing size of injector size in the tune,
I changed it from 22.3 to 19 and BLM's are near perfect now at
128 to 130, car runs very well, I have some knock counts at 2800 rpm
to look into, question is should i leave this way or get into the maps
instead of leaving injector size changed,
also was suggested to go to a heated o2 sensor which i will do, and a
wide band o2 also.
chris
Last edited by zapc; Nov 9, 2016 at 08:26 PM.
Drifting
Joined: Dec 2012
Posts: 1,504
Likes: 73
From: Georgetown TX
I have 89 with same problem, so I will try this also. I also have ostrich 2. I was just thinking and I don't truely understand fuel trim, but if is high, don't you want more flow and not less, because ecm is adding more time to injectors because it's running lean. Am I all confused?
Last edited by mlm0; Nov 9, 2016 at 09:43 PM.
Safety Car
Joined: Sep 2001
Posts: 4,157
Likes: 554
From: Glenbeulah Wi
so i have been tuning and data logging my 89. I have been using
an ostrich 2 which is awesome. My BLM's were in the 150s, a new
friend I met from thirdgen.org suggested before I go in depth with
changes in the tune, to try changing size of injector size in the tune,
I changed it from 22.3 to 19 and BLM's are near perfect now at
128 to 130, car runs very well, I have some knock counts at 2800 rpm
to look into, question is should i leave this way or get into the maps
instead of leaving injector size changed,
also was suggested to go to a heated o2 sensor which i will do, and a
wide band o2 also.
chris
an ostrich 2 which is awesome. My BLM's were in the 150s, a new
friend I met from thirdgen.org suggested before I go in depth with
changes in the tune, to try changing size of injector size in the tune,
I changed it from 22.3 to 19 and BLM's are near perfect now at
128 to 130, car runs very well, I have some knock counts at 2800 rpm
to look into, question is should i leave this way or get into the maps
instead of leaving injector size changed,
also was suggested to go to a heated o2 sensor which i will do, and a
wide band o2 also.
chris
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
I have 89 with same problem, so I will try this also. I also have ostrich 2. I was just thinking and I don't truely understand fuel trim, but if is high, don't you want more flow and not less, because ecm is adding more time to injectors because it's running lean. Am I all confused?
By increasing the PW, more fuel is delivered which brings down the lean condition (from the 150's). As a result, less "trim" is needed to correct normal running conditions.
Brian is also saying you may not be as rich in open loop operation such as start-up and WOT operation -- where fueling is calculated based on static parameters. And, if they aren't "correct", you may not get the results/performance desired.
Fueling tables aren't that complicated. IIRC, target BLM is 128. If you see 150, Divide 150/128 = 1.17 Multiple that times the MAF table entry that corresponds to the MAF grams where 150 BLM is observed. In general, fueling should be smooth/linear from cell-to-cell -- which should also help build a new, closer table.
150 represents fuel being 17% low/lean. Notice the OP lowered the injector size by 17% in an attempt to accomplish the same thing.
Drifting
Joined: Dec 2012
Posts: 1,504
Likes: 73
From: Georgetown TX
Thanks for information
If you code a smaller-than-actual number for the injector size, the ECM thinks it needs more pulse-width to hit what's specified in the fueling tables. The battery voltage constant plays a part in this calculation too (as Brian posted above).
By increasing the PW, more fuel is delivered which brings down the lean condition (from the 150's). As a result, less "trim" is needed to correct normal running conditions.
Brian is also saying you may not be as rich in open loop operation such as start-up and WOT operation -- where fueling is calculated based on static parameters. And, if they aren't "correct", you may not get the results/performance desired.
Fueling tables aren't that complicated. IIRC, target BLM is 128. If you see 150, Divide 150/128 = 1.17 Multiple that times the MAF table entry that corresponds to the MAF grams where 150 BLM is observed. In general, fueling should be smooth/linear from cell-to-cell -- which should also help build a new, closer table.
150 represents fuel being 17% low/lean. Notice the OP lowered the injector size by 17% in an attempt to accomplish the same thing.
By increasing the PW, more fuel is delivered which brings down the lean condition (from the 150's). As a result, less "trim" is needed to correct normal running conditions.
Brian is also saying you may not be as rich in open loop operation such as start-up and WOT operation -- where fueling is calculated based on static parameters. And, if they aren't "correct", you may not get the results/performance desired.
Fueling tables aren't that complicated. IIRC, target BLM is 128. If you see 150, Divide 150/128 = 1.17 Multiple that times the MAF table entry that corresponds to the MAF grams where 150 BLM is observed. In general, fueling should be smooth/linear from cell-to-cell -- which should also help build a new, closer table.
150 represents fuel being 17% low/lean. Notice the OP lowered the injector size by 17% in an attempt to accomplish the same thing.
Thread Starter
Instructor
Joined: May 2005
Posts: 193
Likes: 8
From: West Islip NY
I forgot to mention in my original post that I have a Mini Ram
on the motor, that being the lean condition I'm sure, I'm getting ready
to do a cam which I'm sure will open up a new can of worms, as to part 2 of my question do you think the 3 wire 02 is necessary? I think it certainly will be when I do full length headers. If anyone is interested I will tell you that the miniram with no other mods at all made a huge huge difference in performance especially above 4000rpm
it pulls very hard to 6000 and more, cant wait to do cam and full length headers
on the motor, that being the lean condition I'm sure, I'm getting ready
to do a cam which I'm sure will open up a new can of worms, as to part 2 of my question do you think the 3 wire 02 is necessary? I think it certainly will be when I do full length headers. If anyone is interested I will tell you that the miniram with no other mods at all made a huge huge difference in performance especially above 4000rpm
it pulls very hard to 6000 and more, cant wait to do cam and full length headers
so i have been tuning and data logging my 89. I have been using
an ostrich 2 which is awesome. My BLM's were in the 150s, a new
friend I met from thirdgen.org suggested before I go in depth with
changes in the tune, to try changing size of injector size in the tune,
I changed it from 22.3 to 19 and BLM's are near perfect now at
128 to 130, car runs very well, I have some knock counts at 2800 rpm
to look into, question is should i leave this way or get into the maps
instead of leaving injector size changed,
also was suggested to go to a heated o2 sensor which i will do, and a
wide band o2 also.
chris
an ostrich 2 which is awesome. My BLM's were in the 150s, a new
friend I met from thirdgen.org suggested before I go in depth with
changes in the tune, to try changing size of injector size in the tune,
I changed it from 22.3 to 19 and BLM's are near perfect now at
128 to 130, car runs very well, I have some knock counts at 2800 rpm
to look into, question is should i leave this way or get into the maps
instead of leaving injector size changed,
also was suggested to go to a heated o2 sensor which i will do, and a
wide band o2 also.
chris
Thread Starter
Instructor
Joined: May 2005
Posts: 193
Likes: 8
From: West Islip NY
Wide band o2
so I am continuing my learning of trying to tune, thinking I am ready to buy a wide band o2 gauge, some datalog and some do not I see, has anyone got tuner pro to monitor a wideband in addition to the stock o2? can it be done? what gauge is the recommended? everyone has their preference im sure but when I buy something I usually get the oh you should have bought this one instead routine. so whats everyone recommend? and if im not going to get it to work with tuner pro do I need a data logging one at all? also im confused about the data that tunerpro does log seems like its dependant on the particular
ADX file you use? windata seems to monitor so much more than tunerpro for me, so ive been using windata to datalog and tunerpro to edit and upload to the ostrich
thanks
ADX file you use? windata seems to monitor so much more than tunerpro for me, so ive been using windata to datalog and tunerpro to edit and upload to the ostrich
thanks
I forgot to mention in my original post that I have a Mini Ram
on the motor, that being the lean condition I'm sure, I'm getting ready
to do a cam which I'm sure will open up a new can of worms, as to part 2 of my question do you think the 3 wire 02 is necessary? I think it certainly will be when I do full length headers. If anyone is interested I will tell you that the miniram with no other mods at all made a huge huge difference in performance especially above 4000rpm
it pulls very hard to 6000 and more, cant wait to do cam and full length headers
on the motor, that being the lean condition I'm sure, I'm getting ready
to do a cam which I'm sure will open up a new can of worms, as to part 2 of my question do you think the 3 wire 02 is necessary? I think it certainly will be when I do full length headers. If anyone is interested I will tell you that the miniram with no other mods at all made a huge huge difference in performance especially above 4000rpm
it pulls very hard to 6000 and more, cant wait to do cam and full length headers
