PCV tweaks for mag vs pto

[GKR]

After first run on my fix kit with full SLP stage 3 package it would appear that the mag side is running leaner than the pto. In the PCV map there are four tables, one for each injector. Can anyone confirm which tables are for the mag side injectors vs the pto injectors? I would like to add fuel to the mag side only to try and even it out.
Running SLP map for this combo and it ran very well first time out, probably a little fat in the mid but safe. Added the SLP 5000+ head when I did the fix kit and seems similar overall to previous combo but throttle response in the low and mid is very good.

 

[gerrman]

After first run on my fix kit with full SLP stage 3 package it would appear that the mag side is running leaner than the pto. In the PCV map there are four tables, one for each injector. Can anyone confirm which tables are for the mag side injectors vs the pto injectors? I would like to add fuel to the mag side only to try and even it out.
Running SLP map for this combo and it ran very well first time out, probably a little fat in the mid but safe. Added the SLP 5000+ head when I did the fix kit and seems similar overall to previous combo but throttle response in the low and mid is very good.

I have been wondering that at times myself GKR. I am glad you brought the question up. I would think tables 1/3 and 2/4 go together as far as low/high throttle %, but for which injectors is the question. Somebody should know.

 

[Race]

gerrman, I noticed on the SLP 70-216 map you sent me tables 3 and 4 are some what the same with the exception of some small number changes. I thought that you or SLP had accounted for temp differences of the Mag & PTO side's like the old Gen II jetting.

 

[GKR]

Are you seeing the same variation between mag and pto? I don't have EGT's, only observation from plug color and piston dome. When I took apart the stock set-up it showed the same evidence of leaner mag side. Although this may be an engine design issue in combination with the OEM flash, the PCV does have the ability to deal with this well by mapping each cylinder slightly different. At least I think so. If someone can confirm which tables run which injectors I will certainly try and run the mag side richer and see what happens. Seems to me from alot of the threads including some first hand evidence, the lean burn downs primarily happen on the mag side?

 

[GKR]

That's where I'm heading with this Race. The SLP maps are pretty much dead even for both cylinders but the reality seems to be that they should be mapped differently to acheive proper burn on both if in fact the engine needs more fuel on the mag side.

 

[gerrman]

gerrman, I noticed on the SLP 70-216 map you sent me tables 3 and 4 are some what the same with the exception of some small number changes. I thought that you or SLP had accounted for temp differences of the Mag & PTO side's like the old Gen II jetting.

The number differences on the tables came like that from SLP when they sent it to me two years ago. I figured that they found some differences between cylinders and this was their adjustment. I never really questioned it.

 

[WStilson]

I am looking at my PCV map for the April flash from Dyno Tech and it is one map running both cylinders(4). I select the Map Tools, Advanced/Demote map tool and when I select Fuel Tables, Advanced, all 4 maps are blank. I am guessing I will have to fat finger the single table values into all 4 cylinders.

Any PCV experts who could give direction would be appreciated by all. Also, which cylinder is the mag?

Idaho Bill

 

[rmk addict]

Any PCV experts who could give direction would be appreciated by all. Also, which cylinder is the mag?

Idaho Bill

The mag side piston is the one closest to the exhaust, short for "magneto" because the electrical power is made on that side of the motor.

PTO piston is the other one (duh) named for its location above the PTO bearing.

Great info on the different mapping, Im curious to hear more.

 

[WStilson]

The mag side piston is the one closest to the exhaust, short for "magneto" because the electrical power is made on that side of the motor.

PTO piston is the other one (duh) named for its location above the PTO bearing.

Great info on the different mapping, Im curious to hear more.

I was asking which cylinder was the mag side in the PCV map, 1 or 2???

Idaho Bill

 

[GKR]

Yep, that is the question.

 

[mike_s]

Not sure how hard it is to make changes to the maps on one of these units, but i know when tuning GM truck engines, if you're not sure which map coresponds to which cylinder, i generally just make that one map run excessively rich, then look and see which one reads that way on the scan tool. Culd a guy not do something similer with a power comander?

 

[GKR]

No scan tool in this configuration, would have to try running one table real rich and determine it thru plug reading. May be where I end up but would be nice to know up front. I don't ride where I live so it's not so easy to use the trial and error process. I'm hoping someone can confirm this so I can at least get it where I think it needs to be without having to try and take the laptop along for the ride.

 

[minus40]

table 1 = pto upper injector
table 2 = mag upper
table 3 pto lower
table 4 mag lower

 

[GKR]

Trust a Rider fan to deliver the goods!
How did you find this out if you don't mind me asking? I have yet to get any confirmation from anyone......
Cheers.

 

[minus40]

Trust a Rider fan to deliver the goods!
How did you find this out if you don't mind me asking? I have yet to get any confirmation from anyone......
Cheers.

No problem, I just looked in the PCV CFI 4 installation instructions on the last page under the heading Advanced Maps.

Also the crankcase injectors are for high rpm and cylinder ones are for start, idle and low to mid per the 07-10 service manual.
Let us know how it works out.

 

[GKR]

Cheers! Will update after some field trials.