Erik Beeman

Just curious to see how far people have advanced before pinging or knocking starts? I'm set at 8*-10* right now and having no problem, running 87 octane on stock compression ratio. Distributor wont go any further to advance it, but I'm thinking of jumping a tooth and resetting the distributor so that I can advance it a little more. I'm thinking 12*-14* as long as I am not knocking, maybe more. This motor spends about 80% of it's life above 4,000 RPM's Anyone have input?

FWIW, the highest octane here in California I can get is 91, and the motor is built 22RE w/ about 7K miles.

sb5walker

Your timing may not be as advanced as you think: the knock sensor will cause the ecu to retard timing as it begins to pick up detonation. Using an advance timing light with no jumper set will show you whether that's happening as you rev the motor.

muddpigg

iTrader: (1)

8* shorted or unshorted. I've seen what happens when a tooth is off, but do your thing. I've run 12* shorted so roughly 18* unshorted.

Erik Beeman

8* shorted, and the motor does not utilize the knock sensor.

Erik Beeman

Timing is being set with Te1-E1 shorted, and idle around 900RPM. Anything lower and motor has rough idle due to cam.

muddpigg

iTrader: (1)

Did you disconnect the knock or what do you mean does not utilize?

Erik Beeman

Well then, please explain. This is the reason I'm asking!




And what was your result?

Erik Beeman

No. The block is a junkyark block, so it has room for the knock sensor, but the ECU does not use a knock sensor. It's a 92 2WD ECU.

Erik Beeman

http://www.ncttora.com/fsm/1993/engine/44engin.pdf

No knock sensor is used on the 2WD ECU's.

muddpigg

iTrader: (1)

Don't do 2wd. Advance it as far as you like but the end result is to where you want you powerband. Depending on you cam you may not want to move to to far up in the rpms.

Erik Beeman

Don't do 2WD? I don't quite understand that?

The cam is meant to run mid-high RPM's. It's lopey at idle, which is why I mentioned it's got a rough idle.

muddpigg

iTrader: (1)

It'll all be ok. don't really feel like coaxing information out of you about your engine to better understand. Good luck.

sickcrewcab

The amount of timing advance you can run depends on your octane rating, and compression. I don't know what has previously been done to the 22RE in my truck, but the compression is 185-190 across all the cylinders. I put my timing at 8 shorted and it pings with 87 octane. Timing at 6 and its fine.

My buddies truck on the other hand. He runs his timing at 10 and has no problems at all with 87 octane, but his compression is 145-150 range.

Erik Beeman

Stock 9.2:1 and 180psi on all cylinders. No pinging from me yet.