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| 4.9 converted to OBD2, Megasquirt...has anyone done this? (Page 2/2) |
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Dennis LaGrua
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JUL 05, 08:07 PM
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I was there back then, and always saw Jon at the shows. I spoke with Jon about his projects, heard Jons engine but not Petes and that's what base my comments on. If you want to give up the IAC and you are a master ECM tuner you might make anything work with just about anything else. I believe that Pete may have used the 7730 because there was a split timing table available for running boost and his car was mainly for strip. . I'd sure like to see what these 7730 tunes do at the strip in ET's or on the dyno as compared to running the identical engine with the stock Caddy ECM. Horsepower is simply made with how we control fuel, air and spark. The 740 is tunable just like the 7730 is.
In closing we must remember, Forums are for the free and open exchage of ideas and opinions and I just expressed mine about a technical issue. Sadly some people are happier talking about people. ------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "
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CaptainHindsight
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JUL 06, 01:30 PM
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https://rusefi.com/
rusEFI can handle the IAC if you want to keep it. It's all open source, so if you have coding skills you can control just about anything.
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Will
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JUL 06, 05:52 PM
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| quote | Originally posted by CaptainHindsight:
https://rusefi.com/
rusEFI can handle the IAC if you want to keep it. It's all open source, so if you have coding skills you can control just about anything. |
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Dennis doesn't know the difference between an ISM and an IAC. IAC is a stepper motor. ISM, AIUI works via PWM pushing against the throttle spring. I think GM used the ISM on Cadillacs because by operating on the main throttle blade it theoretically has greater control authority than an IAC and can more completely overcome sudden increases in load from the alternator... e.g. everyone turns their seat heaters on at once and the idle dips less.
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pmbrunelle
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JUL 06, 07:21 PM
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I thought that an engine swap was more about getting the block, crankshaft, and heads you wanted.
The peripherals are a sort of non-issue that you're likely to change/adapt when you install the engine in your car.
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fierobear
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JUL 08, 09:31 AM
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| quote | Originally posted by pmbrunelle:
I thought that an engine swap was more about getting the block, crankshaft, and heads you wanted.
The peripherals are a sort of non-issue that you're likely to change/adapt when you install the engine in your car. |
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The reason why I asked about OBD-II is that part of the engine swap project is doing an electronic dash/instrument panel. VERY easy to do with OBD-II, a straight up pain in the ass with OBD-I. Possible, but a lot more work on a gee-whizzy part of the project. Better engine tuning would be a benefit, however.
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Warlordsix
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OCT 05, 10:47 PM
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| quote | Originally posted by Johns 4.9:
Hi,
I have a FAST TPI retro fit kit on my 4.9 engine. It uses a custom plenum, an LS throttle body and sensors mounted on an Allante lower intake manifold. Fuel injectors are EV6, 12 hole 24 lb injectors. Uses a wide band o2 sensor mounted to one side of an 180 degree headers and dual exhaust system. The ecm is self learning after a few basic inputs. Quick throttle response, good idle and easy start up. Runs great!
Cheers
John
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The FAST Retro system is what I've been planning to use for my next 4.9 Fiero swap. Seems straight forward, but I'm very interested in hearing your thoughts and lessons-learned with it.
thanks.
Ernie------------------
'87 Fiero 4.9 5-speed
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Dennis LaGrua
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OCT 07, 11:04 AM
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| quote | Originally posted by Will:
Dennis doesn't know the difference between an ISM and an IAC. IAC is a stepper motor. ISM, AIUI works via PWM pushing against the throttle spring. I think GM used the ISM on Cadillacs because by operating on the main throttle blade it theoretically has greater control authority than an IAC and can more completely overcome sudden increases in load from the alternator... e.g. everyone turns their seat heaters on at once and the idle dips less. |
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Nomenclature doesn't always indicate what a person knows. As a graduate electronic engineer I am very familiar with all types of motors and electronics controls. I am quite familiar with programming, interfaces, I/O have completed 5 engine swaps and do all of my own ECM/PCM tuning. I say again anyone who decides to talk about another forum member is someone severely lacking in character and a total jerk. People need to show off their work and achievements not just shoot their mouth off.
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Johns 4.9
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OCT 07, 02:38 PM
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I agree with you, Dennis. That's why I don't post anymore.
Cheers
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