Haven't noticed any hesitation with my 2017 GS in Tour Mode, where I keep it 99% of the time.

 

 

Some notice it more than others. I have a 2016 with the 7-speed, and it was very noticeable and annoying. I've used the Vitesse, which tended to cause my car to go into limp mode after full-throttle blasts up to the redline. After a few too many of those events, I installed a ported throttle body from Tony Mamo. The throttle response has been significantly improved, and I haven't needed to use the Vitesse any more.

I suspect it's less an issue with the automatics, since the torque converter helps mask it.

 

I would say there is a difference in throttle response between the 3 modes - Tour, Sport and Track. At least I can tell the difference with my 2019 M7 Grand Sport. I drive mostly in Sport mode and can say for sure, my previous 2008 Z06 was definitely more responsive.

 

ZERO difference in throttle response between drive modes on my base stingray. I did recently drove a new GS 7mt and dint notice and difference either.

 

Have a 2019 Grand Sport (A) and can't say I've noticed a difference between the different modes, but IMO there is a lag between hard pedal push and vehicle acceleration. That being said, I've read a lot of the discussions about A8 issues and decided to buy a Range AFM. Now that I've bought it, I'm not sure I'll drive the car without it. Acceleration is much smoother, transmission shifts are barely noticeable and throttle response is better. My estimation is that the by eliminating the the movement from V4 to V8 and back, it reduces various mechanical fluctuations in the engine and driveline. Again, just my opinion.

 

Guys,

Those who have noticed the off idle lag (for lack of a better description) of these LT1 and LT4 engines will absolutely love my ported TB.

The abridged version of why is the OEM TB is a horrible design in it's stock configuration and the airflow the blade allows to pass through it is anything but linear in regards to pedal travel versus airflow being allowed to flow through it. You can apply from 10% throttle to 20% throttle and see very little difference in airflow from the fact the design is so poor.....that's the disconnect or the lag your feeling.....your pushing the pedal and your brain is expecting more acceleration but nothing happens as the TB opened a bit more but didn't actually flow much more air.....so you push the pedal a bit deeper and you finally get a little response....than a little more on the pedal and the car finally responds as the blade has finally uncovered some air for the engine to breath and convert into energy.

There are literally hundred of positive independent testimonials of my ported 7th hen Vette TB's on this forum if your inclined to spend some time looking

I offer a 30 day performance guarantee....if you don't absolutely love it I will refund you the full cost of the part.....you have a month to drive your car to decide but you will know on your first drive down the block that you will want to keep it I assure you

Its the best low buck mod on the planet for a 7th Gen Vette hands down and the reason that's true is because it fixes a problem inherent in the OEM design. This TB was an inexpensive stocking GM item that was initially installed on light trucks etc. that GM gave the nod to install on your high performance ride. This move is a great example of GM bean counters at their finest as there is nothing performance related about this TB in any respect. I design heads, intake manifold and TB's for a living and when I tell you that the LT1 is the worst OEM design of any throttle body that I port I give you my word that is my honest assessment of it. Its scary bad out of the box with a huge sharp edge small wall around the entire perimeter disrupting and reducing airflow a great deal. I am not kidding.

Ask some of your fellow forum members who have seen my ported unit compared to OEM....its a night and day improvement in shape and function

$390 shipped.....lead times are usually a week or two....every so often you might catch me with a little inventory and I ship right away if your timing is good.

Want to see a little more in the way of science and flow data compared to stock this is an excellent thread for those who crave the data as well

https://www.corvetteforum.com/forums...ts-inside.html

PM or email me if you would like to order one....guys that have purchased take the time to email and PM me back thanking me for this product and that really says alot

Cheers,
Tony

 

I have ported TB and intake and tune among other mods but still run a Viteese throttle controller. I love having the ability to change throttle response to suit my mood on the fly with just a twist of a ****. It's like turning the volume up on your stereo, but more fun. To each his own. Many posts about this mod. Tony is right, much can be improved by some simple mods. Its gets down to how much control you want. Chuck Cow also does some throttle position map changes as well (describing that I'm sure wrong) that permanently recals the throttle pedal to TB plate angle curves to tune out the factory delay. These cars are not tuned with linear response maps from the factory.

 

If anyone is curious what the porting I mentioned above looks like vs stock, here's a photo. Stock is on the right.

 

 

 

No tune for just TB and no warranty impact. It's the GM TB that Tony or many other will port. They will even port your throttle body if you send it in. Otherwise...you're probably getting another forum member reworked core exchange.

 

I bought my ported TB and actually recieved a newer (replaced by) part number that GM released on newer than 2017 model yr cars. Couldn't find out why PN changed but assumed some vendor change or slight internal tweak. The old TB P/N has a newer released replacement number.

 

I sell them brand new.....an outright purchase of a stock ported GM TB

You keep your OEM unit in the event you have any issues with the ported TB (unlikely) and or if your having a bunch of engine related warranty work and feel better taking the 10 mins it takes to swap in the unported OEM unit before you bring the car in.

These TB's are cheap enough that mailing your used ones in to port and not having the flexibility I just mentioned seems silly. If the TB was alot more money I would offer them on an exchange basis but the bang for the buck you get for under $400 and ten minutes of your time installing it is insanely good with this mod. It transforms how the car drives and reacts on the road and it makes more power which doesn't suck either but the power IMO is more of the perk than the other way around. The OEM TB is so badly designed on these cars they just never drive right till you get that handled.

I have had customers that didn't even know or think they had a problem swap over to my ported TB because its affordable and so highly recommended and they were glad and surprised when they did. Pretty funny getting that call or email but naturally very welcomed

Regards,
Tony

 

 

 

Thank you very much! Probably the best solution is the "as programmed software solution" we call CoW BOOSTER! to keep it simple. Beware of the shortcut

products that plug into the gas pedal and harness with wires and a button or box.... EXTREMELY BAD idea. While some do offer a simplified solution, its also

those same products that have more than their share of potentially VERY dangerous reduced engine power or unintended engine shutdown problems. Any thread

that discusses those products will also have plenty of accounts of unacceptable problems where the product needed to be removed to resolve the issues.

Our solution still maintains a 1,000% NO FAILURE / NO PROBLEMS status. The other products can't claim that.

Since the early C5 days, we have been the clear leader in "Corvette (and other GM platforms) THROTTLE RESPONSE IMPROVEMENT department.

Please call any time if anyone has questions.

Thank you.
Chuck CoW

 

Another vote for Tony's TB. Porting work is great and you will appreciate it more when you compare his unit and a stock unit side by side - pictures don't really capture the difference. Also as he stated, the throttle response is much better. First upgrade I did and very happy with it.