Im seeing people saying " bolt on 08s make the same rwhp as stock z06s"....
but i see them making 380-390 rwhp stock. are they reallypicking up 40-60 rwhp from bolt ons? do any members have modded 08s? how do the bolt on 06s fair straight line wise VS bolt on c5 z06s?

 

There are "dyno numbers" and then there are track results. Now its going to be up to you whether or not you believe that a bolt on C6, whatever the model year, can make as much power as a stock Z06.

A common, yet erroneous practice, is to take numbers obtained from off of a chassis dyno, and attempt to "back calculate" flywheel horsepower, using "driveline percentage losses" of 15% for manuals and 20% for automatics or thereabouts.

Such a practice has never been shown to accurately indicate flywheel horsepower.

Dynos are for tuning purposes.

With the new Society of Automotive Engineers Certified ratings, all factory stock LS3 based '08s make 430-436hp plus or minus one percent, at the crank.

All factory stock LS7 based C6 Z06s make 505 hp, plus or minus one percent at the crank.

Thats regardless to what anyone's chassis dyno shows.

So if someone tells you that they went from 430 or 436 crank horsepower, all the way up to 505 crank horsepower, some 70-75 flywheel horsepower, with nothing but bolt ons, well, thats going to be up to you as to whether or not you believe that.

But you will see a wide degree of variability in chassis dyno numbers. Stock Z06s have shown 445-460 RWHP, on a chassis dyno. However that variability is more in the chassis dyno than anything else.

Why? Because all LS7s make 505 hp at the crank, plus or minus 1 percent.

Quite worthy of mention is that the quickest bolt ons only C6 is an LS2 based automatic owned by DennisNJ.

That car runs 11.1 seconds in the quarter mile, bolt ons only, and does not make the RWHP of a lot of stock Z06s.

So I wouldn't get too hung up on chassis dyno numbers.

The second part of your questions centered around "straight line" performance.

Right here on this site, here are three well respected, well maintained, data bases of straight line performance, both stock and in various stages of modification, of the '05-'08 C6, the C5 Z06, and the C6 Z06.

The straight line performance results of stock and modified '05-'08 C6s can be found Here

The straight line performance results of stock and modified C6 Z06s can be found Here

The straight line performance results of stock and modified C5 Z06s can be found Here

This data is as complete as any that you will find, and is real world data as opposed to "magazine" data. Hope this helps in answering your questions.

 

Now thats what i call an answer.

 

Yup, a no BS seemingly accurate answer!! Sometimes the internet really is credible. Nicely done.

 

looking at the stock z06.. im assuming that since several people ran 10s bone stock they are decent drivers.. why such a huge disparity in mph? going from 121 to 128.. in most cases, that amount of mph is by virtue of a large HP difference.
here is my reason for asking. I am looking in the near future to purchase a Vette. the c6 z06 is out of my price range. I want a weekend warrior.. something i can put my foot down in on the freeway and do a little spirited driving. I prefer the looks of the C5 Z06 FRC style over the C6 coupe. but i also like the c6 coupe enough to purchase it if its " that much faster' then the c5 z0 out the box, but it just seems for ever claim i see, i see one going the opposite way.

Im not trying to stir the pot, just trying to get as much data and owner opinion before i make a purchase.

 

My car got mopped up by a bolt on Z06 the other day, wasnt even close.

Probably going to need more than just bolt ons on an LS3 to get the 440-460whp of a Z.

 

Its not too long ago when i was in the same boat as you . What i would say is if you buy LS2 you could save alot of money and use that money for mods(Make it your own way), or go with the LS3 and pay more. Not that the LS3 isn`t worlth it, because it is. Believe me if i had the $$$$, i would have gone with the C6 ZO6 in a heartbeat . The LS3 responds better to any mods that you put on it as compared to the LS2. But the LS2 is still a record holding platform. I can`t comment on the C5 ZO6, but i was also thinking of purchasing one before the C6. You have a tough choice ahead of you, and all i can say is you really can`t go wrong because you will still get a Corvette.

 

it is a tough choice. with the c5 z06.. i save alot of money over the c6, money that could go into building a monster..

has anyone done a heads/cam ls3? what are the differences between that ls2 and ls3 short block? or is the diff in the heads? IE can you bolt on ls3 heads to an ls2 in the same way you could ls6 to ls1?

 

That is true too(Saving alot of money with a C5ZO6).
Yes people have already done the head swap on the LS2`s with the LS3 heads, its called the L92/L76 combo. Evilways netted great results at the track with this combo. Look at the 1/4 thread in the C6 H/C section.

 

But not in all cases. When you point to the numbers 121 mph vs 128 mph, I am assuming that you are referring to numbers found on This List?

Just from gathering as much information as is available both here and in the drag racing section of this forum, it turns out that there could be a number or reasons for differences in trap speed. Even in the same car. Driver technique, tire spin in between shifts, fuel load, density altitude variation, even on the same track at different times of the day,.... all apparently can affect trap speed. Some even say that accelerating until the entire car makes it through the traps can affect trap speed.

Although horsepower difference is frequently pointed to as the cause of difference in trap speed, the list of possible reasons for differences in trap speed apparently can go well beyond just "horsepower difference".

But the point is that it is a very safe bet, that the reason why car #13 in that list ran 121.4mph and car #1 on that list ran 128.9 mph, is NOT due to a (factory) horsepower difference. Both those cars have an SAE Certified 505 horsepower at the crank.

Meaning that when they were built, their LS7 engines BOTH make 505 horsepower at the crank, plus or minus 1%. If they are stock, then their engines are both making about the same power. The driver who ran the 128.9 in his own car, may very well have run the same, or similar 128.9 mph trap speed had he been behind the wheel of the car which has the 121.4 mph trap speed.


Well, just one man's opinion, but I think you have to ask yourself: "How fast do I want to go?" And then work from there based on which car's body style you like, how much you want to spend and what plans you have in how you are going to use the car.

Good luck.

 

I need a bigger cam vs a bone stock Z. I feel that then I would get them.I was going for gears,but now think a cam is the better choice.

 

There is a bolt ons C6 Z06 running the quarter mile in your area, which is Sacramento Raceway I believe?

What kind of numbers did it put up? PM me if you have to to avoid "hijacking" this guy's thread.

 

I have Headers, Cam, VR intake, and ported mani and I have 495 RWHP on my LS3 (On a hot, humid, south Florida day). The car pulls like crazy and I have zero traction. I don't think heads are really worth it on the LS3... it's got very good heads from the factory. Of course being that the LS3 is pretty new, we haven't seen much headwork done to them yet.

 

i dont consider your post hijacking. im looking for real world experience.. the last time i messed with ls1s was back in 00/01.. in 00 i had a heads/cam/00 TA, and was one of the first to have a ls6 intaked installed on an ls1, but my last car was a 98 supra TT that put down 442/490 with bolt ons. Before i bought it i wanted a c5 z06, and now that i sold it i want to get one, but with all the new wonders of the c6 its a tough choice of sticking to my guns or getting the newer car... since c5 z06s are now in the low 20s. its always an option of getting one and dling a forged 8.5:1 ls2 with a blower

What ever i buy will remain bolt on or at most heads/cam or low boost Blower till i can afford a motor build up.

 

has anyone dropped a Centrifugal blower on an ls3 yet? how do they react VS the ls6 or ls2? what seems to be the highest hp the stock bottom end can take ?

 

Yeah, but you never can tell, the mods might.

Well good luck.

I don't think you can go wrong with either the LS6 based C5 Z06, the LS2 based C6 or the LS3 based C6.

They can all be made to run high, to mid to low 11s with just bolt ons, so you have a lot of choices available to you. All of them good.

 

Not only a complete answer, this should be made an "educational" sticky, imo.

 

Wow, thanks everybody for the very kind words.

 

all the info is in their its great

 

Once again 06quicksilver Z06 is right on the money You can always count on him to provide an accurate & complete answer

In fact I am going to borrow some of it for "the list"

Thanks

Tommy