lfrers

iTrader: (9)

Accelerating through 4k RPM under about 15-20+ lbs of boost, if some pinging occurs, would adjusting the timing help with that?

morris

iTrader: (2)

Yes it would of course you may also loose a little power.

Are you sure the issue is timing?
Could be bad fuel, low octane, fouled plugs etc

It just strikes me that that isnt a huge amount of boost and if it was running fine and all of a sudden it starts pinging, there may be an issue other than timing.

lfrers

iTrader: (9)

It's always done it since the car was turbo'd. The dyno and S-AFC tune helped a little. But I notice it again. And I agree. It's not a lot of boost.

After posting I realized that I never checked the cap & rotor. So I had a look. My distributor cap is worn and the rotor is shot. I'm going to pick some up from the Toyota dealer tomorrow. I can't decide what else to check for what else could be the cause.

morris

iTrader: (2)

check the plugs and maybe replace the wires while you are at it.

lfrers

iTrader: (9)

Heres an image of the rotor. The conductor is 3/4" wide. the only part thats left intact is one of the sides on the far edge. I guess the spark could be arching over just a few degrees off time. Dunno. I guess I'll find out when I throw the new parts on. This one is DENSO Brand. I'm wondering if that is the stock brand? If so this rotor has 60K on it. I guess I should have done a tune up before going to the dyno. Oh well.

lfrers

iTrader: (9)

Went to Mission Beach. Took a few pics.

lfrers

iTrader: (9)

Wess syyyyyyyed. hehe

motorheaddown

Absolutely... you're probably going through peak torque at 4k RPMs. That's when the motor is experiencing its heaviest load. Pull a few degrees and log it again. It should be safe to add the timing back once you've punched through peak torque.

-scott

5spdSC300

iTrader: (1)

^^ Unless his engine management has changed from his sig, he has no way or tuning timming.

lfrers: It could be the octane as to why your knocking. 15psi to 20psi is a big diffrence on 91 **** gas.

lfrers

iTrader: (9)

I'm going do the tune up.
Retard the timing a few degrees.
If that does not work i'll put in some 100LL avgas see if it helps.

OK one more question guys.
Would poor intercooling contribute to this as well?
My intercooler is a piece.
Its very old and was sprayed painted over 'cause it was so fugly. Its still 100f here everyday. Although it was in the 80s in San Diego and it was still pinging.

I ordered a new one.

Core Size 20"X6"X3"
Overall Size 23"x11"(9.5")"x3"
2.5"Inlet & Outlet
3" Thickness Core

My setup is strange. The car was originally buily up to a stage 4 car in 2000 by Toyomoto in FL.

morris

iTrader: (2)

There are a lot of factors that makes a car ping. The intercooler could be a cause. High intake air temp increases the chance of detonation.

lfrers

iTrader: (9)

Yea... That's what I was thinking too. I will go along with the process one step at a time and post what the fix was. I'm hoping it will just be a tune up or timing . I dont want to think I need to run 100 octane in this thing as a daily driver.. Is adjusting the timing back a bit a normal step to do in the NA-T process?

lfrers

iTrader: (9)

Just for info the cap n rotor fixed my pinging under boost.

skeet94

Just get water/meth injection . With the **** gas you get where you're living it will help ALOT by reducing intake temps...and will help in future too .