I've read some articles from searching to see what everyone recommends for improving the low end torque on the 5AT Sedan. It seems like everyone is pretty mixed on how to improve so I'm confused. Some disagree on a few mods that may or may not improve or reduce the performance at the low end.

So far, I've installed the Z-Tube, K&N drop in and done the airbox mod. Over 3000 RPM is awesome, I'd like to target my next mod at the lower end.

Does anyone have any recommendations? Coupe mid-pipe? ECU change? Plenum? Grounding? CAI? Pulley?

 

I have the spw greddy exhaust and injen cai try that

www.atozsupplement4u.com

 

Since air flow restrictions increase [only become measurable] at high rpms, aftermarket mods only work at high rpms.

Low rpm under 3500 rpm is pretty much a function of displacement, compression ratio, and cam timing.
When you open up the diameter of things [like plenum runners, valves, TB, hoses,etc] it slows the air flow speed which is detrimental to low speed filling and thus the torque drops.

Short of Nitrous, supercharging, or changing cams not much one can do to improve low rpm torque.........which has already been optimized to allow smooth cruising at low rpms [2000-2500] with AC on up mild hills. Factory creates maximum efficiency to maximize fuel mileage at highway test speeds.

Some times extremely loud exhaust wil gain a percent or two at 2500 rpms.

The 3.5 is a torque monster compared to almost every other streetable engine of its same size. However the 4 valves per cylinder that enable the high torque significantly reduce low rpm torque compared to an old style 2 valve per cylinder engine.....think seesaw.

 

You could always put the G on a diet. Lightweight battery, remove spare, lightweight rims/tires, lighter exhaust. Doing all of those shouldn't affect the balance of the car too much.

And then you can always take out the seats/dash/interior, but I have no idea why anyone would want to do that to this type of car.

As for some of the mods you listed:

CAI - I'd definitely stay away from that, you will likely lose low end and gain slightly (questionable) at the high end. You may also notice slower throttle response depending on how long the intake tube is.

Coupe mid pipe - Cheap and saves some weight. Should be done as a "sound" mod only.

Pulleys - you will probably see quicker revs and slight gains throughout the rpms. Of the ones you listed, I might try that first.

But those are just my opinions, others may disagree. And you have to remember that mods work differently in different combinations and result in different gains/losses in hp/torque.

 

Yo graphitemoxie listen, for exactly what you want get the unorthodox racing either crank pulley or pulley set. This will give you that low end boost off the line all the way throughout the rev band and every gear, believe me!!!! I was looking for that also and didnt even think this would affect it, and now without powerbreaking stompin the gas chirps your tires from a stop a lil and give you that low end torque believe me!! I have a sedan also, Martin


Martin
2003.5 BS G35
Nismo Aero/Sport Package
Injen CAI
B+G Springs
ADR M-Classic 19's..

 

You guys forgot to mention a torque converter.....Pulleys would help out low end torque a lot because the faster reving would allow you to get to the higher rpm's, where the engine's torque is, faster.

Heeeeellllllloooooooooo people.......

2003.5 Black/Black 5AT Fully Loaded w/ Navi
Clear Corners / Injen CAI

 

Crawford Plenum install will net some torque.
Check This Thread for details.

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