Updated 2 Bar map question

[HartRod]

I just updated my P59 ECM with a 2 bar map sensor and am trying to set up the gauge and histogram on the scanner correctly. Attached is the tune, a log and the config file. Does it look like I set it up correctly? TIA

[mowton]

Scalar looks about right. Is it a stock cam? What was the idle MAP before you changed the sensor. It is 33-35 kPa now, if the same then looks good to go. A WOT stab should hit close to Barometric atmosphere.

Normally you can perform a Key On Engine Off scan and the MAP should read Baro but I have found on the Enhanced OS's, that test doesn't work. MAP readings only start after car has been started, but give it a go anyways.

Ed M

[HartRod]

Scalar looks about right. Is it a stock cam? What was the idle MAP before you changed the sensor. It is 33-35 kPa now, if the same then looks good to go. A WOT stab should hit close to Barometric atmosphere.

Normally you can perform a Key On Engine Off scan and the MAP should read Baro but I have found on the Enhanced OS's, that test doesn't work. MAP readings only start after car has been started, but give it a go anyways.

Ed M

Thanks Ed. It's a stock 5.3/4L60E with a Magnacharger MP112, Delphi 17113739 Marine injectors and Doug Thorley TriY headers. It was reading 33-35 prior to the OS update but I wasn't getting any Baro reading with KOEO, so I thought I might have messed something up. Any other suggestions/recommendations? The scan was with open headers. Getting the exhaust put on this Friday.

[5FDP]

Because it's a 2 BAR OS now, I assume you are doing away with the MAF right?

You'd want to setup the rest of the tune for speed density too.

[HartRod]

Because it's a 2 BAR OS now, I assume you are doing away with the MAF right?

You'd want to setup the rest of the tune for speed density too.

Actually I plan on keeping the MAF. It's going to be a driver and I would like to take advantage of all the built in EFI systems.

[HartRod]

Looks like the new 2 bar MAP is reading correctly, but I keep getting a pending P0101 error. I didn't have the error prior to upgrading the OS and the MAP sensor. Any suggestions? TIA

[HartRod]

Scalar looks about right. Is it a stock cam? What was the idle MAP before you changed the sensor. It is 33-35 kPa now, if the same then looks good to go. A WOT stab should hit close to Barometric atmosphere.

Normally you can perform a Key On Engine Off scan and the MAP should read Baro but I have found on the Enhanced OS's, that test doesn't work. MAP readings only start after car has been started, but give it a go anyways.

Ed M

Ed it looks like everything is working OK with the MAP. Could the fact that the Enhanced OS does not read the BARO on KOEO cause a P0101 pending code to show up on the DTC list? Thanks,

Rob

[RonSSnova]

You can get the map to show Baro by cranking the engine but not starting it while the scanner is logging.
Easiest way is to shut off the fuel pump.

[HartRod]

You can get the map to show Baro by cranking the engine but not starting it while the scanner is logging.
Easiest way is to shut off the fuel pump.

Thanks Ron. The MAP sensor is working fine once started, but I think the computer is looking for it with KOEO and is placing a P0101 pending in the DTC because it doesn't see it (I'm not getting a CEL, I just see a pending in the DTC list).

On a different note, when I went to the 2 Bar MAP OS, the upgrade took the original VE table and spread the numbers in there from 30-210 KPA. I'm guessing I need to put the original numbers in there from 15-105, and then just replicate the numbers from 105 to 210 initially, and then update the numbers in the upper end as build my new VE? You can see what I'm talking about in the tune above. Thanks for the help.

[RonSSnova]

Hey, sorry to be slow to respond.
That's a really small VE table. I'm not a fan of the P59 for that reason........

If those are the same numbers that appeared in your orig VE table, here is what I would do.

Open your orig tune in another window. Then copy the rows that match from 30-100 into your new table.
Next copy the 100kpa row into the 210kpa row.
Highlight that row and multiply by 2.
Then highlight all the rows from 100 to 210 and interpolate between vertical bounds.

The theory is that you need approx. 2x the fuel at 15 psi as you need at 0 psi WOT.
A little crude, but it works.

For a turbo car, I'm not liking your PE Throttle/Pedal settings.
You have it set to 90%. Your car will make boost at much lower throttle openings and you will not go into PE mode.

I would also set your PE EQ ratio table to 1.34 across the board for your initial tuning. This will tell the engine to achieve 11:1.
Then tune your VE table so it hits that number on the wideband.
Ditto for your MAF, although I don't think the custom OS is designed to use the MAF........

Finally, set the Boost Enrichment table to match PE EQ ratio table. Boost enrichment really doesn't respond fast enough to be worthwhile.
PCM will default to the richer of the two tables, so I match them just in case.

Ron

[HartRod]

Thanks for the reply Ron! What other choice do I have other than a P59? Here's the new tune with all of your suggested updates. When you have time, let me know what you think. Also, can I still use my MAF since I updated to the Custom OS? The only reason I updated it was because it was suggested that I should upgrade to a 2 bar map because of the Magnacharger. Thanks again and take care,

Rob

OBTW, updating the VE took care of the P0101 error.

[RonSSnova]

Looks good. Now you have a base to tune from.

Was this tuned previously before you added the blower? or is it a new combo?
Is it still a 5.3? I'm betting not.... :-)

HPT states that the Enhanced 2bar OS is speed density only. If someone has proven it to work in MAF only mode, maybe they can chime in.

Are you going to run this open or closed loop?

Since you have a blower as opposed to a turbo, your combo will make boost according to the pulleys chosen. So your boost will be quite fixed and consistent.
For that the P59 is fine.
The P01 would give a bigger table which makes tuning a bit easier as you get more kpa rows to tweak.

Turbo setups that have a boost controller can run any boost you like. So it's nice to have more rows to tune.

[HartRod]

Looks good. Now you have a base to tune from.

Was this tuned previously before you added the blower? or is it a new combo?
Is it still a 5.3? I'm betting not.... :-)

HPT states that the Enhanced 2bar OS is speed density only. If someone has proven it to work in MAF only mode, maybe they can chime in.

Are you going to run this open or closed loop?

Since you have a blower as opposed to a turbo, your combo will make boost according to the pulleys chosen. So your boost will be quite fixed and consistent.
For that the P59 is fine.
The P01 would give a bigger table which makes tuning a bit easier as you get more kpa rows to tweak.

Turbo setups that have a boost controller can run any boost you like. So it's nice to have more rows to tune.

Ron, I really appreciate you taking your time to look at this as I'm just a novice tuner that usually helps guys out doing LS conversions in older vehicles (delete VATS, 02's, gears...just minor tweaking).

The motor is jus a stock 5.3/4L60E out of a 2006 Tahoe. It only had 10 miles on it when I purchased it. I've been working on this project (69 Suburban) off and on for over 11 years.... and just recently got it running. The only changes I have made are, adding the MP112 Magnacharger, 8.1 43# marine injectors, 2 Bar MAP, Doug Thorley 1-5/8" Try Y headers, and a Corvette servo in the transmission. My goal was to build a very dependable driver that I could pull a small airstream camper without any problem.

I'm confused a little on the 2 BAR MAP upgrade. I wasn't planning on doing away with the MAF as I want the truck to function as close to stock as possible. How would you not do a custom OS and still account for the supercharger going into boost? My apologies if this is a dumb question, as stated above, I'm just a novice . Take care and thanks again.

Rob

[RonSSnova]

Sweet Suburban! I like it!

There is no need to keep the MAF.
These engines run very nicely in Closed Loop Speed Density mode.
The engine being stock will ease the tuning considerably.
You will need a wideband to do the wide open tuning.

BTW, I tune a lot of Dodges. They are all speed density.

When will you be ready to do the tuning? Looks like you still have a ways to go before driving it.

[HartRod]

Sweet Suburban! I like it!

There is no need to keep the MAF.
These engines run very nicely in Closed Loop Speed Density mode.
The engine being stock will ease the tuning considerably.
You will need a wideband to do the wide open tuning.

BTW, I tune a lot of Dodges. They are all speed density.

When will you be ready to do the tuning? Looks like you still have a ways to go before driving it.

Thanks Ron. I've been driving it around on the backstreets a little bit. I still need to put the front clip on it and then I can do the wideopen throttle tuning. And I do have a wideband.

[RonSSnova]

Be glad to help you when you get to that point.

[HartRod]

Be glad to help you when you get to that point.

Thanks Ron. I'll let you know when I get to that point. Take care and Happy Holidays.

[HartRod]

Ron - took the burb for a quick ride around the neighborhood. Here's the tune and the datalog. Will be adding the wideband and fenders soon!

[HartRod]

New log and tune. Can't figure out why when I punch the throttle, the PCM is pulling so much timing. Look around 11:50.

[5FDP]

To me it's how you have you timing tables setup. You still have it going into negative timing when cylinder volume is over 1.00 and even before that. You also have the spark correction tables like IAT table pulling timing and the AFR correcting table pulling timing on you.

Adjust your timing and disable those other tables from pulling spark. You really need to tune your VE still, it's used during transient fueling like when you get into boost even with it using the MAF. Having it just be a wall of 100's above 100kpa doesn't help.

I'd honestly just removing the MAF altogether and run the speed density OS like true speed density. But atleast setup the tune for speed density, tune the VE so it's atleast smooth and can give you accurate fueling once in boost.