This is my first cut at a modified CAI for my Comptech supercharger.

The original setup was a Bosch BPV in the neck going into the blower along with a bung for the crankcase ventilation. Blow-off is now handled by a Tial BOV in the blower outlet tube. Crankcase ventilation is now handled by a K&N crankcase breather mounted on the fender. Air is cleaned through a K&N Extreme air filter that is about 9" long and 6" in the base. I put the K&N down in the nose and opened the plastic (not the fake ducts) to provide a nice stream of fresh air. Tubing to get to the air cleaner is a 3" straight, a 3" flex hose and a 3" 90 degree bend pipe. The neck going into the blower is a bit rough right now (I did the best I could), but I am going to try to get Thermalflex to make me a new one. The issue is that the OD of the blower inlet is 3.25" and that's not a very standard size for tubing, hoses, etc. I had to modify the bracket that supports the headlight to create clearance in the fender.

Here is a view in the fender:



Here is the view from the engine bay:



Here is the view from the front of the car showing how I opened the plastic to feed the air cleaner (yes, I know I need to clean the bugs of the rad):



Future mods are:

1. The Thermalflex made neck going into the blower.
2. Rolling the edges on the intake pipes (just to make sure they hold).
3. Polishing the lower tube (I polished the top tube and it takes a long time).
4. Going to an oil catch can instead of a breather (although I am not getting an oil spillage now).

My parts used are as follows:

1. 12" x 3" aluminum pipe from Burns Stainless
2. 12" x 3" 90 degree pipe from Burns Stainless
3. 3" flex hose from Intense Performance (I found them on the web)
4. Tial BOV (got mine local, but can be had from a variety of sources)
5. K&N air filter (can be had from a variety of sources)
6. K&N crankcase breather (can be had from a variety of sources)
7. Small rubber hose to put around the fender opening to make sure the flex hose doesn't get cut
8. Several stainless hose clamps
9. Flat stock with holes to secure the 90 degree bend pipe in the fender well
10. Polishing wheel (used with my drill) and some rouge from Home Depot

This project took quite some time to get right and when the next generation of changes are done, I think it will be awesome. I don't know for sure how much it dropped my AITs as I have only measured on the dyno. Street driving at speed it should make a larger difference. I would be happy to help anybody that wants to do this. Also, once I get the part remade by Thermalflex, I will ask them to hold the specs in case anybody wants it.

Please provide your feedback and let me know what you think.

-YS

PS My motivation for this was that dyno testing *proved* that the Comptech air filter was over restrictive. The filter is going back to Comptech for testing as they found it unbelievable that my filter was so restrictive. I may have just had a defective one.

 

YS- Looks awesome. Great Job !!!!

 

Hi Pete,

We can talk more about this after the holidays, but I'd love to get your input when I start thinking about running ducting to cool my engine bay. On one hand, using the faux brake ducts (opened with the Coastal Metals airflow grills) in combination with some flexible ducting seems easiest. On the other, I might actually want to use those to vent the brakes!

 

YS- Good job does the BOV make much difference?? it may be me just being numb but I have'nt heard of anyone else with a BOV on a Comptech as I did'nt think it was possible to fit one without messing up the power output.
This is one of the reasons I discounted the comptech & started looking at a turbo setup, but as you have one & it works???? "throw the Comptech back into the smelting pot".
Andy

 

[QUOTE]Originally posted by cbender
[B]Hi Pete,

We can talk more about this after the holidays, but I'd love to get your input when I start thinking about running ducting to cool my engine bay.

 

Thanks Andy.

The BOV doesn't effect power as it is closed when it really counts (WOT). The whole reason that Comptech went with the Bosch BPV to begin with was to get the CARB certification - I don't think power output had much to do with it. The only possible ramification I can think of is that with a BPV the unused boost is forced into the intake of the blower which may help with thottle response when going from vacuum to boost situtations....but I sure as heck haven't noticed it.....and the dyno isn't really going to show the difference either.

Having dyno tuned the car a lot already, I sort of have an idea what the car is going to do today during final tuning and when I post the results, you will see that there was no loss.

-YS