well i got a rcsb 2wd h/c(224/581/112,wcc heads) 5.3.truck had dynoed 385 prior on a friend truck in 80 deg temps with stock truck intake(78mm).now i put a tb ss intake manifold(90mm), ls2 throttle body, with tac mod.(is said to only open 85 percent?)the iat was 140 and outside temp was 105 deg.so the truck put down 354/370 a/f at 12.7. so i was trippn on it . dont know if the throttle only opening at 85 per. is killing it that bad or was the heat doing it? i think its like 40 hp down. so im lost on it any help would help

 

140* IAT is pulling alot of timing and possibly that TB not opening all the way is where your power went.
Humidity plays a big difference also.

 

was told there was 20 percent humidity

 

what was the humidity on your first pull and the latest pull with the extra mods..


also did yall have a scanner hooked up to show the TPS?
If you select the wrong PID then its only goin to show 84-85% TPS.

 

I cant even read this. Your friend dynoed his truck and made 385 but your truck dynoed 354?

 

i see now.. i thought it was the same truck...

Different engines are goin to react different with the same setup.. also the timing plays a big part..

 

yup i did this set up for a buddy , then he sold me the motor and before i put it in i bought the tb ss intake plus whats needed to make it work. now i got the truck running and took it to the same dyno but in the heat. dont know the humidity when my friend dynoed his truck.

 

same tune?

heat and humidity makes a big difference.

 

yeah, 2 other guys which were gettn tuned said they were down like 30 hp, but dont know if heat can kill the hp that bad?

 

not the same tune but same tunner. needed a retune 4 the intake