84CUCV
3/4 ton status
i was told with the computer fi truck. i cant use this. so how can i use it? rework the computer or somethings?? any ideas?
thanks
thanks
CK5
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91 tbi 5.7 why cant i use a gear drive
- Thread starter 84CUCV
- Start date
IIRC it makes noise or vibration and the knock sensor thinks it's knocking, retards the timing, gets all screwed up.
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Jason4x4
1/2 ton status
What he said.dremu said:
y5mgisi
1 ton status
what they said.
Thunder
3/4 ton status
You can use a gear drive timing if you get a chip with the knock sensor deleted from the programing.
If you are building a high performance TBI engine you should delete the knock sensor anyhow.
If you are building a high performance TBI engine you should delete the knock sensor anyhow.
84CUCV
3/4 ton status
ok can i get ride of this knock sensor myslef? thanks
Jason4x4
1/2 ton status
no, the computer used it to adjust timing, if you got ride of it, it would probably ping alot.
resurrected_jimmy
1/2 ton status
84CUCV said:
you have to get the chip re-burned. I got mine from affordable fuel injection who is or used to be a vendor on here.
84CUCV
3/4 ton status
ok so this is ok to do or not ok to do?
Jason4x4
1/2 ton status
not ok if you just remove it, ok if you have the prom programed to work without it.
84CUCV
3/4 ton status
then it would ping you said?
84CUCV
3/4 ton status
unless i get the new puter? ok think i got it
Never mind.
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kwissman
1/2 ton status
I think he is talking about a gear drive for the timing.
If you do some reading about them they are not recommended by most drag racers due to harmonics problems transfering from the crank to the cam. There is no performance gain from a gear drive timing set.
If you just want the whine then that is up to you, but you will need to get a new prom for the ECM.
If you do some reading about them they are not recommended by most drag racers due to harmonics problems transfering from the crank to the cam. There is no performance gain from a gear drive timing set.
If you just want the whine then that is up to you, but you will need to get a new prom for the ECM.
84CUCV
3/4 ton status
ok so im worng. i thought there was a gain. ok thanks
GM used a BUNCH of different knock sensors, and while I couldn't find it, I know I saw threads on thirdgen discussing using gear drives. Some people were not having problems.
Besides using different knock sensors, GM also "deadened" some applications by mounting them on brackets off the engine.
As mentioned, you aren't going to see gains with timing gears, and even the stock nylon geared timing sets typically last as long as the engine, a solid metal double row/roller chain is probably at least twice as durable. (with as many nylon toothed setupsas are out there, if timing chains were a real problem, it would be the only reason GM engines died)
Besides using different knock sensors, GM also "deadened" some applications by mounting them on brackets off the engine.
As mentioned, you aren't going to see gains with timing gears, and even the stock nylon geared timing sets typically last as long as the engine, a solid metal double row/roller chain is probably at least twice as durable. (with as many nylon toothed setupsas are out there, if timing chains were a real problem, it would be the only reason GM engines died)
84CUCV
3/4 ton status
thanks
The noise and or harmonics of a gear drive is what the knock sensor will pick up and retard your timing. You can simply unplug the knock sensor wire and this will no longer happen. You do not need to have a new chip made without the knock sensor since nothing will happen anyways with the wire disconnected. It's a bad thing to do to delete the knock sensor since it actually helps you in case of engine ping going up hills or on heavy acceration.
84CUCV
3/4 ton status
ok got it thanks
At risk of going off topic, how do we know that the tune of all knock sensors is exactly what the gear drives give off?
I know the GM test given (at least in some GM manuals) is to smack the block with a hammer and watch the scanner for knock detection. That's a whole lot different than a gear drive setup making whining noises. (which understandably translates to harmonics of course)
Not saying one way or the other, I think there are too many variables out there to make a blanket statement on this is all. There just doesn't seem to be concrete info out there.
Still not a proponent of gear drives for street use, but that's not my call on someone elses rig.
I know the GM test given (at least in some GM manuals) is to smack the block with a hammer and watch the scanner for knock detection. That's a whole lot different than a gear drive setup making whining noises. (which understandably translates to harmonics of course)
Not saying one way or the other, I think there are too many variables out there to make a blanket statement on this is all. There just doesn't seem to be concrete info out there.
Still not a proponent of gear drives for street use, but that's not my call on someone elses rig.
