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Old 09-17-2013, 04:08 PM   #11
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Old 09-17-2013, 04:11 PM   #12
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Dyno and see , in most cases the engine will tell you where it wants the spark to be if you will listen to the datalogs , some ZX2 knock sensors are overly active but going from 14 to 8 deg if you went that low and it wasnt right you would feel a HUGH loss in power

Excessive timing will lift the head and blow the HG and 6 deg is more then enough to do that and beat your bearings out as well

Now saying all that , you ecu code may need 8 where the next guys ZX2 with a diff ecu code may need 14 , you cant make the blanket statement that 8deg timing for your compression and amount of boost will work for for the next guy, even the same ecu code with the MAF in diff location , cam timing , temps etc would all change the amount of timing the engine could require

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Old 09-25-2014, 06:27 AM   #13
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Something very weird happened yesterday with my spark. I'll start this post by mentioning that I'm kind of disappointed that my car (8.5:1 CR) can't handle much spark. Some datalogs I've seen the knock sensor pull ~6* at 1.75 load from 4000 RPM to 5500 RPM. So, the actual spark is only 2*.

So, I've slowly been upping the boost and I got to 24 PSI yesterday. My load plateau'ed at 2.0 and about 1 second after that the spark value on the datalog went to some crazy high number like 11 billion. My though is that the KS was pulling spark and it went too negative, or maybe the load plateauing is an issue.

Tom or anyone, please let me know if you think I have an issue here.

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Old 09-25-2014, 10:02 AM   #14
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You have to change things so the load stays below 1.95 if you hit 2.00 it causes issues all over
Fix that and you should be back to where you were

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Old 09-25-2014, 10:51 AM   #15
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Being you have PRP --> http://www.sctflash.com/forum/forumdisplay.php?f=15
It'll take a day or two to be verified.


To lower load you'll probably want to increase the CID. But that depends on how close to maxing out the MTF you are. Both are factors in figuring load.
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Old 09-25-2014, 01:21 PM   #16
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Thanks guys. I read the PRP book almost 10 years ago. So, I forgot about having to scale displacement to prevent from hitting 2.0 load. I have posted on the PRP forums before but its been a couple years.

I might just keep it below 2.0 for now since its not like I get any traction in the lower gears anyway.
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Old 09-25-2014, 01:32 PM   #17
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You MUST keep it below 2.000 in my opinion it isnt an option

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Old 09-25-2014, 01:48 PM   #18
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Tom turned me onto the TQ tables.
Might want to play with them to try and gain some low speed traction and save tires. Works pretty well.
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Old 09-26-2014, 01:06 PM   #19
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Does it just use spark to reduce torque? Can it be based on speed in addition to RPM?

Are there any posts/write-ups you could point me to?
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Old 09-26-2014, 09:32 PM   #20
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Yes, it's a spark retard.


Not really.
In the search box type "TQ Limit Table" and you should find them.

It's set up by gear, RPM and Load (IIRC).
If you need MPH, just do the math from tire diameter and RPM to figure the correct RPM.

It'll take you some trial.error but you should be able to make it act virtually seamless.
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