ldepalma

Mine is not the hill assist. The throttle lag is on flat ground in 1st gear or reverse. When the car gets moving the lag disappears and does not happen from 2nd thru 7th gears. Maybe the correct word should be hesitation. My C6 never had this issue and it was a '13 of course and not DI. Some people might not notice it unless you know what the symptoms are. For those that say they have a manual and don't see a problem, try this test. Find yourself a flat surface, put the car into 1st gear but do not let the car roll out of gear. Put your foot on the gas pedal and gently let the clutch out, now give your car the gas - the hesitation comes from the point you put your foot on the gas until the car reacts - that's the lag. Not only can you feel the lag response you can hear it in the engine sound. It's very similar to driving a turbo. Once you notice it, it's very annoying....

1986C4Z51

Sounds like rotational inertia to me. The Chevy V8 has always seemed to have had slow low speed acceleration, and you add the variable cam, cylinder deactivation, a heavy flywheel and clutch and or torque converter, it can't help any.

ChucksZ06

You cannot be serious. If you are serious you know very little about small block chev engines.

Halltech

Yep, I agree. 70% throttle position before tripping into PE mode is part of the issue. The C6Z06 was 48%.

There are several areas that attenuate full power.

VNAMVET

So the 70% should be 100% to cure the "lag" and if so, can any "tuner" re-program it?

Thanks.
Craig
2014 A6

Magister Ludi

I have been waiting for someone knowledgable to comment on this.

I love my C7, but this is a source of constant irritation. I get better throttle response in my BMW 740, which is a boat.

The rest of the C7 is so precise and responsive, the low RPM throttle respose is really out of character. Is this some kind of safety measure to keep rookies from getting sideways. Is there a fix without affecting the warranty?

Edit: I typed this after reading only the original post. What follows seems to answer my questions. Thank you.

TTRotary

The throttle curve in that mode is likely programmed this way primarily for fuel economy considerations, IMO. If the throttle was opened as fast as the foot wanted, the car would not remain in stoich, so it gradually opens the plate and does the same for the injectors. We had the same issue on our E90 335i and it drove me nuts. BMW later fixed this, but could not fix ours. Our (well, my wife's) new MB E350 (DI) has razor-sharp throttle response and I love it.

I actually think a lazy throttle is a safety hazard rather than a benefit, because the juice is not there when you need to get out of a tough spot. I can also see the benefit of not having a noob spin it, but that's what AH/TC is there for. That said, the electronic nanny in my C6 is absent at very low speeds.

Anyway, sounds like a tune will solve the issue.

Dan12

Grammer guys should have there own forums.

Delta88

Does the cold air make a big difference
In the C7?
I had the Halteck on my C6 ZO6 I had to take it out and put back the stock intake. It was making the check light go on

Halltech

PE mode is open loop. An example of the throttle position we use on our Z06 is 25%. Touch the throttle and the tires light up any time we are over 25% TP.

Some tuners turn off CL when tuning for e85, I do not. I like having the 9.85:1 ratio in closed loop normal driving, but go to PE enable at slightly heavier foot.

I know this can be tuned out, but I mentioned the issue only as a minor annoyance. Going from 3.89lbs/hp with 629lb-ft torque and 2777 lbs, to an auto C7 is just a big change.

The C7 auto is still an amazing car. Lauching the car from a dead stop would simply blow away the tires if all TM nannies were shut off.

Halltech

Bet you had a hole under the filter too. Any time you open the radiator shroud with our MAF forward design, you will have issues. It was designed to work only with the NACA duct.

Bill Dearborn

That throttle response issue happens in plenty of NA engines. Seems to go with the eco territory. My 08 Bu has plenty of throttle lag when the automatic is in Drive mode. I have to anticipate when I need the throttle to compensate for the lag. However, when I shift it into manual mode the lag is gone. I have driven plenty of other 4 and 6 cylinder cars with the same kind of lag. It is like the car is trying to decide what it wants to do. Open the throttle, downshift, or open the throttle and downshift depending on how much you press the pedal. I get the worst response if I try to go wide open with it.

Bill

1stTimeforEverything

It's "grammar".

Dan12

Thanks Einstein, however you missed “There” should be “Their”

You also missed the point!

1stTimeforEverything

Were's that forum at??

gbgary

gbgary

Thunder22

Or "non-grammar" guys could be ostracized to the "dunce forum". Either or

2K3Z06

That's kinda funny, I test drove a 2014 GMC pick up, this weekend. It did the same thing, it seemed like it was "turbo lag" in 1st gear from a dead stop. It just drove weird.

I thought it was in 4 cyl. mode and was having trouble getting going. Hope that's not the "new" way of doing things around GM.

Heber Guy

My new Chev Van is doing the same thing and driving me nuts. A constant irritation.