0Brian@RPT

The latest project was a 443 ci LS7 in a 2006 Corvette. It came to RPT with a long list of mods including:

WCCH LS7 Heads
LG Full Exhaust
FAST 102mm Intake
NW 102 TB
Halltech CF112 AIS

The Z06 was experiencing some drivability issues and decided to replace the cam. Here is the before and after dyno sheet. At the end of the day, area under the curve is the deciding factor and not the peak numbers. I will say, the cam is much smaller and works better with the existing mods. The new cam gained as much as 70 ft-lbs down low and had a flat torque curve 4200-5300 rpm. On the street, this a beast and drives much better.

triblk6spd

Very nice Brian. Im sure you did an excellent job as usual. Keep up the good work AND wonderful customer service.

double06

What was it before and after on specs or at least a general idea was it a 25x / 260 x on a 110 and went to say a 23x / 25x on a 114. I guess my question is how much smaller is smaller?

Great numbers under 6000 rpm.

0Brian@RPT

Thanks Justin and this Z06 was a challenge. It turned out well and well worth the effort to get more from the 443.

double06....I believe the original cam was a QM600 and the new cam is way smaller...22x/23x. The LS7 does not need a big cam. I had a customer come in for tuning and he had a 2008 Corvette Z06. The cam that was installed was a 25x/26x and had head work. After I tuned it, it put down 610 rwhp and 509 ft-lbs. The torque was a lot lower and in that case, you are trading one thing for the other. With the stock LS7's with cam, 550+ on torque is achievable.

johnbell2

+70 ft-lbs @ ~2800 rpm... wow, that's got to be a lot more fun to drive. Probably gets better fuel economy now, too. Nice work, Brian!

Halltech

Brian, have you ever tested the WCCH heads vs stock on a cammed car?

Just wondering. I know that most of the time, they are done at the same time as other mods, which does not reveal any gain for just the heads.

Cozmo

Awesome work Brian.

I'll be back next year for more power.

ZO ZICK

Very nice

0Brian@RPT

Not sure the heads are a big gain. I have a customer with a 2006 C6Z that made 590 rwhp and 565 ft-lbs on the same cam with stock heads.

walhan_qtr

hmmm would really like to see some 1/4 times with those cars. 565ft-lbs on a stock head and stock compression and small cam!!!! I have never heard of that before.... have you verified those numbers on different dynos??

none the less Great work... and good numbers!!! actually IMPRESSIVE numbers....

whats the highest have you guys seen with a stock short block LS7?? I am just wondering.....

also am I reading this right. 2 Z06s same cam. one with head work and 16 more cubes and made 4wtq less than the stock LS7 with stock heads??? how was it under the curve???

0Brian@RPT

The highest if have seen on the stock short block is 610 rwhp and that was a big cam. The torque suffered and only made 509 ft-lbs. The C6Z that made 590 rwhp pulls a C5Z with heads, cam, headers (490 rwhp NA) with a 100 shot. So, that one is legit.

The 443 ci only increased the compression by a few tenths and the goal was drivability. Even with the QM600, it was barely over 600 rwhp and some Vettes respond to mods a little better than others.

I wil get the graph and the 443 ci had nice torque gains at various rpm's compared to the stock dispalcement LS7.

Halltech

Thanks, I suspected that to be the case. Our Z06 made 594/568 with a mild Katech Torquer cam on a 116LSA. Heads are bone stock along with everything else in the motor except the 13:1 pistons with oil squirters under the pistons. Of course all components are bulletproofed by Katech like the DLC wrist pins, bronze inserts in the small end of the rods, ARP studs everywhere, and better springs with Ti retainers. We run 7300 rpm redline.

With the ATI UD damper, we should be around 600/575 on our steady diet of E85, with the torque now a real problem with 2860 lbs and the bias at the front by several percentage points.

Personally, I like the lower overlap cams with high compression, since that puts the DCR at around 14:1 and E85 loves that heat.

Your builds are pretty impressive. The Halltech Super Bee CF112 makes it all come together.

0Brian@RPT

On a 427, the cam only made 557 rwhp and 524 ft-lbs using the stock LS7 intake manifold. Once the FAST 102, NW 102, FAST 50 lb Injectors, Hinson Mounts and a retune.....590rwhp and 556 ft-lbs.

Looks like I have a typo in an earlier post and listed 565 ft-lbs and it was supposed to be 556 ft-lbs.

walhan_qtr

Hey man I am sorry I didnt mean anything. I am REALLY carious about those dyno numbers. I am not trying to talk down about RPT or their work. This is the first time I see them post here (well just the past few days, they probably just became vendors here or something)

if you go back to my post the first thing I mentioned was track times as that will give you a better idea on the power that the car makes.

its just really weird how a 443cubic inch z06 with the same cam and head work makes 4wtq less than a STOCK heads and shortblock LS7. and also how a bigger cam with similar mods as yours only gained 10whp more and lost 53wtq. why did the guy go through the trouble of putting a bigger cam and suffer driveability when you can smoke him with your smaller cam z06 with same mods (assuming both drivers have similar skills!) and at the end yours drive better! this is how I think in my head right now.

thats all whats this is about. I dont really know you and I didnt know they were talking about your car so dont take it that way.

I just deleted my post and will delete all of them after you read it. I just want to clear it up. not trying to talk **** to anyone. I am the last guy that would want that. I am here to meet new friends and learn about corvettes. thats all

0Brian@RPT

The LS7/LS3 engines react much differently than the older catherdal port heads. These engines do not require a big cam as the intake runners are huge along with a huge valve. There is a point of overcamming a car. I did have a misprint and the stock displacement 427 only made 556 ft-lbs instead of 565 ft-lbs. The 443 ci makes more power/torque and it shows in the entire band. The numbers that are being used is peak, and that doesn't really mean much these days.

Like I stated earlier, big cams suffer in making torque with the valves open too long. The highest horsepower LS7 that I have seen on my dyno would get crushed by a LS7 that is milder.

I have installed these style cams in the LS3 and LS7 and have worked flawlessy. The last LS3 cam we installed in a 2012 Camaro SS made 480 rwhp with Intake and Headers.

Other things to consider is the valve train weight. If you use a heavier valves and stiffer springs, you lose torque.

walhan_qtr

Thanks to both of you. Again I am really sorry about all this. And believe me I don't mean anything with my posts. As I said I just want to learn and understand. Its really impressive how a cam only car can hit Close to 600whp and 550+wtq. Again nice work and hope to see some track numbers of those cars.

Thanks

0Brian@RPT

The FAST 102 and NW 102 made a large improvement. We are talking 30-35 rwhp on this set up.

walhan_qtr

hmmm another interesting idea. see a lot of people said the fast doesnt produce a lot of power. maybe 15-20whp and mostly under the curve. peak numbers are usually like 15whp. is this a ported Fast intake??

and as far as the NW102. they say its good for maybe 3whp. on my LS3 camaro I only gained 1-2whp (before and after on the same day) so I know that for a fact. throttle response was different thats for sure but as far as power goes it didnt get me much. but thats just me. I have it on my vette but I got it all at the same time so I dont know how much power we gained

Thanks

0Brian@RPT

Unported FAST 102 and using 50 lb injectors. The NW102 is straight out of the box. There have been many discussions on headers and what their effect is on a LS7. With this particular cam, headers are a huge improvement. When I mean huge, I mean as much as 50 ft-lbs in the mid band.

The morale of the story, many cams out there and some just out produce more than others and are designed for a specific applications. Many cams are will work in Gen III and Gen IV Engines. Obviously, they not optimized for either. When you have a properly designed camshaft, it takes in account proper valve events for peak cylinder pressures, intake characteristics for a particular engine.

Nate B

I have personally witnessed both of these Zs, they are nasty to say the least. Neal427z's car is no joke. I'm the one with the 02z H/C/I (made 490/446, also built by rpt) and a 100 shot. Neal pulled me steady on our last trip to the air strip. He even let me go first on one run just to see if he could catch me, and he did. The katech cams are monsters and Brian knows how to get all the power out of them.