My truck is a '90 f150 2wd regular cab 8 foot bed. I recently installed a remanufactured '94-up f150 roller 5.0. It has a few mods such as long tubes, timing bump, msd ignition, etc. It has the original AOD trans. I have a few q's for you guys concerning performance. Keep in mind this truck is a dd.

I am currently saving up to get my transmission rebuilt (or buy a monster transmission) and shortly after installing 4.10 gears in the rear. My question here is would it be worth it to go with a higher stall torque converter (2300-2500 rpm) to help with off the line power? Or stick with the stock stall speed?

Next question is about the cam. From research I have learned that this engine already has a decent camshaft and when paired with 1.7 rr's is very close to the specs of the off the shelf speed density friendly cams. I currently have the stock rocker arms, would it be worth the money to swap to the 1.7's? Or should I go with an aftermarket camshaft?

 

Once you get 4.10 gears you won't need a high stall converter IMO, it would also impact fuel milage. A longer duration cam will push peak power up into higher rpms and soften low rpm power which will also impact fuel milage, but 1.7 rockers will boost the powerband you have now.

 

Ok cool. I think I'm gonna go with these rockers http://m.summitracing.com/parts/crn-44746-16

 

Another question... my truck has way more power when the engine is cool, or right before it reaches operating temp. Its nice and snappy off the line and then when it warms up sometimes it feels kind of doggy. Is this due to the engine just being colder or is it something to do with the enrichment cycle at cold startup?

 

When cold, PCM (computer) ignores emissions, richens up mix to ensure engine does not stall, like they did in the old days.


So, yes, it might just be snappier when cold. impish

 

I wonder if there is a way to keep it this way..or would that negatively effect mpg?

 

If you unplug a sensor it will stay in open loop but you can expect fuel milage to go right in the tank.

 

the less time you spend in open loop the better for mpg. you can get resistors for the IAT to make the engine think its cold all the time, its ghetto and results vary wildly, but it is noticeable sometimes. that way you can run closed loop but the computer always thinks its cold so itll richen a little, or perhaps not at all. all depends on conditions.

 

I could try unplugging the sensor (the one below the throttle body) just for the heck of it. Just to see what happens

Edit: is this the iat sensor?