0utLawZ28

iTrader: (1)

ss came with 325 headers would add about 15 - 20 exhaust 10 - 15 asp 5 - 10 intake filter and below would add about 5 - 10

so that 45 - 55 hp on top of the 325 so he could have 365

Sunset'01Z

iTrader: (10)

you cant say 325 stock, because these cars made about 350 flywheel hp stock, avg about 300 to the wheels. his 365 is to the wheels, is more like 420 flywheel.

given the benifit of the doubt, lets say his car made 310rwhp stock, he has a built trans and a high stall torque converter which take away from some of that hp. so his boltons and tune have added 60rwhp? maybe but not likely. most full bolt on auto cars see 340's, some see 350's but that's considered a strong car.

0utLawZ28

iTrader: (1)

i got a ls1 book from gm that rates the ss at 325 for 2001 but i do see how the stall and tranny would reduce hp

Sunset'01Z

iTrader: (10)

gm underrated these cars for marketing. they didnt want the fbodys to steal the thunder from the vette.

0utLawZ28

iTrader: (1)

so that would mean they got more than 325 if they under rated them cuz my book is from gm

Sunset'01Z

iTrader: (10)

i think you are confused with flywheel horsepower and rear wheel horsepower. ratings you see in books and **** are flywheel horsepower, designated by manufacturers. we cannot accurately measure flywheel horsepower since the engine is bolted into the car, but we can measure rear wheel horsepower. the thing you need to understand about rear wheel horsepower is, the drivetrain is going to eat up hp due to rotational mass, friction, and in the case of autos, slippage in the torque converter.

if you look at post 22 i stated that these engines make about 350 flywheel horsepower in stock form, no matter what car they are in, ram air or not.

Pro52R

iTrader: (15)

Read less of that book and more LS1 Tech and you'll be amazed @ what you will learn


an LS1 is an LS1 is an LS1.....They are all the same from the formula to the c5 (non z06)

Few differences but not anything like leaps and bounds to make 20hp+


I love when people see SS or WS6 and think the car is seconds faster due to badges

0utLawZ28

iTrader: (1)

im not saying that they got 20 hp more i have a near stock 2000 t/a none ws6 that will spank a ws6 or ss all day long im just saying that are cars dont come with 300 hp they come with about 315 - 320 hp and theres really no dif between 2000 and 2001 + cuz even now they got the ls6 intake they got a smaller cam
i know about these cars

but 97-98 might have 300 hp cuz they were a bit shity lol bad oiling head problems among
few other problems

as i said above i didnt think about it being an auto with a hi stall id say he might be pushing 350 with a good tune

and there no way are cars have even 310 at flywheel that would put us with less hp than a mustang and they put down 285 to wheels and i know in a 4l60e it takes about 20% of power and rear end takes about 10% and a 4l80e takes almost 35% but the t56 only robs about 15 % of the power made by the car

SOM02WS6

A below is not going to give you 5-10 and the paper filter has been shown to make just as much hp as a KN or other oiled filter...And 97 and 98 assuming you are talking F bodies are two different engines......

ApexVIII

iTrader: (17)

when i Ported my TB it made my throttle response feel alot better

TLUZLS1

iTrader: (6)

It's all about the real world bud. Your addition of hp from the aftermarket is pretty accurate but the 325 starting point is off. I have never seen or heard of a stalled/bolt-on ls1 make that kind of power. On average, an ls1 will put down anywhere from 290-310 at the wheels, tested and proven over and over. Sunset01Z is right. You would be surprised at some of the things you can learn from this site. Put down that GM book for a little bit and do a some digging on here, trust me, you'll be happy you did

To the OP:
Yes I think you should port and polish your TB, I noticed a little bit of difference (mainly part-throttle response). It's definitely worth it if you do it yourself ( it's free!!), plus I thought it was kinda fun.

0utLawZ28

iTrader: (1)

first off i never said a below would give 5 - 10 hp i said filter / intake / and below together would 5 - 10 and first off there was never a 97 f body that had a ls1 in it only corvette's got them in that year and no its not a different motor they just redesigned it in 99 the only difference is the oiling and the heades

Pro52R

iTrader: (15)

they all have the same hp...ss or not...ok maybe the cat-back will give you 5hp.....

GM rates it @ 305hp....but in reality these cars make 345-355 hp stock (flywheel)

I am also goin to agree w/ the others. 375rwhp is high for just bolt ons...unless the dyno was off that day

0utLawZ28

iTrader: (1)

that y i i said maybe 350 with a good tune

crapyboy750

I have proof of the horsepower and torque. i have the dyno print out sheets.

blk97z28

iTrader: (3)

Mustangs don't dyno 285 I know a 2002 GT that does stock about 245ish.

blk97z28

iTrader: (3)

97 z28's did 285 flywheel horsepower I did 245.5 RWHP stock. After headers I did 26 RWHP and my torque went from 270 to 293.2. 93-97 have the LT1 engine cast iron block and aluminum heads, then in 98 the LS1 engine was introduced in the f-bodies and those engine have aluminum block and aluminum heads. The LT1 engine is actually bigger than the LS1. The lt1 measures in at 350 cubic inches and the LS1's measure in at I believe 346.6 cubic inches but GM rounds that number up to 350 cubic inches. I was told that the difference in horsepower is all in the heads, the LT1 heads are not the best. Devin

Zcleanest28

+1 for underrating the stock ls1. Broncos list of books is a sticky on newb tech if you want some good non internet reading. I don't know if it is on the list, but Chevy LS1/LS6 Performance by HPBOOKS is some pretty basic stuff, but it will give good insight to bolt-ons up through forced induction. It's a couple years old but it gives lots of information regarding changes through the years of Ls1 cars.

0utLawZ28

iTrader: (1)

zcleanest28: that's 1 off the book i got

blk97z28: 245 damn that shitty lol i forgot the cobra have 285 becuase of there roots type blower

most of the power does come from the head but also with redesigned block with the push rod and lifter seting under the head instead of under valley cover this allowed the valves to be at less of a angle and the rockers and port no longer had to be offset

they have a new firing order that lowered vibration

stroke was increased from a 5.7 rod to a 6.125 rod wit a 3.xx stoke on the crank

they used hypertecic coating on the pistons

has a reverse flow coolant system that allowed for higher compression with out detonation then 2001 they change the block and heads (ls6) with jumped the hp up to 405 and the f body got the intake and some very few got the ls6 block etc....

blk97z28

iTrader: (3)

OutlawZ I was right for the most part!