Advice needed on throttle sticking/rev hang

[Aldo0280]

Haha ya no thanks man! I already have a nice borescope camera but idk if i want to leave it in my intake while i drive not to mention im not sure i would even be able to without causing a vac leak? But if the new tb i ordered doesnt fix my issue i might have to try that? Just seems weird that if my tb was bad or causing the problem then why dont i get any tb codes? Just the other day i got bored & decided to try out my gt350 cai again & it was way worse. It was literally like i had the cruise control on for like 20 sometimes 30-40 seconds before it would decel! Cant wait till my tb gets here ebay shows it should be here monday so ill definitely come back & let u guys know if it helps at all.

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[Bluemustang]

Are you gorilla tightening the TB clamp? The GT350 cai tune is cake, if your tuner can't get that right he doesn't know what he is doing or there is something wrong with the CAI.

You are GEN 2, the 350 TB is not easy to tune. You would be better off using your 80mm TB with an adapter so it fits the 350 manifold. Then the stock TB tune can be used. VMP makes a very good adapter, so do others.

If it is hanging as long as you say it should be easy to see in the logs.

Yes GT350 TB is hard to tune because of the throttle blade/angle. Tuners try as hard they can and still some has issues. Stock TB like you said.

 

[Aldo0280]

Well i got the new gt350 tb & unfortunately no change at all still has exact same rev/throttle hang issue! I emailed the tuner & hopefully they can figure it out since they have been telling me for a while now the tb was probably causing it. Anyways thanks again for the help i will update if they figure it out & if so ill try to find out what they changed incase someone might have a similar issue

 

[Aldo0280]

So not only did the new gt350 throttle body not help my rev hang issue but i also ordered a stock throttle body & an adapter to run it on my gt350 manifold & the rev hang crap is even worse the car isnt really drivable the throttle sticks & keeps acceleratiing & i have to push in the clutch for it to stop. I just dont understand what the problem is & why the tuner cant figure it out! I did throw my stock airbox on the other day & loaded the tune i have for that & no rev hang at all although it did have a weird kind of bog about half throttle or so & didnt pull quite as much probably because it was a 91 oct tune? Could that be part of the problem could running e85 cause it to rev hang? Im starting to get kinda irritated that the tuner cant figure this out im out close to $500 bucks on throttle bodys & an adapter & shipping not to mention all my time switching tbs & intakes & tunes & crap!

 

[shogun32]

although it did have a weird kind of bog about half throttle or so & didnt pull quite as much

assuming your fuel system was purged of the E85, the bog is a tuning error (or mechanical). Yes a proper E85 tune does pull stronger than a 91/93 because of more spark advance etc. A proper E85 tune doesn't hang or do anything weird. If you persist on this E85 kick, you might just want to revert to Livernois and whatever mods they expressly support. (assuming they even support <MY18)

You should be logging constantly from the sounds of it. Since the behavior is erratic.
And forget the GT350 TB and intake. The benefits are negligible.

you might want to reach to @NightmareMoon who has same gen car.

I have E85, ported TB and ported 18+ manifold, and a high flowing closed intake box

 

[Aldo0280]

The gt350 intake manifold gains are negligible? Or are u talking about the gt350 cai or airbox intake? Actually is there a specific way to install the vmp throttle body adapter? & does it matter which orientation the throttle body is installed? I never had a stock throttle body on my car so im not sure exactly how it mounts or if its even possible to mount it any other way? Im also not even positive the throttle body i got is the correct one or not? Pretty sure the only way the tb will mount is with the plug on the bottom passenger side but the vmp adapter could mount 2 diff ways & idk which one is correct or if it matters?

 

[shogun32]

I never had a stock throttle body on my car

huh? The stock one has 80mm aperture, the GT350 has 87mm - of which you now should have 2, ya? I'd have to reread 4 pages but I could have sworn you had a stock GT throttle-body and intake and a 91 tune to go with...

Throw both 87mm TB in the 'trash'. All work here on out needs to be with the 80mm GT one.

 

[shogun32]

gt350 intake manifold gains are negligible? Or are u talking about the gt350 cai or airbox intake?

all of the GT350 parts are pointless. And tuning the bitch of a TB is a well-established nightmare.

 

[K4fxd]

What CAI? With the GT350 manifold and stock TB with VMP adapter you need the stock TB tune. I hope you bought a TB for the 18 up.??

Yes stock TB with adapter, the plug is on the bottom.

Since it runs better with the stock CAI it leads me to a MAF curve problem. Tune related.

Who is your tuner?

Do you have the ability to log?

 

[Aldo0280]

So just to clear some things up my car is a 2016 & i have gt350 intake manifold, gt350 tb & stock tb now & i also have 47lb injectors, the whole reason i bought the stock tb & adapter was because everyone kept telling me there isnt much to gain with the gt350 tb & i should just get a stock tb so i did but the tuner had told me a while back that they could get my gt350 tb dialed in no problem & even if it doesnt have much gains i would prefer to run the whole gt350 setup or basically the power pack 3 setup & part of the reason for that is i live in California & was already able to pass smog through the smog referee here with that setup but without the actual power pack 3 tune calibration which i wish i had or could get without having to buy the whole kit again. But anyway since the tuner wasnt able to get the gt350 tb dialed in yet i said screw it im gonna try a stock tb & the tuner sent me a new tune for the stock tb & after installing the tb & tune the car runs even worse so i sent them an email & waiting to hear back from them but they have been great about helping me & i dont really want to blame anything on them without knowing for sure what the problem is but it sure seems to be looking more & more like a tune issue? Also are u saying there are no gains to be had running a gt350 intake manifold? Everything ive read online says they add some gains in the upper rpms? & also lets it rev a lil higher?

 

[Aldo0280]

Actually i also have gt350 cai, pmas cai & stock airbox & i have diff tunes for each & also tunes for ea with diff oct. The tuner is a well known big name tuner but more so for the f150's

 

[Aldo0280]

Srry just noticed u were confused that i said i never had a stock throttle body on my car haha i just meant that when i purchased the car it already had the gt350 tb. But after messing with it a bit more i realized that it will only mount up one way but the plug is totally diff from the gt350 tb & also the vmp adapter can bolt on 2 diff ways so i just want to make sure i didnt install smthen wrong before i go telling the tuner their tune they sent is crap

 

[shogun32]

Also are u saying there are no gains to be had running a gt350 intake manifold? Everything ive read online says they add some gains in the upper rpms? & also lets it rev a lil higher?

GT350 IM will breath a little bit better WAY up top. Maybe. There have been bakeoffs on intake manifolds and the 18+ GT OEM wins every time by a MILE.

The GT350 IM isn't the problem as such. Use the 80mm GT Throttle-Body, period. Do not use any weird CAI like PMAS. Use standard GT closed airbox that came stock. And standard gasoline tune. And make sure they have the correct injector information.

IF AND ONLY IF you have a now perfectly correct behavior, should you try for an E85 tune.

Sell the GT350 TB(s), sell the PMAS CAI, sell the GT350 CAI. There is no benefit worth a damn to any of it. And worse, they are an unending source of frustration and non-running car.

 

[K4fxd]

On a gen 2 the GT350 manifold is an improvement.

The GT350 TB, the plug is on top installed. The 80mm or stock TB has the plug on the bottom installed.

The F150's are speed density the mustangs are MAF. What you have been describing sounds like a MAF or fuel injector tuning problem. There is no way to screw up the 80mm TB it is just copy and paste from any gen 2 tune. Same with the stock or the GT350 CAI.
SCT and HP tuners do not have all parameters available to properly tune the 87mm.
Every set of LU47 injectors I have seen needs some tweaking from published data.

I'm going to assume 5 star? They try and are easy to work with but at this point I think I'd look elsewhere. If it is not 5 star I'll say the same thing, look elsewhere.

 

[shogun32]

I'm going to assume 5 star?

yeah, he copped to that back on page 2.

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