E85 tuning with DHP

[BoostedPontiac]

I read through the 2 tuning guides but i have some questions.

1.)So my base tune will be setup to start logging just by changing the Injector Skew Percent to 1.2-1.3? Is there anything else involved with this?

2.)If the above is true and my LTFTs are within 10%, Ill be good to go?

 

[BoostedPontiac]

Anyone?

 

[Scottydoggs]

its the injector flow rate you need to increase for the larger injectors.

injector skew should be at 100% i think.

 

[BoostedPontiac]

Ive already done that for my injectors. I was using the "defacto guide for tuning e85" and it mentioned bumping the skew to 1.2-1.3 depending on the time of year.

 

[BrandonHall10]

I have my IFR true to the size of the injectors. My skew is 1.3125 across the board. LTFT and STFT are within 5% all the time. Haven't done a MAF tune yet.

 

[Scottydoggs]

the skew is 1-100% in dhp.

most of the e85 tuning talk is hp based i think. what they are changing maybe somewhere else in dhp.

 

[BrandonHall10]

Oops. Missed the DHP part...

 

[Scottydoggs]

i knew that 1.2 stuff didnt jive with dhp lol

 

[BoostedPontiac]

The max value on the Injector Skew Percent in DHP is 200. Unless youre saying that the PCM doesnt like anything over 100.

 

[Scottydoggs]

your right, it will go as high as 200%

not sure how that cross's over from hp to dhp tho.

 

[BoostedPontiac]

I guess there is only one way to find out.

 

[Scottydoggs]

this is derricks injectors off the regal board. i forget what injectors he has but this is what he started out with, trims were a bit off.

i added a zzp pe file to his bin and it came out pretty damn close, if it was a canned tune you could not be happier with the trims really, but i did adjust them a bit since the fuel trims re learned.

 

[Scottydoggs]

thats for 60 lb injectors, just looked through our emails.

 

[BoostedPontiac]

Based on what i see there, he may have 60# injectors

 

[Scottydoggs]

i ninja'ed ya, yes 60's

 

[timboku]

I used 131 percent on dhp and it worked fine. .trims within 2 percent on my 60s

 

[91parkave]

You guys and fuel trims....Jesus unless you have a wide band you really are setting yourself up for failure. Just cause it runs "fine" doesn't mean all your data is really correct. E85 has a wide operating range but you should always look for what your actual afr/lambda is and tune off that. Not a narrowband.

 

[BoostedPontiac]

After talking to a better tuner, i decided to take his advice and use the injector flow rate. Ill be using 60# injectors so ill get them dialed in then add 28-32% so they flow more.