[DayDreamer]

<!--quoteo(post=81114:date=Oct 2 2009, 12:43 PM:name=Johannvb)-->QUOTE (Johannvb @ Oct 2 2009, 12:43 PM) <{POST_SNAPBACK}><!--quotec-->Where do you have your car serviced? I still have my 356 with Peter Dorfer at Carrera Motors. They are a great bunch of guys.

Apologies for being off topic [img]style_emoticons/<#EMO_DIR#>/ohmy.gif[/img]<!--QuoteEnd--><!--QuoteEEnd-->

Carrera Motors... Yeah great bunch... used them for the last 7 years.. for the 944 S2 and now the 968.

Partial Post: Please Login or Register to read the full post.

[rhudeboye]

<!--quoteo(post=81110:date=Oct 2 2009, 03:50 AM:name=jaap)-->QUOTE (jaap @ Oct 2 2009, 03:50 AM) <{POST_SNAPBACK}><!--quotec-->Nobody thinking about the SC setup discussed/developed a few months ago?<!--QuoteEnd--><!--QuoteEEnd-->

Good point. I kinda forgot about that. And considering the cost of a full header + cat job. its really worth looking into.

Partial Post: Please Login or Register to read the full post.

[prj24149]

Airbox 4 hole mod with stock air filter
RSBarn chip and catback

Partial Post: Please Login or Register to read the full post.

[94SilverCab]

Don't want to open a subject that has been beaten to death, but you are losing horsepower by not having the K & N.

Running for cover...

Jay

Partial Post: Please Login or Register to read the full post.

[johns_968]

Jay

I guess I would not classify it as losing horsepower, more like not gaining as much as you could with K&N.

How are those wheels holding out? Still sparkly clean?

Partial Post: Please Login or Register to read the full post.

[94SilverCab]

Sadly, I needed to use my brakes on the way home, but it should be easier to keep them clean now. And yes, gain is less than could be expected with K & N

Jay

Partial Post: Please Login or Register to read the full post.

[DayDreamer]

<!--quoteo(post=81111:date=Oct 2 2009, 12:18 PM:name=DayDreamer)-->QUOTE (DayDreamer @ Oct 2 2009, 12:18 PM) <{POST_SNAPBACK}><!--quotec-->Thats very possible with respect to tires... not so sure about an exhaust...

Does any body have a photo of the underbelly of a US 968, a european 968. I will go past my garage on saturday and if they have a lift free, I will take a photo of my underbelly (the car's, not mine) [img]style_emoticons/<#EMO_DIR#>/smile.gif[/img] and post the pic. I will also ask the guys at the garage as they where the original Porsche importers in the 90's.<!--QuoteEnd--><!--QuoteEEnd-->

Excuse the picture quality. I stopped at the garage and spoke to the guys... as you can see from the pic, my cat has been cut out and a straight pipe fitted. (Surprise)

South Africa only got un-leaded fuel around 1995, so any vehicles that were imported from europe with Cats generally had the O2 sensor disconnected. The porsche guys and the big engined merc guys ended up cutting the cats out.

Partial Post: Please Login or Register to read the full post.

[flash]

yeah - that's what i figured - it is my understanding that all of the standard cars shipped with the cat - ROW cars did not have the same emissions connections electrically though

1995 was the beginning of OBD2 - our cars are OBD1, and have a lot less stuff going on

Partial Post: Please Login or Register to read the full post.

[DayDreamer]

There is always something more to learn with these cars... [img]style_emoticons/<#EMO_DIR#>/smile.gif[/img]

Partial Post: Please Login or Register to read the full post.

[flash]

no worries - it's always a bit of an archeological expedition when dealing with a pre-owned car - sometimes it's fun

Partial Post: Please Login or Register to read the full post.

[DayDreamer]

Sometimes its NOT [img]style_emoticons/<#EMO_DIR#>/sad.gif[/img]. I just found out that he PO cut a hole in the vent duct at my feet BEFORE the heat cut off value. god its getting hot in here.

Partial Post: Please Login or Register to read the full post.

[mattipuh]

<!--quoteo(post=81137:date=Oct 2 2009, 08:41 PM:name=94SilverCab)-->QUOTE (94SilverCab @ Oct 2 2009, 08:41 PM) <{POST_SNAPBACK}><!--quotec-->Don't want to open a subject that has been beaten to death, but you are losing horsepower by not having the K & N.

Running for cover...

Jay<!--QuoteEnd--><!--QuoteEEnd-->

I abit disagree on this. My friend (who is currently running "S3" (i.e S2 with a heart from 968) lost few hp's in his S2 a year ago. S2 2nd cyl was damaged which led to engine swap - most probably because of oiled K&N filter had let some S**t flow to the engine.
So, in engines, espec with MAF's, wouldn't use oiled filters. you destroy your engine, eventually (if u're not oiling it every 2 weeks), and also destroy MAF with excess oil.

I'm running with stock filter in drilled box - replacing filter once or twice per year (so far twice), and am happy with the hp given. . .

Partial Post: Please Login or Register to read the full post.

[flash]

it is extremely unlikely that anything damaging got past the filter - over oiling is what causes most problems with the K&N, which would indeed screw up the MAF - it is far more likely that something let go from inside the engine, resulting in damage - the head gaskets are known to disintigrate, and pieces of those frequently are the culprit - it takes something pretty big to cause a single cylinder damage failure - if it were something that got past the filter, you would see a hole in the filter

also, to be clear we are specifically referring to the particular filter for our airbox, and not a cone, which might either be smaller in surface area, and thereby reduce air input, or located in a hot area, which would also reduce power

in other words, the application is critical to the result

Partial Post: Please Login or Register to read the full post.

[rhudeboye]

Yup, It was the placement of the cone that bothered me as well. The one I saw was resting close to the engine w/o a back shield.

Our boxes are only allowing outside air in and blocking out all the engine heat around the box.

Partial Post: Please Login or Register to read the full post.

[flash]

yup - i've done a LOT of work to tune the air in the engine bay, lower the under hood temps, force more cold air into the airbox, and keep separate the intake air from the engine bay air - i have a couple more things in mind for the next couple of weeks, and should see more gains

lowering intake temps is everything when it comes to NA cars - so is surface area - setting a cone filter in the wrong spot, especially the ones that will fit in the engine bay, which all have less surface area than the stock filter, can easily cost you 5hp from stock - you can get a big one down in the bumper cover, but good luck cleaning it

Partial Post: Please Login or Register to read the full post.

[prj24149]

After rereading the airbox mod .pdf seems the biggest bang for the buck is going from -6.5 in Hg to -1 in Hg. Using the K&N gets you the extra -1 in Hg to 0 but is it really giving you that much more HP?
Plus the K&N cost +$40 and you have to clean and oil it where as the stock paper I just throw away once a year and costs ~$15. Yea over a few years you pay for the K&N but not for the hassle of cleaning it and oiling it. Also the concern of over oiling and fouling the MAF.
Do you all think the extra 1 to 0 in of Hg increases the HP that much or do you get most of the power gain in going from -6.5 to 1?

Partial Post: Please Login or Register to read the full post.

[flash]

the dyno says yes - about 40% of the power was from the improved flow of the K&N - i know the restriction measurements don't seem to indicate it, but that's the way it worked out nonetheless

Partial Post: Please Login or Register to read the full post.