Does your G "Kick" at 4k RPMS?

[Sentientbydesign]

I've been babying the new engine and just finished the break in period (now at around 1600 miles).

I had the REV light set to 4500 to keep me from pushing the engine too hard during break-in, so I thought the flashing red light was what was making me anxious, but changed the rev light to come on at 6k and I'm still getting a noticeable kick at 4k.

Is VTEC kicking in?

[Jacko3]

If your engine is the revised engine, which I definitely think it is, you should get the kick even earlier at either 3K RPM or 3.5K RPM. The torque in revised engine is marvellous. I have never had to push a gas pedal so hard before in my life to get to 5K RPM---thats how much torque there is in the revised engine. Till date, I have been unable to floor the whole pedal to the metal even at 1** miles per hour. That's how I know, there is still some left over power in that VQ engine. Really fantastic engine! I love it!

[Sentientbydesign]

The "kick" I'm talking about is a sudden increase in engine speed and power. It comes on just after 4k rpms (maybe 4100). I don't have to change my throttle input or anything, just a surge of power. It's kind of weird.

[C-Kwik]

I have never had to push a gas pedal so hard before in my life to get to 5K RPM---thats how much torque there is in the revised engine. Till date, I have been unable to floor the whole pedal to the metal even at 1** miles per hour. That's how I know, there is still some left over power in that VQ engine. Really fantastic engine! I love it!

You do realize that the G35s use throttle by wire right? The only resistance to pedal movement you will feel is the spring that the pedal is attached to. And its a fairly light spring at that. Unless you're trying to push the gas pedal through the floor...

That said, power output is not defined in anyway, shape or form by how hard it is to push a pedal. And this is also true at any speed...

[Jacko3]

C-Kwik:

So, what do you think would account for this? Since after installing the mods, its gotten a lot better and freer to press that pedal.

You said, "Unless you're trying to push the gas pedal through the floor...". C-Kwik, as you well know, I haven't yet learnt how to drive like a normal person. I always try so hard to press the pedal to the floor and probabaly through it, in any car I get into. Maybe this is a serious problem I have and I don't realize it. I was warned by the sales consultant not to flog the FX 50 I went to test drive---he actually threatened to drive the car back to the dealership if I flogged it one more time.

[Jacko3]

Does it feel like you are riding a Mustang (horse) on a rodeo, when that sudden surge of power comes on?

[Sentientbydesign]

Guys,

NO THREAD JACKING ON THIS ONE!!!

It feels similar to when I drove a WRX and the turbo started to spool.

[Jacko3]

I have no idea about how it feels to drive an WRX feels like. Totally clueless about that.

[RED_DET]

CVVTC... Continuously Variable Valve Timing Control.

[Sentientbydesign]

CVVTC... Continuously Variable Valve Timing Control.

You think it modifies the intake/exhaust valve "height" around that RPM range and I'm feeling it?

[C-Kwik]

C-Kwik:

So, what do you think would account for this? Since after installing the mods, its gotten a lot better and freer to press that pedal.

You said, "Unless you're trying to push the gas pedal through the floor...". C-Kwik, as you well know, I haven't yet learnt how to drive like a normal person. I always try so hard to press the pedal to the floor and probabaly through it, in any car I get into. Maybe this is a serious problem I have and I don't realize it. I was warned by the sales consultant not to flog the FX 50 I went to test drive---he actually threatened to drive the car back to the dealership if I flogged it one more time.

It sounds like you might have an issue like some people who play video games do. They end up pressing the buttons or thumbsticks harder to try and do whatever it is they are tying to do faster than the game controller will allow. It is pointless. I don't have any hard suggestions to fix this. Just try and relax a bit.

Guys,

NO THREAD JACKING ON THIS ONE!!!

It feels similar to when I drove a WRX and the turbo started to spool.

Hard to say what it is. I mean, if the torque curve prior to this surge is in line with other G's then you might have gotten lucky and have some set of conditions that is providing you with a bit of extra power. Or if the torque curve after the surge is in line with other G's, then you might have a problem.

You could claim its your grounding wires.

CVVTC... Continuously Variable Valve Timing Control.

That generally provides a broader torque curve, but generally wou;dn't account for big surge. Of course its hard to quantify how big this surge is...

[Sentientbydesign]

I know you miss your G, come drive mine!!!

[TeflonG35]

You have a car that has a nice amount of torque. It happens.

[Jacko3]

It sounds like you might have an issue like some people who play video games do. They end up pressing the buttons or thumbsticks harder to try and do whatever it is they are tying to do faster than the game controller will allow. It is pointless. I don't have any hard suggestions to fix this. Just try and relax a bit.

C-Kwik, I am working on it. I know I will get there someday. The G is a beast that possesses every fibre of my person.

[kdfja1]

Becuase your engine is a Rev-up engine i'm assuming, along with your spacer you will feel a "kick" wen you hit high rpms. What the mechanics behind it is, the new plenum for the Rev-up model has more capacity for air so when you hit higher than 4k rpm it will suck in alot of air to keep up with the excessive combustion of your engine. This is only enhanced by your Plenum spacer which also creates a higher chamber for more air in your plenum.

Btw, you are not feeling "torque" when you feel the kick it is actually an increased HP that you are feeling. Notice in the 03-04 models the g35C has more torque but less HP, the Rev-up models have LESS torque but MORE HP, and the name "REV-UP" is quiet self explanatory (REVING higher to get more POWER or horse power). If you want both positive sides of the coin purchase a MREV2 which is basically a 03-04 lower plenum that will make up for the torque lost in the newer "Rev-up" models.

Hope this explanation helps and true

[Sentientbydesign]

Becuase your engine is a Rev-up engine i'm assuming, along with your spacer you will feel a "kick" wen you hit high rpms. What the mechanics behind it is, the new plenum for the Rev-up model has more capacity for air so when you hit higher than 4k rpm it will suck in alot of air to keep up with the excessive combustion of your engine. This is only enhanced by your Plenum spacer which also creates a higher chamber for more air in your plenum.

Btw, you are not feeling "torque" when you feel the kick it is actually an increased HP that you are feeling. Notice in the 03-04 models the g35C has more torque but less HP, the Rev-up models have LESS torque but MORE HP, and the name "REV-UP" is quiet self explanatory (REVING higher to get more POWER or horse power). If you want both positive sides of the coin purchase a MREV2 which is basically a 03-04 lower plenum that will make up for the torque lost in the newer "Rev-up" models.

Hope this explanation helps and true

Thanks for the explanation, but this is all info I know...not to be applicable to this situation.

I've had the car for 8 months. The unrevised engine didn't have the "kick" at 4k. The only difference with the revised engine is the piston rings.

I actually think that my plenum spacer is probably doing more "damage" than good without the Mrev2. The difference between the rev-up and non rev-up plenum was the length of the intake runners. As is typical with long and short ram intakes, the short will give more torque and quicker throttle response, but the long will have more top end HP.

Thanks for trying.

[C-Kwik]

I know you miss your G, come drive mine!!!

LOL. Don't tempt me man! I do miss it though. But more than anything, I just miss getting out on the race track. Been thinking about picking up an old Datsun project to beat up on. Of course, that could end up being a big expense all said and done.

[C-Kwik]

Becuase your engine is a Rev-up engine i'm assuming, along with your spacer you will feel a "kick" wen you hit high rpms. What the mechanics behind it is, the new plenum for the Rev-up model has more capacity for air so when you hit higher than 4k rpm it will suck in alot of air to keep up with the excessive combustion of your engine. This is only enhanced by your Plenum spacer which also creates a higher chamber for more air in your plenum.

The move to a large plenum box likely has a lot more to do with evening out airflow between cylinders. Tha large volume will really provide more potential for higher flow to the cylinders for an very short period when you change throttle position quickly. But once it stabalizes, the airlfow will still be limited to its weakest link.

Btw, you are not feeling "torque" when you feel the kick it is actually an increased HP that you are feeling.

Actually, you don't feel HP. HP is a calculated figure that takes into account torque and RPM. If you had a motor that produced a constant amount of torque, in a given gear, the car would accelerate at the same rate from idle to redline. But if you looked at the dyno chart for that motor, the HP curve would be a straight line that slopes up. The HP curve would not have a direct relationship to acceleration as it would imply that acceleration force would be twice as high at redline than it is at half of redline. But that wouldn't be true. And if you increase torque at any given RPM, the HP at that RPM will also go up.

Notice in the 03-04 models the g35C has more torque but less HP, the Rev-up models have LESS torque but MORE HP, and the name "REV-UP" is quiet self explanatory (REVING higher to get more POWER or horse power). If you want both positive sides of the coin purchase a MREV2 which is basically a 03-04 lower plenum that will make up for the torque lost in the newer "Rev-up" models.

The peak torque on the rev-up model is lower, but what you aren't considering is that peak torque does not necessarily dictate that there is a loss of torque at all other RPMs. In fact, if you calculate the torque at the peak HP RPMs then you'll realize that at these RPM's the rev-up has more torque. Further, if you were to plot the torque peaks and the torque values at the HP peaks, you'ld find the rev-up motor has a flatter curve between the torque peak and HP peak. It's also likely the trail-off beyond the peak HP RPM would have similar traits as well and may have even more torque at redline than the non-rev-up does at its redline.

[kdfja1]

hmm that makes sense

[joe603]

For the record, my G does seem to wake up at 4k and keeps building till 7k. The effect was magnified after the MREV2 and 5/16's spacer mod.

[Jacko3]

I would agree!

[Tampa G35 Sedan 6MT]

I think that would be a good mod for me to do next when i get some more money lol...

Does that help with MPG???

DJ

[Jacko3]

All the mods helped with MPG until they decided to blend ethanol with the gasoline.

[Sentientbydesign]

All the mods helped with MPG until they decided to blend ethanol with the gasoline.

Just think...your MPG could have been even worse without the mods and WITH the Ethanol

[joe603]

Yes, it will help with MPG...but you have to not "flog" the car to realize the savings in gas

Jacko3

[Jacko3]

Very true! I actually thought about that a few days ago, and I was so glad that I had the mods.

[Jacko3]

That's right! Drive it normally, and you will be amazed at how good the G35 is with gas, when moded out. But because Jacko needs help in controlling his urge to flog the G , don't drive like Jacko.