2007 g35 throttle issue?

[jaykeck]

I have a 4 month old 2007 g35x. Overall I really like the car but I have a question/thought about the throttle//acceleration. I find the gas pedal to be very, very sensitive. I have to make a concerted effort to start from a stop with jerking everybody in the car back. If I am not careful, I can get myself carsick. I recently received a Infiniti newsletter. In it, they explained what SWELL is supposed to be. The newsletter said, "While ramping up to speed, Infiniti’s Acceleration SWELL provides drivers with a smooth flow and minimizes quick bursts of speeds. Instead of distributing explosive speed that jerks passengers, the Infiniti G35 Sport dispenses effortless acceleration and infinite power." In my car (and it seems like many others from the posts I have seen) they missed this mark totally. Any thoughts on this? Could they re-flash the computer? Will there be a TSB? Thanks.

[AZhitman]

Common, typical - The G35 automatic has alwys had a "non-linear" throttle application.

In my estimation, half-pedal = 3/4 throttle, and the last half of pedal travel is fairly useless.

There MAY be some "sticking" in the throttle-by-wire system. Complain to the dealer, and keep us posted.

[Q45tech]

When you have overly large throttle plates [to run high rpms efficiently] you always get these weird effects.

[elwesso]

Shoudl be easy to control with throttle by wire.

I noticed the same thing on the G and it drove me CRAZY... I found that manually shifting into 2nd gear makes it much easier to start smoothly. I know you shouldnt have to do that, but its an easy fix.

[StarPD]

When you have overly large throttle plates [to run high rpms efficiently] you always get these weird effects.

Q45tech is correct, as usual. The issue is commonly known as "throttle tip-in", and is frequently more abrupt on cars with high horsepower and the large throttle bodies required to flow enough air at high rpm. I've noticed it too on the G35 loaners from the dealer. It does take some getting used to, but I suspect that if you learn to modulate pedal application, after a while you won't notice it. You have an exceptionally fast car for it's displacement, and abrupt throttle tip-in is one of the prices you pay for the great performance. Enjoy it.

[Q45tech]

Does anyone remember 3x 2barrel carbs vs 2x 4barrels with vacuum vs mechanical secondaries?

Maybe they [aftermarket] will make a AFC* for the throttle pedal dual sensors so owners can trim the pedals response vs leg motion.

The ecu actually measures demand open degrees gain = how fast you push/let off accelerator potentiometer ................[we should drop the term accelerator pedal].

* Grandma, Grandpa, Normal, Hyper, and hyper on power drinks positions...............infinite variety.

[StarPD]

Does anyone remember 3x 2barrel carbs vs 2x 4barrels with vacuum vs mechanical secondaries?

Maybe they [aftermarket] will make a AFC* for the throttle pedal dual sensors so owners can trim the pedals response vs leg motion.

The ecu actually measures demand open degrees gain = how fast you push/let off accelerator potentiometer ................[we should drop the term accelerator pedal].

* Grandma, Grandpa, Normal, Hyper, and hyper on power drinks positions...............infinite variety.

Indeed. I had a 425 HP 409 Impala SS in '63 with dual quads. It came with progressive linkage that I modified to parallel, and mechanical secondaries.Carbs were Carter AFBs. I also had a 425 HP 396 '65 Impala SS with a single large Holley that had vacum secondaries, converted to mechanical. I even had a 435 HP 427 '68 Corvette with triple two barrelsl also converted from vacuum end carbs to mechanical, parallel operation. Throttle settings were done with main barrels on all setups as primary, and all secondary operation slightly after throttle tip-in to eliminate bogging and jumpy starts. I liked the dual quad AFBs the best. They sang to me at WOT and high revs like nothing else. I miss them.

I like the idea of AFV. With moderen throttle by wire, that shouldn't be too difficult to do. I'd also like to see the speed-sensitive steering adjustable the same way. Too bad Infiniti uses adjustable effort on their setup instead of the adjustable ratio that BMW has. They use a planetary gearset in the steering gearbox that adjusts ratio according to speed, and their adjustment curve is superb. Not sure if it's capable of being owner modified, but that would be even better.

Hmm, I wonder what it would take to be able to change throttle settings and tip-in on current throttle-by-wire operation. Seems being able to change the values in the ECU would do that, but so far, no one makes a tunable ECU for late model Infiniti V-8s or V-6s. Probably a pipe dream, but I'm imagining being able to change settings for power, throttle, steering, and suspension with an ECU that accepts re-programming. Would that be too cool or what?

How about it computer/electronics geniuses? What would it take to modify the ECU to be flash-reprogrammable? Someone must surely have the skills to come up with something like that. The market for such may not be huge, but I suspect that there is one. I know I'd be a prospect.

[g35x2007]

I have the same issue, I have a 2007 g35x that jerks ahead when i press the gas. Drive me nut when I just need a little extra power to change lanes or keep someone from cutting me off in traffic.

Have you dicovered any solutions or work arounds?