Low Cam Dyno Numbers?
08-11-2005, 11:32 PM
#23
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An LS6 IM and "slightly better" flowing exhaust manifolds DO NOT give you 25-30rwhp last time i checked. So something other than that is giving the 01/02's an edge. Everyone else i have spoken to seems to think otherwise about the heads.
Yes, my camaro is maintained well. Royal Purple every 3k miles, 93 octane, not driven hard, etc etc. I put down 330 before the LS6 IM and MAF, so to be conservative id say i would have dynod 340 with those additions. Id say thats pretty damn good for a bolt on car. I just dont see why my cam didnt add as much? Cant be the tune, as the A/F was dead on top of each other, and we cleared up the "rickety" effect with timing.....
Yes, my camaro is maintained well. Royal Purple every 3k miles, 93 octane, not driven hard, etc etc. I put down 330 before the LS6 IM and MAF, so to be conservative id say i would have dynod 340 with those additions. Id say thats pretty damn good for a bolt on car. I just dont see why my cam didnt add as much? Cant be the tune, as the A/F was dead on top of each other, and we cleared up the "rickety" effect with timing.....
08-12-2005, 12:11 AM
#25
Originally Posted by Krab
Your stock ls1 heads are no "shittier" than those of a '01-'02 ls1. The reason the newer ls1's put down more power is because they have the ls6 intake, slightly different cam specs, and I believe less restrictive exhaust manifolds. The block has nothing to do with the power they put down either.
Have you maintained your ls1 well? That could be another factor on why your numbers are on the low side. Do you have any oil consumption? Are your spark plugs good? Have you changed your fuel filter recently? These could be contributing factors.
Have you maintained your ls1 well? That could be another factor on why your numbers are on the low side. Do you have any oil consumption? Are your spark plugs good? Have you changed your fuel filter recently? These could be contributing factors.
I am gonna add some facts here.
The post above is right on some things and wrong on some others.
1. 1998-2000 cars had a larger cam than the 01-02 cars
2. 1998-1999 cars had more restrictive exhaust manifolds
3. 1998-2000 cars had an LS1 intake with EGR
4. 1998 cars have a completely different PCM from 99+ cars
In 1999
1. Cylinder heads and valve covers redesigned to have center bolts instead of perimeter bolts. Other than that, the heads were the same.
In 2000
1. Redesigned exhaust manifolds for new emissions standard actually flowed better and created a little more HP.
2001
1. A small percentage of 2001 and 2002 LS1s actually had LS6 blocks which had a different part number and a darker metal cast
2. Starting 2001, all LS1s came with an LS6 intake manifold without an EGR system
3. 2001-02 cars have a smaller cam from the Vortec truck engines to increase low end torque
2002.
1. 2002 LS1 head gaskets redesigned. The new ones are a pressed metal, as opposed to the graphite ones and are no longer specific to the side of the car theyre installed on
08-12-2005, 12:13 AM
#26
Head Casting Info
https://ls1tech.com/forums/showpost....2&postcount=41
Specific 2001 - 2002 Changes
https://ls1tech.com/forums/showpost....81&postcount=3
https://ls1tech.com/forums/showpost....2&postcount=41
Specific 2001 - 2002 Changes
https://ls1tech.com/forums/showpost....81&postcount=3
08-12-2005, 12:17 AM
#27
Here is the difference in the heads.
241 cast heads were Die Cast which is a process that smooths up the ports a bit compared to the Sand Cast procedure that was done on the 806 and 853 heads. Once ported any "advantage" the 241 cast had is moot.
Now there is some HP there stock vs stock but 15 more HP is out of the question.
I will add this.
Your dyno numbers are very low compaired to what other cars make with similar mods and even a smaller cam.
I would have it dynoed somewhere else and see if the dyno used just reads low.
If not then I would start looking for answers.
Make sure your have good exhaust as that can rob some power.
Get a nice ported TB. Hopefully the cam installed correctly and isn't a tooth off.
To me you should be making a additional 15-20HP with the combo you have.
241 cast heads were Die Cast which is a process that smooths up the ports a bit compared to the Sand Cast procedure that was done on the 806 and 853 heads. Once ported any "advantage" the 241 cast had is moot.
Now there is some HP there stock vs stock but 15 more HP is out of the question.
I will add this.
Your dyno numbers are very low compaired to what other cars make with similar mods and even a smaller cam.
I would have it dynoed somewhere else and see if the dyno used just reads low.
If not then I would start looking for answers.
Make sure your have good exhaust as that can rob some power.
Get a nice ported TB. Hopefully the cam installed correctly and isn't a tooth off.
To me you should be making a additional 15-20HP with the combo you have.
08-12-2005, 06:13 PM
#28
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Originally Posted by JZ'sTA
Here is the difference in the heads.
241 cast heads were Die Cast which is a process that smooths up the ports a bit compared to the Sand Cast procedure that was done on the 806 and 853 heads. Once ported any "advantage" the 241 cast had is moot.
Now there is some HP there stock vs stock but 15 more HP is out of the question.
I will add this.
Your dyno numbers are very low compaired to what other cars make with similar mods and even a smaller cam.
I would have it dynoed somewhere else and see if the dyno used just reads low.
If not then I would start looking for answers.
Make sure your have good exhaust as that can rob some power.
Get a nice ported TB. Hopefully the cam installed correctly and isn't a tooth off.
To me you should be making a additional 15-20HP with the combo you have.
241 cast heads were Die Cast which is a process that smooths up the ports a bit compared to the Sand Cast procedure that was done on the 806 and 853 heads. Once ported any "advantage" the 241 cast had is moot.
Now there is some HP there stock vs stock but 15 more HP is out of the question.
I will add this.
Your dyno numbers are very low compaired to what other cars make with similar mods and even a smaller cam.
I would have it dynoed somewhere else and see if the dyno used just reads low.
If not then I would start looking for answers.
Make sure your have good exhaust as that can rob some power.
Get a nice ported TB. Hopefully the cam installed correctly and isn't a tooth off.
To me you should be making a additional 15-20HP with the combo you have.
What do you mean "a tooth off"? What else could have gone wrong in the install that would rob power yet not cause the car to drive like ****?
08-12-2005, 09:01 PM
#30
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Originally Posted by ZeeTwentyEight
wattabout my clutch, its been slipping now for awhile (stock clutch), is it possible for it to slip slightly, yet not that noticeably, and put down less power?
08-12-2005, 09:07 PM
#31
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I've seen 98's always make less power, I would tend to agree that its in the heads. On my brother's 98 T/A we swapped from a 224 camshaft and 98 heads to a 233/239 with stock '02 "241" heads and it picked up 50rwhp exactly. Thats not all from the camshaft.
One thing I noticed in quite a few teardowns was the earlier heads seemed to have a different valvejob done to the heads than the 00+ heads, the intake valves are backcut on '00-'02 heads and the newer exhaust valves are similiar to the truck valves which tend to flow more air. So while I believe the port castings themselves to be similiar through all the years, there are other things that affect airflow other than the port itself.
One thing I noticed in quite a few teardowns was the earlier heads seemed to have a different valvejob done to the heads than the 00+ heads, the intake valves are backcut on '00-'02 heads and the newer exhaust valves are similiar to the truck valves which tend to flow more air. So while I believe the port castings themselves to be similiar through all the years, there are other things that affect airflow other than the port itself.
That was with factory TB and intake.
08-12-2005, 09:51 PM
#33
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My 98 made 385 rwhp cam only through a 4000 stall converter. 
At first it made 343, but I added an LS6 intake and SLP underdrive pulley and netted 42 rwhp in the process.
At first it made 343, but I added an LS6 intake and SLP underdrive pulley and netted 42 rwhp in the process.
08-12-2005, 09:59 PM
#34
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Thanks for the help guys. looks like im in need of some heads, and a few other things. Im strapping the spray on sunday, so hopefully that will wake up the motor a bit.