The Ram Van filter housing is different than the Ram Trucks. The IAC behaves with some difficulty when the rear walls are removed. The IAC during idle has a very good chance to surge the RPMs when the mod is done all the way around.

As for the Hp and throttle response, the TB mod does offer that benefit for throttle response being instant. Therefore, no mashing the pedal and waiting for the delay to move the van, then backing your foot off because the fuel is gulped up. With the TB mod, the instant pedal response allows the driver a tamer foot, thus the fuel isn't gulped so hard on take offs.

With that said, my exhaust system on the van is a custom higher flow with a high flow CAT. So, the engine really breathes very well offering better Hp and total response. Prior to the mod, the exhaust and the tire upgrade, the van had power, but seemed like it had peep like a slow moving diesel. Now it just moves. The 5.2L/318cid really rivals over the Ford 5.4L Econoline that has some peep, but levels out quickly to being a dog.

Best of all, the Hp increase and peep, the MPG gets better.

 

am i reading this right, or completely wrong?

if i do the tb mod, then the iac works worse than stock? i definitey don't want that

 

You are reading it wrong; if you perform the modification correctly the IAC operation is unaffected. Proper method is to grind away the front circular wall but leave the rear circular wall untouched.

 

ok.... anyone got pictures on where to grind, and what exactly? even a pic with ms paint arrows would be nice... i am a complete newb, and don't want to mess up my DD

 

Here's a pic of a TB from a 1997 3.9L V6. I did a pencil outline of the two sections of front wall that would need to be removed for the mod. If you really wanted to get aggressive I think you could probably remove the "nubs" on both the left and right side of the TB surface and the small sections of wall behind them, too.

Not sure if Fastman does it this way or not. I think there was also some discussion about putting a bevel on the inside lip of both bores of the TB. If you look carefully at a pic of a Fastman TB you can see how this is supposed to look.

 

Rusty, Great write up and photo. As for removing the "nubs", that is very questionable since it blocks seeping air towards the IAC. Any seeping extra air to the IAC can cause IAC surge for the idle.

Yes, the Fastman does bevel/round the sharp edges going into the barrel. I did my TB like that as well.

NOTE: keep the area between the two black circles with the threads. This holds your air cleaner in place !!!!