Trying to improve airflow in and out of the 3.slow, I decided to do the Intake Silencer Removal mod. I've seen some threads talking about it elsewhere but mostly for the 3rd gen motor so here's my own.
I could probably have figured something out with various bits of PVC or similar tubing and dryer hose and misc taps for the vacuum lines and saved some money, but I'm lazy so when I saw one of these universal air intake kits
http://store.summitracing.com/partd...SPE-8208&N=700+400068+315018+115&autoview=sku
http://martelbrothers.com/product.p...=0&page=&xid=daabae41ff2042e6321f704c347572ff
at Pep Boys, I picked it up along with an extra rubber coupler..
https://martelbrothers.com/catalog/Coupler-Reducer-Combo-3-to-3or-3-to-25-Black-p-16088.html
Went real quick.
I disconnected the stock breather/vacuum tubes from the silencer and intake tubing, removed the silencer and original intake tubing. Then removed one 4 inch straight section from the intake kit, put the second rubber coupler on the end, pulled both couplers out as far as they'd go while still allowing me to clamp them securely to the intake tube, and stuck the 45 degree bend end onto the throttle body and the straight end onto the airflow sensor opening coming from the airbox. The airbox end doesn't line up perfectly straight, but there's enough extra room on the rubber coupler to handle the angle.
The couplers are also 3" diameter while the stock intake is a bit smaller, but again the couplers will compress enough to take up the difference easily.
Pulled the rubber plugs for two of the holes in the center section of the intake kit and used two of the supplied plastic fittings (a medium and a large) to handle the stock tube that used to plug into the silencer, and I replaced the crankcase breather tube with the one supplied with the kit (cut down to length). Had to warm up the ends of that slightly smaller tube to make it pliable enough to fit over crankcase breather and large plastic breather fitting, but now it's nice and snug. Tightened everything up, and here it is.
Yes the tube is very shiny and the engine very dirty.. I may paint it all black. Matters little to me.
After driving it around hard, I also made sure that there's enough give in the rubber couplers (especially the one on the throttle body side) that it can soak up engine movement without a problem.
As for performance gains.. Hard to say. Can't hurt. I do wish there was some way to have a larger airflow sensor (that rectangular flapper) passage, because that's gotta be pretty restrictive.
ian
I could probably have figured something out with various bits of PVC or similar tubing and dryer hose and misc taps for the vacuum lines and saved some money, but I'm lazy so when I saw one of these universal air intake kits
http://store.summitracing.com/partd...SPE-8208&N=700+400068+315018+115&autoview=sku
http://martelbrothers.com/product.p...=0&page=&xid=daabae41ff2042e6321f704c347572ff
at Pep Boys, I picked it up along with an extra rubber coupler..
https://martelbrothers.com/catalog/Coupler-Reducer-Combo-3-to-3or-3-to-25-Black-p-16088.html
Went real quick.
I disconnected the stock breather/vacuum tubes from the silencer and intake tubing, removed the silencer and original intake tubing. Then removed one 4 inch straight section from the intake kit, put the second rubber coupler on the end, pulled both couplers out as far as they'd go while still allowing me to clamp them securely to the intake tube, and stuck the 45 degree bend end onto the throttle body and the straight end onto the airflow sensor opening coming from the airbox. The airbox end doesn't line up perfectly straight, but there's enough extra room on the rubber coupler to handle the angle.
The couplers are also 3" diameter while the stock intake is a bit smaller, but again the couplers will compress enough to take up the difference easily.
Pulled the rubber plugs for two of the holes in the center section of the intake kit and used two of the supplied plastic fittings (a medium and a large) to handle the stock tube that used to plug into the silencer, and I replaced the crankcase breather tube with the one supplied with the kit (cut down to length). Had to warm up the ends of that slightly smaller tube to make it pliable enough to fit over crankcase breather and large plastic breather fitting, but now it's nice and snug. Tightened everything up, and here it is.
Yes the tube is very shiny and the engine very dirty.. I may paint it all black. Matters little to me.
After driving it around hard, I also made sure that there's enough give in the rubber couplers (especially the one on the throttle body side) that it can soak up engine movement without a problem.
As for performance gains.. Hard to say. Can't hurt. I do wish there was some way to have a larger airflow sensor (that rectangular flapper) passage, because that's gotta be pretty restrictive.
ian
Last edited:
