Mostly Stock Internal 4.8 Breaks 500rwhp
Dec 16, 2007 | 03:35 PM
#1
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From: Oakland, OR
Mostly Stock Internal 4.8 Breaks 500rwhp
So I hit the rollers yesterday with Thunder550's GTO dyno day buddies. The "little" 4.8 managed to pull off 505 wrhp and 533rwtq with 11psi of boost. Was pretty happy to break the 500 marks. 
Probable had a little more in it, as I was running 16* of timing and had no KR, a couple more degrees could have gotten me about 20 more hp I think. I'm also maxing my 42lbs/hr injectors at 108% duty cycle at 6200rpm.
EDIT: Here's the vid
http://video.performancetrucks.net/v...060167c01a.htm
Probable had a little more in it, as I was running 16* of timing and had no KR, a couple more degrees could have gotten me about 20 more hp I think. I'm also maxing my 42lbs/hr injectors at 108% duty cycle at 6200rpm.EDIT: Here's the vid
http://video.performancetrucks.net/v...060167c01a.htm
Last edited by kbracing96; Dec 16, 2007 at 09:01 PM.
Dec 16, 2007 | 04:30 PM
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Originally Posted by nonnieselman
Why does it lean out at 5500?
Dec 16, 2007 | 05:40 PM
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Was waiting for you to share the good news!! Chris seems a little pissed at you!! So looking at your power curve...you and chris should run pretty close to each other until he get's into his top end! You guys should race and get it on vid!! 
Speaking of video...did you get your pull on vid like Chris did?
Speaking of video...did you get your pull on vid like Chris did?
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Dec 16, 2007 | 06:08 PM
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Was waiting for you to share the good news!! Chris seems a little pissed at you!! So looking at your power curve...you and chris should run pretty close to each other until he get's into his top end! You guys should race and get it on vid!!
Speaking of video...did you get your pull on vid like Chris did?
Speaking of video...did you get your pull on vid like Chris did?
Chris still has the vid of my truck. I was to tired last night to get it from him and he's not here right now. We raced a couple times at Speed World last April when I was down here. Was very close, lol. He was only running 8psi to my 11. He had better R/t's then me, cuz I had to make sure I had full boost for the launch (was looking more for times then racing and still sportin the STS). Time wise, I actually beat him on the first race
. He blames it on drive train lose, since he's got the 4l80 and 33's and I've got the 60 and 28's, lol.
Dec 16, 2007 | 08:51 PM
#10
Haha, ya he wasn't too happy, but we have some plans for his truck. We'll get it doing what it should Chris still has the vid of my truck. I was to tired last night to get it from him and he's not here right now.
We raced a couple times at Speed World last April when I was down here. Was very close, lol. He was only running 8psi to my 11. He had better R/t's then me, cuz I had to make sure I had full boost for the launch (was looking more for times then racing and still sportin the STS). Time wise, I actually beat him on the first race. He blames it on drive train lose, since he's got the 4l80 and 33's and I've got the 60 and 28's, lol.
Chris still has the vid of my truck. I was to tired last night to get it from him and he's not here right now. We raced a couple times at Speed World last April when I was down here. Was very close, lol. He was only running 8psi to my 11. He had better R/t's then me, cuz I had to make sure I had full boost for the launch (was looking more for times then racing and still sportin the STS). Time wise, I actually beat him on the first race
. He blames it on drive train lose, since he's got the 4l80 and 33's and I've got the 60 and 28's, lol.
