ECU Flash Tune...

[JFP in PA]

Originally Posted by 986 Boxster

The only mod that I was considering was the underdrive pulley, it seems to add the most power for the money, but after some research I see some people are against it, including yourself. I do have a K&N free flow filter, I just took it out a few weeks ago to clean it. If it adds a couple of horsepower or not I don't really know, but it sounds nice.

Just to clarify, under drive pulleys do free up a few HP; what I have a problem with is cutting away the boss used to lock the engine at TDC to fit one on, which make some potential future maintenance items, like retrofitting the IMS, more difficult for a shop.

As for any oiled air filter, no. Putting an oiled air filter in the air stream ahead of the MAF is asking from problems down the road. While they may sound cool, any power improvement is at best within the margin of error on a dyno pull, and every GT 2, GT 3, and Cup race car out there runs a dry element air filter.

[986tate]

Originally Posted by JFP in PA

Just to clarify, under drive pulleys do free up a few HP; what I have a problem with is cutting away the boss used to lock the engine at TDC to fit one on

Are all 986 under drive pulleys like that?
Was thinking of getting one, mostly to reduce PS temp at track

[JFP in PA]

Originally Posted by 986tate

Are all 986 under drive pulleys like that?
Was thinking of getting one, mostly to reduce PS temp at track

To my knowledge.

[986 Boxster]

Originally Posted by JFP in PA

Just to clarify, under drive pulleys do free up a few HP; what I have a problem with is cutting away the boss used to lock the engine at TDC to fit one on, which make some potential future maintenance items, like retrofitting the IMS, more difficult for a shop.

As for any oiled air filter, no. Putting an oiled air filter in the air stream ahead of the MAF is asking from problems down the road. While they may sound cool, any power improvement is at best within the margin of error on a dyno pull, and every GT 2, GT 3, and Cup race car out there runs a dry element air filter.

That's why I haven't put the K&N filter back on again, I've been reading a lot of horror stories about oiled filters on these cars. I was looking at the BMC, but it's also an oiled filter.

[blue62]

Originally Posted by 986 Boxster

That's why I haven't put the K&N filter back on again, I've been reading a lot of horror stories about oiled filters on these cars. I was looking at the BMC, but it's also an oiled filter.

Using an oiled air filter on any car using a MAF Sensor and or a MAP Sensor is asking for problems.
So that's pretty much any car manufactured and sold in the USA from about 1994-1996 on.

[986 Boxster]

Originally Posted by blue62

Using an oiled air filter on any car using a MAF Sensor and or a MAP Sensor is asking for problems.
So that's pretty much any car manufactured and sold in the USA from about 1994-1996 on.

I have K&N air filters on all my cars and never had any problems. The only reason I took it out of the Boxster was to clean it, I was planning on putting it back at the next oil change. After doing some reading that they might screw with the Maf sensor in the long run I might just leave it out.

[blue62]

Originally Posted by 986 Boxster

I have K&N air filters on all my cars and never had any problems. The only reason I took it out of the Boxster was to clean it, I was planning on putting it back at the next oil change. After doing some reading that they might screw with the Maf sensor in the long run I might just leave it out.

When I bought my Boxster a few years ago I got very interested in OBDII and how it functions.
So being retired I had lots of time to do research. I found that the hot film and the hot wire MAF sensors are very sensitive in many ways.
I found pictures of MAF sensors that were magnified (microscope). They showed how the coating on the hot wire and the hot film would erode under different conditions. like they had been sand blasted or dirt, oil coated.
Thus altering reliability or causing premature failure.
Some of those conditions were specifically different types of air filters. Convinced my that any oil type air filter is a no no.