catchmes2000

Hi i am in a market for a cam for my 2007 z06

I am looking at the Katech torquer camshaft part # kat-4727 with high lift valve spring and titanium retainer clip. (0.615-/0.648-inch lift and 220/244 degree duration with a 110 degree lobe seperation should give 57hp according to:

http://www.vetteweb.com/tech/vemp_07...ion/index.html

Did anybody do this mod them self in there garage and is there a better cam out there that will produce more HP this one sim's to produce 496hp, 431lb-ft that is with full exhaust...

Please send me feed back and info on anything that you know before i atemp this mod.

PS: this is a everyday car so...

Thanks Jeff

Katech_Zach

Are there cams out there that will produce more peak power? Yes
Are there cams out there that will give a better balance of average torque and drivability? In my opinion, no.

Smok

I'm afraid there are no too many guys who personally experienced different cams. You rather can expect a bunch of answers, with everybody saying the cam installed in his car is the best...
If you're NOT going to build a track dedicated machine, look for torque all over the RPM range. Not for the peak torque at high RPMs..

VetteRobbie

I only track my car. I think the cam is great like anybody else who has a cam, theirs is the best. One thing I will tell you. Katech sells parts that work as advertised.

http://www.robs427.com/htmpages/Cams...tallation1.htm

PRE-Z06

I'd recommend also looking at Quality Motorsport's "Street Bully" QM550

Wanderer Z06

My car has been in the high 10's with this set up + headers on stock bald run flats. So I agree it''s got gobs of torque all through the curve and provides great all around daily driveability.

Good choice IMO

Coldmale

I put the Torquer cam in a few months back with the LG Pro headers

Results were very dissapointing as far as the numbers are concerned.

rwhp before was 473 at 6200, and after was 490 still at 6200, but was 15-20 up right across the graph

rwtq before was 441 at 5,000 and after was 470 at 4,000 and again was still 10 up at 7,000

So increases right across the scale but no big numbers. Timing limited by knock on pump gas

I have never got an answer as to why the actual number gains were so low on an engine that was giving good numbers on a tune only.

As far as driving goes - its great. Bags of poke but it does run out very quick after about 5500 and I am looking now at either a) a different way of timing the cam, or b) an alternative.

Good - but not great - and again I hav'nt found an alternative with a low LSA that might give me more up top without losing what I have low down

Katech_Zach

This is very abnormal. Even on our very conservative Mustang dyno we see a minimum of 500rwhp if the car has intake and exhaust. These are cars that baselined at 430rwhp on the same dyno. There has got to be something in the calibration, or like you said you're fighting knock retard.

wstaab

I have owned three C6 Z06's including my current one that I installed a Katech Torquer cam, springs, and retainers in. Every one produced 500+ ft/lbs of wheel torque. Torque (power) is what you feel. Displacement + compression ratio + airflow = torgue. HP (work over time) is a function of rpm and is just a mathematical formula. 10 liter turbocharged diesel engines produce 500 hp and 1800 ft/lbs of torgue at 1800 rpm
From 2500 to 6000 rpm the Katech torquer cam is hard to beat in a stock internals LS7 street engine. Reasonable idle and low speed manners. Needs a little work on the tune at idle and under 1800 rpm due to the overlap.
With a ported intake and throttle body and a good set of 1 7/8 inch headers the rush at 3500 rpm is hard to describe.
I have tried the QM600 and a custom grind Comp cam but the Katech Torquer is my favorite for a street/track day car.

Link to idle videos:
http://performanceproductsltd.com/Page2.html

Coldmale

Jason

I believe the max timing we have is 24deg and fuel is supposed to be 93. I am actually thinking of going to methanol to improve on this.

On the same dyno (Dynojet, SAE) with the same tuner, best z is 580rwhp and most run in the 530-560 mark with all sorts of N/A mods and of course at 580 the cam is very agressive. I believe many guys are using cams around 235/255 @ 110/111

One solution maybe:-

Do you sell a tune for this cam?. You can PM me on this as quite honestly I am about to change it for a "lethal"/"punisher" type profile, but I dont want to loose what I have up to 4500. Its the sharp fall off above 4500 thats the killer. tq at 7000 is just 340, rwhp 460

catchmes2000

Wow, thanks for all the info your car is sick looks awesome keep up the good work.

Jeff

wstaab

The tuning trick on the LS7 with a cam is AFR vs timing advance.
What AFR is your tuner using?
There is a fine line between leaner with less timing and richer with more timing. The only way to accurately find the right combination is with a load control dyno and tune for max torque using timing advance with the correct AFR.

Coldmale

AFR is exactly 13:1 from 3500 - 6000 gradully increasing to 12.5:1 at 7100 and air temp was 39deg C (Yes) and 15% Humidity

Here then is the real Mckoy


Taken from my "racelogic" data logger we find the following by accelerating (foot to the floor) from a 50Km/hr hairpin (see my avator)and down a 500m straight. In 2nd gear pulling from 2500rpm, long't acc'l peaks from 4400 - 5300 between 0.8 and 0.85g. Actual max is 0.886g at 97km/hr at 4,900rpm

Changing to 3rd at 140 (7000) peak g is 0.45g at 155 or 5600rpm, average is 0.425 dropping to 0.375

Changing to 4th at 186 (a tad early) peak g is 0.26 at 204km/hr or 5500

As you can see the cam is sh*t hot pulling from 2500 in 2nd, but in 3rd and 4th it just dosnt quite hit the mark

Katech_Zach

Sent PM

blkz

I can tell you there are cam's making better numbers but it would be hard to find a better user friendly cam .If you want to come out of the hole hard and not have to always be in the power band give Jason a call . It's hard to argue with the people who stand behind it .

1.8t

Jason, does katech ever plan to offer more of a cam selection for the LS7 aside from the torquer? There are those of us who just might want a bit more power(and some drive-ability tradeoff) but would also like to have the peace of mind knowing the cam was spintron tested with a particular set of springs and had no harmonic/valve control issues.

badtbon

I like the Torquer 116, which is their Torquer cam specs exactly, but set up on a 116 LSA.

Here is our last engine dyno. The LS7E85 motor is now running 13:1 cr with the LSXR 102 and WP 102 TB, Killer Bee. It produces 660 HP with tuning and two other mods not dynoed and is a pleasure to drive, with zero surging due in part to the lower overlap, and placement of the MAF sensor forward.



This is enough HP and torque to unload 2nd gear at half throttle at 70 mph during the summer. No streetable tire on the market today will hold this power.

Katech_Zach

In 2007 we went back to the drawing board looking for a better cam for our LS7 packages. The result; we went back to the torquer. Nothing offered a better balance of power, torque and drivability. It has stuck as our choice for a street cam ever since. You could step up to the World Challenge camshaft (which has excellent valvetrain dynamics by the way), but the drivability trade-offs are more than some can tolerate.

Coldmale

Badtbon - who is "our last engine"?

What is a Torquer 116? or how did you achieve 116 with a 110 cam?

Also - See amendemnt to post #13

AM.MSCL

Does anyone have a dyno graph of this cam with the basic bolt-ons? i.e. headers and CAI
I would like to see what the cam looks like through the whole power band; the above grape is getting a bit to crazy for what I would consider doing anytime soon.
thanks
Ray