Looking for a LT4 log with SCIAP Vacuum and Pressure in the channel list.

[GHuggins]

As long as you have User Defined Parameters Will will make the "base" tables for you. If you want different axis in them such as the lt4's vs a trucks then you need to specify that up front as you won't be able to change the axis after the fact. Will will also set the maximum settings to adjust the tables too. You will then edit the tables using the xdf file Will sends you. If Will edited the tables - went ahead and put lt4 tables in for example (I recommend this) then all you have to do is open an older file you have with the xdf file to see what was in it previously.

I did not know there was a second iat2 switch input, so you found something else there.

Since you're working on a car the rate table isn't 100% necessary, but it is nice to have it as it is different even between the cars vs the lt4's. I'll attach some pics at the base of this illustrating how to adjust them. Still have to do a lot of screen shots for the big write up... Will also has a pretty involved day job on top of all of this now. Another reason I'm not jumping to post everything

Main tables you need - sciap offset and linear / manifold volume if your OS doesn't have it / throttle rate / pedal progression / sciap factor / supercharger equipped you should have / the iat2 you found?

Other tables you might want to get - accel based limiters - there's two of these / tcs settings (these were thanks to Verlon)

After all of this you'll need the sciap wired in like a lt4's and the lt4 map wired in like a lt4's since you have a car you can take the temperature input straight to the ecm - you can verify with Will as I know Will has done this. You should go to using the iat2 for your timing changes (maybe this is where that second switch comes into play now that I'm thinking about - haven't fully confirmed the timing controller part) and basically have a mostly factory lt4 controller after all of this.

Edit - Will already responded Also looks like Will has already messed with that switch some.

[GPGTP]

you guys are the best, really though. I'm in the process of doing this to my car as soon as I can work on it instead of customer cars lol. Will hooked me up, I'm excited to try it out. I'll update as I do it.

[GHuggins]

Write up on it here - https://forum.hptuners.com/showthrea...468#post745468

[Landolt]

FYI,

I contacted support about tables 4013 and 4014. They just added them to the latest Beta download.

[GHuggins]

I'll just give a forewarning to anyone messing with the tables I posted, they can cause one to run away, so don't increase idle areas Lots of secrets in those tables to fix lots of problems. The progression table has been known by hpt for awhile. Just don't think anyone knew how to adjust it.

[Landolt]

They only added the SCIAP linear and offset. Would be sweet if they did the other two. I will still need to get ahold of Will for those.

[GHuggins]

They'll add the pedal progression since they already have that in some of the cals, but it's highly unlikely that they would add the throttle area/rate table. I'm honestly surprised the progression table is in some. Probably too many risk for them to add those, but they make a night and day difference when tuned right

[Landolt]

First off want to Thank Ghuggins for the writeup he did on installing the SCIAP sensor to a L83 truck, also to Alvin that makes a great harness for the SCIAP. This was my first time ever re-pining a vehicle. The install went smoothly and didn't have any check engine lights on once I started the truck or after a test drive. My throttle is much more linear, and I feel it can be made better with some DD work. The log shows a spike or 2 on ever increasing throttle, but much better than before. The blade actually is behind the pedal now, but that's due to DD being decreased in the middle range to control the spikes before the SCIAP install. I may end up getting the background tables suggested to make it 100% dialed in but I'm thrilled as how good it feels now.

I would attach the log file but apparently, it's too large. Under boost the readings were....
Barometric pressure 104 kpa
Supercharger Inlet pressure 97 kpa
Absolute manifold pressure 142 kpa

I assume from this, it's working as it should, when not in boost it reads the same as Manifold.

Thanks again to everyone on here sharing info so Hobby Tuners like myself can make their own vehicles run great.

[MeanMike]

Old thread, but I think this is the most applicable place. Seems like all of this is referencing 14-18 trucks.

I'm putting a magnuson 2650 on a 2020 L84 with the E90 ECU. It's a lingenfelter kit and includes their SCM-001 IAT/BARO breakout harness. They have you use the Baro breakout from the maf to plug into the included LSA map sensor post rotor and put a 1 bar that ties into the SC inlet tied into the factory map connector.

I didn't buy their tuning, so I'm on my own figure out what they were trying to do. I'm assuming this is their attempt at a simple SCIAP addition without making ECM pin changes that some individuals would get confused by.

I already have the 4013 and 4014 parameters. Is the Pedal Progression table you all are referencing the same as the Driver Demand table? Is there another table I should request from HP tuners or Will?

[Alvin]

That doesn't make a lot of sense. The only reason to breakout the baro harness is if the charge pipe / MAF is pressurized. Like a procharger or turbo. It will not be pressurized with a magnacharger.

[MeanMike]

The instructions aren’t great when they reference this breakout box and how it’s used on Global A vs B. But the Global B instruction use the wiring like normal. Engine map connector goes to the 2.5 bar and the broken out 1 bar baro is left open to atmosphere.

I’m guessing, with this global A ecu when you change from NA-MAP to SC-SCIAP-TIAP, it swaps the inputs from the map and baro (in the maf). So instead of repinning those wires, the just cross them at the connector ends. This also gets the IAT broken out so it can go post rotors. I’m just trying to make sense of what they’re doing with this.

https://www.lingenfelter.com/PDFdown...L250787219.pdf

[MeanMike]

I looked through the hardware more last night. The Lingenfelter breakout box seems to be can based. The stock maf is only 4 wires, so to get an IAT and a baro sensor out of it, it must be can. It also has an unused can connection. So, it's not quite like a 14-18 setup. I'm probably going to install the supercharger this weekend and I guess I'll plug it up and see how it all works.

I sent some questions to Lingenfelter to see if they will help with settings for this box.

[blindsquirrel]

so to get an IAT and a baro sensor out of it, it must be can.

Are there no factory diagrams for the thing you're working on? How do... how... I just...

[MeanMike]

Lingenfelter wasa little help, but they won't go into specifics because they want me to buy their locked calibration. He did say that they don't use the map sensor on the blower post rotor. So they use the factory map hooked to SCIAP space and a baro sensor broken out on the maf. IE, no positive pressure reference in their tune. So no map sensor configuration change, weird, but I guess that works with a Global A ecu. I haven't started tuning the NN yet, so I haven't seen the axis to verify, but other things I've seen it uses Load instead of pressure ratio. It's easy enough to inplug the 1 bar sciap and swap over to the 3 bar map if I want to try it that way.

Are there no factory diagrams for the thing you're working on? How do... how... I just...

The maf is just 4 wires and they call it a Multifunction Intake Air Sensor. Global B wiring diagrams look the same.

Engine Data Sensors - Pressure and Temperature.JPG