McRat

2 Z06's with good drivers at the track today:

~3250lb Long Tubes, Catback, "Secret Spec Large Cam 3", BFG's = 120 mph.
~3400lb Long Tubes, Stock Muffler, Z06 Cam, ET Streets = 118 mph

Factor in the weight, and the ET Street mph losses, and well, it's about a wash. Both cars were shifted at 7000.

Why? It has to do with a quirk on the Z06. It's trans spacing is wide ratio. It needs good power at 4500 or you give up any gains you make at higher RPM's.

I did not post ET's above because it was not relevant when one car is launching harder. The BFG driver was actually running VERY quick for this track with his mods. The "fatty Z06" though was quite a bit quicker (0.5 seconds).

With good drivers, MPH vs Weight in the same body style, indicates how much average power the car is pushing down the track. Does the Z06 cam work as good as some bigger cams if you shift at 7000? Yep.

Food for thought.

SSactionLs1

last week i saw H/C zo6's run 13.1@114, and bolton fbodies trapping the same...

i NEVER judge a setup by someone elses driving...

McRat

He was no slouch, low 12's on DR's are VERY good at our track.

Same day, very similiar cars, similiar drivers. Even most "average" drivers get good MPH. Example, often when I race other people's cars, I don't get as good of MPH as they do (I weigh 300lb with a firejacket and helmet), but normally get much better ET's than they do. I'm a "local" at Carlsbad, and pretty much know how to get the car moving on slippery surfaces.

SScam68

iTrader: (20)

What are the rpm drops between gears?

McRat

The M12 drops to 4500 in EVERY gear when shifted at 7000. To use a "big" cam, you need to shift higher than you do in an Fbody.

foff667

iTrader: (2)

ive seen fbodies trap 118 with the stock cam shifting at lower rpms then that so IMO its not really a fair comparison...also the secret spec large cam thing is crap there are many people out there that have no clue what cam they are running in their car so to say its a secret spec could mean they are running a 220/220 er something and they wouldnt know the wiser...too little info, too many variables to be a valid test of any sort.

lata
Bill

McRat

No...

This cam had over 240 exh duration. It's a popular grind. Sounded BAD ***!!!

McRat

Usually I see the same thing in near stock A4 Fbodies and C5's. Big cam doesn't always make a car go quicker than a small cam. You pick the cam for the application, or to "fix" a problem you have.

I just thought it was an interesting comparison of similiar set-ups with the main difference being the cam. I'm willing to bet that if he shifted it higher, it would have went 122-123.

lsx24

iTrader: (45)

Real quandry but would it be able to safely live at 7200 per say? The ls6 springs and valves are real nimble wonder if that's a cooincidence.

kumar75150

drops to about 4900 in every gear with a stock Z06 and 7000rpm shifts according to my calculations

BTW, I pity the fool with stock 3.42s.

The Juggernaut

iTrader: (7)

N0, Z06's have a 3.42.

Big cams don't work. LOL

SPANKY LS1

iTrader: (24)

I once saw a nitrous Mustang go 13.30s. Nitrous sucks, cars are faster without nitrous.

Seriously, why the anti-big cam crusade?

Big cams work, period. Look at the Cartek cars and JRods cars. Both have "big" cams by your definition, yet both of them run extremely well, even with the Z06 transmission.

Shawn

BuckeyeROC

iTrader: (7)

You can't draw any conclusions based on what just 2 cars did. There's so many variables that come into play. One guy had the big cam, does he have valve float? Is it tuned properly? Does he have any other problems? Does he have all of the supporting mods needed to allow the cam to use it's true potential? The list goes on. Maybe the big cammed car was tuned perfectly and running well, but then you have to remember too that each motor and car is different. I've seen bone stock LS1's run high 12's and I've seen them run low 14's. Just WAY too many variables.

Bottomline, pick the cam that will work best for what you want and your goals and go with it. Remember too that it's all about the right combination of parts.

gator's 99TA

iTrader: (2)

just my .02 i have ALWAYS gained 2 mph on average assuming same weather/day when i bolt on slicks or et streets when compared to radials.

but i do agree with the powerband issue and where you make power. if you are on radials 4500 rpms is a huge issue. if on slicks, a MUCH less issue.

McRat i dont really understand how you can say the rpms drop to 4500 rpms every gear? i mean, the ratios obviously change from 1-4th.

CHRISPY

That comparision is totally useless.

The cars setups are completely different.

One weighs 200 pounds more than the other
One has ET Streets versus ET drags

AND their were two different drivers.

I personally think the Z06 that ran DR's would pickup 2-3 mph on ET Streets with an agressive launch. And at least 3 tenths. (Barring breakage)

McRat

OPPSS!!! My bad, the M12 drop is to 4500 when shifted at the factory redline. Shifting at 7000 moves it to 4800-4900. Must be getting senile.

McRat

My poor shifting affects my MPH, but seldom does the 60' times. Whether it is a 2.0 or a 1.6, the MPH seldom varies more than 1 mph on an otherwise clean pass. Maybe my car is different.

I keep hearing: Dyno's mean nothing. It's MPH at the track that is the true test of HP. Now I'm hearing that MPH is no longer a good indicator?

monodax

Well If you want to really see the indication of what a good cam is look at the thread here. These are taken from that thread: BTW, I don't see many Z06 cams on there lol.

Fastest CAM only cars

Naturally Aspirated - CAM-ONLY :..

Board ID - 1/4 ET @ MPH (60ft), Yr & Type of car, Trans, Converter/Clutch, Gear, Cam, DA, Race Weight, Date
01-Z ---------- 10.773@124.72 (1.49), 01 Z, TH400,TcT, 4.10, G5X2, +292, 3085, 4/04
Jason99ta------ 10.783@128.27 (1.56), 99 TA, M6, RAM, 4.56, TRex, +1300, 3253, 6/04
Coach02A3Z/28 10.917@122.97 (1.47), 02 Z, TH350, TK, 5.13, TRex, +2751, 3200, 6/04
MikeHoffpauir--- 10.989@121.44 (1.45), 00 Z, 4l60E,4400, 4.10, F4, -1700, 3300, 12/02
Smokin01ta --- 11.113@122.08 (1.48), 01 TA, M6, Spec, 4.56, TRex, +2500, 3475, 6/04
Streetstalkerz-- 11.26-@119.43 (1.51), 99 Z, 4l60E, 4400, 4.10, 232, +????, 3390, ??/??
PewterZ28------11.365@119.21 (1.55), 02 Z, 4L60E, PT4400, 4.10, C1, +70, 3300
XFiveliter------ 11.377@117.61 (1.54), 98 Z, 4l60E,4400, 3.42, 222, -460, 3300, 11/03
gator's99ta---- 11.598@116.91 (1.51), 99 TA, 4l60E,4000, 4.10, 230, -1200, 3590, 2/04
LS1Joe--------- 11.629@118.23 (1.64), 02 Z , M6, Spec4, 4.30, 224, +1300, 3525, 9/03
2MCHPWR------11.647@118.74 (1.64), 99Formula, m6,cartek, 4.10, B1, +700, 3500, 3/03
LoudmouthLs1-- 11.718@114.69 (1.59), 99 Z, TH400, 3500, 3.73, 228, +2500, 3450, 3/04
savageite------ 11.799@118.13 (1.64), 02 Z, M6, McCleod, 4.30, Tsp, +500, 3490, 10/03
Pewter'00z28--- 11.862@112.71 (1.68), 00 Z, 4l60E,3500, 3.23, 228, +3300, 3470, 03/03


https://ls1tech.com/forums/drag-racing-results/187330-fastest-cam-only-cars-list.html

SSactionLs1

mph is a great indicator of a few things
tuning
weather
track prep
shift speed
hp/weight

Hell i went gained 4mph in my times just from shifting faster vs "what i thought" was fast shifting..
Launch also can scew mph. When i was stock, my first pass was a 13.8@109 with something like a 2.4 60ft. Next run i get a 2.0 and run a 13.2@106.

Just sharing my experience. (but i believe more in a consistant dyno then i do a very unconsistant track/driver.

McRat

They don't allow vettes on that list. Otherwise there WOULD be Z06 cams on the list. Vettes are not considered LS1 family engines here. Since NOBODY is going to try and run a 3200lb Camaro with a Z06 cam, how would you ever know?

There are several Z06's running the Z06 Cam that would make that list at MORE than the Fbody weights. Ours is more than 3400lbs (Full weight, +rollbar/harness +heavy driver and ran 11.72, and it's certainly not the quickest.

One of the guys ran 11.3 w/stock engine in a Z06 on 3250 raceweight. Explain that. Magic HP? Or maybe that cam doesn't suck as much as you think.