Big gains from K&N intake today

[eatthis]

was it corrected flywheel power or wheel power (its easy to fidle the numbers when using corrected figures)

[Olly_K]

just wanted to add my personal experience. As you know cone filters for the S4 are rare in the UK, i've ordered mine from evolution motorsports in the states, complete with heat shield, etc.
You could hear the turbo's sucking in air, and also the DV's, but performance wasn't noticable. (recorded 315bhp at AmD). The problem with cone filters is they kill the MAF, I had 3 replaced with my cone filter. Put my standard airbox back on and recorded 320bhp at AmD. And the 3rd Maf still going strong.
My advice, dont get one.

[Bisonone]

I have a K&N induction kit fitted to my S4 also. I fitted mine a few weeks ago and yes you can definately feel the difference. I dont know how much extra bhp it has given me but it has definately given me some!!! Other modifications i've done are: Miltek cat back, AMD re-map, bailey dv's, and 18" RS6 reps. Before the induction kit was fitted i was running at 331bhp tried and tested by AMD themselves with printout to prove, so with the the induction kit fitted and the difference i can feel i must be nearer the 340bhp mark now??!!

[Nige_RS4]

Miltek cat back, AMD re-map, bailey dv's, and 18" RS6 reps. Before the induction kit was fitted i was running at 331bhp tried and tested by AMD themselves with printout to prove

I personally am very suspicious of some of the power claims by most tuners - unless you are running a map specifically for Optimax (and use it religiously), I can't see an S4 developing more than 320bhp. As for the K&N, I would think long and hard about what has previously been posted, especially with regards to under-bonnet temperatures and heat soak! Use the money to buy a short-shifter instead - if you've got one of these, put it towards the H&R ARB kit.

[kies4]

AMD told me not to fit the K&N panel I bought, I haven't but still want a nicer sound and to be able to give enough air to enjoy the rechip etc to the full. any ideas on upgrating the air induction ? I'm running 1.2bar I'm sure the stock filter could be bettered ??

[eatthis]

bmc cda??
and afaik they cant fiddle power at the wheels but i heard a certain unnamed tuner DO fiddle corrected by altering under bonnet temps etc

[JonnyX]

They can fiddle everything. It's pretty inexact to be honest and they can obviously change a
few parameters to show you what you want to see. I don't think you can beat in-gear times
really for a true appraisal of a cars performance.

[Nige_RS4]

The AW guys use an 'approved' way called FATS, which measures in-gear times between to MPH increments.

Check it out, we should hold a register here (for everyone, not just the S4 boys). I am happy to pull it together with PhilT's help (with access).

Hare's how FATS works ... http://ctny.audiworld.com/mark/s4/ecux/fats/

Nige.

[Bisonone]

Miltek cat back, AMD re-map, bailey dv's, and 18" RS6 reps. Before the induction kit was fitted i was running at 331bhp tried and tested by AMD themselves with printout to prove

I personally am very suspicious of some of the power claims by most tuners - unless you are running a map specifically for Optimax (and use it religiously), I can't see an S4 developing more than 320bhp. As for the K&N, I would think long and hard about what has previously been posted, especially with regards to under-bonnet temperatures and heat soak! Use the money to buy a short-shifter instead - if you've got one of these, put it towards the H&R ARB kit.

optimax is the only fuel i ever use!!!! Whether you can see it or not, it is 331+bhp! I dont need to look at what has previously been posted about the K&N as i have one tried and tested no problems here just big grins all the way!!! If your car doesn't make it over 320bhp maybe you should try one,so

[Bisonone]

Miltek cat back, AMD re-map, bailey dv's, and 18" RS6 reps. Before the induction kit was fitted i was running at 331bhp tried and tested by AMD themselves with printout to prove

I personally am very suspicious of some of the power claims by most tuners - unless you are running a map specifically for Optimax (and use it religiously), I can't see an S4 developing more than 320bhp. As for the K&N, I would think long and hard about what has previously been posted, especially with regards to under-bonnet temperatures and heat soak! Use the money to buy a short-shifter instead - if you've got one of these, put it towards the H&R ARB kit.

optimax is the only fuel i ever use!!!! Whether you can see it or not, it is 331+bhp! I dont need to look at what has previously been posted about the K&N as i have one tried and tested no problems here just big grins all the way!!! If your car doesn't make it over 320bhp maybe you should try one,so

[KayGee]

Show us what it made at the wheels before and after the K&N. My guess, around 255 BHP before and after. Crank BHP is too easily "adjusted" to be worth anything meaningful, remember any dyno is measuring WHP and then calculating crank HP from that figure.

331+ Bhp from a catback and generic chip is a very, very good result. DV's will not give you any power increase, they are designed to maintain faster turbo spool when changing gears, effectively reducing lag. 18" wheels, generally they are heavier so will only decrease the measured WHP.

Do a FATS run in 3rd gear on flat ground, turn around and repeat again in the opposite direction. Be prepared to show 320 Bhp running that setup.

[eatthis]

Show us what it made at the wheels before and after the K&N. My guess, around 255 BHP before and after. Crank BHP is too easily "adjusted" to be worth anything meaningful, remember any dyno is measuring WHP and then calculating crank HP from that figure

thats the exact point iv been failing to make hehe
as for the wheels increasing the rolling radius ie going from 17" to 18" will decrease the acceleration by lengthening the gear ratio

[Bisonone]

So you are saying that i am only running 255bhp??? AMD who specialise in this field for over 15 years must be wrong then!!! I dont know where your getting 255bhp from when you should know 265bhp is standard before any modifications. I must quote that on the day of the re-map, AMD did say that they were impressed with the result of 331bhp as normally your looking at 310-315bhp!!! Maybe it was becuase i already had my exhaust fitted? That was the result though with graphs and printout to prove. Back to the K&N. All I'm saying is that after i fitted it i felt an improvement, i know my car as you all know your own cars..... Definately more responsive with K&N than the standard restricted airbox!!! I have nothing to prove, i just enjoy driving my car as we all do. I dont know too much about all this whp and crank hp, i've only had my car for a year and it's the first one i've ever modded. All i know is that it is very fast, hopefully will get faster if i take it further........Thankyou!

[KayGee]

Suggest you actually read my post....

Wheel horse power is the amount of power at the wheels. The 331 BHP figure is a calculated crank figure (BHP), the dyno measures the torque (std calculation to BHP) it receives through the rollers via the wheels of the car. Hence the term wheel horse power.

[jeffw]

255 WHP is/would be high for chip and cat-back. More likely to be around 220.