I have a 1g laser turbo, with stock injectors and 14b turbo. I've been using the gm maft combo with a datalogger and when I roll onto the throttle from cruise I get a slight knock ping as high as 8 counts the second the car goes into open loop mode. I've been thinking with the maft settings but so far all I can do is make it worse. No matter which way the dials go I cant get rid of it. I'm wondering if maybe it's normal, like an engine stutter when it transitions.any ideas?

Sorry but I haven't got a readout of the datalog yet. When I get one I'll post it.

The GM maf and maf-t combo alone isn't going to tune your car well enough. It's a dramatic change from the stock setup and isn't really refined enough to tune alone. You also need a SAFC-2 to do your fine tuning with. My old GST with stock injectors and 14b I managed to get it dialed in pretty well but it still wasn't perfect. SAFC-2 is pretty limited to anything above 650cc injectors so if you ever plan to go larger it may be worth just getting DSMlink with the GM maf cable.

I plan to get ecmlink in the future, for now its what I could afford. I do have the v.2 translator which can do a little better tuning but really i was wondering if 8 points of knock is going to cause problems down the line. Aside from a slight power plateau from the timing being pulled, i dont even feel or notice it at all.

If it's true knock, then it's going to cause an issue sooner or later.
Get ecmlink or another proper tuning solution, and probably set the car back to stock till you do to prevent damage.

Henry knows that I didn't trust my knock sensor so I tuned it "out of range" since it was showing knock at 4-5*. It ran real good.......ONCE. Then I limped it home on 2 1/2 cylinders, 2 smoked valves and I melted the edge of a piston down to the 1st ring. Don't run it with knock, you will run the same risk.

1990TSIAWDTALON said:

Henry knows that I didn't trust my knock sensor so I tuned it "out of range" since it was showing knock at 4-5*. It ran real good.......ONCE. Then I limped it home on 2 1/2 cylinders, 2 smoked valves and I melted the edge of a piston down to the 1st ring. Don't run it with knock, you will run the same risk.

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The problem is nothing I do seems to get rid of it. According to my wideband my a/f ratio averages 12.3 at that specific moment so it's not like I'm lean. In fact I think I'm maybe too rich. My mechanical and cas timing are perfect. I'm almost under the impression that its could be due to my lack of balance shafts.

I won't disagree with you. I have 2 cars that have BSE and one that is stock. Hard to compair but the BSE cars sure vibrate so its "possible" that might translate to some feedback in our sensors.

Do you happen to know what the average timing advance should be under wot. I may just try to tune it like a 2g.

Stock 2g Max Timimg is the 1st map, Min Timing is the 2nd map.
Under WOT it pretty much follows the line on the maps.

I have found that the knock sensors on these cars are helpful but not the end all be all. Granted I NEVER see some of the counts of knock I see some on here have. But if I run into knock sooner then I expect I will start pulling the plugs and reading them. Sometimes it turns out the car wants more timing by the burn mark and the plug shows no signs of DET. That being said with what you have to tune with and go off of I would 100% get rid of the knock.

Hmm if 14 to 16° is your average timing advance I wonder if maybe my car is adding to much timing initially, typically it starts at 22° and drops down to 17°. I could try retarding the cas slightly.

Another thing I'm wondering, if I have the base timing set to 5 degrees advance, if I ground out the pin on the firewall, I assumed I would see 5 degrees advance on a datalogger, but I'm actually seeing 8 degrees. Is this normal? Or am I missing something.

I would say your balancer has moved or wasn't perfect on the timing mark. Try to set it where the logger says 5*. 8* won't hurt it but if you are battling timing or knock then set the timing how the logger see's it.

1990TSIAWDTALON said:

I would say your balancer has moved or wasn't perfect on the timing mark. Try to set it where the logger says 5*. 8* won't hurt it but if you are battling timing or knock then set the timing how the logger see's it.

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I checked mech timing, is about as perfect as I can get it, I did notice that my belt, which is new, has roughly 3 degrees stretch/slack to it. Not sure if that will affect it overall or if getting the kevlar belt might fix that. I actually reduced CAS timing to 3 degrees instead of 5, figured if knock was the issue maybe its safer if I run less timing.

1990TSIAWDTALON said:

I would say your balancer has moved or wasn't perfect on the timing mark. Try to set it where the logger says 5*. 8* won't hurt it but if you are battling timing or knock then set the timing how the logger see's it.

Click to expand...

As far as changing what the logger reads, I can make the advance go up but not down. I will try to set it to what the logger reads, as far as the balancer goes it reads as close to 5 degrees advance as my eyeballs can get it. Still not much change, I did realize that I was adjusting the mid improperly so that's gotten a bit better. I might try increasing the fuel pressure slightly today and see if theres any change.

So I realized I only get the slight knock if I'm only partially on the throttle, at wot it doesnt knock at all