Vortech s/c 5.4 2v dyno results

[amoosenamedhank]

I'm just copying this from another forum but I hear a lot of guys asking 5.4 questions on here so I thought I post this up.

Well after 2 years of working on this damn car I finally got this thing on the dyno. The quick list for mods are a stock 5.4 with SHM 2730 cam (not impressed with) Vortech with FMIC, and custom lightning intake.

I'm actually really happy with the numbers, I'm only pulling this thing to 5,500rpms because of the stock rods. But no more stalling the numbers were 390/391 at 5,500rpms at only 6lbs of boost! I'm very pleased with the difference of the 5.4. I'm actually probably down on torque because of my short runner intake but I'm still making 320lbs of torque at 3,000rpms. It has a very nice, very broad torque curve not which I'm very happy with.

I will have the dyno sheet up on Monday and I will go through the footage I have to see if anything is worth putting up. They don't let you stand in the same room as the car anymore while it's on the dyno so I'm not sure any of the footage will be worth a damn.

Next on the list, forged rods and pistons and a smaller pulley!

 

[Willis_98GT]

very nice for only six pounds, man i couldn't imagine a built bottom end and 12lbs :boink:

 

[justinschmidt1]

Very bad ass...too bad you didnt forge the thing

I thought a short runner intake would give more low end power and torque?\

Long intake would breathe better at higher rpms and have more top end power?

Anyways, nice build...bet that thing moves

 

[phil_the_thrill]

Very bad ass...too bad you didnt forge the thing

I thought a short runner intake would give more low end power and torque?\

Long intake would breathe better at higher rpms and have more top end power?

Anyways, nice build...bet that thing moves

I thought the same thing as you until I was corrected by the head of the engine team from GM on career day. He said longer runners equals denser charge equals more low end torque.

 

[330CubeGt]

Nice to know for future reference.I was looking to get300-350 N/a and 400-450 on 8lbs.to the tires on a stock 5.4 bottom end in my car. at least for a little while why i build a more reliable bottom end.

 

[amoosenamedhank]

Very bad ass...too bad you didnt forge the thing

I thought a short runner intake would give more low end power and torque?\

Long intake would breathe better at higher rpms and have more top end power?

Anyways, nice build...bet that thing moves

I thought the same thing as you until I was corrected by the head of the engine team from GM on career day. He said longer runners equals denser charge equals more low end torque.

You are correct, the short runner intake prefers a higher revving set up while the long runner is more for low end. It is also a single plane intake while a dual plane would be better.

The best part of about my intake manifold set up is the cost. I have about $260 into the entire thing. Opposed to doing the adapter plates which are $300 by themselves. Plus then I would probably be out buying a trick flow intake manifold or something.

Oh and like I said before, don't worry rods and pistons are on their way!

 

[GaryG]

thats nice numbers for only 6#'s