Hesitation in boost and high rpm

[AJP turbo]

     Alright....

A different tune was written by a different tuner that tuned around the issue.

Although I agree with LMS that the issue lies with the vehicle i wanted to be a bit more specific on how i improved the fuel pressure because the way its sounds it comes accross as a type of "hack" or a manipulative method to force a result.

I returned 2 throttle pedal  scalars to STOCK values...the stock calibration uses throttle control super aggressive to control load spikes...its not what I do normally thats why, along with LMS, I say its a hardwared problem ...that method is usually not needed

Control boost spikes, control fuel pressure...but usually using throttle control for the purpose of boost control makes less power and gives less feel

So basically im in agreement with LMS i just dont know if id call stock values "tuning around " the issue

The fuel system in this car does not handle boost spikes as well as other SHO's

[polskifacet]

Does that substantially effect lower output or anything very noticeable?

[polskifacet]

My point is I could care less about 10 horses if LMS can play with the above mentioned settings, and my car keep good fuel pressure. just want to be done with this whole thing lol. If the car has had the same hesitation for 30k miles , it won't change in the next 30k.

[ZSHO]

IIRC a faulty injector cannot be diagnosed with software and they usually install a boroscope by putting it inside the engine and cranking the car over.
The faulty injectors tend to leak even when not firing FYI. Z
I guess pin pointing this issue is like finding a needle in a hay stack.

[AJP turbo]

I dont remember his fuel trims being out of whack...if an injector was leaking or dumping fuel the stft would pull fuel

[polskifacet]

I'm disappointed LMS didn't do any fuel system tests, they couldn't get the hesitation to occur, but on a 3rd gear pull, I also can't get the hesitation to occur, it is always on a WOT downshift. Also LMS should have been focusing on fuel pressure which is always off spec and not an intermittent hesitation. I got the short straw because Andy was on vacation.

Sorry for the rant. I thought the LMS visit would be more fruitful. We probably will never get to the bottom of my issue, probably not worth anymore time. I emailed LMS asking them to modify my tune to match AJPs method.

[SHOdded]

Sometimes things will fall between the cracks.  Never fun being on the receiving end of it tho

[derfdog15]

https://www.injectorrx.com/direct-injection-fuel-injector-cleaning/

Might be worth looking into, and my mistake... they are in the Great State Country of Texas...

FTFY.


OP, I would suggest testing the injectors OR doing an oil analysis. If there is a leaky injector, you would likely have more fuel in the oil than you should. Just a though, as an oil analysis may be cheaper/easier to get your hands on.

[polskifacet]

I'm just going to drive it for now and monitor. As log as LMS can adjust the tune "pedal scalers", I will just wait until something fails to where is actually fails not this it 92.67% good but that 7 & 1/3% is making you hate the car and the tuner lol.

[StealBlueSho]

Maybe time for a trade in?

[polskifacet]

Maybe time for a trade in?

I am forcing myself to hold off for money "saving" reasons and keep the car for two more years. If everything is good, I'll get something more engineered to handle power, Hellcat, ctsv, gtr, z06 come to mind.

[ZSHO]

FWIW I'm hoping the personal invite is still in effect from LMS even if its for a long term period.  Z

[polskifacet]

FWIW I'm hoping the personal invite is still in effect from LMS even if its for a long term period.  Z

I'm sure they would come through, making them guess is also no fair in a sense, it would be much more efficient if another problem arose or something gets worse. I could also wait for a pump but $1500 is alot to solve an issue that should work on the stock pump and no power gain since I do no plan on upgrading turbos etc.

[StealBlueSho]

FWIW I'm hoping the personal invite is still in effect from LMS even if its for a long term period.  Z

I'm sure they would come through, making them guess is also no fair in a sense, it would be much more efficient if another problem arose or something gets worse. I could also wait for a pump but $1500 is alot to solve an issue that should work on the stock pump and no power gain since I do no plan on upgrading turbos etc.

There should be power gain with the new pump... more fuel more air means more power... not to mention running without using the throttle to control boost spikes increases power under the curve... this is proven many times over on dynos...

Whether LMS will develop a tune that way is up in the air...

I for one am planning on purchasing that pump day 1.. which should come with an updated tune since LMS says the pump will not work on a stock tune...

Curious how far they can push this new pump on their tunes.. they tend to run conservative so it will be interesting...

Not sure if this pump will solve your issues... being as your current pump is fairly "new"....

Did you have this same problem before the motor replacement?

[polskifacet]

Yes same problem before motor replacement.