throttle response
SUBVETTE
Joined: Jul 2006
Posts: 3,841
Likes: 93
From: San Diego CA
Ported throttle body will eliminate lag. I bought mine from Vmax Motorsports for $150, best investment I ever made. They have an exchange program so you can simply send them your old one after you receive theirs. 
Le Mans Master
Joined: Aug 2000
Posts: 6,486
Likes: 1,659
From: Las Vegas NV
Hate to burst your bubble, but your still going to have lag even with the controller.
Hence GM programmed in throttle response lag, both pushing the throttle down, and letting off on it as well.
This was done to help gas mileage, as if you where holding the pedal steady instead.
Granted that your going to get into the meat of the power with less pedal push with the Vittesse controller, your still going to have that slight delay on pedal push before engine responce, and the same delay coming off the throttle before the RPM's start to drop.
Note, if you push the clutch in, it will allow the RPMs to drop instantly instead.
In the z06 throttle mapping, GM did not program as much delay into both sides, but its still there to a lesser degree instead (why you can't buck the car with the gas pedal like you could on a carb car).
Bluntly, if you are wanting crisp like a throttled carb car, then it will take a remapping of the throttle response tables in the ECM instead (which HP tuner and EFI live can not get at to do such). Also, you have to think of terms of spinning mass, such as the flywheel and clutch that lighting them would help to allow faster RPM climb and drops as well.
To sum it up, with the C6, you really have to think ahead when driving, to deal with the delays of the two and how you drive the car.
Hence GM programmed in throttle response lag, both pushing the throttle down, and letting off on it as well.
This was done to help gas mileage, as if you where holding the pedal steady instead.
Granted that your going to get into the meat of the power with less pedal push with the Vittesse controller, your still going to have that slight delay on pedal push before engine responce, and the same delay coming off the throttle before the RPM's start to drop.
Note, if you push the clutch in, it will allow the RPMs to drop instantly instead.
In the z06 throttle mapping, GM did not program as much delay into both sides, but its still there to a lesser degree instead (why you can't buck the car with the gas pedal like you could on a carb car).
Bluntly, if you are wanting crisp like a throttled carb car, then it will take a remapping of the throttle response tables in the ECM instead (which HP tuner and EFI live can not get at to do such). Also, you have to think of terms of spinning mass, such as the flywheel and clutch that lighting them would help to allow faster RPM climb and drops as well.
To sum it up, with the C6, you really have to think ahead when driving, to deal with the delays of the two and how you drive the car.
I'm not saying the Vitesse isn't a good thing in its ability to remap the throttle pedal travel curve -- but that is all it does. If you want to feel 75% throttle when you are only pushing the throttle down 25% -- the Vitesse can do that for you, and it will certainly make the car 'feel' very snappy.
But to say it somehow changes any "lag" built into the remainder of the ECM or other systems is demonstrably wrong. Again, read their website.
Team Owner
Joined: Dec 2012
Posts: 30,427
Likes: 1,609
From: Outside the Quick Stop N.J.
I have a VTC (SP6) installed and I completely agree with Bruze on the different "feel" from an older car. There is still a slight delay in response, no ammount of tuning can completely eliminate it, as there is no direct mechanical link between the throttle and accelerator. The VTC is a huge improvement over stock, but electronics can only go so far.
Le Mans Master
Joined: Jan 2008
Posts: 6,457
Likes: 297
From: corpus christi Texas
Thread Starter
Racer
Joined: Nov 2016
Posts: 478
Likes: 18
From: Cape Coral Florida
I appreciate all the input. My last experience with a performance car was a 66 Chevelle, the lag reminded me of the quadrajet when those big secondaries opened up. Switched to Holley, ran Holley on some boats over the years with good luck b4 efi became the norm. They were much easier to jet too. My tuner recommends a TB in his package so I'll try that route for now. Three weeks of ownership and my wallet is bruised up. Hurst shifter DIY this weekend, goin OS, will post some pics.
Le Mans Master
Joined: Oct 2014
Posts: 8,673
Likes: 2,728
From: Atlanta GA
Dave
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Race Director
Joined: Oct 2005
Posts: 14,999
Likes: 200
From: Bay Area Ca.
With only a tune(dyno/street) on a stock motor is a retune required with the addition of the Vmax throttle body upgrade?
Drifting
Joined: Jun 2009
Posts: 1,301
Likes: 231
From: Queen Creek AZ
Drifting
Joined: Aug 2016
Posts: 1,273
Likes: 205
From: Kansas City MO
Thanks!
Former Vendor
Joined: Nov 2005
Posts: 11,792
Likes: 255
From: Ossining New York
St. Jude Donor '07-'08-'09-'10-'12-'13-'14
My CoW BOOSTER! is the only 100% safe and proven product...
My CoW BOOSTER! is the only 100% safe and proven product...
There are no wires to run and it's impossible to mess up.
More flexible to program and when compared back to back with others...
Our CoW BOOSTER! is always the hands down winner.
Call any time!
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Chuck CoW
There are no wires to run and it's impossible to mess up.
More flexible to program and when compared back to back with others...
Our CoW BOOSTER! is always the hands down winner.
Call any time!
914-332-0049
Chuck CoW
Last edited by Vette_DD; Nov 28, 2016 at 11:56 PM. Reason: Mention of rival vendor in quote
Former Vendor
Joined: Nov 2005
Posts: 11,792
Likes: 255
From: Ossining New York
St. Jude Donor '07-'08-'09-'10-'12-'13-'14
That is what tuners like me do.....
Our product (which FWIW is not even a device) is programmed in into the ECM in just the same exact way as if GM engineers
intended to make the cars drive LIKE I MAKE EM DRIVE. WE did it right.
As of today.... ZERO FAILURES.. ZERO COMEBACKS.....ZERO ISSUES.
The other available products can't claim that.
Ours is programmed in the good old USA while the other products are all made in China as cost pennies.
Call any time if you have questions... 914-332-0049
Chuck CoW
intended to make the cars drive LIKE I MAKE EM DRIVE. WE did it right.
As of today.... ZERO FAILURES.. ZERO COMEBACKS.....ZERO ISSUES.
The other available products can't claim that.
Ours is programmed in the good old USA while the other products are all made in China as cost pennies.
Call any time if you have questions... 914-332-0049
Chuck CoW
Last edited by Vette_DD; Nov 29, 2016 at 12:00 AM. Reason: Mention of rival vendor's product
Melting Slicks
Joined: Nov 2013
Posts: 2,587
Likes: 69
From: Memphis Tn
Drifting
Joined: Jun 2009
Posts: 1,301
Likes: 231
From: Queen Creek AZ
Does the ported throttle body affect the ability to get the car "smogged"?
Melting Slicks
Joined: Sep 2002
Posts: 2,787
Likes: 139
From: Las Vegas NV
Our product (which FWIW is not even a device) is programmed in into the ECM in just the same exact way as if GM engineers
intended to make the cars drive LIKE I MAKE EM DRIVE. WE did it right.
As of today.... ZERO FAILURES.. ZERO COMEBACKS.....ZERO ISSUES.
The other available products can't claim that.
Ours is programmed in the good old USA while the other products are all made in China as cost pennies.
Call any time if you have questions... 914-332-0049
Chuck CoW
Chuck
Im interested in you product for my 2013 ZR1 I am also retired Navy. Can you PM me with details on how to install the software in the ECM?
Last edited by Vette_DD; Nov 29, 2016 at 12:01 AM. Reason: Quote on non-allowed vendor vs vendor