4.8 vs 6.0 hp difference
#22
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is the 4.8 your using a gen 3 or 4?
#23
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We just finished a buddy's car in January with a 4.8. Similar to what your asking about. It's got a 228/230 112 cam arp studs and ls9 gaskets with a cast s480 1.10/83 t6 with a 2 1/4 Hotside. It made like 680 or 690 on 18lbs through a th400 and 9in. He had a gt45 on it b4 and the s480 spools a little slower but not much.
#25
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The cam I already have, the 4.8 I have, the 1.32 ar s475 I have on the way already. Friday after my 3rd pass I melted a piston and my choices if fixing are a set of 8:1 dished wiseco pistons for the 6.0 that I already have or a 4.8 that I already have. Im running pump gas and meth will be added when running again. Almost feel it will spool the same no matter what way I go.
#28
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My setup so far is 02 4.8 with 243 heads 227/231 623/598 114+5 LSA and a S475 T6/96mm 1.32 backside!
Again this is what I already have, worse comes to worse i'll spray the damn thing!
Again this is what I already have, worse comes to worse i'll spray the damn thing!
#31
TECH Senior Member
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With a 4.8 and a PT7675/Turbonetics 7675 or 7875 (I highly recommend these over the TC series and if you can swing the PT7675 with a .81 AR housing for the 6 speed you'd be IN BUSINESS), Vic jr. on 91 octane this is the camshaft profile I'd recommend if the car was full weight with a 3.23-3.55 rear gear:
278/286@.006"
226/231@.050"
147/149@.200"
113LSA 107ICL 119ECL
226/231 .605"/.598" 113+6
278/286@.006"
226/231@.050"
147/149@.200"
113LSA 107ICL 119ECL
226/231 .605"/.598" 113+6
#37
#38
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Compressor choke. It is determined by the isentropic efficiency of the compressor dropping low enough that it cannot flow any more air. Increased heat output lowers air density so power making capability reaches an asymptote, or choke point. A turbo will almost always make more power on a smaller displacement engine.