Sport Side

iTrader: (6)

I'd have to disagree, putting me "not with stupid"

marc_w

Forget THEM!!!

Those are such odd-ball cams. What exactly are they designed for?

Jorday

Yeah, I would probably choose something else if it were me.

therock

iTrader: (2)

I have a mildly modded 03 truck to say the least, with only a Nelson 93 tune, a K&N and an SS exhaust. I ponder my next and final step to be a set of TOG long tubes (If they make them in long).
Do any of you experianced folks believe the numbers there?
Would it be so with the SS exhaust? According to Corsa it flows 160 CFM more than the OE? I had my Y-pipe removed after the cats & o2's and have true duals going into the SS muffler.
What kind of mufflers if any was ran on the Dyno in the test?
These headers cost large dollars. I don't want to spend the cash for a small gain.

tdrumm

iTrader: (18)

I re-read the dyno charts and the 50 lb-ft loss was with the GT1-1 cam. I don't think anyone in their right mind would ever consider that cam for their 5.3 based on the durations alone.

But the GT2-3 doesn't look so bad. It gives up 18 lb-ft max compared to stock, and has it all back by 2600 rpm. I'm not saying this is the best cam ever, but with 3000 stall it seems like it would be OK.

As for vaccum, the GT2-3 idled at 800 rpm with 20 inches of vaccum.
Forget the GT1-1, it idled at 900 rpm and had 10 inches of vaccum.

Looks like the engine was tested without an A/C compressor, but with an alternator and power steering pump.

Sport Side

iTrader: (6)

Those duration splits are damn straight ugly.

Jorday

Anyone catch part 2 of the little bro buildup? I just got it in the mail yesterday. They added a set of LPE cnc ported cyl heads with 10:1 compression, 2.000/1.55 valves. Peak hp jumped from 413 to 437 at 6600 rpm, and peak torque went from 369 to 384 at 4800 rpm.

Then, they added the FAST LSX intake manifold with the stock TB, and converted to an F-body accessory drive so the intake/tb would fit. Peak hp then jumped from 437 to 458 at 6600 rpm. Peak torque went from 384 to 392, but the peak torque rpm jumped from 4800 to 5800. The ported heads/LSX intake/f-body accessory drive added 10 ft/lb or more at almost every data point from 2000 rpm all the way to 6800. At 5800 rpm, the heads/LSX/f-body accessory drive was worth 44 ft/lbs. They did say they thought the f-body accessory drive was worth around 6 hp.

Sport Side

iTrader: (6)

Great post Jorday! I was interested in reading the next article. Glad you posted.

This is interesting. They went with a 2 in valve on a 5.3L. Now, I'm curious to know how the bottom end power would have been effected by say a 1.94 intake valve. Maybe globs of more tq. Whats also very interesting, is how the FAST intake really helped the 5.3L. Incredible. WAM BAM! The FAST jumped peak power 1000rpm? damn

I can't wait to read it.

also. Cstraub posted this in one of the cam threads.

Hmmm, maybe a stock cammed/ported head combo with a FAST intake might kick some ***. Seeing as how the FAST/Head combo made 10rwhp at the least, from 2000-6800rpm, with the right cam choice, and valve sizes, alot more power could be made. imo

Jorday

I was also just thinking that with 458 hp on the engine dyno you would probably probably be at 400 rwhp or damn close

Sport Side

iTrader: (6)

Very true. But this is a very unrealistic test in my opinion. That cam is still damn straight ugly and killed bottom end. I hope no one ever tries that camshaft. Truly "overcammed"


BUT, those peak numbers are damn impressive by showing potential. Now I'm ready to put together a custom cam/head/intake combo 5.3