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Unread 05-19-2003   #1 (permalink)
ZORLAC69 is offline Rookie


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Cool 4.6 Liter Horsepower

I just bought a 1998 GT, I've always owned Chevrolet's, because they're cheap to modify and build horsepower. What can be done
for Cheap Mods on the 4.6 Gt? I love my new car, but am very
suprised that it only has 215hp and under 300ft/lbs or torque, when
you can buy a TrailBlazer with a Straight 6 that puts out 275hp
and well over 300ft/lbs of torque.
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Unread 05-19-2003   #2 (permalink)
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For cheap bolt-ons you could do gears, pullies, timing adjuster, exhaust etc.

There is also a head swap kit for your car Ford changed heads in 1999 260hp.
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Unread 05-19-2003   #3 (permalink)
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although we dontmake much hp i've still beaten many 5.0L mustangs, many a honda's and stayed damn close to z28's and others of the sportscar world. i'm happy for the $ i put into the car.
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Unread 05-19-2003   #4 (permalink)
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The above is pretty much it. There is a new intake mod. It was in either this months MM&FF or 5.0 magazine. They polish the upper intake and it nets you about 10 HP.
A filter charger helps also.

MK
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Unread 05-20-2003   #5 (permalink)
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Default Re: 4.6 Liter Horsepower

Quote:
Originally posted by ZORLAC69
I just bought a 1998 GT, I've always owned Chevrolet's, because they're cheap to modify and build horsepower. What can be done
for Cheap Mods on the 4.6 Gt? I love my new car, but am very
suprised that it only has 215hp and under 300ft/lbs or torque, when
you can buy a TrailBlazer with a Straight 6 that puts out 275hp
and well over 300ft/lbs of torque.
a trailblazer would get spanked by a 98 gt. With a stage 1 turbo kit seen in MM&FF you can run over 430hp and over 530 pounds of torque on pump gas. 8psi...
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Unread 05-20-2003   #6 (permalink)
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oh and its 225hp
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Unread 05-20-2003   #7 (permalink)
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Porting the 98 manifold??? Gears, O/R H pipe, drag radials, good CAI...that will get you into the mid to low 14's with no problem. There are also pullies and timing adjusters, that can get you a little more. The heads are the restriction on our cars. But they respond well to forced induction, which isnt cheap, but easy to do. There is the headswap option as noted above, and there are also FRPP racing heads and manifold that are available, but expensive.

Hey Luke you had any probs with your Xenon lights? How you like em?
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Unread 05-20-2003   #8 (permalink)
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Thumbs up HP

Don't forget that swapping in the PI cams is cheap and easy HP.:green :green :green
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Unread 05-20-2003   #9 (permalink)
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you mean heads?
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Unread 05-20-2003   #10 (permalink)
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Default Re: 4.6 Liter Horsepower

Quote:
Originally posted by ZORLAC69
I just bought a 1998 GT, I've always owned Chevrolet's, because they're cheap to modify and build horsepower. What can be done
for Cheap Mods on the 4.6 Gt? I love my new car, but am very
suprised that it only has 215hp and under 300ft/lbs or torque, when
you can buy a TrailBlazer with a Straight 6 that puts out 275hp
and well over 300ft/lbs of torque.
Ok, the trailblazer did not have 275 hp from a straight 6 in 98 the s10 blazer had 190HP in 98 and the trailblazer wasn't offered. Compare the GT with other vehicles in the same years. The Z28 had 305HP from a 5.7L V8 and was heavier than the GT by over 200 lbs. The 2002 Trailblazer also has 270Hp and 275 ft lbs torque and weighs 4442 lbs.
Torque for the 98 GT is 290 Ft lbs and 225 HP from a 281 Cu In motor.
the 5.7 350 had 335 ft lbs torque. I think you would enjoy the GT much better than the trailblazer. More heads will turn.
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Unread 05-21-2003   #11 (permalink)
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Question HP

No I ment a cam swap. The PI cams have a lot more lift. About 15 rwhp on the cam swap. Takes less than a day and doesn't cost much.
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Unread 05-21-2003   #12 (permalink)
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The headswap is a more efficiant swap..most of the power that the 99+ engines have over the older 4.6 engines is because of the rectangular ports and improved combustion chamber design.

4.6 Cylinder Head Flow Data

Lift STock Ported
'96 '01 '96 '01
.100 46 54 61 60
.150 66.6 78 89 86
.200 84.5 98 111.5 116
.250 103.5 119 131.3 141
.300 121.3 135 146 160
.350 134.7 145 159.6 169
.400 147 156 173.3 176
.450 159.4 161 185 182
.500 170 166 188 185
.550 176 168 192.5 186



With a good set of ported heads, you could see some big horsepower gains.. I remember seeing a set of brand new ported PI heads with everything for 1300. I hope thise informatino helps.. took me forever to type up.

~luke
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Unread 05-21-2003   #13 (permalink)
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Quote:
Originally posted by 1998GT
The headswap is a more efficiant swap..most of the power that the 99+ engines have over the older 4.6 engines is because of the rectangular ports and improved combustion chamber design.

4.6 Cylinder Head Flow Data

Lift STock Ported
'96 '01 '96 '01
.100 46 54 / 61 60
.150 66.6 78 / 89 86
.200 84.5 98 / 111.5 116
.250 103.5 119 / 131.3 141
.300 121.3 135 / 146 160
.350 134.7 145 / 159.6 169
.400 147 156 / 173.3 176
.450 159.4 161 / 185 182
.500 170 166 / 188 185
.550 176 168 / 192.5 186



With a good set of ported heads, you could see some big horsepower gains.. I remember seeing a set of brand new ported PI heads with everything for 1300. I hope thise informatino helps.. took me forever to type up.

~luke
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Unread 05-21-2003   #14 (permalink)
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Thanks for all the tips, to all. After getting all the information
on Tweeking my new (to me) 1998 Gt, I finally got to pick it
up last night and drive it. You guys will think Im a retard, but
I never drove it before I bought it, Infact the last Gt I drove
was my friends 96 5.0, I believe. Anyway it was the same
body as the 98, but with a 5.0.
The car was so Mint, I new it was well taken care of.
Im not disappointed at all, in fact the 225Hp the car makes
is well tuned with the Ring/Pinion and Tranny. The car is as
tite as can be, and the over all ride blows my 86 Corvette
away. This car is 100% bone stock and I am truely impressed
with this car.

Thanks for all your Responses,
Steve S
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Unread 05-21-2003   #15 (permalink)
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96 was a 4.6 liter too except it was 10 hp less.
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