MTI Stealth I & II vs. LPE GT2-3.....Power vs. Idle
07-26-2005, 06:12 PM
#1
MTI Stealth I & II vs. LPE GT2-3.....Power vs. Idle I need some help choosing a bumpstick for my LS1.......but I'm following some tight guidelines. The car will be used for street action so I must stress, even a slightly noticeable lope won't work. The car currently has Kooks LTs w/ Corsa, but has a catted-Y. Also, I'm looking to spray the car in the near future (if it will matter on such a small cam) and port the stock 241 heads. I'm just scratching the surface of the "sleeper" cam info out there, but from what I can tell the MTIs will give slightly better #'s, but the GT2-3 will sound dead-stock. I'd appreciate any advice/knowledge you guys can share....
07-26-2005, 09:25 PM
#2
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the gt2-3 would be a good candidate for spray. i've been running this cam since march and you can't even tell that anything has been changed. even with lt's you can't tell the difference. i've posted graphs of before/after adding the cam and then after adding lt's.
07-28-2005, 06:21 PM
#7
Originally Posted by PREDATOR-Z
10.87 in the 1/4, on a 150 shot dry, cam only + boltons A4 (Stealth II)
Originally Posted by SiL3NtXWS6
i had a 212/218 .563 .563 115 LSA that ran perfect on a stock tune, it was impossible to tell it was cammed through full exhaust.
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07-28-2005, 08:31 PM
#8
Below is my Stealth II dyno, I should have track numbers soon but my Z is probably alot lighter then yours 
Whats really impressive is the Torque and if you compare it to the ported LS1 heads and 232/230 595/595 114 cam I had in my WS6. I think the WS6 dyno'd 2rwhp more but overall the Stealth II with stock LS6 heads did better. Both runs were on the same dyno.
Idle is close to stock but remember the 01 LS6 cam with a 116LSA cam. But really unless you are hella picky any of those cams with Tuning are going to be very close to stock, I do hear the sewing maching in the valvetrain but I hear that in my stock cam 98 vert too just not as loud.
Down low is better than stock which suprised me quite a bit, up top the car has always been violent and is even more so now. It goes kinda sideways on the 2-3 shift breaking loose which it did not do before the cam.
This graph is only after about an hour of tuning too there is probably more in it with Tuning, a pulley and a ported TB which are my next purchases. I don't think Nitrous at the levels you are talking are going to matter in these cams. If you had a race setup with a 200 shot then it might....JMHO the Stealth II is a great cam if you want something that drives stock but just more of it, which is exactly what I wanted in my Z.
Whats really impressive is the Torque and if you compare it to the ported LS1 heads and 232/230 595/595 114 cam I had in my WS6. I think the WS6 dyno'd 2rwhp more but overall the Stealth II with stock LS6 heads did better. Both runs were on the same dyno.Idle is close to stock but remember the 01 LS6 cam with a 116LSA cam. But really unless you are hella picky any of those cams with Tuning are going to be very close to stock, I do hear the sewing maching in the valvetrain but I hear that in my stock cam 98 vert too just not as loud.
Down low is better than stock which suprised me quite a bit, up top the car has always been violent and is even more so now. It goes kinda sideways on the 2-3 shift breaking loose which it did not do before the cam.
This graph is only after about an hour of tuning too there is probably more in it with Tuning, a pulley and a ported TB which are my next purchases. I don't think Nitrous at the levels you are talking are going to matter in these cams. If you had a race setup with a 200 shot then it might....JMHO the Stealth II is a great cam if you want something that drives stock but just more of it, which is exactly what I wanted in my Z.
07-28-2005, 08:35 PM
#9
Originally Posted by Pimpium57
How is the idle quality? Would I be able to walk up to your car and tell it's cammed if I listen with a close ear?
07-29-2005, 02:32 AM
#10
93TAWicked1, What made you go with the Stealth II over the I? Would the I be any "quieter" at idle? As I said, this is going in a car that will be street-raced (only in my dreams, for those who care), which is why I'm being very picky on the sound.
07-29-2005, 02:51 AM
#11
Well the stealth II is a more aggressive cam and seems that other people have had some very good results with the Stealth II, they both will probably idle about the same the II is bigger but it also has the wider LSA, the I is small but on a 115. If you had stock exaust the GT2-3 would be the choice (thats the LPE cam on a 117.5 right with a big standard split?) But in a car with some exaust the stealth II is a nice cam... I was worried that I would get the high Peak HP and loose low end torque with the reverse split. What I got was the opposite just show how little I really know about cam choices!!!!!
In short I made a goal for the car HP and driveablity wise, researched the boards talked to a few owners of similar setups. Looked at Dyno sheets, saw videos and talked to tuners. Found that the Steath II seemed to match my goals for a off the shelf grind and went with it. It has exceeded my expectations......Although I'm still curious to see how she'd run with an FM13 on a 114.....
In short I made a goal for the car HP and driveablity wise, researched the boards talked to a few owners of similar setups. Looked at Dyno sheets, saw videos and talked to tuners. Found that the Steath II seemed to match my goals for a off the shelf grind and went with it. It has exceeded my expectations......Although I'm still curious to see how she'd run with an FM13 on a 114.....
08-02-2005, 10:16 AM
#13
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I like my gt2-3. It sounds close to stock. A very slight lope to it, but not really noticable. Go with 918 springs, not the ls6 ones (they are rated to 550 lift). You'll see 20-30 rwhp.
08-02-2005, 04:35 PM
#14
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93TA,
Do you know if the Stealth II typically dyno's higher than the I?
Do you have any track times?
I know someone who is currently running a stock Z06 motor with LTs and gears/12 bolt who is thinking about running this cam. It put down ~ 360 to the wheels with those mods. Would the Stealth II benefit much from ported LS6 heads?
Do you know if the Stealth II typically dyno's higher than the I?
Do you have any track times?
I know someone who is currently running a stock Z06 motor with LTs and gears/12 bolt who is thinking about running this cam. It put down ~ 360 to the wheels with those mods. Would the Stealth II benefit much from ported LS6 heads?
08-02-2005, 04:45 PM
#15
Originally Posted by MaximusPrime
93TA,
Do you know if the Stealth II typically dyno's higher than the I?
Do you have any track times?
I know someone who is currently running a stock Z06 motor with LTs and gears/12 bolt who is thinking about running this cam. It put down ~ 360 to the wheels with those mods. Would the Stealth II benefit much from ported LS6 heads?
Do you know if the Stealth II typically dyno's higher than the I?
Do you have any track times?
I know someone who is currently running a stock Z06 motor with LTs and gears/12 bolt who is thinking about running this cam. It put down ~ 360 to the wheels with those mods. Would the Stealth II benefit much from ported LS6 heads?
Do not have any track times and to me really track times are worthless there are so many variables there are vettes with the same HP and torque as myself that are in the very low 11's. I would be happy if I ran an 11.9. I imagine the car with traction and a good driver could get the low 11's. But your comparing a Z06 to an F-body and there are alot of variables in that. My WS6 with 3:42's and a similiar HP band ran 12.9 at 110 at the track. My stock Z06 on the same day ran a 13.0 at 112 both cars had above 2 60fts.
I think the Stealth II cam would benifet alot from ported heads I think I read a guy with out of the Box AFR 205's and a stealth II runs like 430rwhp.
But to really answer your question I'd have to know more about what is wanted. You can get 430 out of a cam only Ls6 pretty easy, just sacrifice a little stock idle and drivability. The Stealth is only a good choice if you want that stock idle and somewhat stock powerband (I know I picked up quite a bit down low with this setup)
If you don't mind a little lope I'd recommend the F13, with tuning and gears it would be extremely drivable. On the right grind your mom could probably drive the car and not think much of it.
I bet in your friend case with the Stealth II he'd put at least 380-390 to the wheels and it would drive just like it does now which is pretty cool IMHO.
08-03-2005, 02:30 AM
#17
TECH Senior Member
I'm about to install a set of PRC 5.3 stage 2.5 heads on. I will be expecting 425>430 rwhp.
The one thing is The Stealth II makes really good trq everywhere and with a stall and 3:73 's , 285/18's YOKO, you have to be careful how you handle it.
I've beaten many nasty loping cams around because by the time they reach their powerband, I'm already 2 cars ahead, and just when you see them starting to come back, one push on a button and a 150 hp to the wheels leaves planted like a 2 ton bus. No surging, bucking, hunting for idle, exhaust fumes that will burn your eyes, just a nice nervous rapid lope that is just waiting to be unleashed.
The one thing is The Stealth II makes really good trq everywhere and with a stall and 3:73 's , 285/18's YOKO, you have to be careful how you handle it.
I've beaten many nasty loping cams around because by the time they reach their powerband, I'm already 2 cars ahead, and just when you see them starting to come back, one push on a button and a 150 hp to the wheels leaves planted like a 2 ton bus. No surging, bucking, hunting for idle, exhaust fumes that will burn your eyes, just a nice nervous rapid lope that is just waiting to be unleashed.
08-03-2005, 02:50 AM
#18
Originally Posted by PREDATOR-Z
I'm about to install a set of PRC 5.3 stage 2.5 heads on. I will be expecting 425>430 rwhp.
The one thing is The Stealth II makes really good trq everywhere and with a stall and 3:73 's , 285/18's YOKO, you have to be careful how you handle it.
I've beaten many nasty loping cams around because by the time they reach their powerband, I'm already 2 cars ahead, and just when you see them starting to come back, one push on a button and a 150 hp to the wheels leaves planted like a 2 ton bus. No surging, bucking, hunting for idle, exhaust fumes that will burn your eyes, just a nice nervous rapid lope that is just waiting to be unleashed.
The one thing is The Stealth II makes really good trq everywhere and with a stall and 3:73 's , 285/18's YOKO, you have to be careful how you handle it.
I've beaten many nasty loping cams around because by the time they reach their powerband, I'm already 2 cars ahead, and just when you see them starting to come back, one push on a button and a 150 hp to the wheels leaves planted like a 2 ton bus. No surging, bucking, hunting for idle, exhaust fumes that will burn your eyes, just a nice nervous rapid lope that is just waiting to be unleashed.
So you like yours
I'm thinking about some milled AFR's figure I can get around 850 for my LS6 heads. Would expect about the same 430rhp then with a pulley, TB and a WP it might get interesting....
08-03-2005, 02:57 AM
#19
Also there is a vid of my fat *** and car idling in the LS1video site and here is one of the dyno run: http://www.putfile.com/media.php?n=dynotest
It sounds agressive but you have to realize its through headers and flowmaster 1 chamber race mufflers.
It sounds agressive but you have to realize its through headers and flowmaster 1 chamber race mufflers.
