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There should be a flag for speed density enable to turn off maf
Not seeing it.
This mask doesn't have an AE mode. Quite strange.
I'm not planning on camming the motor or anything, I was just curious how the fuel calculations work on it. The MAF sensor reads up to 424 grams/sec which isn't too terrible.
Found some of my own posts from 2006 which was the last time I tuned one of these LT1 Vettes. Man I've long since forgot. I gotta find one of my old tuning notebooks
I'll have to see what mask files i have because the last one i did had a switch/flag for the sd mode
It was a 94-95 lt1 in a thirdgen but motor was out of a vette as the 96-97 were obd2
I could have sworn there was a switch for "speed density fueling" but all the vette guys on the forum maintain it's MAF load primary and use speed density as backup.
I was just curious anyway. I'm not putting a cam or anything in it. I just did an EGR and air delete so I'll set those features off, maybe change the fan temps, etc.
Yes its maf but you CAN disable it in the definition file, or atleast it uses speed density as primary fueling
There is a long thread on this I found. The disable you are referring to does in fact disable the MAF and the DTC code when the maf is unplugged, and it will run/limp on speed density but it will be missing AE and some other features that require MAF.
Well i dont see any ae tables or scalars anywhere so maybe the maf does do it. It doesnt say in the mask notes i have
Yup. I'm positive. No TPS based AE that I could find, and these people have been hacking $EE for 20 years now so I figure they know whats up.
I'm on the fence as far as if I'd use it for performance use, but for a stock car it's not terrible. Closed loop correction for each bank, SFI with cylinder trims, and of course full electronic transmission control.
I've worked on several LT-1 Camaro's with Vortech and ATI superchargers running up to about 15psi and those computers did a real good job with just minor tuning.
I've worked on several LT-1 Camaro's with Vortech and ATI superchargers running up to about 15psi and those computers did a real good job with just minor tuning.
The ECU is limited to 512 grams/sec, how are you providing fuel above that ? Are you just maxing out the "% change to afr at wot" ?
Well its been 16 years since I touched one, but as I recall they were doing things to trick the computer.
Like running a higher flow MAF and just re-scaling some of the tables (dont recall exactly which ones now).
Also running a MAF translator. I know its a band-aid sort of thing but in 2001 the options were a lot more limited.
I also seem to remember things like rising rate FPR's
I dont recall those extreme external tricks being very necessary on NA LT-1 engines. I was just mentioning the boosted ones as an example of how far you might go with an $EE based setup.
Well its been 16 years since I touched one, but as I recall they were doing things to trick the computer.
Like running a higher flow MAF and just re-scaling some of the tables (dont recall exactly which ones now).
Also running a MAF translator. I know its a band-aid sort of thing but in 2001 the options were a lot more limited.
I also seem to remember things like rising rate FPR's
I dont recall those extreme external tricks being very necessary on NA LT-1 engines. I was just mentioning the boosted ones as an example of how far you might go with an $EE based setup.
You know what is amazing to me, after all these years nobody has figured a way to either flash the CCM on these cars, or simply replace it with an ardruino or something like that.
I disabled ASR on my tune, but didn't realize the CCM on the y-body also controls ASR so now I'm stuck with an intermittent flashing 'sys' light.
You know what is amazing to me, after all these years nobody has figured a way to either flash the CCM on these cars, or simply replace it with an ardruino or something like that.
-- Joe
Dang, I'm working on some LCD graphics displays for gauges right now and part of this project is to make a sort of body control module using an arduino mega board. Its a long ways away from realization, but yes the idea has come up and is being actively perused (at a very slow pace). Although my design is all intended to be standalone and not intended to interface with the OEM control modules.
Last edited by The_Punisher454; 11-15-2016 at 03:21 AM.
Dang, I'm working on some LCD graphics displays for gauges right now and part of this project is to make a sort of body control module using an arduino mega board. Its a long ways away from realization, but yes the idea has come up and is being actively perused (at a very slow pace). Although my design is all intended to be standalone and not intended to interface with the OEM control modules.
I'd pay a decent amount of money for a programmable CCM. This is the 1 design flaw with the Corvettes in my opinion. Once these things die, you can buy the car for almost nothing. Obviously the power locks, interior lighting, starter enable, chime, etc could all be re-wired but having no speedometer/odometer sucks big time.
The thing I working on is not vehicle specific, its just a universal body controller type thing. It will interface with the gauges I'm working on and has a bunch of analog and digital I/O. But it will do things like windows, locks, lights, climate control, alarm and such. A programmable speedo interface would be really easy as well.
Anyhow I have several projects in the works that will have to come first. But this one is in going to happen.
The thing I working on is not vehicle specific, its just a universal body controller type thing. It will interface with the gauges I'm working on and has a bunch of analog and digital I/O. But it will do things like windows, locks, lights, climate control, alarm and such. A programmable speedo interface would be really easy as well.
Anyhow I have several projects in the works that will have to come first. But this one is in going to happen.
If it could control the speedometer LCD on a 90-96 vette, and show odometer that would be fantastic. That's the biggest problem.
It would have to handshake with the ECM though, to get the VSS data.
I have an 84 vette with several issues in the stock instrument cluster. When I get a little farther along on the LCD gauges for my 2nd gen bird, I'm going to spin off a version of the display units for the vette, for a drop in replacement of the circuit board and LCD's. How are the 90-96 units different from the early C4's?. (I'm just barely starting to look into the vette dash right now)
I have an 84 vette with several issues in the stock instrument cluster. When I get a little farther along on the LCD gauges for my 2nd gen bird, I'm going to spin off a version of the display units for the vette, for a drop in replacement of the circuit board and LCD's. How are the 90-96 units different from the early C4's?. (I'm just barely starting to look into the vette dash right now)
The cluster on the '84 is mainly independent of the CCM.
On the '90-96, the gauges are mainly analogue except for this little square LCD in the center, which happens to be the speedometer, odometer, fuel gauge, range, and other things.
If I was a bad *** coder I'd try to hack the ccm. But I'm not. So My method would to be to just program an arduino and color LCD to fully replace that center display unit. I'd just pipe in the raw sensor data to the Arduino and bypass the CCM altogether.
Thats my way, based mostly on the limits of my skills.
Here is a work in progress on one of my 74 Firebird gauges. I'm doing this in a modular fashion so that I can easily port to other display's and show different parameters. This Tach screen will have 2 smaller gauges in the upper corners with a 90 degree sweep.
I'll show the gauge readings in numeric form also. For example the tach will show the RPM's in large digits right below the needle. This is a 7" display (barely fits the height of the 2nd gen bird inst panel), I have smaller displays also. And I can very easily (and very inexpensively) do touch screen as well. In fact touch screen is easier to program and less costly than physical buttons.
I also have a 3" display in the works that serves a similar function to the one on the Vette you showed. It shows info about the headlights, blinkers, gear position, TCC, OD, and much more. It also can show scrolling text along the bottom if I want to show some type of info.The 3" will be placed in portrait mode right above the column between the tach and speedo displays. I have one more 7" in the firebird that will be to the right of the dual 7" tach and speedo (where the heater controls used to be) that is touch enabled and can show any and all sensor data I have wired up to it (16 analog inputs and expandable to more if I need to). I will have multiple display pages on this one, some of them set up to drill down into small details. Ridiculous amounts of real time analysis based on comparing multiple sensors is possible.
Anyhow, here is a work in progress picture of the tach I took about 10 months ago.
The project is currently paused until I get a couple of my more urgent projects wrapped up first. I probably will be working on it again before new years.
11-10-2016, 07:33 PM
