Anyone have this issue - Throttle not reading 100%

Exgermanowner · 04-10-2019, 09:54 AM

The issue - my car on the road course will not read 100% throttle in either the Cosworth charts or PI Toolbox. It was reading like 96.5% this past two days. In one area of the track does it read 100%, but not consistently. YES my foot is buried through the floor board. This has been going on for the three events I've done in the car.

So i had it at the dealer last week prior to the last event which was just this week (Mon/Tues)and they said they did a software update and replaced the black piece on the side of the throttle body that my buddy and I call BS on. On my way home that evening I recorded two full throttle runs after the car was warm and it displayed 100%, but not at the track.

My buddy who is a fellow member on this board and has the same car except being a 17', we stuck his memory card in yesterday while at the track and it shows 100%. I also have a file from another friend with an 18' from an event we all three did in November and his shows 100%. We also took a spare stock throttle body and put it on my car, yesterday I ran a session and nothing. Still not registering 100%.

The dealer didn't bleed the system despite my request(they move a lot of vettes)and the guy i deal with is their vette guy and he knew about the LT4 air in the system issue, so that ticks me off in hindsight and wasn't happy at the time they didn't do it. Their reason was the tech determined it wasn't necessary due to the software update.

My car is bone stock btw.

So just wondering if anyone else has run into this. We're thinking its in the drive by wire pedal assembly at this point, maybe air in the system.

Gonasurvive · 04-10-2019, 01:50 PM

Only asking because I see no mention of it, are you running the same nanny setting (aka Touring,sport,track) as your friends? From my understanding is that the different settings can affect this as well.

Exgermanowner · 04-10-2019, 02:16 PM

Good thought, but we're all running it in the track setting mode Sport 1 back in November I believe, so all equal. This past couple of days I stayed in Sport 1 and he was sport 2, so that should rule out full throttle on the straights.

Gonasurvive · 04-10-2019, 04:59 PM

I just watched a couple of my 1/4 mile recording, it registered at Full throttle at 100% even with wheel spin and Touring Mode. Something is off on your car for sure, hopefully someone else can chime in, to help.

Exgermanowner · 04-11-2019, 10:45 AM

TTT

Exgermanowner · 04-12-2019, 06:50 AM

TTT - Really? I'm the only one in this boat. Figures, that's my luck.

*radz28* · 04-12-2019, 08:45 AM

I believe this isn't necessarily uncommon. It might depend on what software you're monitoring with. I know you said you were using something, but can tell you that I use HPTuners, and even with the foot floored, the throttle can still register less than 100%. I'm not sure if that means the actual blade is less than 100%, or that's just how it's registering in the software, but it might not be that big a deal.

Exgermanowner · 04-12-2019, 09:10 AM

I won't argue as that can be valid, but I'm viewing it through the provided GM Cosworth tool and the Pi Tool box which is just another software to view the data from the car. Also my terminal speeds are down compared to almost identical cars and exit speeds in the preceding corner. I'm also reading the same PDR files of those referenced cars on the same software and they show 100%.

Aliveguy5 · 04-12-2019, 09:35 AM

We're your friends pulling away from you on the straights?

Exgermanowner · 04-12-2019, 09:36 AM

Quote:

Originally Posted by Aliveguy5

We're your friends pulling away from you on the straights?

Yes

staples87 · 04-12-2019, 10:05 AM

Could it be associated with the torque management tables in the stock tune slightly closing the blade or maybe even bad gas?

Exgermanowner · 04-12-2019, 10:30 AM

The first I agree with, anything is possible. As I stated the dealer said they did a software update, to what I don't know. The 2nd, no, all the cars I'm referencing, we're all running the same gas from the VIR pumps.

BlueinTN · 04-12-2019, 07:04 PM

My small experience is you never see 100% maybe 88% is the highest I remember looking at my SRT Jeep with the torque app. I dont think my Chnallenger read past 80%.

Most TB I have tested run .5 VDC to 4.5 VDC.

If my OBD bluetooth will work on my Camaro ill see if I can see it in Torque sometime.

04-10-2019, 09:54 AM	#1
Exgermanowner Drives: Bone stock Join Date: Nov 2017 Location: Elon, NC Posts: 115 View My Garage	Anyone have this issue - Throttle not reading 100% The issue - my car on the road course will not read 100% throttle in either the Cosworth charts or PI Toolbox. It was reading like 96.5% this past two days. In one area of the track does it read 100%, but not consistently. YES my foot is buried through the floor board. This has been going on for the three events I've done in the car. So i had it at the dealer last week prior to the last event which was just this week (Mon/Tues)and they said they did a software update and replaced the black piece on the side of the throttle body that my buddy and I call BS on. On my way home that evening I recorded two full throttle runs after the car was warm and it displayed 100%, but not at the track. My buddy who is a fellow member on this board and has the same car except being a 17', we stuck his memory card in yesterday while at the track and it shows 100%. I also have a file from another friend with an 18' from an event we all three did in November and his shows 100%. We also took a spare stock throttle body and put it on my car, yesterday I ran a session and nothing. Still not registering 100%. The dealer didn't bleed the system despite my request(they move a lot of vettes)and the guy i deal with is their vette guy and he knew about the LT4 air in the system issue, so that ticks me off in hindsight and wasn't happy at the time they didn't do it. Their reason was the tech determined it wasn't necessary due to the software update. My car is bone stock btw. So just wondering if anyone else has run into this. We're thinking its in the drive by wire pedal assembly at this point, maybe air in the system. __________________ 2018 ZL1 - Garnet Red, NO Sunroof, A10, PDR, Carbon hood insert = Perfect

04-10-2019, 02:16 PM	#3
Exgermanowner Drives: Bone stock Join Date: Nov 2017 Location: Elon, NC Posts: 115 View My Garage	Good thought, but we're all running it in the track setting mode Sport 1 back in November I believe, so all equal. This past couple of days I stayed in Sport 1 and he was sport 2, so that should rule out full throttle on the straights. __________________ 2018 ZL1 - Garnet Red, NO Sunroof, A10, PDR, Carbon hood insert = Perfect

04-11-2019, 10:45 AM	#5
Exgermanowner Drives: Bone stock Join Date: Nov 2017 Location: Elon, NC Posts: 115 View My Garage	TTT __________________ 2018 ZL1 - Garnet Red, NO Sunroof, A10, PDR, Carbon hood insert = Perfect

04-12-2019, 06:50 AM	#6
Exgermanowner Drives: Bone stock Join Date: Nov 2017 Location: Elon, NC Posts: 115 View My Garage	TTT - Really? I'm the only one in this boat. Figures, that's my luck. __________________ 2018 ZL1 - Garnet Red, NO Sunroof, A10, PDR, Carbon hood insert = Perfect

04-12-2019, 08:45 AM	#7
radz28 Petro-sexual Drives: Ultra-Grin Join Date: Oct 2006 Location: Crazy Coast Posts: 15,855 View My Garage	I believe this isn't necessarily uncommon. It might depend on what software you're monitoring with. I know you said you were using something, but can tell you that I use HPTuners, and even with the foot floored, the throttle can still register less than 100%. I'm not sure if that means the actual blade is less than 100%, or that's just how it's registering in the software, but it might not be that big a deal. __________________ '20 ZL1 Black "Fury" A10, PDR, Exposed CF Extractor Magnuson Magnum DI TVS2650R // RFBG // Soler 103 // TooHighPSI Port Injection // THPSI Billet Lid // FF // Katech Drop-In // PLM Heat Exchanger // ZLE Cradle bushings // BMR Chassis-Suspension Stuff // aFe Bars // Diode Dynamics LEDs // ACS Composites Guards // CF Dash // Aeroforce // tint // other stuffs

04-10-2019, 01:50 PM	#2
Gonasurvive Drives: 17 ZL1 MBM M6 Join Date: Mar 2017 Location: Oregon Posts: 101	Only asking because I see no mention of it, are you running the same nanny setting (aka Touring,sport,track) as your friends? From my understanding is that the different settings can affect this as well.

04-10-2019, 04:59 PM	#4
Gonasurvive Drives: 17 ZL1 MBM M6 Join Date: Mar 2017 Location: Oregon Posts: 101	I just watched a couple of my 1/4 mile recording, it registered at Full throttle at 100% even with wheel spin and Touring Mode. Something is off on your car for sure, hopefully someone else can chime in, to help.

04-12-2019, 09:10 AM	#8
Exgermanowner Drives: Bone stock Join Date: Nov 2017 Location: Elon, NC Posts: 115 View My Garage	I won't argue as that can be valid, but I'm viewing it through the provided GM Cosworth tool and the Pi Tool box which is just another software to view the data from the car. Also my terminal speeds are down compared to almost identical cars and exit speeds in the preceding corner. I'm also reading the same PDR files of those referenced cars on the same software and they show 100%. __________________ 2018 ZL1 - Garnet Red, NO Sunroof, A10, PDR, Carbon hood insert = Perfect Last edited by Exgermanowner; 04-12-2019 at 09:28 AM.

04-12-2019, 09:35 AM	#9
Aliveguy5 Drives: 2017 Red Hot ZL1 Join Date: May 2015 Location: Metro Detroit Posts: 216	We're your friends pulling away from you on the straights?

04-12-2019, 10:05 AM	#11
staples87 Drives: 2017 Camaro ZL1 Join Date: Aug 2018 Location: Bel Air, MD Posts: 319	Could it be associated with the torque management tables in the stock tune slightly closing the blade or maybe even bad gas?

04-12-2019, 10:30 AM	#12
Exgermanowner Drives: Bone stock Join Date: Nov 2017 Location: Elon, NC Posts: 115 View My Garage	The first I agree with, anything is possible. As I stated the dealer said they did a software update, to what I don't know. The 2nd, no, all the cars I'm referencing, we're all running the same gas from the VIR pumps. __________________ 2018 ZL1 - Garnet Red, NO Sunroof, A10, PDR, Carbon hood insert = Perfect

04-12-2019, 07:04 PM	#13
BlueinTN Drives: gas powered Join Date: Jan 2019 Location: TN Posts: 325	My small experience is you never see 100% maybe 88% is the highest I remember looking at my SRT Jeep with the torque app. I dont think my Chnallenger read past 80%. Most TB I have tested run .5 VDC to 4.5 VDC. If my OBD bluetooth will work on my Camaro ill see if I can see it in Torque sometime.

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