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Thread: SR20VE Help Need-Ignition Timing Fighting Me - High RPM Misfire-Sounds Like Anti Lag

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Posts: 31-40 of 68
2015-06-25 08:26:22
#31
All this will work for a pretty stock VE but once that engine starts to move some air and you got a good induction system and exhaust system with N1 or better cams ... Most the VE engines I have built ECUs & Tuned make power up around 9300RPM and the stock ECU will not go that high it stops at 8050RPM .. Or even turbo with air flow it will start to make power up there too...
2015-06-25 08:29:35
#32
Originally Posted by VE-Baller
I can increase injector duty cycle with the FIC. I will richen the mixture.
Cap is perfect, plug wires Magnecor.
Iridium plugs
I tired a VE coil, exact same problem
I will upload the logs


Humm... Not saying the wires are a problem but.. I do know OEM and NGKs are the best to use.... Keep us posted on how it runs...
2015-06-25 08:41:11
#33
Originally Posted by shagspeed
All this will work for a pretty stock VE but once that engine starts to move some air and you got a good induction system and exhaust system with N1 or better cams ... Most the VE engines I have built ECUs & Tuned make power up around 9300RPM and the stock ECU will not go that high it stops at 8050RPM .. Or even turbo with air flow it will start to make power up there too...


What would you change? The cables only?

You might be on to something. I will check them for holes caused by the spark grounding through the boots or the cable itself. That would fit the symptoms I am having.
2015-06-25 08:54:58
#34
Yes... Check the wires.. Also Conductive Di-Electric grease creates a more conductive pathway across the clips at the cap and plugs .. Prevents corrosion and burning ...
2015-06-25 08:58:06
#35
Ill try it
Last edited by VE-Baller on 2015-06-25 at 13-37-57.
2015-06-25 19:19:15
#36
Originally Posted by VE-Baller
Hello Killer - About the FIC. You could be right. For NA, probably not the best thing to use. But the goal is to put a turbo on it but that is pointless if I cannot get it to run properly NA

About setting mechanical timing. I warm it up, rev it 3 times past 3000rpm pull the tps and then put the gun on it. Lines are rock solid on the pulley. ECU talk still shows 15 degrees though regardless of where the mechanical timing is set.

Car idles at 750rpm. When I first fitted it to the car it would idle at 1500rpm, but the Nissan ECU slowly brought that down over a couple of months.

If what Haulin wrote about the ECU talk just reading on the base map that would make sense.

In your experience clocking the distributor changes the timing reading on an ECU Talk?

If so, I have a problem somewhere.

I put the timing back to 22 this morning (mechanical, ECU talk still shows 15). Different car, tons more power & revs cleanly to redline. I bet the problem will come back this evening though.

I have a wideband. AFR is 13:1 WOT 4-7k RPM

I did a data log this morning when it was running properly.

I will do one again this evening and upload the files.

No offence taken.



You have to ignore the ECU Talk. It's only reporting the timing from your timing map. Here's what a timing map looks like.



Notice below 800 rpm its 5*. If you idle at 750, the ECU Talk will report 5* no matter how you clock the distributor. As long as the idle is below 800 rpm ECU Talk will report 5*. If you rev to 1600, the ECU Talk will report 12* because that what in the timing map.
Last edited by KillerKrossover on 2015-06-25 at 20-32-11.
2015-06-26 07:58:15
#37
Ok thanks.

This is what the log shows when I have the problem. Foot to the floor but hesitation - Revs rise and fall.

Im pretty sure it tells us nothing.

Summary
3.76 Volts wide open throttle.
4 Volts max MAF
Timing 16
Revs 5500
Injector 65% duty

Time RPM Bat TPS Tim Inj Dty Air Flow
25:02.4 4900 12.96 3.76 15 11.98 48 3.68
25:02.5 4937 12.96 3.76 15 12.08 49 3.7
25:02.5 4975 12.96 3.76 16 12.3 50 3.74
25:02.5 4962 12.96 3.76 16 12.46 51 3.76
25:02.5 4950 12.96 3.76 16 12.46 51 3.77
25:02.5 4950 12.96 3.76 15 12.54 51 3.76
25:02.6 4937 12.88 3.76 15 12.54 51 3.74
25:02.6 5012 12.88 3.76 15 12.61 52 3.74
25:02.6 5037 12.88 3.76 16 12.71 53 3.78
25:02.6 5037 12.88 3.76 16 12.77 53 3.8
25:02.6 5025 12.88 3.76 16 12.91 54 3.8
25:02.6 5050 12.88 3.76 16 12.87 54 3.79
25:02.7 5087 12.88 3.76 16 12.97 54 3.8
25:02.7 5075 12.88 3.76 16 13.01 55 3.82
25:02.7 5100 12.8 3.76 16 13.05 55 3.82
25:02.7 5112 12.8 3.76 16 13.21 56 3.84
25:02.8 5137 12.8 3.76 17 13.29 56 3.86
25:02.8 5175 12.8 3.76 17 13.35 57 3.88
25:02.8 5162 12.88 3.76 17 13.51 58 3.9
25:02.8 5175 12.8 3.76 17 13.53 58 3.9
25:02.8 5187 12.8 3.76 17 13.59 58 3.9
25:02.9 5200 12.8 3.76 17 13.65 59 3.9
25:02.9 5225 12.8 3.76 17 13.77 59 3.9
25:02.9 5250 12.8 3.76 17 13.79 60 3.92
25:02.9 5300 12.8 3.76 17 13.85 61 3.94
25:02.9 5362 12.8 3.76 16 13.87 61 3.97
25:03.0 5412 12.8 3.76 16 13.87 62 3.98
25:03.0 5475 12.8 3.76 15 13.66 62 4
25:03.0 5550 12.72 3.76 15 13.71 63 4.01
25:03.0 5525 12.72 3.76 15 13.72 63 4.02
25:03.1 5550 12.8 3.76 15 13.69 63 4.02
25:03.1 5575 12.72 3.76 15 13.69 63 4.03
25:03.1 5575 12.56 3.76 15 13.7 63 4.01
25:03.1 5550 12.64 3.76 15 13.71 63 4.02
25:03.1 5462 12.64 3.76 15 13.71 62 4.01
25:03.2 5425 12.64 3.76 16 13.71 61 4
25:03.2 5412 12.72 3.76 16 13.87 62 4
25:03.2 5425 12.72 3.76 16 13.65 61 3.99
25:03.2 5462 12.72 3.76 16 13.7 62 3.99
25:03.2 5525 12.64 3.76 16 13.7 63 4
25:03.2 5537 12.72 3.78 16 13.7 63 4.01
25:03.3 5587 12.72 3.76 15 13.7 63 4.03
25:03.3 5662 12.72 3.76 15 13.7 64 4.04
25:03.3 5737 12.72 3.76 15 13.62 65 4.06
25:03.3 5737 12.72 3.76 15 13.7 65 4.07
25:03.4 5837 12.72 3.76 15 13.57 66 4.08
25:03.4 5737 12.72 3.76 16 13.68 65 4.11
25:03.4 5600 12.72 3.76 15 13.7 63 4.09
25:03.4 5612 12.72 3.78 15 13.68 63 4.08
25:03.4 5637 12.8 3.78 15 13.46 63 4.08
25:03.5 5562 12.8 3.76 15 13.67 63 4.06
25:03.5 5487 12.8 3.78 15 13.67 62 4.04
2015-06-26 08:11:07
#38
I see your TPS is not correct... Do a log of you going off and on throttle... Maybe your TPS is not working.. Without TPS the stock ECU has no way of knowing tip in enrichment .. Its what they call TPSDOT or TPS Distance Over Time .. More TPSDOT the greater the enrichment... Your TPS should read about 0.45v closed and greater then 4.5v at WOT .. @ 3.7V the ECU will not go into closed loop

Also your ECU is not commanding any timing at all... That thing is WAY off on power .. Down like 25HP or so I would think .. Also once you get your TPS fixed you may have a lot more timing in it.. You want your total timing to be no more then 39deg .. So if it commands 32 then your 22base is fine.. If it commands 34deg set your base to 20deg ...
2015-06-26 08:23:41
#39
Hello Shag

0.18 Volt when the throttle is closed.

Max timing I see is 22 when there is no problem. When you say 32-39, you are talking about a DE ECU right?

I will investigate the throttle body and report back.
Last edited by VE-Baller on 2015-06-26 at 08-26-01.
2015-06-26 08:31:14
#40
Yah 0.18 is too low.. Set to .45 and see if your max is at 4.5 or slightly higher... A .45 is required for idle and 4.5 is required for WOT .... So stock ECU base timing is 15deg .. If ECU talk shows 32deg its 32deg so 39deg max is what you want so 39-32 = 7deg you need to add to the base.. So 15deg+7deg is 22deg base .. But if ECU talk tells you 34deg on the top end then 39deg max subtract 34deg command leaves you with 5deg you need to add to the base and 15+5=20deg base ... I hope that makes since when I say you want a 39deg max actual timing .. You need to add to the base of what the ECU is commanding ..
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