13 gt Paxton with hesitation

TargetsAppear

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I have a 13 gt with a Paxton novi 2200, ID1050x, BAP and colder NGK plugs. Also have LTH and full exhaust. I have been both Lund and PBD tuned but both tunes have a hesitation at lower rpm with slight throttle input. I have done boost leak tests, made sure the MAF was clocked properly and nothing has fixed this issue. The car runs great otherwise besides this weird issue. I have sent logs to both tuners while running their tunes and they say they can’t see any issue. Has anyone else with this or similar setup experienced this problem? If so was a solution found?
 

Juice

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I cannot give you a more definite answer than: something is not right w/tune. And you have a highly modified coyote.
From personal experience, even getting a bone stock coyote run the way it should is not easy. It took me several years of fine tuning before I was satisfied.

Suggestion: clear adaptive memory and see if the issue changes at all.
Without actually seeing the datalog of.the issue, thats the best I got. Im no coyote tuming expert by any means.But the first things I look at are STFT and LTFTs along with AFR. Sounds like you have a 'tip in' issue, but its a total shot in the dark.
 

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I cannot give you a more definite answer than: something is not right w/tune. And you have a highly modified coyote.
From personal experience, even getting a bone stock coyote run the way it should is not easy. It took me several years of fine tuning before I was satisfied.

Suggestion: clear adaptive memory and see if the issue changes at all.
Without actually seeing the datalog of.the issue, thats the best I got. Im no coyote tuming expert by any means.But the first things I look at are STFT and LTFTs along with AFR. Sounds like you have a 'tip in' issue, but its a total shot in the dark.

Thanks for the reply. I’m also no tuning expert but I agree it’s has to be in the tune and to do with the throttle tip in. I’m hoping that with all the centrifugal coyotes running around that someone has seen this issue and has had a resolution. I have done the memory clear and loaded the tune multiple times with the same issue present.
 

Juice

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I would bet the injector data is not correct. Going from memory here, but good injector data is critical. Or it will throw the tune off.
Just a thought.
 

86GT351

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Has the vehicle ever been dyno tuned? Or is this canned email tune? That is the benefit of having it on a dyno. You will be able to tell if there is a possibility of a drivability concern.
 

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Has the vehicle ever been dyno tuned? Or is this canned email tune? That is the benefit of having it on a dyno. You will be able to tell if there is a possibility of a drivability concern.

Unfortunately there is no shop that does coyote tuning near me. My tunes are both e-mail tunes with data logs sent and revisions received.
 

Juice

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I bought the SCT software so I didnt have to wait on my guy.
 

TargetsAppear

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Yeah I probably should figure tuning out which im capable of but I paid a good amount of money for someone else to do that lol. Ends up they don’t care I guess.
 

86GT351

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Unfortunately there is no shop that does coyote tuning near me. My tunes are both e-mail tunes with data logs sent and revisions received.
Is there a dyno facility near you that you can do a pull with the tuner on line and make changes on the fly? There are tuners that offer that.
 

stkjock

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Is there a dyno facility near you that you can do a pull with the tuner on line and make changes on the fly? There are tuners that offer that.
/\ this, I know Lund has done this previously with tune clients
 

redfirepearlgt

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i had a 17 pd setup that had a hesitation at light throttle when you would try to just nudge the throttle just enough to coax a downshift from od to 5th. the issue resided with fhe same two tuners. what i noticed was that throttle position actual would drop slightly and then open when this seemed to happen. it was on a larger tb howevsr so i wrote it off as a querk to live with though i had never had the issue with 3 previous pd setups. my current lund tune with a 2200 novi does not have this issue on my most recent 14 with stock tb. if you are running a larger tb this may be part of the issue. as well you could look at knock data to see if you have an6 false knock at tip in wh8ch could also contribute to this theoretically. so observe tp actual vs tp commanded and then observe knock retard vs spark advance. may help.
 

TargetsAppear

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I didn’t see any knock in any of the logs I have done so far but I will look at that throttle position. Thank you. You would think that either of these tuners would see that and say something though.
 

86GT351

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i had a 17 pd setup that had a hesitation at light throttle when you would try to just nudge the throttle just enough to coax a downshift from od to 5th. the issue resided with fhe same two tuners. what i noticed was that throttle position actual would drop slightly and then open when this seemed to happen. it was on a larger tb howevsr so i wrote it off as a querk to live with though i had never had the issue with 3 previous pd setups. my current lund tune with a 2200 novi does not have this issue on my most recent 14 with stock tb. if you are running a larger tb this may be part of the issue. as well you could look at knock data to see if you have an6 false knock at tip in wh8ch could also contribute to this theoretically. so observe tp actual vs tp commanded and then observe knock retard vs spark advance. may help.
Shouldn't a quality tuner be able to compensate the the Throttle Body size though?
 

Juice

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Shouldn't a quality tuner be able to compensate the the Throttle Body size though?
Unless they have known good data on the TB, not really.
Logging ETC errors can answer that question though.
 

crjackson

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Pretty sure Shaun@AED Tuning has dealt with this exact issue before, and he does remote tuning. I haven’t used AED myself, but I have friends who swear by his boosted Coyote tunes.

Give him a phone call. He’ll let you pick his brain (so I’ve been told).
64F56E00-BC7A-4764-8EEE-0ACA74A080F1.jpeg
 

TargetsAppear

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Imagine spending 2k plus on tuning and having a car that’s not 100% ironed out. I know it’s not a mechanical issue because I have been through everything on this car. Boost leak tested with smoke machine; new ford factory maf, plugs gapped to correct spec with proper tool and feeler gauges, all new ford o2 sensors, MAF clocked the proper way. No knocking or fueling issues.
 

86GT351

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Imagine spending 2k plus on tuning and having a car that’s not 100% ironed out. I know it’s not a mechanical issue because I have been through everything on this car. Boost leak tested with smoke machine; new ford factory maf, plugs gapped to correct spec with proper tool and feeler gauges, all new ford o2 sensors, MAF clocked the proper way. No knocking or fueling issues.
2K on tuning and there is no dyno? I'm sorry but that is excessive in my opinion.
 

Juice

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2K on tuning and there is no dyno? I'm sorry but that is excessive in my opinion.
Not really, a remote tune runs about $650. OP had two different tuners do tunes.
To compare, self tuning will run about $750, and there is a huge learning curve.
Tuning isnt "cheap" like in the OBD 1 days.. And it wasnt that much cheaper. lol
 

redfirepearlgt

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it does appear that remote tuning regardless of who you attempt to work with these days has become more difficult. the best experience i ever had remote tuning was with alex when he was at vmp performance. he would actually return calls. that car was the best dialed in automatic setup i ever had.

these days to get anything done that needs tuning attention after the car is back in the real world ie datalogs at the track or while driving, i have to take the car back because there is always a mechanical or gas issue they fall back on rather than call you and try to work the problem. this will be my last build.
 

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