3car

I've been reading a lot lately about all these high HP Z06's that are
naturally aspirated and it seems that it takes a rather large camshaft
with lots of valve timing overlap to create such a monster. Since there
are a lot of pro and con's over tuning and what is considered a ''good''
street package, i would think that emission regs and what not are the
limiting factor in the decision to extract this horsepower. Can you get
an honest 660 FWHP and still make the emissions tests.???? The
current state of the art cats (or lack of them)and ECM tuning seem to be at the end of volumetric efficiency. Can you get good HP with
the factory cats, still have the radical cam and heads and pass
with the emissions test???? How about the dreaded "service engine"
lights. I would like to get one of these ''hot rods'', just don't know which one to get., 660 hp or 600hp?

thanks
3-car

VETZILLA

660 to the crank is possible.

I am at 520 rwhp right now and with rule of thumb @ 15 % parasitic loss that would put me at 600 - 610 to the crank with just a cam. No headers, cats intact, stock exhaust and custom tuned. Dr. Phil who is more well known over in the forced induction C5 forum for building ridiculous power did the cam spec, install and tune for me. We discussed that I wanted the power in the mid to high rpm range and was not concerned about making significant gains down low which will assist in launching the car and getting the tires tires to stick. The cam I have is mildly noticeable exhaust note but effects daily driveabilty very little in all situations. Spin the engine up past about 3500rpm though and things start to happen.

IMO to make the 660 would take to much cam and impat the fun of driving these cars anywhere / anytime you want to. 520 to the tires is plenty for a daily driver.

If you want more and still want to have stock driveability get a TTi X turbo kit and go crazy.

I have a 9 sec ls7 based C5 with one of these kits and the car sounds and drives stock until your ready to let the monster out of the cage.

Good luck with whatever route you take these cars are without a doubt awsome and a blast to drive.


M

Frenchican

Excellent post.

SABER Racing

I have a 660 pkg from Lingenfelter it made 668hp on the engine stand dyno. I drive it when ever I can, 4000 miles since May 2008. I don't have "E" check in my state so I could not tell you about that. Call Tim @ Lingenfelter, Look @ 660 LPE videos on YouTube! Good luck!

Randy@RaginRacin

I don't think it takes a large camshaft to make that type of power. Our Lethal Cam is a fairly tame camshaft that is making big power. We have seen 545-560 rwhp with cam only. I run my Lethal with Cats and it seems fine to me, but we don't check emissions here. You would have a better chance at emissions with a cam like our Stalker.
Lethal Cam-230/248 113+3 13degrees overlap 550rwhp/.85= 647fwhp
Stalker Cam-224/244 115+4 4degrees overlap 530rwhp/.85= 623fwhp

ProgGod

I figure my car will be sold before emissions time

3car

saber racing,
do you have any problems with ''service engine'' lights??? there was mention on your post about the strong emissions from your LPE hot rod,
will the factory cats scrub a little better or will they kill the breathing?
(seems the extra horsepower is negated if you have to go thru the factory cats. i love the overlap cackle the GT 21 camshafts makes.)
have you heard the use of pure ethanol to help get the car thru
emissions? if i can get something like that to work than i will get the
660 hp version. look like yours pull the entire rpm band, when they
(lpe) says its a little radical for the street, do they mean you need
to run the car around town in 1st or 2nd?? kind of like the old 302ci
motors in the z-28's
600 ft pounds of torque... any torque steer in 1-3 gears??
did you get the excedy twin disc clutch?

thanks

3-car

ProgGod

You can use high flow cats instead of the stock ones for emissions reasons. the hardest part about passing emissions will be the overlap of the cam. However done right you should be able to pass emissions.

RC45

What power did your car post on a chassis dyno?

SABER Racing

I can't really give you any info on the cats because I don't know. I have never had any service engine lights come on. As far as in town I usually run 1st thru 3rd, it is happy at 2500-3000 rpm, it idles about 900-1100 rpm, I run with my ac on most of the time, it has never stalled when I pull up to a stop, I can run 65mph in 6th gear with no bucking, when I push in the clutch (excedy) it automatically dose a small rev up to about 1200 rpm (sweet sound ). It only smells at Idle and not inside the car. "I believe it is all about the package" PM me for more details.

Rocket Z06

I believe its possible.

I havent put my car on dyno since changing out heads, but we feel the car should put down around 620 rwhp.

novaz06

Love to hear more about this car. 730hp at the crank? N/A with pump gas that would have to be some kind of a record. What is it?

RC45

Quite a record.

It would be interesting to hear about the head, intake, throttlebody, CAI and cam used to achieve this number - and what the rw torque is.

Would love to see a dyno chart.

Rocket Z06

So you dont feel its possible to gain 200+ horsepower over stock with:

Cam
Ported Heads
Ported Throttle body
Ported Intake
Vararam CAI
Headers, xPipe, Cats, Exhaust
Tune
thermostat
Injectors

ProgGod

electric water pump, are dry sump, new plugs will help get you there..

Once it cools off here I'll have to dyno my car, I'll betcha I'll break 600rwhp no problem

J HEBERT

I have the 650+ fwhp, that's a big NO on passing smog, and u will not get 200hp over stock with the mods listed, even if u stroke it and use the best of everything. Consider ditching the stock intake for a kinsler and a cam a good bit bigger than mine (u won't be getting groceries) and u could see that +200 n/a

tigertank

j hebert what cam r u running?

J HEBERT

I was running my 242/256 but recently swapped it out for a 236/260 right after going to 441ci. The new grind still has 30deg overlap cause we just stole from the intake and gave to the exhaust in an effort to get the 800rwhp on the spray. It fell a little short, but has just over 800fwhp, put 735 to the wheels jetted down to 180 shot.

Both of my cams would tick off the Pope if he had to drive in traffic, it takes skill and attention, and u have to be hardcore. The most usable, friendly power u will get is with the LETHAL cam, to me, if 99% drivability is important, don't go bigger than that. Few things impress me, but the ZR1 and the lethal z cam both do

Rocket Z06

J Hebert I know that you have tons of knowledge when it comes to the Z. Shawn and them have produced right at 650 fwhp with cam, you dont feel heads would give another 50 horsepower totalling +/- 700 fwhp? I respect your input cause I know you have down every road possible with these cars.

jogar80

Have to agree with JHebert...not with just those mods.