Redtop sr20det strange ignition timing issue - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Meeshka · 11-16-2015, 02:39 PM

Background on the car

s13 coupe
wiring spec pro harness
stock ecu
stock turbo
deuchwerks 300 fuel pump
non recirc'd hks ssqv

I am running into a strange issue, with the timing set to where it needs to be at 15 degrees the car feels insanely slow. It will build boost but not go anywhere, just feels really held back. I am better off giving it 20% throttle. I have tried two different CAS, two mafs, swapped fuel rails, fprs, ecus, unplugging the knock sensor, tps voltage is perfect, new plugs gapped at .3, new 300zx tt fuel filter. Idle and cruising wideband reads lean (17.5+) but under boost it does around 11-12. I do have an a small exhaust leak before the wideband I believe.

So with the CAS in the middle, and yielding 15 degrees with a timing light via the loop on the wiring spec harness it just wont get out of its own way. With the CAS maxed out advanced the car runs great. Pulls hard, throttle response is great, and doesn't seem to be pinging. Afrs still lean at idle and cruise, but like I said I believe there is an exhaust leak before the wideband.

The mechanical timing looks to be good, I have double checked the CAS is poked right. I just don't know what would cause something like this to happen. Anyone have any ideas? I don't feel safe running the car with the timing advanced so far even though it seems alright.

Frank_Jaeger · 04-27-2017, 12:57 AM

Bumping this ancient thread because I found it on a Google search.

My car had the same issue, I had to time it using a spark plug wire between the #1 spark plug and coil pack and it was fine. The loop usually gives a bad reading.

hanzbrady · 04-27-2017, 06:58 AM

Quote:

Originally Posted by Frank_Jaeger

Bumping this ancient thread because I found it on a Google search.

My car had the same issue, I had to time it using a spark plug wire between the #1 spark plug and coil pack and it was fine. The loop usually gives a bad reading.

Exactly, Haltech actually put out a video on why you should never use the loop in the harness for setting the timing because it's horribly off.

Kingtal0n · 04-27-2017, 01:46 PM

Always done it like this

You gota use common sense when you do these things. If you flip the pickup it will change the timing on some lights, so I always flip it both ways and compare the CAS setting, and move the CAS to low timing position to verify the engine RPM drops significantly as it should.

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11-16-2015, 02:39 PM	#1
Meeshka Join Date: Oct 2015 Location: North Carolina Posts: 6 Trader Rating: (0) Feedback Score: 0 reviews	Redtop sr20det strange ignition timing issue Background on the car s13 coupe wiring spec pro harness stock ecu stock turbo deuchwerks 300 fuel pump non recirc'd hks ssqv I am running into a strange issue, with the timing set to where it needs to be at 15 degrees the car feels insanely slow. It will build boost but not go anywhere, just feels really held back. I am better off giving it 20% throttle. I have tried two different CAS, two mafs, swapped fuel rails, fprs, ecus, unplugging the knock sensor, tps voltage is perfect, new plugs gapped at .3, new 300zx tt fuel filter. Idle and cruising wideband reads lean (17.5+) but under boost it does around 11-12. I do have an a small exhaust leak before the wideband I believe. So with the CAS in the middle, and yielding 15 degrees with a timing light via the loop on the wiring spec harness it just wont get out of its own way. With the CAS maxed out advanced the car runs great. Pulls hard, throttle response is great, and doesn't seem to be pinging. Afrs still lean at idle and cruise, but like I said I believe there is an exhaust leak before the wideband. The mechanical timing looks to be good, I have double checked the CAS is poked right. I just don't know what would cause something like this to happen. Anyone have any ideas? I don't feel safe running the car with the timing advanced so far even though it seems alright.

04-27-2017, 12:57 AM	#2
Frank_Jaeger Zilvia FREAK! Join Date: Jan 2012 Location: Port Charlotte, Florida Age: 29 Posts: 1,352 Trader Rating: (1) Feedback Score: 1 reviews	Bumping this ancient thread because I found it on a Google search. My car had the same issue, I had to time it using a spark plug wire between the #1 spark plug and coil pack and it was fine. The loop usually gives a bad reading.

04-27-2017, 01:46 PM	#4
Kingtal0n Post Whore! Join Date: Jul 2005 Location: South Florida Age: 38 Posts: 4,649 Trader Rating: (17) Feedback Score: 17 reviews	Always done it like this You gota use common sense when you do these things. If you flip the pickup it will change the timing on some lights, so I always flip it both ways and compare the CAS setting, and move the CAS to low timing position to verify the engine RPM drops significantly as it should.