G35: VQ35 - Pump Gas Dyno

[Spent]

Mods:Plenum SpacerTest PipesHaltech Platinum ProEverything else is stock

This setup belongs to Robbie who brought us his G35 for custom Haltech tuning.

The majority of the gains were from fuel, some from ignition and some from adjusting the cam angles. Blue is the stock ECU and it was running lean (flirting near the 15:1 a/f ratio) down low and some in the mid range. A highly likely possibility for the stock ECU running lean, especially down low is the plenum spacer. There is more air coming in but the stock ECU doesn't add more fuel to compensate. Basically, even though his motor could flow more air than before, he was loosing power because he was not tuned for the additional mods. There was also knock registering in the midrange on the stock map from the overly lean condition. It was not enough to be felt on the street but enough to be picked up in a controlled environment like on a dyno.

In this particular tune, we not only tweaked the cam angles for WOT conditions but also for partial throttle conditions for better overall response. In case you are wondering, the other two runs are basically the final numbers. Usually I post a before and after but for whatever reason, I left an extra run in there.

I mentioned to the customer that a nice set of long tube headers and a full exhaust will really wake this motor up. Also, being that Haltech can control cam angles, this setup stands to benefit from more aggressive cams. Usually on a VQ35, you don't stand to gain much if anything from more aggressive cams on a stock ECU. You would need a program such as Haltech that can control cam angles to take advantage of it.

[audtatious]

Looks good.

Long tube headers are probably a dream on the G (at least I don't know of anyone offering any). Cats are restrictive and the factory exhaust is a tad restrictive.