What all can be removed?

Mike Hall · 03-12-2011, 09:02 AM

I know a Porsche is nothing like the only fox body mustangs I used to play around with but can you still strip off all the emissions parts from them and get away with it? If so, what all can i remove without lighting up my dash like a Christmas tree? I am not really looking to increase power but more like loose weight and clean up the cluttered look of the engine. I have the engine out of the car for a week so now is time to remove it of any unnecessary parts. Any info on this subject would be great.

BTW, I do plan to keep AC, and heat as this is a street car but I am not so much worried about the emissions part down here in South GA.

Mike

Tyson Schmidt · 03-12-2011, 09:58 AM

There really isn't anything you can remove unless you have a late 993.

If you have an OBDII 993 then you could eliminate the SAI system. (secondary air injection)

If you have a 964, or an OBDI 993 then there really isn't anything emissions related other than exhaust, that can be removed. Modern fuel injection and 3-way cats took care of it.

Mike Hall · 03-12-2011, 10:00 AM

Thanks for the info. I have a 92 964 so i guess I am stuck with the the mess thats all over this engine. hahaha

TMc993 · 03-12-2011, 04:42 PM

Quote:

Originally Posted by Tyson Schmidt

There really isn't anything you can remove unless you have a late 993.

If you have an OBDII 993 then you could eliminate the SAI system. (secondary air injection)

If you have a 964, or an OBDI 993 then there really isn't anything emissions related other than exhaust, that can be removed. Modern fuel injection and 3-way cats took care of it.

My understanding is just the opposite of what is stated above...According to what I have read, if you have a 964 or an OBD I 993, then you can remove the emissions junk and the SAI system. If you have a late model (1996-98) 993 with OBD II, then you're screwed...Remove any of that stuff and you'll have a permanent CEL lit up on your gauges...Go to Rennlist.com and search on OBD I versus OBD II. You'll find a lot of info there.

BenBgood · BenBgood's Garage

In addition you can retain heat (at least enough for GA) and remove that giant black electric blower fan. You would then replace it with ducting known as a "cup heater pipe" . Heated air will still be moved through the heat exchangers into the car by the primary fan (the main belt driven one). The electrical secondary is just a "booster fan".

Originally Porsche made this item out of a black plastic. Now you can find some trick Carbon fiber bits ranging from $200-$400. I believe I picked mine up from Maxspeed Motorsports (a Canadian based distributer, pretty sure CF-Part came out of China) for around $200 and its nice.

As far as exhaust, I have and '89 C4; Contrary to most of the current and old cars, they don't even put mine on the dino or plug it into a computer...they check the gas cap and use their "sniffer" at idle by the exhaust and send it on the way... You could really shave some weight by simplifying the number of mufflers (stock has a primary and secondary. You could also make a lot more power by letting it breath better. I understand the exhaust on the 964 to be very restrictive...

BenBgood · BenBgood's Garage

You can also get/make tubing and a cone filter, and remove the factory air box ahead of the AFM...it would "open up" the bay fairly symetrical if you loose the secondary heater blower...

Tyson Schmidt · 03-12-2011, 09:14 PM

Quote:

Originally Posted by TMc993

My understanding is just the opposite of what is stated above...According to what I have read, if you have a 964 or an OBD I 993, then you can remove the emissions junk and the SAI system. If you have a late model (1996-98) 993 with OBD II, then you're screwed...Remove any of that stuff and you'll have a permanent CEL lit up on your gauges...Go to Rennlist.com and search on OBD I versus OBD II. You'll find a lot of info there.

You can't remove something that doesn't exist.
OBD1 cars don't have anything emissions related to remove.

BenBgood · BenBgood's Garage

Quote:

Originally Posted by Tyson Schmidt

You can't remove something that doesn't exist.
OBD1 cars don't have anything emissions related to remove.

...Other than a catalytic converter

...but the O2 sensor is "down-stream" so you can delete this relative restriction and not set off any lights as long as you remount the O2 sensor in your "cat bypass solution"

...(edit)right you mentioned that in your first post

Don Plumley · Don Plumley's Garage

Quote:

Originally Posted by Tyson Schmidt

You can't remove something that doesn't exist.

Very Zen, Obi-wan...

craig001 · craig001's Garage

Buy my DP Primary Exhaust Bypass to replace your stock unit. Lose some weight and improve sound. With this one you could run a g-pipe as well without being too loud or obnoxious for everyday use.

Mike Hall · 03-13-2011, 04:38 AM

Thanks for the info. I guess if there isn't anything to remove then that means all the clutter all over the engine must stay. hahaha

I do plan to remove the heater blower and I just might install a cone filter on the AFM as well. I kind of had plans to modify a set of 996 headers with new flanges then build a header back system with a dual in dual out muffler. After a lot of reading I am not sure its even worth the trouble though. I the stock exhaust stays on the car, I will build a cat and primary bypass.

Thanks
Mike

BenBgood · BenBgood's Garage

Regarding custom fabrication of a header exhaust from a stock "parts-bin"; you may want to start with a set of 993 headers then...My understanding is that they offer significantly better flow over the stock 964 and (I have not tried) should mount directly with little/no modification to your existing set-up...Depending on how involved you want to get

The other opption is to do a web search for "964 exhaust/ headers" there are a lot of fabricaters (besides Fabspeed) and some nice straight pipes at reasonable rates, that bipass the cats and secondary mufflers going straigh into a single, double, or x-pipe cross over set-up...they'ed bolt on and look to be pretty mean ;-)

Flieger · Flieger's Garage

What do you mean by "clutter" on top of the engine? You can remove the AC. You could do a custom individual throttle body EFI setup or carbs- it just takes a lot of work and your 964 might not like not hearing from the engine. Peopl use 964 cases in early cars often.

Mike Hall · 03-13-2011, 10:55 AM

I think most of the clutter will be removed with the heater blower but I was also talking about all the vent lines and vacuum canisters and well just all the clutter which must be used for other purposes than emissions. I think with the absence of the heater blower it will look much roomier and less cluttered.

Mike