Customer bought a K&N Air Filter for his car, asked us to install it, and dyno his car before and after. Before the air filter was a stock piece.

The car is a 2005 Infiniti G35 with an automatic transmission.

We strap the car down.



We baseline the car. Note, there is no tuning done. The car is dyno'd as it came off the street.



With the stock air filter, the car dyno'd 226.80rwhp and 212.56 ft/lb of torque.

Next, we installed he K&N 33-2031 air filter into the G35. Install took 2 minutes.





With the K&N Filter Installed, the G35 put down 228.65rwhp and 209.84 ft/lb of torque.



The car has about 42,000 miles on it.

 

Less than 1% difference, but at least it doesn't HURT performance.

thanks for the pics and dynos, which I'm sure everyone appreciates

 

Good info. Thanks. I don't feel bad about having one now.

 

maybe 30% more (max) but not 30% more (actual)

 

nice, u wasted ur money on that and lost tq.
and had no gain. veddy nize...

 

now at least he can clean his filter I do not see that as a waste

 

I wonder if a manual Z looses that much torque. This post kinda makes me want to replace my K&N back with my stock filter. I'd rather loose th one HP i gain with the K&N, instead of loosing torque.

 

+1

 

Hmmm, this is actually pretty disappointing for me. I was hoping my drop-in K&N would give a little bit more than that.

side note: I'm thinking the change could also be due variations in conditions.

 

Once again i will revert back to stock, where i should of stayed and saved my money to begin with.

 

Anyone notice that the second dyno has smoothing factor of 0 and the first is 5. It does make a difference.

 

Can someone make sense of this please? I don't understand why a filter that flows better would cause a drop in torque.

 

Do you have the runfiles?