Mostly Stock Internal 4.8 Breaks 500rwhp
12-18-2007, 12:44 AM
#14
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nice! not bad at all. Im sure if i could tune my **** myself i could squeeze quite a bit more out of mine, but im happy with my mail order tune for a while.
12-20-2007, 09:33 AM
#15
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Looks good.It will make a better dyno graph-more power if you find out what made the dip and wavy graph.Looks like your slowly eating the tranny or converter.If it smooths out I bet you'll be at 540rwhp.
Last edited by BlownChevy; 12-24-2007 at 12:36 AM.
12-20-2007, 12:37 PM
#16
. It was getting late and there was still a couple of guys left to go. I think the dips are from some random misfires, as the plugs are about 2 years old now and some guys said there was a couple quick puffs out the exhaust, that looked like a misfire. I think the trans and converter are holding good, looked at the RPM/MPH graph and there was only a .5 MPH difference from the beginning to the end of the run and it was smooth. The dip right after the boost peeked was from a 4* timing pull that came from some where, as it wasn't KR according to the log.
I know its got some more in it. One of these days, I might schedule a hour or two on the dyno and do some fine tuning
The motor doesn't scare me, but the tranny does, 
12-24-2007, 03:55 PM
#20
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The 4.8 motors can take alot of abuse.
I made 525rwhp and 589rwtq with a stock 4.8 short block,stock ls6 heads and a 224 230 cam.
I sprayed a 225 wet on it and abused the **** out of it for 6 months.It finally broke the ring land on two pistons after over reving it to 7800.
I made 525rwhp and 589rwtq with a stock 4.8 short block,stock ls6 heads and a 224 230 cam.
I sprayed a 225 wet on it and abused the **** out of it for 6 months.It finally broke the ring land on two pistons after over reving it to 7800.