I have been looking on ebay and the stock 65mm T/B's are pretty cheap. But what year will work. I know there is modding involved, I've researched what to do. But what year 4.6L GT should I look for? 99-01 or 01-04
Pretty sure this will only work with the SVT UIM, as the opening is slightly larger (full 65mm) than stock. I know when I got my max extrude honed stock UIM back however, that they had opened up the inlet some (65-67mm range). For those of you on stock UIM's, it's not going to improve things. Thing being that your TB is nearly the bottleneck that your stock UIM is.
I would say don't upgrade to a 65mm t/b unless you have a very "well-breathing" 3.0L It is not necessary for any 2.5L unless they are force induced. The t/b is not a much of a restriction as people think, so be sure you need it before just throwing it on and expecting gains. I talked to Terry Haines about this for 1/2 an hour the other day. The larger size brings in more volume but with less velocity and you don't want to decrease intake velocity because it causes cylinder filling issues.
I was messing with it last night, but it will take some time to make the swap. I'm camping this weekend so I won't be able to. Maybe I'll have some time next week. It's more involved than just swaping the throttle cam/rotor assymbly from the SVT. You have to use the cam from the Mustang T/b cause the o-rings to either side of the butterfly are too close together on the SVT. Anyway, you have to either mod the Mustang throttle rotor or swap it with the SVT one. I'm not sure which way I want to do it yet. I'll do it and take pics next week.
Well, I did it! Not too bad, I used the SVT throttle shaft and linkage. I just had to cut the shaft a few millimeters each way to allow for the larger butterfly. So here are some pics.
Question, though: I was thinking of changing the intake setup. Put the MAF just before the throttle body, and then the intake tube w/vaccum lines. This way you don't have to worry about vaccum leaks causing stubling. Will this be safe??? I attatched a picture...............
This is an older thread, you may not receive a response, and could
be reviving an old thread. Please consider creating a new thread.
New Cougar Forum
A forum community dedicated to New Edge Mercury Cougar owners and enthusiasts. Come join the discussion about troubleshooting, builds, ZETEC, maintenance, performance, modifications, classifieds, and more!