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Hiccup At WOT

Posted: August 30th, 2022, 4:13 pm
by kwambe5
Hello fellow VersaTuners!
I have a map that I have developed from a combination of my old 93Oct and some of the stock tables that come with Versatune that I have used to develop a CST4 map for E30 mix. I have recently been having a slight hiccup under WOT, usually at higher gears/speeds. I cannot seem to see in my logs unless I am missing something that you people who have more experience can see.

Mods are as follows; Corksport - HPFP, EBCS, TMIC, 3" Intake (w/corresponding MAF cal), 3" downpipe, CST4 turbo, TMM insert, RMM. Self-made 3" exhaust, EGR delete, dual catch can setup, Damond PMM and short shift plate, SURE Rear differential mounts and weighted shift knob,

Re: Hiccup At WOT

Posted: August 31st, 2022, 1:47 am
by mituc
We don't have your tune to confirm this but it looks like boost cut 100%.

Re: Hiccup At WOT

Posted: August 31st, 2022, 11:58 am
by kwambe5
Here is my tune in its current form.

Re: Hiccup At WOT

Posted: September 1st, 2022, 12:11 am
by mituc
Ok, so I looked again at the logs and correlated with the tune.
It looks like things start to oscillate when the injector duty cycle exceeds 100%.
With those target AFRs, ignition timing, boost limits and spool strategy you will kill that turbo pretty fast.

Re: Hiccup At WOT

Posted: September 1st, 2022, 2:50 am
by kwambe5
Ok, are there changes that you would recommend? Reduce load desired and back off the timing?

Re: Hiccup At WOT

Posted: September 1st, 2022, 3:14 am
by mituc
Considering how the tune looks like I'd change it all. At this point hiring an e-tuner would not be a bad move at all.

Re: Hiccup At WOT

Posted: September 1st, 2022, 5:17 am
by kwambe5
Gotcha! Thanks

Re: Hiccup At WOT

Posted: August 14th, 2024, 9:58 am
by a13xman
i am also having this same issue as well as a weird idle i did a log startup when disconnecting the maf then connecting it do you spot anything odd?

Re: Hiccup At WOT

Posted: August 15th, 2024, 12:42 am
by mituc
a13xman wrote: August 14th, 2024, 9:58 am i am also having this same issue as well as a weird idle i did a log startup
Post a log. List your mods. State which OTS tune you're using or post the tune (only if it's made by you. do NOT post it if it's made for you by a professional tuner as a paid service or stated otherwise as non-public information).