Every time I get into my C7 Z its hard to believe the difference in torque from my C6 Z06 night and day. I actually have to push on the gas pedal on the C7 to get it to move where as the C6 Z you could take off in fourth gear if you wanted. I still say if the C6 Z had updated interior and suspension I would buy one again to me that body style is beautiful but the C7 is superior in every way but torque...

 

I would suggest the soler throttle controller because it improves the throttle response to a great degree in all C7s. The C7Z has much better throttle response (stock) than a Stingray or GS but the controller makes a world of difference. Most pair it with the throttle body as well.

 

I guess you mean idle torque, I found the C7Z a bit hard to launch smooth and still need to be careful as it's easy to stall. I think it has to do with driving the supercharger. But once you crack that throttle there is no shortage of low end torque.

 

I've owned C6 Zs, and an auto and 7 speed C7 Zs. No question the C7 Z 7-speed is tougher to get rolling. I believe 1st gear is 2.29 and a TB that is low on response off idle. The C6 Z had a 2.66 first gear and a seeming more responsive TB. The C6 Z was a pleasure to drive from a start.

Try a Solar TB. You will see a marked improvement on throttle response or have a tuner/friend clean up driver demand tables..

 

Thanks yes I'm going to be buying one...

 

Just an FYI, but depending on where you live in S. Fl, you have some good tuners in your area. One does remote tuning as well as in car tuning. He goes by Internets_Ninja on this forum. I think he is up around PB area..HTH!!

 

Since the C7Z offers more torque throughout the power curve, including low end, the issue described sounds more like accelerator response and/or gearing.

@Shirl's suggestion to consider a Soler Throttle Controller and/or @Chalky's suggestion of a Soler Throttle Body are probably your easiest and cheapest potential "fixes."

 

No way I'd go back to a c6z after dropping a valve like they seem to all do. A ls7 is not a cheap motor

 

The C7s have an electronic accelerator pedal that has a built in delay. I went with the Vitesse Throttle Controller. You can dial in the amount of response you want. I have immediate torque when I release the clutch and push down on the pedal.

 

I lived with twitchy throttle my whole life, switching to the drive by wire in corvettes was surprising. I'm used to it now after having 4 vettes. I don't think of it as a bad thing. On launch, I find my launches to be smoother than my significantly lower torque built LS3. I could drop the clutch in that car with 0 gas input and it'd still launch from a dead stop. It doesn't mean it had more torque or is better. For part throttle response, the soler throttle body fixed the response to be more faster. It's subtle, but you do feel a difference.

 

I haven't really noticed a throttle lag in my 19Z, does it matter the year? I do want to get a polished TB... I see a lot of people talking about soler, are they better than the momo motorsports one or about the same?

 

I have read somewhere (probably on this forum) that the 19 has a different controller sensor from the factory. My 17 GS had much more delay than the 19. Can't say this is all of it as 17 was M7 and 19 is A8.

 

That LS 7 427 was pretty stout. I can see your point.

 

Are you comparing while the C7Z is in "Tour Mode"? Switch it to Track Mode 1 or 2 and turn off traction control and then run it. Tour Mode is meant to keep you on the street. You'll find out what 650 HP feels like when you put it in big boy mode. I've had both a C6Z and a C7Z and the C7 is WAAAY more powerful.

 

I think the thread title is misleading a bit. He's comparing throttle responses of the 2 cars which are mapped very differently. This is why the throttle body swap to a ported one or the throttle controller makes a huge difference to the C7.

If you want to really compare "low end torque" put both manual cars in 4th and do a pull from idle to 2500 rpm. The C7Z will out accelerate the C6Z despite the 400lb weight difference. The low end torque number of the C7Z at idle is close to the peak torque the C6Z has available.

My 98 camaro which was built up to be naturally aspirated 465ftlb/515hp had around 340ft/lb around 1500rpm all rear wheel readings. It's throttle was cable driven with a 3.91 final drive along with a shorter first gear which made for crazy rabbit starts. Cable driven feels even more responsive than the drive by wire the C6Z uses. Sure the throttle response was near instant and could be mistaken for having way better low end torque. On back to back drives though, after that initial throttle response, could tell you though that from idle to 2500, the camaro just felt like a DOG compared to my C7Z.

https://www.solerengineering.com/technical

You'll probably get similar throttle improvement results from other ported throttle body makers, soler is just an example. Their tech paper shows their throttle body response versus degree opening which explains the whole mapping problem of the C7Z. From an engineering standpoint, having so much torque on hand at low rpm makes a pretty dangerous car for the inexperienced and could get how GM wanted to play it safe that you would have leeway to make easing into the throttle better for the average/new driver. To be honest, the C7Z mapping makes track driving easier too. This is because the smoother you can change gears, the faster and safer you will be. Having too responsive a throttle can make for gear changes that can upset the suspension with hits of too much torque leading you to induce a potential spin out with just a small amount of throttle and steering input with suspension upsetting gear change.

 

Yes, having 650 lb-ft @ 3500 makes for an easy off-track excursion.

 

The C7 Z06 is bottled up in stock form in low throttle low speed areas. Partially from the OEM throttle progression and another part is the variable cam movement that actually bleeds off cylinder pressures at lower RPM's for fuel efficiency. Both of these can be addressed with tuning. If you are weary of tuning, you can help eliminate of of that feel with a ported TB, but it will not compare to what tuning can accomplish.

 

Never thought I'd hear someone talk about low end torque and then go on about how an NA motor has the superior low end torque compared to a positive dispacement supercharger engine.

 

same lol

But it's all in the feel I suppose. I actually put on my ported 95mm LT5 TB a few days ago. It makes the throttle response MUCH snappier and responsive. The oem makes the car feel heavy and dull down low like we said earlier. Cost effective fix with a lot of upside

Also I'd recommend (although very annoying) only drive in track mode. It makes a world of difference. I find touring / sport mode throttle mapping to be horrible and almost unenjoyable. Same with my 16 & 18 LT1 camaros. Give it a try for a week

 

I'm actually talking about when you take off normally from a stopped position in a C6Z without giving it any gas my car would start to roll and quite quickly then after I got going normally I could shift to 4 than 6 without having to give too much throttle, on the C7 I actually have to give it significant pedal to get it to move I know that if i step on the gas on the C7 I'll go side ways (ask me how I know) lol. but the ls7 seemed to have more lower torque at take off. I could take off from a stop in 4th gear in the C6 and not have to put too much pedal in it but on the C7 it needs plenty of gas pedal to move it. This is just my observation after owning several of both model years.