85 Open Loop Tuning
Thread Starter
Le Mans Master
Joined: Jul 2001
Posts: 6,252
Likes: 2
From: Silicon Valley Kalifornia
85 Open Loop Tuning
Which tables in TunerCATS allow this modification? I've searched in the app and cannot decipher which ones are responsible. Any input approciated.
Burning Brakes
Joined: Apr 2002
Posts: 1,083
Likes: 0
From: Spanish Fork Utah
Originally Posted by GRX
Which tables in TunerCATS allow this modification? I've searched in the app and cannot decipher which ones are responsible. Any input approciated.
I thought you had already done the 870 to 165 switch. I'm thinking about doing it soon. I have all the hardware, minus one relay. Wish I could help you here.
Shayne
Thread Starter
Le Mans Master
Joined: Jul 2001
Posts: 6,252
Likes: 2
From: Silicon Valley Kalifornia
Originally Posted by sspackman
Hey GRX,
I thought you had already done the 870 to 165 switch. I'm thinking about doing it soon. I have all the hardware, minus one relay. Wish I could help you here.
Shayne
I thought you had already done the 870 to 165 switch. I'm thinking about doing it soon. I have all the hardware, minus one relay. Wish I could help you here.
Shayne
I've read up on it in the past. Shouldn't be too hard.
Burning Brakes
Joined: Apr 2002
Posts: 1,083
Likes: 0
From: Spanish Fork Utah
Originally Posted by GRX
Thanks Shayne; According to Morley, our 85 ECM is 'non-adjustable' when it comes to OPEN LOOP or WOT. I am considering the ECM swap.
I've read up on it in the past. Shouldn't be too hard.
I've read up on it in the past. Shouldn't be too hard.
http://forums.corvetteforum.com/show....php?t=1034900
So the question remains. Will you get a better tune because the 165 ECM is 13 1/2 times faster than the 870? Jesse, is it easier for you to tune a 165 than an 870? (now forwarding link to Jesse)
Thread Starter
Le Mans Master
Joined: Jul 2001
Posts: 6,252
Likes: 2
From: Silicon Valley Kalifornia
Drifting
Joined: May 2003
Posts: 1,730
Likes: 1
From: Charlotte NC
St. Jude Donor '05
%Change to Fuel/Air Ratio At WOT Vs. Coolant Temp.
%Change To Fuel/Air Ratio At WOT Vs. RPM
%Change To Fuel/Air Ratio Vs. Coolant (Open Loop)
%Change To Fuel/Air Ratio Vs. Load, (Open Loop)
Thats all taken from the 85 ECM definition.
Lets not forget what the true meaning of open loop is.. (No feedback from O2 sensors) Theres a much better way of doing that than just setting min temp for closed loop and settings such as that because often open loop adds enrichments because it assumes that its cold, just cranked, etc.
%Change To Fuel/Air Ratio At WOT Vs. RPM
%Change To Fuel/Air Ratio Vs. Coolant (Open Loop)
%Change To Fuel/Air Ratio Vs. Load, (Open Loop)
Thats all taken from the 85 ECM definition.
Lets not forget what the true meaning of open loop is.. (No feedback from O2 sensors) Theres a much better way of doing that than just setting min temp for closed loop and settings such as that because often open loop adds enrichments because it assumes that its cold, just cranked, etc.
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Drifting
Joined: May 2003
Posts: 1,730
Likes: 1
From: Charlotte NC
St. Jude Donor '05
Originally Posted by GRX
Alvin, WOT and open loop can be controlled with JUST these tables?
You can do ALOT of things with those tables along with other tables in the car.
What problems are you having with the car now?
The computer is not as bad as everyone makes it out to be. I did one on the dyno with a nice mild cam and a mini ram. It literallly took just a few pulls to get it in nicely.
The only thing thats a pain is the datalogging. Its pretty slow.
Last edited by Alvin; Apr 5, 2005 at 01:10 AM.
Drifting
Joined: Mar 2005
Posts: 1,923
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From: GA
I did the 870-165 swap and never had any regrets. The 165 with my "modded" ARAP bin runs the car better than the 870 ever did, even when new.
Yes there is a lot of "other" info in the 165 bins...but no one says you have to fiddle with any of it. I would never even think of going back to the 870 (just my personal view)
Yes there is a lot of "other" info in the 165 bins...but no one says you have to fiddle with any of it. I would never even think of going back to the 870 (just my personal view)
Drifting
Joined: Apr 2003
Posts: 1,379
Likes: 4
From: rome ny
i know on my 730 ecm open loop can be adjusted in the ve tables.. it is my understanding that the ve tables have a direct effect on open and closed loop.
also the tables that alvin metioned should help..
also the tables that alvin metioned should help..
Thread Starter
Le Mans Master
Joined: Jul 2001
Posts: 6,252
Likes: 2
From: Silicon Valley Kalifornia
Originally Posted by Alvin
Where is your wideband at?
Usually the cars run richer in open then fall leaner in closed.
Usually the cars run richer in open then fall leaner in closed.
Thread Starter
Le Mans Master
Joined: Jul 2001
Posts: 6,252
Likes: 2
From: Silicon Valley Kalifornia
Originally Posted by Alvin
Also, have you checked the BLM's with a scanner.. what are they saying?
Thread Starter
Le Mans Master
Joined: Jul 2001
Posts: 6,252
Likes: 2
From: Silicon Valley Kalifornia
Originally Posted by Morley
I did the 870-165 swap and never had any regrets. The 165 with my "modded" ARAP bin runs the car better than the 870 ever did, even when new.
Yes there is a lot of "other" info in the 165 bins...but no one says you have to fiddle with any of it. I would never even think of going back to the 870 (just my personal view)
Yes there is a lot of "other" info in the 165 bins...but no one says you have to fiddle with any of it. I would never even think of going back to the 870 (just my personal view)
Drifting
Joined: May 2003
Posts: 1,730
Likes: 1
From: Charlotte NC
St. Jude Donor '05
It sounds to me like the car is lean, blm's are able to catch the car back up when you go into closed loop. Why not bump up the fuel gloabally and see where that takes you?
A ECM swap isn't gonig to cure a tuning problem. Eventually you'll have to tackle tuning it.. Might as well get your moneys worth out of the 870
If i was you too, i would swap all the way up to a 730 when you finally do swap. It will be a bit harder to tune, but its way more flexable.
A ECM swap isn't gonig to cure a tuning problem. Eventually you'll have to tackle tuning it.. Might as well get your moneys worth out of the 870
If i was you too, i would swap all the way up to a 730 when you finally do swap. It will be a bit harder to tune, but its way more flexable.