Rickys S/C Z28

iTrader: (13)

hay guys i see that a LOT of people are making well over 600RWHP with there d1 at 9 psi and up, im at 12 and making only 540RWHP what do you think is the problem is?
My setup is:

Engine:
forged 347 9:8:1
stock 6.0 heads( milled after i blew up motor and thats why i have 9:8:1)
DG springs
Victor Jr intake
intakelbows.com elbow
stock ported TB
EPP blower cam

Fuel:
twin intank 255
stock lines
60 lbs injectors
fast rails
pump gas no meth

Transmission/converter:
Local built 4L80E upgraded clutches new everything and transgo HD-2
Pro-Edge 3600

Rear:
built 8.8
Detroit locker
3:73 gears

Exhaust:
Pacesetter LT
Pacesetter ORY
stock I pipe
Flowmaster

Power Adder
Procharger D-1SC with 8 rib @10-12 psi
Epp front mount inter cooler
Big RED BPV

the car was went a 6.95 @ 99 in the 1/8 (3741 race weight)

I know the car runs well and the tune is spot on yet when i compare my numbers with others i seem to be a lot lower at the amount of boost im running, now i understand that dyno numbers are not the most important thing in the world but they are a good tool to gauge a set-up and looking at the numbers it seems that im off? what do you guys think?

thanks for any help

4SFEDZ

iTrader: (6)

tranny and stall are eating up some, most of those numbers you hear bout a 6 speeds. was it a mustang dyno? that would be the biggest diff!

z28boy

iTrader: (2)

How far up do you spin the motor? That 80 will soak up a little power. Mustang or dyno jet?

Rickys S/C Z28

iTrader: (13)

it was a dyno jet and we spin it to 6500

blue00ZZleeper

iTrader: (5)

Doesnt seem wrong...580 on mine on 9psi through a M6 so 40+rwhp doesnt seem that far off...like a 20-25% loss for a auto

to-fst-4u

iTrader: (35)

Drop the exhaust and re dyno. I bet that shitty pacesetter Y pipe and flowmaster are really holding the car back.

dlandsvZ28

Have you replaced the small ATI filter with a bigger filter? A bigger filter for sure makes a difference.

Stock I-pipe is 2 1/2 or 3 inches? That would seem to me to be a restriction - 3 inch into 2 1/2. There's a lot of hot air coming out of a blown motor - that might be the bottleneck.

Which pulley? For me going from a 4.5 to 4.38 pulley and SD tune increased rwhp nearly 80 hp up to 565 rwhp on a Mustantg Dyno (A4 - 12 bolt Moser). We could have got more - but I still have stock bottom end.

http://www.flickr.com/photos/1835930...7602956888623/

DeltaT

iTrader: (5)

Are you locking up the converter above ~40mph? That will lower the amount of power the 80E sucks up too.

But I'm in agreement with the guys above - you need a beefier exhaust setup. The filter is a good tip, too.

Jim

Rickys S/C Z28

iTrader: (13)

you think that would hold me back 50+WHP?
i did not use the filter for the dyno and im running a 3.7 h/u and a 7.25 crank sd tune
yeah locked it up and making pulls from about 40
so is my exhaust holding me back that much? i would have never thought it would make that big of a difference

Dewey

iTrader: (1)

if you're lifting weights and you can't breathe then i'd imagine you'd lose a little strength yourself...

98Z28CobraKiller

iTrader: (17)

At that power level you should be running a 3" y into a 4" single or true dual 3". The pacesetter Y dead heads the drivers side into the passenger side straight pipe that runs to the back, correct? You could also try cutouts about a foot back of the collectors in your existing exhaust.

I wouldn't doubt that this is killing you right now. I picked up 30 rwhp going from the Jethot Y-pipe (2 1/2 into 3"), which I believe is the same, to true dual 3" on my old LS2 408.

Here's the true duals with Borla XR1's:


Was looking for pics of the shitty Y which looks more like a T but I cant find any.

4SFEDZ

iTrader: (6)

holy crap didnt even notice! heck ya put a cut out on it, my buddy picked up like 60hp and the wheels! it was a little higher hp than you but i bet u will pick up a solid 40+. and use as big of a filter as you can fit in there!

dlandsvZ28

I tucked up my piping to make a better location for the air filter for air and easy removal for cleaning. This K & N (KN E-1009) is one size smaller than the size Bob at EPP sells. It flows around 825 cfm. The bigger filter will fit if you trim the bumper brace support and route this way.

http://www.flickr.com/photos/1835930...7602956888623/

http://www.flickr.com/photos/1835930...7602956888623/

With the custom aluminum piping tucked up an additional two inches the original plastic shields bolts back on to the underside of the front bumper protecting the filter from rain but I don't drive in rain anyway.

kikass_z28

I know somebody putting down 548rwhp at 12psi on a stock 346 with just a ls6 intake, long tubes, and a flowmaster catback. I would think having the epp blower cam and vic jr your peak numbers would be a lot higher.

Rickys S/C Z28

iTrader: (13)

Thanks man i think im going to try the TD and see what happens ill post up when i do thanks man
i have the big EPP filter but i cant use it because of were my BPV is, i guess i could move it but that would be a lot of work?
yeah i wish i could do that, but my BPV is in the way
Yeah me to

98Z28CobraKiller

iTrader: (17)

It's For Sale for $200+ shipping.

PM me if you're interested.

DeltaT

iTrader: (5)

That's a good price but you might consider going to a mandrel bent setup - those crush-bend pipes are also more restrictive than optimal. Since your engine is just an air pump, and a blown engine pumps more air, you really need to get rid of it through an optimized exhaust, so every little bit helps more than you might think.

Jim

Rickys S/C Z28

iTrader: (13)

thanks man but i will just make one up here, thank you any way

4SFEDZ

iTrader: (6)

dude, if you like the way it sounds now, i would just put a cutout on it! cruise with it how it is now then open her up! id be the cheapest, best route imho!

Rickys S/C Z28

iTrader: (13)

yeah man i think you might be right and i have a cut out so i think im going to try that