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Old 02-23-2011, 01:01 PM   #1
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Dyno jet results with new trick flow heads!

My mustang made 290RWHP and 306TQ on a dyno jet. I was expecting to be at least 315-330 any ideas what's holding me back. I have trick flow 170cc track heat heads w 1.7 Rr, b cam, unported weiand stealth intake, holley 650 dp. The heads were milled to a 58cc combustion chamber and the timing was set to trick flows specifications, the carburetor jets were changed to 70/71 and the A/F was perfect throughout all rpm. The dyno chart show peak hp at 5800 then it starts dropping off! Could it be that I need a victor jr intake, bigger carb (670 demon), or maybe just a carb spacer on my weiand intake. Am I expecting too much from a b cam? Although I have seen a few guys running a b cam make 315-330 RWHP. I plan on adding underdrive pullies soon. At this point I just wanna break 300RWHP. Can anyone tell me what could possibly be holding me back? Also could it be that I need to port match my weiand intake!

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Old 02-23-2011, 01:10 PM   #2
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Re: Dyno jet results with new trick flow heads!

well it could just be the dyno, they are all different and are really only a tool to test out the setup to make sure its running good, the calibration and load/no load etc etc all factor into what the final numbers are.

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Old 02-23-2011, 02:17 PM   #3
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Re: Dyno jet results with new trick flow heads!

i wont go as far to say you b-cam is bad. but it's making power where ford designed it. alot of us pushrod guys refer to a b-cam as an r.v. (recreational vehicle) cam. for lower rpm torque and hp. going with a higher lift cam isnt gonna necessaily gaurentee you more h.p. (maybe a lil), but mostly likely move your peak hp level a bit higher in the rpm range.

like spactor said, it could be the dyno. 5 different dyno facilties could yield you 5 different dyno results. but also know, that most of the aftermarket companies quote their h/c/i packages h.p. rating from the crank, not rwhp. and no one engine is alike, which means they all react slightly different to mods. you can have to identical motors and they put out slightly differnt h.p.

perhaps your issue is in carb size.....
sprint cars and nascar trucks use the identical engines. a cup car has approx 850hp... and a truck has approx. 650hp. the only real difference between the two powerplants is carb size.

im not a carb motor expert. im sorry i cant be more helpful.

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Old 02-23-2011, 02:41 PM   #4
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Re: Dyno jet results with new trick flow heads!

290HP's not bad for a 5.0 !!!
i put an engine in a kids car he bought from coast high perf / 347 stroker ,TFS everything ,supposed to be 440 hp, spared no expense !! had it dyno tuned ,only made 296 ? so you never know ..............
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Old 02-25-2011, 12:14 AM   #5
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Re: Dyno jet results with new trick flow heads!

yeah, the numbers mean absolutely nothing! take it to the track those are the only performance numbers that matter.

you can get caught up racing the dyno, you make more power but your really only applying more dyno brake, when tuning on a dyno you should be looking at acceleration time and not power. almost always will a car run faster at the track making less power than it could be tuned for.

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