Prom values
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From: Texas
Car: 1992 Formula Firebird
Engine: 305CID (LB9)
Transmission: World Class T5
Axle/Gears: 10-bolt, 4.10 gears
Prom values
A friend of mine has the programming software and hardware to make roms. He's going to let me bring him a blank rom and program it myself. However I am new to this stuff so here's the question. What are the values I should set it for. Fuel economy means nothing to me as it is not something I drive every day. I mostly want good quarter mile times. My car is an 87 Trans-AM 305 TPI car. Now the guy that has the programming stuff has a different car. I am not sure he will know what values to set. Any help here would be appreciated.
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From: Manassas VA
Car: 04 GTO
Engine: LS1
Transmission: M12 T56
roflmao, what values to set? It doesn't quite work like that holmes.
You 'set' the PROM using a bin editor like tunercat or winbin. In the editing software you have flags (for things like turning off trouble codes, setting manual/auto tranny, etc), constants (fan turn on temps, injector size, cyl size for SD, etc) and tables (timg vs. load vs. rpm. fuel vs. load vs. rpm, pe fuel vs. rpm, etc)
Some of those things you 'set' when you need to adjust for changes in the combo (manual tranny swap, changing injectors, deleting EGR, etc) Other things you set by tuning (fuel and spark curves)
But there is not a blueprint for what to do to get more performance. Honestly, if you have to ask such a question, i'd recomend you stay far far away from messing with your chip. Not that chipping is in any way difficult. Just that if you have absolutely no idea what you are looking at, then you have no business trying to change it. You modfy your bin to achieve certain goals. 'more performance' is not a goal if thats all you are using to define the term.
btw, with the right chip you will get max performance, driveability, efficiency and cleanest emmisions all in the same package. Thats why burning chips is such a great advance for these cars. Trying to trick the computer to get max perfomance is what costs you in other areas. Doing it in the chip lets everything work exactly as designed, which is to get the best of everything at every engine speed and load....
You 'set' the PROM using a bin editor like tunercat or winbin. In the editing software you have flags (for things like turning off trouble codes, setting manual/auto tranny, etc), constants (fan turn on temps, injector size, cyl size for SD, etc) and tables (timg vs. load vs. rpm. fuel vs. load vs. rpm, pe fuel vs. rpm, etc)
Some of those things you 'set' when you need to adjust for changes in the combo (manual tranny swap, changing injectors, deleting EGR, etc) Other things you set by tuning (fuel and spark curves)
But there is not a blueprint for what to do to get more performance. Honestly, if you have to ask such a question, i'd recomend you stay far far away from messing with your chip. Not that chipping is in any way difficult. Just that if you have absolutely no idea what you are looking at, then you have no business trying to change it. You modfy your bin to achieve certain goals. 'more performance' is not a goal if thats all you are using to define the term.
btw, with the right chip you will get max performance, driveability, efficiency and cleanest emmisions all in the same package. Thats why burning chips is such a great advance for these cars. Trying to trick the computer to get max perfomance is what costs you in other areas. Doing it in the chip lets everything work exactly as designed, which is to get the best of everything at every engine speed and load....
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From: Orygun
Maximum performance comes with maximum volumentric efficiency like ED is illuding too.. So if you burn a chip and your mileage goes way down you can assume you've screwed up.
The engine is the same it has always beein, the nearly 50 year old SBC has always had two things to tweak, timing and air/fuel ratio, try to get the A/F ratio to stoich, and from there adjust your timing untill you're just shy of knock by about 2° at all loads, then from there decrease timing untill performance decreases, back up a step, and call it good.
It takes a whole lot of time effort and scanning, dont think anything impressive is going to happen with one chip unless you're really excited about making that EGR code go away
The engine is the same it has always beein, the nearly 50 year old SBC has always had two things to tweak, timing and air/fuel ratio, try to get the A/F ratio to stoich, and from there adjust your timing untill you're just shy of knock by about 2° at all loads, then from there decrease timing untill performance decreases, back up a step, and call it good.
It takes a whole lot of time effort and scanning, dont think anything impressive is going to happen with one chip unless you're really excited about making that EGR code go away
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