I bought a stand alone system out of Iceland for the Toyota- which at the time didn't offer knock, for an extra $200 now you purchase an option which includes WB and knock- have to force knock on a dyno to tune. This is off my topic tho, I tested the oem ESC module on the Chev and it was the same if not a little more sensitive, not sure I want to purchase the matching knock sensor- both applications are 350cid one is a 85 Corvette TPI (BLH) and one is 89 K1500 TBI.
Just remember that the sensor and the module are two totally different things. I'm not suggesting you need to do anything with the sensor. But if you want the existing EFI to do knock retard like factory, then the knock module is what you have to adjust, and all it does is pull a line low to tell the ECM/PCM when it thinks knock is occurring. Sounds simple in theory, but when we don't know the pinouts for the module and have to account for how much knock to report and when, things get tricky.
There are absolutely other ways of doing it. It's ultimately only if you want to use factory hardware that you end up in the situation where you would need to create your own custom knock module.
1990 Corvette (Manual)
1994 Corvette (Automatic)
1995 Corvette (Manual)
There are absolutely other ways of doing it. It's ultimately only if you want to use factory hardware that you end up in the situation where you would need to create your own custom knock module.
And there is the rub- the engine is far from factory- and relatively noisy, so the knock system is not that useful.
As an aside, engine was intended to be 9.5:1 modeled after vortec with AFR head/FIRST TPI, have been trying to tune to 87 octane- I have a few avenues left to try but have audible ping in certain areas. Where do you give up and move up in octane?
After failing to reduce knock by adding 1oz MEK per gallon to your 87 octane fuel. :-)I have a few avenues left to try but have audible ping in certain areas. Where do you give up and move up in octane?
This is an EBL setup, and the ping has been an issue for some time. I dabble in tuning so don't really know it well. I was thinking last night that the learns is doing its thing, I've cut PE/SA to 0, I've taken 5 deg out universally and although it clears up most of the knock table it will still ping in a certain area even with 0 timing. I've filled up it up with better octane and the same thing. So I'm thinking it's going lean under heavy throttle and options are PE, AE, or VE adjustments. This is a 383 sbc with modern alum heads and a version of tpi- so I'm also thinking the tuned ram is really doing something.
In order to stop kock the KS system will reduce spark advance when knock is detected then advance spark back to the ECM desired timing while knock is not occurring. If knock occurrs at any time then spark advance will again be reduced. In order to ensure effectiveness I would look at the kock and spark advance during knock to ensure the minimum allowed advance is not too high. If spark advance cannot be reduced enough then knocking will not stop. I would then look at the initial retard when knock occurrs and the rate at which the system returns advance.
And I wouldn't be afraid to add MEK. :)
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