'99 4.8 vs '94 5.7
11-04-2006, 10:33 PM
#1
'99 4.8 vs '94 5.7 well guys, this happened awhile back but i was just needing some answers. there is a guy in town with a '99 single cab stepside chevy silverado with a 4.8 liter. his mods are ram air hood, cold air intake, true dual 40 series flowmasters with no cat, hypertech power programmer, and 3.73 gear. i have a '94 chevy silverado ext. cab stepside with a 5.7 350, not vortech, jsut regular 350, and my mods are Jet TBI spacer, one 40 series flowmaster with no cat, and an ADS Superchip. well i have seen him around revving it up so one night we finally meet each other and decide to go to a bridge outside city limits where everybody races. its marked off exactly a quarter of a mile. so we get out there and we start from a dead stop. we hit the horns 3 times and go. i pull out in front and was about a car length ahead until about 35 mph, after that it was nasty..he beat me at least 8 lengths..can anybody tell me what happened?? i mean i thought i would beat him but are the 4.8's really that fast?
11-04-2006, 10:48 PM
#2
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Well if you were both stock you would have about 210bhp(in good running condition) and he would have 255. So he has more power, better gears, and a possibly better condition motor. I am not sure on the weight differences but if he was reg. cab and shortbox it would be the lightest of the 99-06 silverados.
You were definately outmatched but a race is a race!
Dan
You were definately outmatched but a race is a race!
Dan
11-05-2006, 11:21 AM
#4
haha..well i dont think he has nitrous but he wont ever pop his hood for anybody..but if anything i would think he had a supercharger because it always make a whistling sound..but idk..oh yeah and he has a new throttle body with more cfm and a tbi spacer lol ..but do you think i would be able to catch up or make up those 8 lengths with my 100 shot of nitrous im installing this week? i have a cam,vette servo, and NOS im bout to add..would i be able to get him then?
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11-05-2006, 03:09 PM
#8
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Originally Posted by gyrene2003
why does the 4.8 have higher hp numbers than the 5.7?
Displacement is only one of many factors that produce hp/tq...it's definately not the deciding factor.
11-05-2006, 07:59 PM
#9
TECH Apprentice
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Our 1995 plow truck at work has a 5.7 in it. It's a 3/4 ton with 4.10 gears. If I didn't know any better I would say it's a little 2.2 under the hood. I can't get over how slow the thing is. And to think GM expected people to pull trailers with that truck. i seriously can't line lock it at all. Won't. The 4.8 doesn't have the low end the 5.7's did, but as everyother Gen III+ V8, the power doesn't come on till higher rpms
11-05-2006, 08:12 PM
#10
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Originally Posted by JimsWS6
Our 1995 plow truck at work has a 5.7 in it. It's a 3/4 ton with 4.10 gears. If I didn't know any better I would say it's a little 2.2 under the hood. I can't get over how slow the thing is. And to think GM expected people to pull trailers with that truck.
As for the death, I think the newer truck has the edge on power and powerband, but for 8 lengths, he's got more done than he's saying.
11-05-2006, 08:26 PM
#11
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The 1989-1995 TBI engines were very underpowered, I had a 1991 and it was a great truck but nowhere anything designed for racing. The 4.8 is smaller cubic inches, but is a more efficient engine design. It is based on the LS motors. Stock for Stock a 4.8 will destroy the 5.7. Now a modded 4.8 vs a lightly modded 5.7 that is a slaughter.
11-06-2006, 04:13 PM
#12
well thanks guys yall make me feel better lol..i thought he was lying..he slipped and told some people wat he had the other night tho..he has these specs:
1. aftermarket cam
2. new bigger tbi
3. tbi spacer
4. cold air intake
5. ram air hood
6. 3.73 gears
7. power programmer III
8. true dual flowmaster 40 series with no cat
and he also had it lowered 2 inches..
so do you guys think i can beat him with my 100 shot of nitrous , .454/.480 lift cam, and a vette servo?? please answer yes or no truthfully..because imma call him out and race him if yall think i can win..
1. aftermarket cam
2. new bigger tbi
3. tbi spacer
4. cold air intake
5. ram air hood
6. 3.73 gears
7. power programmer III
8. true dual flowmaster 40 series with no cat
and he also had it lowered 2 inches..
so do you guys think i can beat him with my 100 shot of nitrous , .454/.480 lift cam, and a vette servo?? please answer yes or no truthfully..because imma call him out and race him if yall think i can win..
11-06-2006, 06:29 PM
#13
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well I dont know much about either trucks when it comes to racing, but by benchracing standards that 100 shot should make up about a second in the 1/4, or 10 carlengths. So all that stuff should give you an edge, if he doesnt change anything. Just race him......if you win, great, if not, mod more.
