5R55E Max Horsepower

[Broosedamoose]

I found a local shop that said they can make a set of Stage 3 heads for me and then dyno tune the PCM. "Supposedly" they have done them for the V6 Mustangs and achieved an average of 35-40 Hp over stock. That seems like a lot from just porting/polishing the heads and re-grinding the cams but maybe with tuning it's possible. With just a CAI, headers, an electric fan and an SCT X4 I notice a significant, seat of the pants, increase in my truck. Anyway, if they can get just 30 Hp, I'm wondering how much the stock tranny can handle!

 

[RonD]

Its the torque number that matters more than horsepower

The 55 in the 5R55E stands for 550ft/lb of torque

4.0l SOHC has 238 ft/lb stock so you have some head room there, if you stay lower than 300ft/lb you should be OK

Torque is what gets you up to speed, horse power is what keeps you at that speed
So the most stress on trans, driveshaft and rear axle is getting up to speed