Velocity Stack on a 930- any experience>

[OldSpool87]

Hi all,

I have searched the forum on this and found one mention by Cole930 (though he may have been joking...) I know that they are used on carbureted cars, but I don't know about CIS.

I am planning a few upgrades to my 1987 930 this winter which will include a long neck IC. As far as I can see, all longnecks require some modification to other components including the factory air box.

It has been discussed thoroughly here on the forum that the only benefit to aftermarket air box/filter is cleaning up the engine bay (and maybe removing some heat sink). For my purpose, I thought switching to a cone type or other air filter arrangement might serve to avoid and be more simple than an air box mod.

I came across a post of a polished aluminum velocity stack/filter that looked pretty slick. However, I am suspect of its use given only ONE mention in the entire forum...

So, has anyone tried out a velocity stack?

Thanks for the feedback and Happy New Year!!

Will

[oilonly]

Can't respond to the velocity stack question but i will tell you that you can use the stock air box with a long neck intercooler. Best thing i have seen is that K@N cone filter or the BMC filter that i am using.

[JFairman]

A big velocity stack on the CIS air flow meter won't make any difference on a street car other than all the dirt the motor will be sucking in with no air filter that will eventually destroy it.

I think the only longneck intercooler that will need the stock airbox modified is the old over rated RUF. The others are all made to fit with no modifications.

Another nice thing about a longneck interccoler is all the free space under it with the origonal boost recirculation blow off valve/manifold removed. Some guys even put a puller fan on the bottom of a longneck intercooler to come on at stoplights or when needed to prevent heatsoaking.
Or you could put a sub sandwich or two wrapped in aluminum foil under there to heat them up before eating.

[oilonly]

............

Or you could put a sub sandwich or two wrapped in aluminum foil under there to heat them up before eating.

[OldSpool87]

Thanks for the replies and laughs! I opt not to destroy my engine and will keep sandwich warming options open.

[mark houghton]

Originally Posted by oilonly

............

Actually, I prefer to stash a frozen pizza under the IC, so that when I get home from the store it's ready to eat. Gives me a reason for a few quick hot-laps to get her up to operating temperature. Nothing like a good turbo pizza to cure the munchies....

Back on topic. Velocity stacks have their place on individual throttle body setups, provided they're housed within a huge air cleaner box. My old '72 Targa with mechanical fuel injection basically had velocity stacks....those OEM intake stacks were a good 8 inches tall.

[cole930]

Factory 934




The Old Sled







No Joke !!!!


Cole

[Andy 930]

I agree with cole930. I run a stack when racing quarter mile events. cis and consistant 11.3 @ 127mph!

[OldSpool87]

Thanks Cole! I'll likely stick with the K&N set up as my car sees 4 or so DE events and is a weekend type ride.

I am curious though if your velocity stack has any filtering qualities or is it purely a performance item. That seems to be the trade off.

Thanks again to everyone for chiming in and offering up shared knowledge!

Will

[cole930]

Will:

I am probably going to be a great disappointment in your quest for any
scientifically supported explanation for why one would choose to use a 934
intake stack on their 930 . I attribute it to nothing more than a 38 year love
affair with the Porsche 934.

I haven't the slightest idea as to any performance enhancements it may
or may not give us. I did it because I had never seen a street driven 930 with
the CIS relocated and the intake stack and it's real old school cool. I was just
sitting here waiting to die anyway.

As to the issue of debris entering the engine. Unless I go hunting for
gravel roads to run up and down. I'll be in the home before ingesting enough
dirt to do any damage and I do have a plan B.








Cole

[OldSpool87]

Cole,

Never a disappointment to get honest feedback! In all honesty, my initial inquiry to the forum was prompted by the fact that these things are shiny and "velocity stack" sounds cool. That's one neat car you have and a beautiful TK IC.

Will