UPDATE PAGE 6 !!! 402/afr/fast 102 combo Nitrous results = 8xx/8xx
08-18-2011, 06:17 PM
#21
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08-19-2011, 03:45 AM
#29
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08-19-2011, 09:00 AM
#31
I have been to two mustang dynos with a cam change and it was 60hp different. No way a cam change was 60hp lower on one dyno. I have been to two different jets they were 30hp different with no changes. I would not put alot in to dyno numbers.
Last edited by mike c.; 08-19-2011 at 05:56 PM.
08-19-2011, 05:07 PM
#32
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The reason I don't is simple. A 25% underdrive pulley is barely adequate to dampen harmonics in a stock 3.622" stroke engine. Anytime you increase the stroke of the crankshaft, you will increase relative piston speed and shock loads the crank, rods, and pistons will see. The larger diameter balancers have more mass and area to dissipate the harmonics generated.
Since an underdrive pulley is worth a fixed amount of "freed" horsepower no matter how much power the engine makes, on bigger builds the percentage or relative gains become neglegable in comparison to the loss of durability. It takes a fixed amount of power to turn a water pump, alt, PS pump, etc...
I have seen firsthand the damage that can occur inside an engine with a damaged or inadequate balancer. Is that 7 HP really worth your $2500+ rotating assembly?
I would rather install a new STOCK damper on a built engine than a 25% underdrive pulley. On engines I build here and stand behind, I REQUIRE an ATI SuperDamper.
Shane
08-19-2011, 09:10 PM
#34
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I agree, I'll find the cam card this weekend when I get some time. Like I said those numbers aren't exact I'm going by memory I haven't seen the cam card in several months. I'm thinking it's on the smaller side of my guess
08-19-2011, 09:48 PM
#35
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What are you guys thoughts on a motor making less power when it's new? Is it a myth or will it pick up power with more miles? It's at about 250 right now but it's had alot of idling and short distance heat cycles
08-19-2011, 11:02 PM
#38
Hmmm, I guess my cam is too big too. But yet I make 521rwhp through a 4L80E, truck 12 bolt with 4.56 gears and a 315/60/15 drag radial. BTW, my cam is a 245/260 .646/.629..
I am running a 11.14-1 cr 416ci motor with AFR 225's.. But I am running a Super Vic with dominator TB on top of a NX plate and a 4500/4150 adapter.
You can't tell me the slight bump in CI is the determining factor even though it helps a little. But I could argue his compression helps him a little, not to mention the manual trans set up.
Sorry I am not much help on figuring out your problem, but to say the cam is too big, well I don't know that it is.. I mean, I am not a cam grinder, but do question why my bigger cam works.
08-19-2011, 11:10 PM
#39
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I have faith in Geoff at eps, I think the cam is fine, it's something else.. I may have figured it out. I was looking things over today and noticed my throttle cable seems to be stretched a lil bit from my old nitrous plate setup. It seems like the cable has a ton of slack, so much that it pops off while driving it. So maybe it's only opening 70-80%. Just a thought for now.