c5 flex fuel questions
So i got around to trying this out. I got my P59 from a 04 tahoe, i took the red covers off the connector and swapped on the green. I had to move the wire from green 52 to green 75 for the alternator f terminal. I did a segment swap with a 04 z06 and brought over my injector data, idle settings, ve, maf and spark stuff over to the p59 pcm. I deleted all the o2 heater and sensor 2 DTCs and did a pcm / bcm relink. The car starts, idles and everything with the TB seems to be working fine. I didnt do all of this at once it took some time and trial and error to figure out what it wanted but thats all i had to do. I also havnt driven the car so if something different happens during driving i wouldnt know yet. I also have not hooked up a flex fuel sensor yet, it should be here in a couple days. Hopefully everything will work with that. Honestly even if it dont work swapping to the p59 is worth it to me because the newer faster pcm controls the idle of my big cam much better.
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The PCM swap is very easy and im still tuning but so far it is coming along great. Problem is i have the flex fuel sensor plumbed, wired into the pcm and flex fuel is turned on in the tune but it is not reading alcohol percent. I have not messed with the flex fuel part any more yet but when i get the 93 tune down solid i will start messing with it again. I have been talking with some shops that have done this and he has figured it out by adding parameters with the user defined parameters in hp tuners but i havnt messed with it much after. Anybody know how to mess with this user defined parameters stuff?
The PCM swap is very easy and im still tuning but so far it is coming along great. Problem is i have the flex fuel sensor plumbed, wired into the pcm and flex fuel is turned on in the tune but it is not reading alcohol percent. I have not messed with the flex fuel part any more yet but when i get the 93 tune down solid i will start messing with it again. I have been talking with some shops that have done this and he has figured it out by adding parameters with the user defined parameters in hp tuners but i havnt messed with it much after. Anybody know how to mess with this user defined parameters stuff?
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From: Tree-Hugging, Bug eating CALI'
First - Thank You to everyone who's posting and sharing. I've learned so much from this thread. I've read it several times, too, to try to find the answer to the question below, but I can't, personally, find a direct answer to the quote below:
Does anyone know the answer to this? My table is pretty much the same, and I see from logs that this table doesn't completely cover the range of the airmass I'm logging, and I'm wondering if, like the quote asks, if just carries the last values?
Thank you all for one of the most useful threads.
- Chuck
I see the Flex Fuel spark table only goes to .88 cylinder air. What happens to the spark timing when using the 2 or 3 bar OS? When you hit the bottom of this table does it continue to carry that spark advance over to the high octane table?
I have the 3.24 version of HPTuners and the Blend Factor table does not show up.
I have the 3.24 version of HPTuners and the Blend Factor table does not show up.
Thank you all for one of the most useful threads.
- Chuck
Last edited by radz282003; Apr 11, 2018 at 09:34 AM.
I have a question that's been bugging me and I need answered. When switching to a different OS I know you copy and paste general things like your 'VE and spark tables but what about tables like IAC effective area, IAC park position, Startup Airflow and Afterstart enrichment, basically your startup fuel and idle tables. Do you move them over to the new OS or use the tables that's in the new file? I'm sure this would help a lot of people including myself. I've made the switch from 156 OS to the 125 Flex Fuel OS and want to know if i should of used the Flex IAC and other idle tables.
Last edited by Monte4ever; May 12, 2018 at 11:37 PM.
Just like to update everyone with this. I got everything to work on my car while retaining the factory DBW TB. I'm running e70 right now and it's adding and subtracting timing as it should. Works great.
