why is my power so low?
Thread Starter
10 Second Club
iTrader: (13)
Joined: Feb 2006
Posts: 3,297
Likes: 0
From: MOREHEAD KY
why is my power so low? 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
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
TECH Fanatic
Joined: Jun 2003
Posts: 1,869
Likes: 99
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/
Last edited by dlandsvZ28; Jul 31, 2009 at 11:33 PM.
Trending Topics
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
But I'm in agreement with the guys above - you need a beefier exhaust setup. The filter is a good tip, too.
Jim
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
10 Second Club
iTrader: (13)
Joined: Feb 2006
Posts: 3,297
Likes: 0
From: MOREHEAD KY
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/
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/
so is my exhaust holding me back that much? i would have never thought it would make that big of a difference
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
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
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.
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!
TECH Fanatic
Joined: Jun 2003
Posts: 1,869
Likes: 99
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.
Last edited by dlandsvZ28; Aug 1, 2009 at 10:47 AM.
On The Tree
Joined: Dec 2008
Posts: 109
Likes: 0
From: Lino Lakes, MN
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.
Thread Starter
10 Second Club
iTrader: (13)
Joined: Feb 2006
Posts: 3,297
Likes: 0
From: MOREHEAD KY
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.
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.
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.
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.
Yeah me to
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
Jim
Thread Starter
10 Second Club
iTrader: (13)
Joined: Feb 2006
Posts: 3,297
Likes: 0
From: MOREHEAD KY