On my 15 Z51 7MT, sometimes a relatively light tap of the throttle will rev the engine, and sometimes it feels like the car has barely acknowledged that you pressed the gas pedal at all.

this isn’t an issue of drive mode - the car is pretty much always in Sport.

anyone else experience this? any suggestions? It’s been driving me crazy, and happens both in gear and in neutral. Thanks!

 

The C7 throttle butterfly tip-in being mushy and indistinct when starting from a stop is a common complaint. This may or may not be what you've described, but I stalled my C7 M7 more times in the first six months than I have in 50 years of driving manual transmission cars.
A common solution to fix the mushy response is to install the Soler throttle body and throttle controller. There are a number of CF threads on the topic.
Soler website is at https://www.solerengineering.com/

 

thanks for the info! How difficult a job is the throttle body?

 

Throttle body is a very easy installation that anyone can do, can be done in 30 minutes or less. I have never installed the controller so I really don't know about it.

 

controller is easy peasy you have to pull off the gas bedel and insert a unit inbetween the pedal wires and the cars controller. then calibrate it. beware though if the car is driven hard the computer goes into a different fuel map and the car will through a code and go into limp mode. Vitesse makes a controler as well although solers is less expensive and has better support.

 

I definitely drive my card hard at times, so maybe the controller isn’t for me - don’t want constant codes and limp home mode. Does it do this even if correctly calibrated?

maybe I’ll look into the throttle body upgrade

 

A Soler throttle body upgrade would be the first thing on my list if not for it killing my extended warranty. For me, it seems any wire controlled gas petal has the same issue. My MB C350 had the same issue.

Like others have stated, I also think installing the Soler throttle body would help with your issue. The controller is just gravy.

So bottom line... If you have a GM extended warranty, they may not pay for any work if they find it on your car. Dealer results may vary.......

 

As posted the throttle body is a simple job and the throttle controller is equally simple, if a bit of a Yoga exercise. The TC has several increasing sensitivity modes, with a number of "fine tuning" settings in each sensitivity mode, which allows you to pinpoint and set the throttle response you want, from dope smoking turtle to SST. It also includes an OEM mode that sets the TC to factory settings to remind yourself why you bought the unit

AFAIK the TB/TC leave no "fingerprints" on the OBD, and both can be easily removed/replaced with the OEM parts for service if desired.
Mike at Soler can answer any questions that you have and is a prince when it comes to customer service.
Mike sends installation, calibration and operation instructions with both the TB and TC. Probably way more info than you need, but....
If you have the required tools on hand, figure
For the TB, no more than an hour from entering the garage to lights out and door closed..
For the TC, skinny, flexible owners can do the complete install in under a half hour... For the rest of us, figure 1 to 1.5 hours. Add time as necessary for cursing and sipping a brewski for attitude adjustment.
On my '19 Stingray for the TB I used

• 10 mm socket for the four bolts securing the TB
• 8 mm socket or large flat blade screwdriver for the clamp holding the air duct on to the TB intake.
• Short wobbly extension to make removing the lower bolts easier. The driver side lower bolt is behind the control module and requires tactile locating. The passenger side lower bolt is more accessible but the wobbly extension makes accessing it easier.

For installing the deceptively simple TC, being blessed with diminutive size and flexibility are a plus as you will be working on the throttle pedal in tight spaces. Practicing your favorite %^*&^&@!#* curses ahead of time will save a few seconds here and there...

• A 10 mm socket with the wobbly extension makes removing the throttle unit hold down screw easy. It is a REALLY long screw, which makes it easier to reinstall, and took many more turns to remove than I expected
• When I disconnected the throttle connector, after sliding the red locking guard clear, after struggling to pull the connector apart I discovered the locking tab on my throttle unit connector was stuck in the engaged position and needed to be lifted clear with an awl
• Reinstall throttle unit, route the wire and locate the display as desired
  • I put industrial strength velcro on the back of the electronic unit and stuck it to the carpet behind and above the throttle pedal and ran the wire behind the carpet to the display unit velcroed immediately to the left of the A/C temp ****.

https://www.corvetteforum.com/forums...post1602493711
https://www.corvetteforum.com/forums...post1602491504
https://www.corvetteforum.com/forums...post1602662247

 

thanks for the detailed info and the generally entertaining post! I’ll probably start with the TB once the weather warms up a little and then see if I need the TC or not. Thanks again!

 

Do them both and don't look back!

 

Took me a while to agree with this route. Was showing the granddaughter how the car accelerated from 10mph starting. There was always that pause when gas pedal applied aggressively. Did the TB and TC from Soler. It would be like taking a tame saddle horse and replacing it with a spunky spirited youngster. A blast to drive and you can make it as aggressive as you can handle. Even in OEM mode, the tip in issue is mostly gone. I think my learning stage is over after driving in town for a while. Got a code after the first start which went away after disconnecting and reconnecting the battery. No codes since.

If nervous about warranty issues, based on the issues you can easily reinstall the OEM stuff in under 30 min.

Dave

 

Suggest doing the TB first then the TC to observe the differences with them.
The TB vastly improves the low end throttle mushiness, and the TC allows you to obtain the throttle response you find best for your driving style.

 

Installing the Soler TB and TC is some of the best money I've ever spent on my Corvettes. You will wonder why GM didn't provide this technology in the first place.

 

While the Soler products do solve a big problem on these engines, I'm not 100% convinced your problem is the one it solves. Normally the throttle response right off idle is "consistently" sluggish with a throaty sound of the engine sucking air. It's pretty consistent. What you're describing sounds like it varies. I'd call Soler and explain the issue before spending your money. He's a very knowledgeable and helpful guy. It's possible you may have a problem with the sensor on your gas pedal. There was a good thread about this in the past.

Found the thread:

https://www.corvetteforum.com/forums...-idle-bog.html
.

 

His problem could also be a perception caused by the NPP system. With the flaps open you get a certain note and rumble when blipping the gas pedal. If you do this same exact thing and the flaps have been closed, you get a different note and feel. It feels like and lag of sorts because you don't get the same response. I think it will be same on the RPM gauge though.

The Soler products add consistency and response regardless of the driving mode. But it does feel different with the Mild to Wild switch always in Wild with or without Soler products.

 

thanks! I do have NPP but that’s not the issue. In fact, even with the exhaust in track mode and the car in neutral, sometimes I’ll hit the gas pedal and NOT hear the engine rev very much at all. Other times, I hear it rev as expected.

 

Get a can of throttle body cleaner and while holding revs up spray the throttle body valve plate.

 

I know a lot who have the TC and don't have issues when going WOT. The people who's cars I've seen go into limp mode and throw a code are ones who either didn't install it correctly, or ones who have a defective part. And with Soler's amazing CS, they'll make it right for you regardless.

 

I've had a Vitesse T/C in both my 2013 C6 and 2017 C7 Grand Sports. Never an issue in either over a cumulative 5 1/2 years. If I were in the market today, Soler would be my choice based on feedback here and price.

 

I TOTALLY agree, and easily removed if you think it will hurt your warranty.. most won't even know it's there + the new Soler DLX bluetooth controller you don't even have to have controller box visible..Night and Day difference for my Z