Opinions on this cam, HP & tuners results.
05-23-2005, 11:04 PM
#1
Opinions on this cam, HP & tuners results. Looking for an opinion on a dyno tune.
I DID tell the tuner that I don’t bracket race.
I DID tell him that I liked to drive fast for extended periods.
I DID tell him that I liked to WOT runs occasionally.
I DIDN’T tell him that I was going to be driving the Silver State Classic or other road race.
Regardless, he said after he tuned the car that he was conservative on the A/F ratio & timing at high rpm to bring down CHT for extended runs to provide a safety margin for the heads, but that I lost a minor amount of horsepower.
On the dyno, the run yielded:
Max horsepower 371 @ ~5500 - 6000rpm, MAX torque 342
Q I think that he was too conservative. What do you think?
Also the idle seems a bit high @ 900 rpm, and also rougher than I expected.
As rough as the Hot Cam guys describe their cars with their 112° lobe separation.
With my 144° LS & Comp Cams grind, I expected a more stealthy idle.
Q Could the tuner have misprogrammed the idle?
Info on the car:
2002 LS2 manual transmission.
Ported Throttle Body, smooth bellows, SLP Underdrive Pulley 180° thermostat
Dynatech SuperMAXX Header System {High-Flow Catalytic Converters & all oxygen sensors present.}
Comp Cams shaft installed:
GRIND #: LS1 3767R /3753R HR114.0
GROSS VALVE LIFT .532 .535
DURATION @ .050 220.00 224.00
LOBE SEPARATION 114.0
ROCKER ARM RATIO 1.70
Coolant fan temperatures: Primary ON @ 200° OFF @ 190°
Secondary ON @ 210° OFF @ 200°
PCM Rev Limit set to 6600rpm, Shift @ 5800rpm
Premium Fuel Only, prefer Mobil 93 octane.
A/F ratio 13.1 to 5000rpm, 12.8 above 5000rpm.
Timing: 22° Total Timing
Curb Idle @ 900 rpm
I DID tell the tuner that I don’t bracket race.
I DID tell him that I liked to drive fast for extended periods.
I DID tell him that I liked to WOT runs occasionally.
I DIDN’T tell him that I was going to be driving the Silver State Classic or other road race.
Regardless, he said after he tuned the car that he was conservative on the A/F ratio & timing at high rpm to bring down CHT for extended runs to provide a safety margin for the heads, but that I lost a minor amount of horsepower.
On the dyno, the run yielded:
Max horsepower 371 @ ~5500 - 6000rpm, MAX torque 342
Q I think that he was too conservative. What do you think?
Also the idle seems a bit high @ 900 rpm, and also rougher than I expected.
As rough as the Hot Cam guys describe their cars with their 112° lobe separation.
With my 144° LS & Comp Cams grind, I expected a more stealthy idle.
Q Could the tuner have misprogrammed the idle?
Info on the car:
2002 LS2 manual transmission.
Ported Throttle Body, smooth bellows, SLP Underdrive Pulley 180° thermostat
Dynatech SuperMAXX Header System {High-Flow Catalytic Converters & all oxygen sensors present.}
Comp Cams shaft installed:
GRIND #: LS1 3767R /3753R HR114.0
GROSS VALVE LIFT .532 .535
DURATION @ .050 220.00 224.00
LOBE SEPARATION 114.0
ROCKER ARM RATIO 1.70
Coolant fan temperatures: Primary ON @ 200° OFF @ 190°
Secondary ON @ 210° OFF @ 200°
PCM Rev Limit set to 6600rpm, Shift @ 5800rpm
Premium Fuel Only, prefer Mobil 93 octane.
A/F ratio 13.1 to 5000rpm, 12.8 above 5000rpm.
Timing: 22° Total Timing
Curb Idle @ 900 rpm
05-23-2005, 11:31 PM
#2
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I'd say there's a good chance that it could gain a lot with more aggressive spark. Optimum spark varies on each car but on average most ls1's like 26-29 degrees.
05-24-2005, 05:00 AM
#3
1) Dyno runs can vary +/- 10 hp on any given day
2) 22* total timing does seem a bit conservative
3) I felt the same way about my "rough" idle for about a week (after the install). The more I drove the stealthier it became. It's been about a year now, and about 30 seconds after startup it runs like stock (a little sewing machine sound).
2) 22* total timing does seem a bit conservative
3) I felt the same way about my "rough" idle for about a week (after the install). The more I drove the stealthier it became. It's been about a year now, and about 30 seconds after startup it runs like stock (a little sewing machine sound).
05-24-2005, 08:06 AM
#4
Originally Posted by DD966
1) Dyno runs can vary +/- 10 hp on any given day
2) 22* total timing does seem a bit conservative
3) I felt the same way about my "rough" idle for about a week (after the install). The more I drove the stealthier it became. It's been about a year now, and about 30 seconds after startup it runs like stock (a little sewing machine sound).
2) 22* total timing does seem a bit conservative
3) I felt the same way about my "rough" idle for about a week (after the install). The more I drove the stealthier it became. It's been about a year now, and about 30 seconds after startup it runs like stock (a little sewing machine sound).
Did you do anything to the TB to help your idle?
Thanks!
05-25-2005, 01:13 PM
#6
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Join Date: Dec 2003
Location: Nortern Idaho
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Originally Posted by fnbrowning
Looking for an opinion on a dyno tune.
I DID tell the tuner that I don’t bracket race.
I DID tell him that I liked to drive fast for extended periods.
I DID tell him that I liked to WOT runs occasionally.
I DIDN’T tell him that I was going to be driving the Silver State Classic or other road race.
Regardless, he said after he tuned the car that he was conservative on the A/F ratio & timing at high rpm to bring down CHT for extended runs to provide a safety margin for the heads, but that I lost a minor amount of horsepower.
On the dyno, the run yielded:
Max horsepower 371 @ ~5500 - 6000rpm, MAX torque 342
Q I think that he was too conservative. What do you think?
Also the idle seems a bit high @ 900 rpm, and also rougher than I expected.
As rough as the Hot Cam guys describe their cars with their 112° lobe separation.
With my 144° LS & Comp Cams grind, I expected a more stealthy idle.
Q Could the tuner have misprogrammed the idle?
Info on the car:
2002 LS2 manual transmission.
Ported Throttle Body, smooth bellows, SLP Underdrive Pulley 180° thermostat
Dynatech SuperMAXX Header System {High-Flow Catalytic Converters & all oxygen sensors present.}
Comp Cams shaft installed:
GRIND #: LS1 3767R /3753R HR114.0
GROSS VALVE LIFT .532 .535
DURATION @ .050 220.00 224.00
LOBE SEPARATION 114.0
ROCKER ARM RATIO 1.70
Coolant fan temperatures: Primary ON @ 200° OFF @ 190°
Secondary ON @ 210° OFF @ 200°
PCM Rev Limit set to 6600rpm, Shift @ 5800rpm
Premium Fuel Only, prefer Mobil 93 octane.
A/F ratio 13.1 to 5000rpm, 12.8 above 5000rpm.
Timing: 22° Total Timing
Curb Idle @ 900 rpm
I DID tell the tuner that I don’t bracket race.
I DID tell him that I liked to drive fast for extended periods.
I DID tell him that I liked to WOT runs occasionally.
I DIDN’T tell him that I was going to be driving the Silver State Classic or other road race.
Regardless, he said after he tuned the car that he was conservative on the A/F ratio & timing at high rpm to bring down CHT for extended runs to provide a safety margin for the heads, but that I lost a minor amount of horsepower.
On the dyno, the run yielded:
Max horsepower 371 @ ~5500 - 6000rpm, MAX torque 342
Q I think that he was too conservative. What do you think?
Also the idle seems a bit high @ 900 rpm, and also rougher than I expected.
As rough as the Hot Cam guys describe their cars with their 112° lobe separation.
With my 144° LS & Comp Cams grind, I expected a more stealthy idle.
Q Could the tuner have misprogrammed the idle?
Info on the car:
2002 LS2 manual transmission.
Ported Throttle Body, smooth bellows, SLP Underdrive Pulley 180° thermostat
Dynatech SuperMAXX Header System {High-Flow Catalytic Converters & all oxygen sensors present.}
Comp Cams shaft installed:
GRIND #: LS1 3767R /3753R HR114.0
GROSS VALVE LIFT .532 .535
DURATION @ .050 220.00 224.00
LOBE SEPARATION 114.0
ROCKER ARM RATIO 1.70
Coolant fan temperatures: Primary ON @ 200° OFF @ 190°
Secondary ON @ 210° OFF @ 200°
PCM Rev Limit set to 6600rpm, Shift @ 5800rpm
Premium Fuel Only, prefer Mobil 93 octane.
A/F ratio 13.1 to 5000rpm, 12.8 above 5000rpm.
Timing: 22° Total Timing
Curb Idle @ 900 rpm
t-stat to get h20 temps down. Then bump up timing. I'd also recommend SVO
30#. Doing alot of hi-speed running going to tax your injectors. I have these
mods on my 2002SS & woke up my car. 93 Octane is good insurance, tho I
can,t get it in my area. Also if legal a good h20/injection setup would help with CHTemps and aggressive timing. I have one on my car and gained about
30hp/tq.
