went back to the dyno this afternoon to validate gains from the pacesetter lt's i installed and the tune tweaking with hpt, since my last visit in early may. well after a 2 hour session i left with pretty much identical numbers as i did in may. 292rwhp and 315rwtq. up front thx to Z284thgen for coming by and helping out. mucho appreciated jeff. also thx goes out to chris at tulsa dyno for sweatin it out in the heat with me.

now my concerns, jeff chime in here anytime - my last dyno session, no headers, air temp 90*F, 25* ign adv, COT & PE delay was enabled, PE enrichment multi was set to stock which resulted in a fat *** pig rich runs down to ~10.5:1, and runnning the stock air box with a drop-in k&n. the bitch put down 290/318.

going in for todays session i am thinking with the headers and killin the cot/pe delay, changing the pe multi for a leaner 12.6-12.8 afr at peak torque i should knock down an additional 20rwhp. not! granted it was hot as hell today. for the pulls average ambient in the shop was 105* and IAT seen 120* at the top of the runs. 1st run afr was flat at 12.9-13.0 with 24* ign adv.

for the next run i fatten up the afr to the to the stock afr/rpm ratios and pulled her to 5800 with 28* timing with the same results. changed the afr again for a target of 12.6 across the board, made some small changes to the spark table and pulled her again with the same results. no matter how much fuel or timing we poured in or took away the numbers stayed the same.

did the heat contribute to that much of a loss? am i airflow limited with the stock box, screened MAF and stock heads? i have a k&n 77 series cai, but they tend to temp spike real easy so i left the stock box in. help me out guys. i would have bet the farm the lt's would have giving something.

 

My TR224/122 put down 294/298 last week, if I remember correctly. Those are dynapac #'s which are betweeen mustang and dynojet numbers . My motor is box stock except for the cam and drop in filter. The IAT was 108 so I think that was hurting me, the stock airbox does not breathe! I need to have rick at synergy email me the dyno print out so I can give you more details to compare. What are the specs on your cam.
I am pretty happy with my results for having no headers/intake. Rick is an awesome tuner! We got those number with zero knock, we could have put more timing into it but the power was starting to level off, I know the stock manifolds are holding me back, but at least I have the sleeper look!

 

my cam specs are 272/280 210/218 .551/.551 112lsa. the temps today had to be killin my power. the iats were hitting 120 on each run. i was hoping to gain something since my last dyno without the headers. the tune doesn't seem to be the hold back as we swung the afr 13.0 - 11.0, and the timing 24-28 without any noticable change in power either way. i am starting to think i am limited by the stock air box or heads. i would appreciate a copy of your pull. here is a copy of mine back in may and i will post up the current pull as soon as i can scan it.

May Dyno Run

 

I pm'd rick@ synergy I will post them up as soon as I get them.

 

Temperature does not have an affect on dyno runs if they are sae corrected. From the looks of the few dynopack dyno numbers I have seen, something is a good bit different from what a car/truck would dyno on a mustang or dynojet dyno. I do all my runs on a dynojet myself. From louisianna to ga with the numbers corrected there is a minimal difference 2-3 hp. The sae correction factors in the weather and compensates, regardless of how hot or cold it is.

 

Ricks dynapac was recently recalibrated to fall between the mustang and dynjet. Its cool that I can compare numbers apples to apples now, but what sucks is that since my last was tune was on the old computer I have no way of knowing exactly how much I gained from the cam swap. For example on the old dyno's computer it made 298/30? . and now with the new comp. I made 294/298 with the cam.

 

what he is saying is that the shop temp was in the 80's ( if im correct) and yesterday it was in the 103+ temps which in turn is gonna jack up your iat's/performance

i know my car/truck doesnt run that well in the heat compared to the cool air

so what okie is wondering does the temps iat's and outside temp really affect the performance that much.

ohhh by the way was nice meeting you frank.. i say stuff a bigger cam and find a plastic CAI.

but like i said yesterday peak didnt really change that much but look what you gained through out the whole run was on average of 7-10 hp/tq across the board...