Stealth II Cam - Not too good
10-01-2005, 02:52 PM
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Stealth II Cam - Not too good My buddy finally got to test out his new stealth II cam today at the track. He had a stock LS6 engine, stock MAF, stock TB, lid, and LTs. (6 speed) He previously went 11.80s and had trapped as high as 118 with that setup. Earlier this year in hot muggy air, he ran consistent 12.1s and consistently trapped 114 to 115 with a slipping clutch.
Today at the track after putting in a new clutch, ASP pulley and the stealth II, he couldn't go any faster than 12.3 and was trapping 110 to 111. The air was pretty good (60s & 70s) but the car just ran like ****.
Not sure what the deal is - I've heard many people say there is no comparison - the Stealth II is guaranteed to make more power and torque than the LS6. But it seems in this case the Stealth II actually made the car LOSE power. It appears somewhere from 40 to 60 HP by looking at trap speeds.
Today at the track after putting in a new clutch, ASP pulley and the stealth II, he couldn't go any faster than 12.3 and was trapping 110 to 111. The air was pretty good (60s & 70s) but the car just ran like ****.
Not sure what the deal is - I've heard many people say there is no comparison - the Stealth II is guaranteed to make more power and torque than the LS6. But it seems in this case the Stealth II actually made the car LOSE power. It appears somewhere from 40 to 60 HP by looking at trap speeds.
10-01-2005, 03:26 PM
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Originally Posted by MaximusPrime
My buddy finally got to test out his new stealth II cam today at the track. He had a stock LS6 engine, stock MAF, stock TB, lid, and LTs. (6 speed) He previously went 11.80s and had trapped as high as 118 with that setup. Earlier this year in hot muggy air, he ran consistent 12.1s and consistently trapped 114 to 115 with a slipping clutch.
Today at the track after putting in a new clutch, ASP pulley and the stealth II, he couldn't go any faster than 12.3 and was trapping 110 to 111. The air was pretty good (60s & 70s) but the car just ran like ****.
Not sure what the deal is - I've heard many people say there is no comparison - the Stealth II is guaranteed to make more power and torque than the LS6. But it seems in this case the Stealth II actually made the car LOSE power. It appears somewhere from 40 to 60 HP by looking at trap speeds.
Today at the track after putting in a new clutch, ASP pulley and the stealth II, he couldn't go any faster than 12.3 and was trapping 110 to 111. The air was pretty good (60s & 70s) but the car just ran like ****.
Not sure what the deal is - I've heard many people say there is no comparison - the Stealth II is guaranteed to make more power and torque than the LS6. But it seems in this case the Stealth II actually made the car LOSE power. It appears somewhere from 40 to 60 HP by looking at trap speeds.
10-01-2005, 03:36 PM
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It doesn`t make sense that a cam with much more lift and duration makes less power than a very smallish stock LS6 cam. My 02 Formula picked up 60hp and 60tq with that cam and Absolute heads over the all bolt ons +LTs deal.
10-01-2005, 05:16 PM
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Originally Posted by gomer
Did he have the new cam tuned at WOT on a dyno after installing it? What was the dyno numbers with the LS6 cam vs. the stealth II cam? Surely he didn't just stick it in there and not verify the WOT A/F ratio and timing.
Originally Posted by NumberOneSled
118mph with a stock LS6 w/long tubes?
10-01-2005, 05:21 PM
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Originally Posted by MaximusPrime
It made ~360 rwhp through a 12 bolt and 4.10 gears with the LS6 set up. After the installation of the Stealth II and ASP, it made 371 rwhp at a local tuner's shop.
Stock LS6 with LTs in a stock weight F-body with hi-flow cats going through the stock SLP dual-dual exhaust with no cutout. It has trapped 116, 117 and 118 multiple times with the LS6 setup.
Stock LS6 with LTs in a stock weight F-body with hi-flow cats going through the stock SLP dual-dual exhaust with no cutout. It has trapped 116, 117 and 118 multiple times with the LS6 setup.
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10-01-2005, 06:38 PM
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Originally Posted by gomer
What does this car weigh? 118mph traps with 360 ish rwhp thru a 12 bolt just don't sound right.. even in a 6 speed car.
Also you must consider the gears and 12 bolt which probably don't help dyno numbers, and this dyno has been known to put down low HP numbers.
Originally Posted by BlueSix
Who did the tune? Are they reputable and knowledgeable with the LSx engines?
Originally Posted by Runwhatchabrung
did the check driver light come on?
I rode in the car and it felt faster after the Stealth II cam install, but it produced much worse track times. Hell with the all LS6 motor, I've seen him miss a gear and still run 12.3 or 12.4 and end up with a ~110 trap. Now he's giving everything he's got and only pulling a 12.3 @ 110 with the Stealth II.
10-02-2005, 02:11 AM
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Originally Posted by PREDATOR-Z
Why blame the cam,
i trap 11.13x at 121 in a A4 with that cam and PRC 2.5, 5.3L heads, 11.x:1 SCR
Something else is not right.
i trap 11.13x at 121 in a A4 with that cam and PRC 2.5, 5.3L heads, 11.x:1 SCR
Something else is not right.
What else should we blame? Gremlins? Maybe a ghost got in there and blocked the MAF from getting 100% of the air flow. That makes sense. Oh, yeah maybe God got in there and slowed his car down because of some sins that went on earlier in the week that hadn't been repented. There, that makes sense. I feel better now. I'll tell him to take it to church tomorrow morning and have the Pastor do a full Holy Water tune to make everything better. I'm sure he'll be trapping 121 in no time.
10-02-2005, 02:29 AM
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Originally Posted by MaximusPrime
What else should we blame? Gremlins? Maybe a ghost got in there and blocked the MAF from getting 100% of the air flow. That makes sense. Oh, yeah maybe God got in there and slowed his car down because of some sins that went on earlier in the week that hadn't been repented. There, that makes sense. I feel better now. I'll tell him to take it to church tomorrow morning and have the Pastor do a full Holy Water tune to make everything better. I'm sure he'll be trapping 121 in no time.
Nino
10-02-2005, 09:39 AM
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Im sorry but a stock motor w/ bolt ons @ 3700 LBS WILL NOT TRAP 118. Unless you guys are using a g-tech to get those times.Wait for some better air and go to the track then.
10-02-2005, 09:44 AM
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Originally Posted by silverbeast
Im sorry but a stock motor w/ bolt ons @ 3700 LBS WILL NOT TRAP 118. Unless you guys are using a g-tech to get those times.Wait for some better air and go to the track then.
10-02-2005, 10:13 AM
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Originally Posted by silverbeast
Im sorry but a stock motor w/ bolt ons @ 3700 LBS WILL NOT TRAP 118. Unless you guys are using a g-tech to get those times.Wait for some better air and go to the track then.
As to the loss of performance with this car, what valve springs are you running?
Bruce
10-02-2005, 11:11 AM
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Originally Posted by Hardtop
Yes it will. There is a local guy from VA, Hihosilver I believe. He had a stock LS6 with LT's in a Camaro. That car trapped 118 or better.
As to the loss of performance with this car, what valve springs are you running?
Bruce
As to the loss of performance with this car, what valve springs are you running?
Bruce
10-02-2005, 11:46 AM
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Even though Mr Prime was not very nice, i'll try to help:
What is the lifter preload, did you use 7.35 p-rods? (LS6 valves are taller by 6mm, so 7.40 p-rods will be too long) been there done that.
You said it was tuned, do you have the graph?
What are your injector cycle at? What is your fuel pressure at WOT?
What is your A/F/R?
What is the lifter preload, did you use 7.35 p-rods? (LS6 valves are taller by 6mm, so 7.40 p-rods will be too long) been there done that.
You said it was tuned, do you have the graph?
What are your injector cycle at? What is your fuel pressure at WOT?
What is your A/F/R?
10-02-2005, 11:56 AM
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I'm sorry PREDATOR for my sarcastic reply to you. Just a little frustrated with the situation. The car is probably going back to the tuner this week. I don't have the dyno graph but I do know that it pulled about 370 after the cam install. I'll see if I can find the graph and post it. I appreciate everyone's help.
Silver - I know a 3700 pound car trapping 118 may not seem right to you, but maybe the dyno read low? Maybe it really had more power than that. But you can stop doubting what the car ran, because its done it and that's all there is to it.
Silver - I know a 3700 pound car trapping 118 may not seem right to you, but maybe the dyno read low? Maybe it really had more power than that. But you can stop doubting what the car ran, because its done it and that's all there is to it.
10-02-2005, 12:04 PM
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No problem man, it was kinda funny.
I used 241 heads but with LS6 valves (7.35 p-rod). I still have that cam in. Being a Stealth freak, I love that cam. I made 404rwhp with 10.5 SCR, cam only and now I'm at 429rwhp with 5.3L heads.
I would analyse that sucker live for any KR and stuff and measure preload on it. Too much preload will make you loose power fast.
I used 241 heads but with LS6 valves (7.35 p-rod). I still have that cam in. Being a Stealth freak, I love that cam. I made 404rwhp with 10.5 SCR, cam only and now I'm at 429rwhp with 5.3L heads.
I would analyse that sucker live for any KR and stuff and measure preload on it. Too much preload will make you loose power fast.