marineusmc4

Ok so i just got a tune done and it went shitty. The tuner said that the cam i put in made no power. He said that it actually took away power from the truck. truck is in my signature. Only mods are long tubes, k&n cai, and a cam swap. here is the cam info- Comp Cam XFI™ RPM, XR269HR part #54-414-11
specs: rpm range 1300-6300
valve timing .006
lobe separation 114 degrees
intake centerline 112 degrees
intake exhaust
valve lash hyd hyd
duration 269 273
duration @ .050 lift 216 220
valve lift .525 .532
lobe lift .309 .313

i installed comp cams 5/16" 7.4" long hardened pushrods (part number 7955-16) and comp cams beehive springs part number 26915-16. i talked to several different people from both comp cams and summit racing and was told by every one i talked to that these components would make significant power over stock. the only difference the tuning made was the idle. went from around 5-600 to 900ish. it dynoed at 238, yes thats correct, 238. its always ran like a champ so here is my question. is this cam smaller than a stock cam or is there a chance i somehow messed up the install/or received the wrong cam?

Chevy_King1500

iTrader: (7)

did you line up the cam dot to dot with the crank gear?

batboy

iTrader: (6)

Assuming the cam and supporting components were properly installed, I'd say you need a new tuner. That cam should definitely make more power. Might want to double check to make sure you got the right pushrod length.

marineusmc4

yep, perfectly, and triple checked just to be sure. at first startup up there was no noise, started like normal, sounded like normal except for the lope to it.

marineusmc4

that part number and length of what i installed is what was recommended by both comp cams and summit racing. do you think maybe theres a chance that the cam is right and that the reason power is lacking is cuz the rods need to be shorter/or longer?

batboy

iTrader: (6)

The stock pushrod length is 7.4" like what you used and if that cam uses stock base circle it should be ok. But, I always like to check and measure things myself to make sure.

I don't know who your tuner is, maybe he's great, maybe not. But, tuning for a bigger cam does require advance tuning skills.

marineusmc4

im not trying to sound like a dumbass but in a way i am cuz all this is new to me. but where would i find out if that cam uses a stock base circle? call up comp cams? or should it be on the spec sheet that came with the cam?

batboy

iTrader: (6)

If Comp Cams recommended the 7.4 pushrods, I'm assuming the cam base circle is probably stock sized. To measure pushrod length, you need a Comp Cams adjustable pushrod. Do a search over at LS1tech to see how to do the actual measurements. I'm still leaning toward inadequate tune though. Did the tuner use a wideband? If so, what was the WOT A/F ratio? What was the injector duty cycle? Are you throwing any codes? I'd probably do a compression check just to eliminate that from being a problem.

gamble686

iTrader: (3)

Normally it is good practice to measure for pushrod length using a pushrod length checker. I would say without a doubt your tuner is an idiot or something was installed wrong. It could be something simple that was missed or your tuner hasn't ever tuned for a Cam. That cam has been proven to make power many times. You should have picked up at least 50hp.

marineusmc4

this is his website. justune.com He is supposed to be one of the best tuners in kansas city.