springs and tb

[shawnxj]

The 4.7 Dakota TB i have has the part where you attach the cables adapted to fit in the Jeep. The other end for the TPS and IAC work fine even with RENIX Electronics (besides adapting TPS anyway).

good to know that's man

[FlyinRyan]

It's an easy 10 hp (or more) ......

Ryan, at what rpm do you start seeing noticeable hp gains? Great tip on the 4.7 tb. I'll keep a eye out for one at the junkyard!

Sorry for the slow response, been a little busy lately.

It's going to depend on the overall config. On a 4.6 with a 10:1 CR, ported head flowing ~245 cfm, 208/214 111 LSA cam, and a 99+ manifold, one of my custom PCM calibrations, and a 63mm TB (I believe it may have been one off of StrokedJeep?) appeared to start building vacuum at WOT IIRC 2000-3000 rpms, rising linearly (as WOT MAP KPA continued to fall with rpm). After installing a 68mm 4.7 TB that was ported to my specs by the owner and hogging out the manifold inlet to match, he noticed both WOT and part throttle gains above 2000 rpms. On the tuning side of things, not only did I see that he gained power down low, but it continued to carry the torque higher through the rpm range. The tapering off of torque past 3500 was not as significant as with the previous setup. So it truly made a difference in not only the way the truck drove on the street, but it made his vehicle more powerful at virtually any rpm.

The underlying issue (no pun intended) with swapping to this large of a TB, is that the intake manifold as I recall is not large enough in diameter and will require porting the inlet itself to get the most out of it.

[FlyinRyan]

It's an easy 10 hp (or more) ......

Ryan, at what rpm do you start seeing noticeable hp gains? Great tip on the 4.7 tb. I'll keep a eye out for one at the junkyard!

Sorry for the slow response, been a little busy lately.

It's going to depend on the overall config. On a 4.6 with a 10:1 CR, ported head flowing ~245 cfm, 208/214 111 LSA cam, and a 99+ manifold, one of my custom PCM calibrations, and a 63mm TB (I believe it may have been one off of StrokedJeep?) appeared to start building vacuum at WOT IIRC 2000-3000 rpms, rising linearly (as WOT MAP KPA continued to fall with rpm). After installing a 68mm 4.7 TB that was ported to my specs by the owner and hogging out the manifold inlet to match, he noticed both WOT and part throttle gains above 2000 rpms. On the tuning side of things, not only did I see that he gained power down low, but it continued to carry the torque higher through the rpm range. The tapering off of torque past 3500 was not as significant as with the previous setup. So it truly made a difference in not only the way the truck drove on the street, but it made his vehicle more powerful at virtually any rpm.

The underlying issue (no pun intended) with swapping to this large of a TB, is that the intake manifold as I recall is not large enough in diameter and will require porting the inlet itself to get the most out of it.

The 99-00 4.7s are indeed 65mm diameter. The 01+ TBs are 68mm. I know this to be fact, I've ported probably 50-60 4.7 TBs over the years and also owned a 4.7 WJ at one point. The Jeeps had the correct TB type from 02-04, whereas Dakotas/Durangos went to the later style NGC PCM and a 1 bolt IAC (i.e. not compatible with older vehicles, unless you rewired your IAC harness) in '03.

[shawnxj]

have a mustang tb sitting in the garage and waiting for the 4.7 i picked up to get here...should be here by friday. i'll have a machinist buddy of mine make an adapter plate if needed but just comparing the smaller mustang tb it looks like it won't be necessary and other then hogging out the tb hole in the intake it should only need 4 holes drilled and tapped but i need to make sure the aluminium is thick enough in those areas