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Hi Guys,
Car is running pretty good, maybe not perfect. That doesn't stop me wanting to work on other projects. One of them is the cold air intake.
On Carl's supercharger kit for the L-jet there is a cone filter placed behind one of the two intake apertures above the radiator. This brings some cold air, but also some warm air. I decided to try a 4" inline filter attached to the 3" supercharger intake via a low profile 3" elbow. That puts the filter intake very close to that aperture, and I wrapped the junction with some heat wrap. It looks decent, and we will see how it functions. I always disliked the idea of ditching the original 928 cold air intake, and wanted to restore it.
Thanks,
Dave
Last edited by j.kenzie@sbcglobal.net; 04-09-2018 at 12:05 AM.
Hi Carl,
It is a great kit, and it transforms the car. No dyno numbers, but I still remember the first full throttle pull after install. It was a different car. I have had no problems with any of the kit components, and there are still enough little tweaks to fool around with to keep the hobbyist in me occupied. It is the best single thing I have done for the car.
Now, on the negative or rational side of the coin, for resale I'm not sure it makes total sense. Also, I could have sold my car and bought something else for the money spent. I mention these things just so nobody thinks I'm crazy. I would not change a thing and I'm totally happy with the supercharger.
Thanks,
Dave
My '79 is a similar setup but K-Jet. Carl has dyno #s from it he can post up but remember it being about 350 in both HP & Torque. If the cold intake works out, let me know if you'd be interested in supplying a 2nd one.
My '79 is a similar setup but K-Jet. Carl has dyno #s from it he can post up but remember it being about 350 in both HP & Torque. If the cold intake works out, let me know if you'd be interested in supplying a 2nd one.
No problem It's mostly off the shelf parts.
Thanks,
Dave
You have a good memory. Here is your dyno chart. Your '79 made 292 HP at the tire with our Stage II kit. Using the 15% conversion factor for drive-line loss, that's 343.5 HP at the engine. Stock on your car was 219 HP.
You have a good memory. Here is your dyno chart. Your '79 made 292 HP at the tire with our Stage II kit. Using the 15% conversion factor for drive-line loss, that's 343.5 HP at the engine. Stock on your car was 219 HP.
Thanks Carl 👍
I'm still thinking about going down one pulley size and also need to look to see which impeller is in my Powerdyne as there might be some more gains if I don't have the upgraded spiral one.
Hi guys,
Mark Kibort asked about the general supercharger layout. So in case you didn't already know, here's how it works:
Petza shows a nice picture of the intercooled kit. His is K-jet, but L-jet piping is the same. Basically the supercharger sits where the belt-driven radiator fan used to be. It draws air in from the DS front of the engine compartment. then pushes it out through a 3" pipe that goes up the PS to the rear. It enters the intercooler, then that discharges directly into the air flow meter. The intercooler is liquid cooled from a heat exchanger in the DS front wheel well. Electric fans are added for radiator cooling.
Take care,
Dave
Last edited by j.kenzie@sbcglobal.net; 04-09-2018 at 02:24 PM.
I cleaned things up a little. I got rid of the heat wrap, and used a 3" to 4" 45 degree silicone elbow (with about 2" cut off each end) to connect filter housing to 928 intake aperture. The kit consists of one low profile 90 degree elbow; one 3"/4" Spectre inline filter; one 3" to 4" 45 degree elbow:
Carl's kit comes with the aperture piece on the DS only, and the piece itself is shaved. You can see it in Petza's picture. Here's how is looks complete:
That looks superb! Thanks for the shopping list. I found the comparable pieces in red to go with the rest of my under hood color scheme. I've wanted to do this for a while so thanks a lot for making it easy.
That looks superb! Thanks for the shopping list. I found the comparable pieces in red to go with the rest of my under hood color scheme. I've wanted to do this for a while so thanks a lot for making it easy.
It should fit fine. Yours looks just like mine. Notice I removed that 45 degree 3" metal piece, and you may need to loosen and rotate the main SC discharge elbow just to get things to line up. Cutting the silicone is a PITA. I used a hose clamp as a guide and a new utility knife blade.
Good luck and thanks,
Dave
Last edited by j.kenzie@sbcglobal.net; 04-12-2018 at 09:03 PM.
Appreciate the nice neat job you have done there and the logic is sound but have you checked the rated capacity of the air filter element you have installed?
FYI- I have Roger's EIS system that has two Spectre elements a size bigger [5 inch casing] than yours and my power output is less than yours. If there is a detrimental loss it will be more apparent towards the end of the usage cycle prior to cleaning and it just may be that you have to clean the filter more often. I did a check on the Spectre website but could not find any data for filter capacity but the sectional area for air flow will [I suspect] be considerably less than the filter unit Carl originally supplied with your kit. I also appreciate my system capacity may well be much bigger than actually needed.
Bottom line your supercharger delivers a fixed compression ratio- lower the inlet pressure and the discharge pressure will be lower. Whether the increments we are talking about are relevant/significant I do not know.
Trust the above informative- not intended to be alarmist as I see no dangerous consequence. You might lose a few ponies somewhere along the line but nothing more than that or so I suspect.
04-08-2018, 07:45 PM
My cold air intake for SC 928S
