Does anyone have a bin from a CA car, late model automatic 730 $8d mask? I'm curious to see the difference between my aujp and the CA one.

My car is from FL, and I've got a bit of an inaudible knock with 91 octane using the stock aujp tables. I've had a T-56 for a while and just swapped over to using an AXCN bin as a base. I've been using a modified AUJP. I noticed the EGR duty cycles and enable/disable points were different as was the CCP. Since my AUJP knocks on 91 octane but not 100 octane, I'd figure GM would have a different bin for CA.

On that thread, does anyone know why the EGR, CCP, and AIR are different between AUJP, the 92 Z28 T-5 bin, and the AXCN?

Thanks!

 

I haven't gotten around to looking at what GM did different between the cali and fed TPI chips but from the TBI chips I've got it broken down to every little detail. The quicky is that yes, they removed timing out in the idle area, didn't touch the VE (as they shouldn't), and got the engine into closed loop at a lower temp. Other than that there were some slight differences but nothing really drastic like the main spark table.

 

That's interesting. My knock is in PE and high load (about 3 degrees). When I put in 87 octane, it exacerbates the knock (about 8-10 degrees).

I'm also curious to know how EGR duty cycles should be determined. AXCN has no EGR at 800rpm and it jumps right to max all the way up. AUJP tapers in at 800rpm and tapers out at 70kpa.

 

If you're getting knock with a stock bin be it fed or cali you've probably got the base timing off. Those stock tables are rather conservative in the f-body calibrations. Only the vette tunes were on the aggresive side with spark and fuel.
How many miles on your engine and more importantly, how many on the h.balancer? If it's old it's not uncommon for the ring to slip off by 8-12 degrees. Do the good old white out on TDC and see if aligns with the timing mark. That's what I'd do first before looking at the bin for my knock problems.
What else have you done to the car? Manual transmission can trigger false knock if they (and the parts attached to them) aren't in good shape. My automatic triggers false knock on the 2-3 shift (it's in need of a rebuild).

 

I've got about 170k on both engine and balancer, stock engine except for full exhaust, t-56, poly motor mounts, and zr-1 heated o2 sensor. The only knock I can attribute to the tranny is if I bog it off the line or bog it in 5th/6th gear below 2k rpms. I may have some header knock, as my y-pipe touches my SFCs but that seems to go away when I retard my timing across the board by 8 degrees by setting the bin to 16* initial. I have my bin set to 8 degrees initial currently as the balancer seems to indicate 6-8* (it jumps around). I'll try the piston stops, thanks as I'll have the intake off in a couple of weeks to clean out the EGR passages and to replace the timing chain...may throw a cam in there too for the heck of it. *shrug*

Funny thing though, I don't recall a high rpm knock after my T-56 swap, but that was in winter (Jan/Feb a couple of years ago). There was a tip-in knock though when I mash it at low rpms, which is still somewhat there but I upped the AE and it's mostly gone. I'll try some top end cleaner too. I should pull the heads to clean it out and look at the pistons, but I'm not feeling that excited about it as I would be tempted to buy some new heads if I do.

All the knocks are inaudible.

 

It's been my experience that L98s are highly prone to knock in WOT with the stock bin and to have 10* of timing pulled is very common. No mechanical problems...it's just the engine.

 

I agree with Glenn91.
Prior to installing my AL headed 383 I too used the AUJP and discovered detonation with my stock 140k L-98. The stock bin I was using prior was ANJF with no knock but thats for an automatic so I'm not sure what you need to change. Unknown if it is a CA bin.

 

I use the AXXD (manual) and import the AUJP tables needed for the 350 (i.e. VE, timing, etc.)