Well I installed the BBK 66mm TB last night and (more)
it kicks but!
Here's my intake setup so far (93 4.0L in a 88 BII)
I have a 4" heavy duty dryer hose running from the stock intake location (next to headlight). I removed the stupid plastic guard and cut the stock hole open to 4" dia. Used a 4" PCV toilet flange to mount the 4" tube to the radiator support. From there it runs under the battery tray and up where the AC canister used to sit (think 2.9L). For now I have the 4" tube feeding into the stock airbox, cut open a little to accept it. Used a staple to hold it in.
The airbox has a K&N drop in. For now I have the stock MAS and 93 intake hose (yuck!) Thats right boys and girls I still have the "air muffler" installed. What a joke! I like it when people say, "I want to open up my intake but I dont want it to be loud" HAHAHAH! The air muffler is a joke, besides restricting the flow it also sits right on top of the radiator. Hmmm lets restrict the flow so it's quiet and then heat the air up! Great idea!
So thats next, I have a few tubes I'm working with now to replace the whole shebang. My problem is the huge 4 core aluminum radiator I got from Ford leaves little room between the 4.0L and electric fan in the BII. So the alternator and belt are right there. If I had a cowl hood or a slight body lift I would have enough room to simply run a 3" silicoln high temp intake hose. Working on that problem now.
Then once that is figured out it's back to a true ram air setup. This means a setup similar to the KKM but with my cold air feed tube mounted over the entire cone element. K&N makes these new cones with a open tip, that would work perfect. The problem is then where to mount the MAS and how to keep the water out. My old setup on the 2.9L worked great (see my site for pics) so I'll do something similar.
Ok so now back to the TB.
Keep in mind I live in Denver. It takes 20% more air pumping through the intake and exhaust to get back to sea level. (rule of thumb). So a mod like the TB up here has more of an effect. From driving it last night and this morning I can tell you there is a big difference. Not in overall power (best guess 3HP), I mean I definatley gained a few HP but the biggest change is in the high end and throttle response. She is much quicker to respond off the line and when passing. Really opened up the intake! Accelleration is much quicker, the tires want to break free easier. Passing is much easier and quicker.
The BBK unit is high quality, comes with everything you need and looks sharp. Much larger then stock. It mated up to the upper intake perfectly, no matching is needed. The throttle linkage needed a slight adjustment to get the base idle set. Installation took about 1/2 an hour, another 1/2 hour of testing
and another 15 minutes to disconnect the IAC and set the idle to 500 RPM.
I'm impressed. Now I want to see what happens when I get rid of the tiny MAS. At WOT even with the air muffler and stock airbox she growls. Personally I like a loud intake, but I'm sure it could be kept quiter with some heat tape and isulation. I also found some slight adjustment to the throttle cable necessary. I crimped a small piece of tubing (about 3/8") over the end of the cable (pedal side) to ensure quick response and a fully open butterfly in the TB. This was necessary because I am using a 93 Explorer throttle cable in my 88 BII, others may not need this.
She really scoots now...
I would reccommend this mod to anyone with a 4.0L. Especially high altitude or supercharger motors. It will probably not do you much good on a stock engine with the stock intake and exhaust, but it's a good place to start.
In addition to my intake mods I also have:
JBA headers
2.25" Dynomax cat back (soon to be 2.5" cat, 2.5" cat back with side exit)
electric fan
high output 4 core aluminum Ford radiator
Taylor spiro 8mm Wires
NGK Plugs
180 Robert Shaw thermo
all Mobile One Synth fluids
