hotwiring ksb = smoother idle?

[JustinRhodes]

so im dynoing the truck tomorrow and wanted to be able to hotwire the ksb. so i added the wires and switch in the cab and while testing it i have 12v on the wire that plugs onto ksb. i thought i wouldve been good to go. i start the truck, listen to idle, flip the switch then listen to the idle again and it idles smoother. correct me if i am wrong but i thought advancing the timing makes it rattle more at idle, not smoother?

Ive also read that if you have a earlier first gen that its the opposite and adding 12v retards the timing.
Now the engine in my truck is from a 90, but ive since replaced the original injection pump with one from a 92 so im stumped..

any suggestions of what may be wrong?

[TWorline]

You are correct with the 92 pump the idle will smooth out a little and the engine will pick up 20 -25 RPM.

[Tacoclaw]

Have you already advanced your timing?

[Richie O]

With stock timing you could smooth out the idle with KSB powered. My 93 with factory time will smooth out. I just put a jumper wire on mine once and I could hear the difference. The rattle comes in at more aggressive timing bumps. My 89 sounds like crap with the timing ahead, but runs well so its staying. You are correct, the newer pumps (factory intercooled) are the only ones that work that way. The non cooled trucks have power all the time already and it heats up the wax to retard the timing. They are not instant changes like the later pumps.

[JustinRhodes]

Have you already advanced your timing?

1/8 inch bump is all.

With stock timing you could smooth out the idle with KSB powered. My 93 with factory time will smooth out. I just put a jumper wire on mine once and I could hear the difference. The rattle comes in at more aggressive timing bumps. My 89 sounds like crap with the timing ahead, but runs well so its staying. You are correct, the newer pumps (factory intercooled) are the only ones that work that way. The non cooled trucks have power all the time already and it heats up the wax to retard the timing. They are not instant changes like the later pumps.

ok thank you, i was just unsure as why it idled smoother when i powered the ksb. i was under the impression that it would make it rattle more.

[Tacoclaw]

I guess that means that 1/8" wasn't quite enough, huh?

[JustinRhodes]

I guess that means that 1/8" wasn't quite enough, huh?

makes me want to put the pump to the head

and when i got the truck josh said it had pods, and i think if it does have pods i may need to advance it a hair more.

im advancing the timing now, got the top and side bolt, now trying to get the one closet to the block. its the biggest pita.

[JustinRhodes]

So when i turned the ksb power switch, my truck started surging around 20 psi and took forever to get to 40 psi like it usually does. with it off it shot to 30psi then took forever to get up to 40. when i completely got rid of the switch from the ksb my boost started shooting to 40psi and peaking at 45psi. idk whats wrong, but i think it was retarding my timing. but with the switch off there its running like it was before i touched the ksb, so ill still be dynoing tomorrow

[AHineman]

Sounds like too much timing.

[JustinRhodes]

Sounds like too much timing.

its was only bumped an 1/8th + ksb. that didnt sound like that much timing

i still dont understand why it idled smoother, thats why i figured it retarded the timing.

[TWorline]

Are you sure you didn't bump a tooth when you installed the later IP?

[JustinRhodes]

Are you sure you didn't bump a tooth when you installed the later IP?

99% sure anyways