TBIThrottle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.
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I finally finished my ram air setup on my car. It is a hybrid of TBI and TPI ram air posted in the tech articles. I changed out the upper air dam to the TPI one and followed the directions for making that part of the ram air. I used 7" rigid flexible aluminum ducting to go from the 2 scoops in the front to the opening of the tpi snorkel. I finished off the inside with that aluminum tape to smoothe it out and make it stronger. from there I bought a 6" air cleaner (toss out the filter it comes with), 7" Metal duct, 3" metal duct, and 3" rigid flexible duct. (not dryer hose)
I cut a 3 1/2 strip out of the 7" piece and riveted it to fit inside the lip of the air cleaner.
I used a 3" hole saw to cut the opening for the 3" metal duct.
I then took the 3 " metal duct and cut it to about 6" long, stuck it through the hole and cut flaps to fold it in place. I riveted it in place there.
After that I had to cut the riser off of the bottom of the air cleaner. If you dont it will be too tall. Take it and put it over the stock air cleaner spacer ring and RTV the hell out of it. This serves 2 purposes. 1, it helps keep it in place, and 2, it keeps the massive amount of air coming into the newly confined changer from blowing gas from the injectors all over the place.
Once the bottom is dry your ready to do the finishing touches.
(Before you RTV the rest make sure it all fits good and make the nessecary adjustments. )
First put the air cleaner base on, Then run a bead of RTV around the inside of the filter lip. (this can be done outside the car but be sure to align the spacer ring first).
Place the metal ring you made inside this lip with the 3" tube facing the front ot the car.
Run a bead of RTV around the inside lip of the top of the air cleaner and put it on.
Once this is done put in the TBI and screw it down.
At this point you want to take the flexible aluminum ducting and run it from the back of the TPI to the tube on the front on the new air cleaner.
Make sure you secure the tubing, I used duct tape and covered it with the aluminum tape for appearance, and put TPI filters into the intake.
Your ready, let the RTV dry for an hour and adjust you fuel pressure regulator for more air. Have a nice ride.
Contact me with any questions and picture requests. If someone can give me an email address of the site administratoe I will get it posted in the tech articles.
On my RS I had this trick ram air setup going...I had dryer tube run to the high beams (use a L69 dual snorkel cleaner) and I removed the high beams and placed screen there...if you're good, it can look cosmetically decent. Big power gain too.
I'd been thinking about doing something like that for a long time, I just never came up with a good way to adapt it to the TBI! Did it seem to help much?
__________________ Sold!: 1988 Camaro S/C
(Didn't want to post a thread about it, don't wanna get flagged for non-tech)
Presently Driving: 1996 Mustang GT
4.6, 5 Speed, every option but power passener seat.
Don't worry guys, I'll have another 3RDgen someday.
Originally posted by exdog I think it made a good bit of differnce. nothing phenominal but every little bit helps. I'm sure this setup on a TPI would be much better.
I had a similar ram air setup on my '85 Z28 TPI 305. I did notice a small power gain at speed. I think it is a worth while mod regardless of which induction you have.
i have got that same mod. instead of the dryer hose, i used a gutted MAF and the plastic tubing that originally went from the intake housing to the single snorkel. i used a dremel to cut off the housing right between the housing and the thermac. i am at a computer right now that i dont have pics on, but i will post some later today. i shaved off .3 in the 1/8 with just this set up, new coil, cap and rotor, and a 3"high flow cat. did all at the same time so dont know which one helped the most
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