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Author
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Topic: Now question about the computer
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1988Stang
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Member # 6280
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posted
 
 
Is an 8LD computer any good or is it crap, becuase i have had a lot of fuel problems, not getting enough. Only getting good amount of fuel when motor is cold, not warmed up.
Posts: 161 | From: Petaluma | Registered: Dec 2005
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Blind
2.3L
CAFords OG
Member # 3052
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posted
8LD is speed density, that actually makes your car faster than a stock MAF computer car (A9L, etc)
speed density does not react well to mods that change the vacume though, so if you recently put a new cam in that would be your problem.
you may also have a vacume leak, that would make your car run lean.
and how do you know its running lean when warmed up? Did you check the plugs?
things I'd check:
vacume leaks
ECT/ACT sensors (coolant temp)
TPS, EGR, O2 sensors
How old is the thermostat? Might be time to put a new 195* stat in there.
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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1988Stang
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Member # 6280
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posted
my motor has new 10 to 1 compression pistons, E7TE heads ported and polished, E-cam, roller rockers, edelbrock intake, 70mm throttle body, 75mm Pro M mass air meter calibrated to the 30 pound Ford Racing injectors. If that computer is a speed density computer than why is it in my car if my car is set up as a mass-air?
Posts: 161 | From: Petaluma | Registered: Dec 2005
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silverLX
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Member # 3207
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posted
I have an extra A9S I believe, if you want to try it out and see if it helps, your welcome to. Let me know.
In case you don't know, Healdsburg is about 30 minutes from Petaluma...
[ December 12, 2005, 08:54 PM: Message edited by: silverLX ]
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88LX hatch 410w
88LX vert gears, exhaust
95GT H/C/I
Posts: 1613 | From: Sonoma County | Registered: Aug 2003
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1988Stang
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Member # 6280
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posted
something i forgot, the motor is all new with 600 miles on it, all the sensors are new too. It is a 306. It has a brand new 180* thermostat in it.
Posts: 161 | From: Petaluma | Registered: Dec 2005
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1988Stang
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Member # 6280
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posted
What is the difference between an A9S and a A9L, I was just in healdsburg today too. But if that would the motor run better i would like to try it, and give you some money for it if you no longer need it. Thanks
Posts: 161 | From: Petaluma | Registered: Dec 2005
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silverLX
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Member # 3207
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posted
Well if you want me to take a look at it, I might be able to help you out.
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88LX hatch 410w
88LX vert gears, exhaust
95GT H/C/I
Posts: 1613 | From: Sonoma County | Registered: Aug 2003
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1988Stang
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Member # 6280
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posted
Yeah that would be great, i sent you an e-mail, did you get it?
Posts: 161 | From: Petaluma | Registered: Dec 2005
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silverLX
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Member # 3207
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posted
Yes I got it.
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88LX hatch 410w
88LX vert gears, exhaust
95GT H/C/I
Posts: 1613 | From: Sonoma County | Registered: Aug 2003
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JohnB
Tech Moderator
Member # 969
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posted
I think the glaring question is why do you have a SD computer for a MAF setup? ![[Confused]](confused.gif)
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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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silverLX
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Member # 3207
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posted
If it actually is a speed density computer, its in an 88 California car with factory mass air for some reason. He bought the car bone stock and it ran perfect until he put the new motor in. If it was the wrong computer, it would have ran like shit before. I am going to give him a hand and hopefully figure it out.
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88LX hatch 410w
88LX vert gears, exhaust
95GT H/C/I
Posts: 1613 | From: Sonoma County | Registered: Aug 2003
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1988Stang
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Member # 6280
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posted
i think that is a great question. The guy i bought the car from (the origal owner) said that he never did anything to the computer or wiring, the car was all stock when i bought it. The weird thing is that my car is an 88 California, the first year of mass-air. Could that have anything to do with it?
Posts: 161 | From: Petaluma | Registered: Dec 2005
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JohnB
Tech Moderator
Member # 969
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posted
What version 8LD is it? There is more than one. If this is a Cali car, it is version 2...due to the MAF. If it just started with the engine change, I'd look at the obvious...
Fuel Pressure and MAF calibration.
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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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1988Stang
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Member # 6280
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posted
i have a pro M mass air calibrated for 30 pound injectors, and i have ford racing 30 pounds injectors. The car revs out at 5000 rpms at 40 psi fuel pressure, but when i bump it up to 50 psi the motor pulls hard to its rev limiter of 6200, but i shift at 6000.
Posts: 161 | From: Petaluma | Registered: Dec 2005
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JohnB
Tech Moderator
Member # 969
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posted
You're setting the fuel pressure with the vac disconnected and plugged, right?
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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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