Fact or Fiction?
#24
TECH Fanatic
iTrader: (1)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
OEM HP & TQ Ratings Yes they are under rated!
OEM Cam Specs 1997 - 2003 LS1 engines + 2001 - 2003 LS6
Differences Between Years 1998 - 2002 LS1 F-Body specs
Specific 2001 & 2002 Changes
I was not able to find a link that explained the use of the LS6 Manifold in all 2001+ LS1's, but suffice it to say that since no EGR was required with the new LQ4 cam, then one manifold for both applications was primarily to ease assembly and reduce piece cost.
OEM Cam Specs 1997 - 2003 LS1 engines + 2001 - 2003 LS6
Differences Between Years 1998 - 2002 LS1 F-Body specs
Specific 2001 & 2002 Changes
LQ4 CAMSHAFT
Powertrain engineers found an elegant, cost-effective answer when the platform team asked for a five-horsepower increase in the 2001 LS1: They borrowed a billet-steel camshaft from the LQ4 Vortec 6000 truck engine. The new cam has more advance and different timing, delivering more torque lower in the rev range. Coupled with an improved air cleaner developed for the LS6 V8, the new cam increase horsepower by five in the Firebird.
EGR ELIMINATED
Application of the LQ4 cam produced a valuable side benefit: elimination of the Exhaust Gas Recirculation (EGR) system. The new cam creates more valve overlap, or periods when both intake and exhaust valves are partially open at the same time. Increased overlap allows the LS1 to meet National Low Emissions Vehicle (NLEV) certification without EGR. Removal of EGR reduces engine plumbing and potential leak sources.
Powertrain engineers found an elegant, cost-effective answer when the platform team asked for a five-horsepower increase in the 2001 LS1: They borrowed a billet-steel camshaft from the LQ4 Vortec 6000 truck engine. The new cam has more advance and different timing, delivering more torque lower in the rev range. Coupled with an improved air cleaner developed for the LS6 V8, the new cam increase horsepower by five in the Firebird.
EGR ELIMINATED
Application of the LQ4 cam produced a valuable side benefit: elimination of the Exhaust Gas Recirculation (EGR) system. The new cam creates more valve overlap, or periods when both intake and exhaust valves are partially open at the same time. Increased overlap allows the LS1 to meet National Low Emissions Vehicle (NLEV) certification without EGR. Removal of EGR reduces engine plumbing and potential leak sources.
#27
TECH Enthusiast
Thread Starter
Join Date: Nov 2007
Location: Evans, Colorado
Posts: 712
Likes: 0
Received 0 Likes
on
0 Posts
![](https://ls1tech.com/forums/images/ranks/ls1tech10year.png)
![Talking](https://ls1tech.com/forums/images/icons/icon10.gif)
Well me and my dad are gonna have to line em up. we just need to get the cars out of the garage. Weather still colder than a witch's tit here in Colorado. 32 degrees is the high lately and its supposed to snow more tonight. Hes got an 02 vette and ive got my 02 T/a ws6. We both have the 3.42 gearing and 6 speed. Both totally stock (mine not for too long). Would be interesting to see. But I know I can outshift that old guy. LOL!
![The Jester](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_jest.gif)
#28
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Well me and my dad are gonna have to line em up. we just need to get the cars out of the garage. Weather still colder than a witch's tit here in Colorado. 32 degrees is the high lately and its supposed to snow more tonight. Hes got an 02 vette and ive got my 02 T/a ws6. We both have the 3.42 gearing and 6 speed. Both totally stock (mine not for too long). Would be interesting to see. But I know I can outshift that old guy. LOL! ![The Jester](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_jest.gif)
![The Jester](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_jest.gif)
![Popcorn](https://ls1tech.com/forums/images/smilies/popcorn.gif)
#31
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Total bulls*** too. 345 my ***. Maybe w/ longtubes, intake, TB and intake mani. My C5 put down 305whp and 310wtq. That was COMPLETELY stock on a wet and humid day. No way in hell it could reach 345whp, even w/ a great tune. Those are factory freaks, so don't kid yourself about numbers. Just take the advertised HP and drop 15% for manuals and about 18-20% for auto's. There's your educated guess...
#33
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Well me and my dad are gonna have to line em up. we just need to get the cars out of the garage. Weather still colder than a witch's tit here in Colorado. 32 degrees is the high lately and its supposed to snow more tonight. Hes got an 02 vette and ive got my 02 T/a ws6. We both have the 3.42 gearing and 6 speed. Both totally stock (mine not for too long). Would be interesting to see. But I know I can outshift that old guy. LOL! ![The Jester](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_jest.gif)
![The Jester](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_jest.gif)
Plus he's a few hundred lbs lighter so be ready to lose after about 75mph.
#34
Tech Resident
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Back to your original question, all LS1's are basically the same engine, but not all make the 350 HP like the C5 Corvettes. The Camaros and Trans Ams make different HP numbers than the Corvettes and GTO's running LS1's due to the different model camshafts they are running. The slightly less aggressive cam in the Trans Ams and Camaros gives it a slightly lower HP number. I'd bet that's the only difference in the LS1 engine models, but there may be some minor others. The cam each LS1 model runs is the main reason for the differences though.
Also, a stock Trans Am is listed at 305 HP vs. a stock WS6 listed at 320 HP due to the ram air functionality of the WS6 over a non-WS6 Trans Am.
Also, a stock Trans Am is listed at 305 HP vs. a stock WS6 listed at 320 HP due to the ram air functionality of the WS6 over a non-WS6 Trans Am.
Corvettes and F-body's have the SAME exact LS1 with the SAME exact camshaft and the SAME exact horsepower rating. The only differences in the two will be the intake and exhaust, which is a +/-5 horsepower differential at best.
Nothing you said is even remotely true. The F-body's were rated much lower than Corvettes for 2 big, well-known reasons:
1.) They didn't want to **** off Corvette fans. How could GM justify spending $20,000 more for a Corvette when they can get an F-body with the same horsepower and the same driveline for $20,000 less? Corvette owners have to be the top dog, so to satisfy them, they made it seem like the Corvette was a much more powerful car, when in fact, it wasn't.
2.) Insurance purposes. Corvettes are a touring car, F-body's are a sports car. F-body's cost more money to insure, so the horsepower rating was cut.
Same engine, same horsepower.
I'll bet you a dollar that they aren't the EXACT same engines. Look up the part numbers for the C5 and F-body camshafts for each year. Then, look up the specs on each cam...they're different. It's the only thing that is different (like you said, to keep costs down in manufacturing), but the F-body cams were less aggressive to try and make them slightly less powerful than the C5's. I'm not saying that C5's make more power, just that that's how GM planned it. Like it was said above, they are powerplants. You don't know what you're going to get from them until you put it on the dyno and run it. And the F-bodies came off making very similar power to the C5's, so the R&D on making a different camshaft for F-bodies and C5's was pointless.
00-02's also got the rediculous EGR system that 98-99's missed out on (just remembered that). I may be wrong about the cams, but that's why I only bet a dollar on it above. I was pretty sure I saw somewhere that they were different, if I find it I'll let you know. Again, I'm not positive.
You're spewing a lot of very wrong info here, man
![Nono](https://ls1tech.com/forums/images/smilies2/nono.gif)
Corvettes dynoed lower than F-body's because the IRS in the Corvette ate up a little rwhp.
Last edited by ChocoTaco369; 01-15-2008 at 01:32 PM.
#35
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
98-00 has egr 01-02 doesn't
01-02 have smaller cam / ls6 intake and the 99-00 have ls1 intake but a bigger cam
01-02 have 241 heads also 98-02 have bigger injectors and the shitty heads, there are several thing that are different about the year models
also just about every year they improved the oiling of the blocks
but all the engine still made about 350
but the vettes got much better cams and heads so most made about 375hp
01-02 have smaller cam / ls6 intake and the 99-00 have ls1 intake but a bigger cam
01-02 have 241 heads also 98-02 have bigger injectors and the shitty heads, there are several thing that are different about the year models
also just about every year they improved the oiling of the blocks
but all the engine still made about 350
but the vettes got much better cams and heads so most made about 375hp
Last edited by KillerZO6; 01-15-2008 at 02:16 PM.
#36
11 Second Club
iTrader: (9)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
The book I have indicates that for 1998-2000 the f-body cam had .500 lift, 209(e)/198(i) duration, 119.5 LSA, 117/122 timing vs the Vette for 1998-99 with .479(e)/.472(i) lift, 207(e)/199(i) duration, 117 LSA, 113/117 timing - they are different.
The 2000 Vette got .500 lift, 209(e)/198(i) duration, 115.5 LSA, 112/119 timing - that's different.
For 2001-02, the F-body and Vette got the same cam, .479(e)/.467(i) lift, 207(e)/196(i) duration, 116 LSA, 117/115 timing.
That's all exclusive of the LS6/Z06.
01-02 Vette & F-body all got the Ls6 intake.
So, prior to 2001, the F-body and Vette did have different cams, but for 2001-02 the Ls1's engines were identical. Based on a book I have -Chevy LS1/LS6 Performance, Endres, 1st ed. 2003.
The 2000 Vette got .500 lift, 209(e)/198(i) duration, 115.5 LSA, 112/119 timing - that's different.
For 2001-02, the F-body and Vette got the same cam, .479(e)/.467(i) lift, 207(e)/196(i) duration, 116 LSA, 117/115 timing.
That's all exclusive of the LS6/Z06.
01-02 Vette & F-body all got the Ls6 intake.
So, prior to 2001, the F-body and Vette did have different cams, but for 2001-02 the Ls1's engines were identical. Based on a book I have -Chevy LS1/LS6 Performance, Endres, 1st ed. 2003.
#37
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Not all of it. I did admit above I had the EGR years backwards above. It was late.
No, they didn't. Call your local GM parts counter and ask for the part numbers. They're different.
This I agree with, but more toward when they built the '04 GTO compared to the Corvette.
Nope. Look up the part numbers at your local GM parts counter for the OEM's for each car and each year.
Yes, I ADMITTED above that I had it backward. Let's move on since we agree that what I said above (originally) about the EGR's was WRONG.
Not all of it was wrong. ![Punch](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_punch.gif)
![Engarde](https://ls1tech.com/forums/images/smilies3/engarde.gif)
This I agree with as well.
...The F-body's were rated much lower than Corvettes for 2 big, well-known reasons:
1.) They didn't want to **** off Corvette fans. How could GM justify spending $20,000 more for a Corvette when they can get an F-body with the same horsepower and the same driveline for $20,000 less? Corvette owners have to be the top dog, so to satisfy them, they made it seem like the Corvette was a much more powerful car, when in fact, it wasn't...
1.) They didn't want to **** off Corvette fans. How could GM justify spending $20,000 more for a Corvette when they can get an F-body with the same horsepower and the same driveline for $20,000 less? Corvette owners have to be the top dog, so to satisfy them, they made it seem like the Corvette was a much more powerful car, when in fact, it wasn't...
![Punch](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_punch.gif)
![Engarde](https://ls1tech.com/forums/images/smilies3/engarde.gif)
![Grin](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_grin.gif)
#38
#39
Tech Resident
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Hmm, I guess I'm wrong about the pre '01 LS1's. I've never heard anyone mention cam differences, EVER, and there's been dozens of F-body vs. Corvette LS1 threads in the past. My apologies. The horsepower ratings were still unaffected, though, as the F-body's on average dynoed considerably higher than the Corvettes due to the IRS vs. solid rear axle, so it really is a moot point when you think about it.
The simple fact remains, the horsepower differences were negligible in all Corvette vs. F-body LS1's and nonexistent in the '01-'02's.
The simple fact remains, the horsepower differences were negligible in all Corvette vs. F-body LS1's and nonexistent in the '01-'02's.
#40
TECH Resident
iTrader: (1)
Join Date: Jan 2007
Location: bentonville, arkansas
Posts: 778
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
i would say that could easily be true. my 02' z28 put 325hp at the wheels when it was still completely stock.
p.s. for all the guys out their that say that ls1 Corvettes have more hp than ls1 f-bodys you are WRONG! thats just something gm said to make people feel better about spending a lot more cash for the same motor. i am not saying corvettes are bad, i am saying people who buy a vette are paying for the name and a better handling suspension. thats it
p.s. for all the guys out their that say that ls1 Corvettes have more hp than ls1 f-bodys you are WRONG! thats just something gm said to make people feel better about spending a lot more cash for the same motor. i am not saying corvettes are bad, i am saying people who buy a vette are paying for the name and a better handling suspension. thats it
Last edited by sixpack_2_go; 01-15-2008 at 06:27 PM.