rubrick1

I was looking for some input from the cam experts on here.

I would like to go back to a stock 3.42 geared 10 bolt instead of the 4.10 geared 12 bolt I have now in my M6 99 TA. The car has a 224 cam in it now. What would the experts think of say a 200/210 .600 lift 110-112* LSA cam on an ECS or similar lobe? I would also like to go back to exhaust manifolds instead of headers, I hate noise, especially drone.


How do you think such a cam would idle/perform? I'm figuring it should make about the same power as an 01 LS6 cam due to the added lift. It would also be 3.42 gear friendly, which is really important to me.


I'm personally familiar with Stealth 2 cam and have read up on the TR Cheater Cam and although I loved the Stealth 2 and have read good things about the Cheater Cam, both raise the RPM peaks for HP/TQ. If anything, I'd like to lower the stock HP/TQ peaks to work better with the 3.42s.



Combined with this cam, a set of either stock or mildly ported LS6 heads with 918s, 90/90 combo, stock exh manifolds and cats, pulley, and all the other usual stuff, I'd be looking for a 120 trap speed at stock weight ( for me that's around 3650 with driver). My old 02 M6 Z28 ran 12.87 at 111.3 mph on a 60* day on the stock 16" Eagle RS-As with just a lid/filter/flowmaster catback, so I think 120 mph is very doable.


Thanks.

01ssreda4

iTrader: (96)

I really don't know where to go with this. I will wait and see what some of the others suggest. Actually I dont even know what exactly it is that your asking. You want torque peaks below stock but expect to trap 120 mph at full weight? You want torque increased but want to give up gear? You want quiet exhaust so you want to ditch your headers as a first option, an option that will surely take power with it? I'm assuming you are an M6, and you want to install a weak 10 bolt so you can make runs at the track? Dude, I don't think I could help you if I wanted to.

BTW, welcome to LS1tech.

rubrick1

LOL thanks for the welcome, haven't been on here in years.

Well it's like this. By changing the cam events and ending with a narrower LSA such as 110 instead of 116 like with a stock LS1 cam, the RPM where the TQ peak occurs will be lower. I can either gear up for a cam with a wider LSA or narrow down the LSA to work with a lower numerical rear gear.

The stock 3.42 gears are way too tall for even the stock cam because where the HP and TQ peaks is too high. Thus I want a cam that will lower the RPM where the peaks are, to work better with the 3.42s.

Headers are not only noisy but also a pain in the butt what with all the banging from the Y-pipe. 01+ exh manifolds should suffice for my goals. Wish I could use LS6 exh manifolds because they flow pretty well but they don't fit the F body.

This isn't going to be a drag setup, more of a quiet daily driver that can trap 120 in the 1/4. I've had good luck with the stock rear in the past because I don't run a very aggresive tire and because I go to the track very rarely. I prefer a Nitto 555R DR on the back and I prefer the stock rear over the 12 bolt I have now because like I said, I like it quiet. lol

I figure if a pretty much stock 319 RWHP 02 LS1 can trap 111.3 with a less than optimal rear gear ratio, then a more optimized combo would work better with those gears.

garygnu

do you have hiflow cats?if not install them ,this mite quiet things down a little.

ZMX

How about you keep your headers and get some better mufflers?

01ssreda4

iTrader: (96)

That's what I was getting at. Changing mufflers is a better approach to control sound rather then eliminating headers.

mtuggle86

iTrader: (7)

A few things 918s suck get pac 1518s, That's a tiny cam I really don't think you need a fast 90 at all for such a small cam/stock manifolds I would just run an ls6 with a ported tb. I wouldn't expect my car to trap 120 I really doubt with less cam, less gear, no headers, and the same or slightly better heads youl get anywhere close to 120.

darkvader0

What is your exhaust setup now post-headers?

studderin

iTrader: (28)

Lets see


346+NA= no

346+boost= yes
346+100shot= yes


3650# to trap 120 with peak power under 6K, with cats, and stock manifolds, and 3:42 gears.
a 346 with the killer heads, and intake but in thouse rpms is not going to go it.

You will need some leverage!
some cubes will make it a LOT easier. 4.10 or bighger crank

PREDATOR-Z

It can be done NA.

>Consider changing or getting the heads worked.
>Auto or M6? (If auto mild stall)
>Cam cut according to combo specs. Have to know Head prameters to choose cam.
> Think hard about keeping headers. You can always run a quiet muff and have a cutout. High flow cats a must, look at the stock Y you'll understand.

BaddBird

iTrader: (6)

Glad to see you back PREDATOR.

01ssreda4

iTrader: (96)

Hey Pred Z, long time no see.

rubrick1

Well like I said, F body headers are a pain because of the Y-pipe. I've owned 3 Fbodies with headers over the years and all of them banged the floor board. Great for power but annoying as hell. A custom true dual set-up that will both be quiet AND not bang can add up to big bucks. I know of a couple of guys who've done this and they spent 1600 on custom Kooks true duals.

The stock cam is good but it's not optimized for pure power because of EPA demands. Yet it still powers an M6 Fbody to 110+ MPH in the 1/4. LS6 cam is better but still handcuffed by the EPA. Now imagine a small cam that has way more lift to take advantage of the head flow potential of the LS1/LS6 head AND brings in the power sooner to take advantage of the stock gears.

I'm willing to bet a 200/210 cam with a 111 LSA and .600 lift would still idle better than a 224 cam on a 112/1114 LSA and make 10 or so more HP than a stock cam. It would also lower the HP/TQ peaks by 300-400 RPM over the stock cam, thus working better with the 3.42s. More power under the curve so to speak.

rubrick1

Here's a chart of the MPH vs RPM for a M6 Fbody with 3.42 gears. As you can see, 120 mph comes in at around 5400 RPM (sorry for the way the chart lines up). A cam that makes the HP peak to occur around 5200 would work far better than the stock cam which makes the HP peak occur around 5500 or so.



RPM 1st 2nd 3rd 4th 5th 6th Gears

500 4 6 9 11 15 22
600 5 8 10 13 18 27
700 6 9 12 16 21 31
800 7 10 14 18 24 36
900 8 11 15 20 27 40
1000 8 13 17 22 30 45
1100 9 14 19 25 33 49
1200 10 15 21 27 36 54
1300 11 16 22 29 39 58
1400 12 18 24 31 42 62
1500 13 19 26 33 45 67
1600 13 20 27 36 48 71
1700 14 21 29 38 51 76
1800 15 23 31 40 54 80
1900 16 24 33 42 57 85
2000 17 25 34 45 60 89
2100 18 26 36 47 63 94
2200 18 28 38 49 66 98
2300 19 29 39 51 69 103
2400 20 30 41 54 72 107
2500 21 31 43 56 75 112
2600 22 33 45 58 78 116
2700 23 34 46 60 81 121
2800 23 35 48 62 84 125
2900 24 36 50 65 87 129
3000 25 38 52 67 90 134
3100 26 39 53 69 94 138
3200 27 40 55 71 97 143
3300 28 41 57 74 100 147
3400 29 43 58 76 103 152
3500 29 44 60 78 106 156
3600 30 45 62 80 109 161
3700 31 46 64 83 112 165
3800 32 48 65 85 115 170
3900 33 49 67 87 118 174
4000 34 50 69 89 121 179
4100 34 51 70 92 124 183
4200 35 53 72 94 127 187
4300 36 54 74 96 130 192
4400 37 55 76 98 133 196
4500 38 56 77 100 136 201
4600 39 58 79 103 139 205
4700 39 59 81 105 142 210
4800 40 60 82 107 145 214
4900 41 61 84 109 148 219
5000 42 63 86 112 151 223
5100 43 64 88 114 154 228
5200 44 65 89 116 157 232
5300 44 66 91 118 160 237
5400 45 68 93 121 163 241
5500 46 69 94 123 166 246
5600 47 70 96 125 169 250
5700 48 71 98 127 172 254
5800 49 73 100 129 175 259
5900 50 74 101 132 178 263
6000 50 75 103 134 181 268