Okay I've gotten my BLMS in a pretty descent range and my throttle response is pretty good.

When I sit at an idle... or a slow speed/rpm and give it some throttle.... now and then there will be a POP from the front of the engine. In the beginning it would do it sitting in the driveway if I reved it from the throttle body.

Started with a 146blm idle. Got it down and good, and added some AE vs LV8 and throttle came alive. But it still popped now and then. All I can guess is that it is a lean pop. All the mechanical aspecs are good... IE Plugs/wires/base timing/etc

So I made my idle rich to 116blm... and it still does this.... I managed to catch it on the data log and here is that log..... I think it occured as the O2 was in the double digits...

Any Ideas?
RPM MAF g/s TPS V MPH TPS% MAT
2275 35.24 0.78 17.1 6.2 120
1975 24.48 0.75 18.1 5.2 121
1725 23.04 0.75 18.1 5.2 120
1600 22.73 0.75 19.1 5.2 120
1600 22.25 0.75 19.1 5.2 120
1575 22.8 0.75 19.1 5.2 120
1575 34.14 1 19.1 11.6 120
1675 63.94 1.53 20.1 25 120
1625 65.66 1.9 20.1 34.4 120
1975 71.12 1.96 20.1 35.9 120
2125 72.66 1.98 20.1 36.4 120
2175 84.25 1.98 20.1 36.4 120
2325 86.09 1.96 21.1 35.9 120
2450 87.94 1.92 21.1 34.9 120
2475 81.1 1.59 21.1 26.5 120
2525 57.28 1.1 22.1 14.1 120
2325 42.24 1 22.1 11.6 120
2150 38.01 0.94 23.1 10.1 120
2050 33.44 0.9 23.1 9.1 120
1975 32.78 0.9 23.1 9.1 120
1950 32.59 0.9 24.1 9.1 120
1925 32.55 0.9 24.1 9.1 120
1850 32.8 0.9 24.1 9.1 120


Temp Spark Knock Retard O2 BLM Cell
181.4 35.9 5 0 928 15
181.4 35.9 5 0 972 11
181.4 35.9 5 0 986 10
181.4 35.2 5 0 981 10
181.4 34.8 5 0 972 10
181.4 34.8 5 0 964 10
181.4 34.1 5 0 950 10
181.4 22.2 5 0 778 14
181.4 22.2 5 0 124 14
181.4 22.9 5 0 84 14
181.4 22.9 5 0 66 15
181.4 22.9 5 0 71 15
181.4 22.9 5 0 62 15
181.4 23.2 5 0 62 15
181.4 25 5 0 66 15
181.4 35.5 5 0 875 15
181.4 35.9 5 0 981 15
181.4 35.9 5 0 986 15
181.4 35.9 5 0 977 15
181.4 35.9 5 0 972 10
181.4 35.9 5 0 955 10
181.4 35.9 5 0 946 10
181.4 35.5 5 0 941 10




BLM INT FFC LV-8 BPW
128 130 128 82 3.16
126 129 126 62 2.38
130 127 121 65 2.41
130 126 118 68 2.53
130 125 117 69 2.47
130 123 115 68 2.43
130 128 128 93 3.59
126 128 128 165 6.64
126 128 128 186 7
126 128 128 165 6.23
128 128 128 165 6.48
128 128 128 179 6.87
128 128 128 176 6.76
128 128 128 172 6.59
128 128 139 160 5.84
128 129 126 120 4.43
128 128 125 91 3.45
128 126 116 87 3.22
128 125 115 79 2.9
130 124 114 79 2.91
130 122 113 80 2.96
130 121 113 82 3.02
130 119 111 87 3.11



I am running an ARAP bin with 3 deg more timing down low, 22lb injector constant on 24lb SVO injectors. The 5 knocks are 2 when starting, and 3 from my trans not liking WOT in 2nd gear.
Sig is what I have mechanically. HELP?! POP MAKES ME WORRY!

 

Tried a new chip to make a 128 blm idle.....

Narrowing the feel of the pop. It feels now kind of like its coming through the exhaust.... I can't be sure. I can't get it to do it in park anymore...

This time from a stop light... if I gave it enough gas to go... THEN got on it it would pop then go.

Lean pop still or too much pumpshot which I don't think I have too much of because its happend since the head/hsr install... before I played with the AE vs Change in LV8


I was thinking of trying to add more gas right as I tip the throttle... but I don't see an AE vs TPS... just the load/coolant changes

 

Looks like a lean pop due to the O2 voltage dropping to 15mV ....

Need more AE (IMHO)

Tim

 

The O2 went down to 62.... 84-66-71-62-62-66 Which I still understand is pretty low....

Right now with the ARAP bin and the 6Ev009 ECU, my AE vs Change in LV8 is:

LV8 Factor
256 22.66
192 22.66
128 18.75
64 16.02
0 14.06


Factor being the variable what should I change them to?

Stock ARAP bin was:
20.31
20.31
15.63
12.50
12.50


Thanks Tim!
-Paul

 

here we are again. youll need to reduce the value in the AE pw decay vs collant temp table. youve got a big enough intial shot but its tailing off to fast .

 

An O2 of less then .44 means your leaner then stoich..
As Trax mentioned,

I've never seen an engine perform well at less then stoich on tip-in. On a 3rd gen anyway.

There are several items to balance on AE. First, easiest, and usually close is just adding some AE thru delta TPS, and delta LV8/MAP.

And when adding fuel seems to make no change, ramp out some timing.

 

nice and rich then wham drops off.



The Ae is phasing out to fast. granted looks like a bigger shot could be needed. but id try to get those decay values setup right. once you get the correct decay time then all you have to do is make the shot bigger or smaller and it'll fall together pretty quickly.

heres a post that could qualify as MAF AE tunning 101. im not sure why it never got into the stickys.

MAF ae tunning post

 

My min LV8 to enable is set at 20.... I havn't seen my car at a load under 40, and that 40 load was only going down a hill with my foot off the gas.... should I set it up to something like 40?


That article helped explain alot. I beefed up the pulses and fixed the decay a bit and I'll see where that goes. One table I have un addressed is:

Accel Enrich %BPW Factor vs Async Pulse

It has pulse 1 through 8... and a variable "factor" all set to .50

What does that one do?

And another:

LV8 Accel Enrich Coolant Factor vs Coolant Temp

Has temps and multipliers.


Noticed also that in open loop, it pops REALLY easily....

Thanks guys!

 

bpw is calculated form the MAF tables and injector constant. if the PW is at 2.3 milliseconds

factor 0.50 x 2.3 = 1.15 maximum allowable AE pulsewidth to be added. the larger that factor the bigger the AE PW added can be. that could need to be re dressed in the tunning article. im not sure i typed everything up correctly.

 

And this one:

LV8 Accel Enrich Coolant Factor vs Coolant Temp

Has temps and multipliers.

Kinda of confused on it.

306 0
262 .05
219 .05
176 .05
133 .15
90 .35
46 .43

 

by reducing the values you clamp the AE delivery at higher temps. basically its just a way to finess the AE at varying engine temps.

 

so at 175 deg.... if I put it to .10 instead of .05..... I can get more AE?

My temp is always at approx 180... except before it warms up to that.

 

yep