So, let's hear what happens if you two run again....

 

The losses through the automatic transmission, four gears ratios versus six, and 150#s of weight are all contributing. I've run a friend of mine with an automatic and lots of mods - my car basically stock. He outruns me, but is always amazed at how close I stay. The manual transmission makes a bigger difference from a roll than some of ya'll are giving it credit for.

 

I really hope we bump into each other again.. He's going back to the US tomorrow or day after! He was back here from x-mas & new years..

 

If you put the passenger in his car instead of yours, you may win by 3-4 cars..

 

With the noticable power I gained after the tune I guess it would be even more than that even without a passanger in his car.. Moreover, with the current tune, I'm only running around 22 degrees of timing at WOT.. Increasing that would yeild more power but I've left that till the weekend once I get the wideband hooked.. Also, it's raining here today

 

If you didn't do the race on the street, why did you have your passenger on board? I think that's the main factor.

 

He wanted to film the race from inside the car on his phone.. I actually had 3 runs with the passanger out of the car... On all three runs the driver of the manual C6 said he mis-shifted but I did notice a bigger gap at the start of WOT.. Didn't get a chance to see whether that gap would increase or stay contant though..

 

Next time, replace the passenger guy with skinny girl weighing less than 115 lbs, you'll pull harder!

 

This thread proves that most races are won by driver skill, not HP. He's just a better driver than you. You have the tools to win, just practice.

 

there is only a 30 rwhp difference between your combo and his. additionally, you have an auto which robs even more power. add the passenger and no tune, im surprised you kept up with him

 

I put this cam in my 04 GTO...you will need a good tune. I bet your WOT AF ratios are WAAAAY off.

 

Lou and I tuned the GTO on LG's Dyno. He encouraged me to go as high as 30* I ended up around 25* in the heavy GTO.

 

There isn't much to practice when it comes to a rolling race at 50mph when you're behind the steering wheel of an automatic.. My shifts were perfect..

In the case of my race I'd say that if you weigh factors against each other driver skill 1%, car tune 99%..

 

I'm definately increasing the timing once the wideband is hooked.. I doubt I'll be able to get up to 30* with the 91 octane fuel here.. I'll keep my fingers crossed hoping I could go upto 26~27* without any knock though..

 

Exactly, that is the obvious answer you are losing 5-6% with an auto, he has headers and a 6 speed Z51. The Z51 manual is geared like a c5 Z06, so with that combo it doesn't surprise me at all that you could not leave him.

 

Therre isn't much driver skill involved in putting your foot to the floor when the AUTOMATIC transmission is doing the shifting for you, combine the fact that its a auto with the fact that the race was from a rolling start and drivers skill is non-existant.

Xctasy - a cam is only going to yield maybe half its potential without a tune, timing, AFR, and your VE tables have got to be way-off until you get a tune, also a intake manifold is necessary to take full-advantage of cam.

 

the 3.42 will help him a lot and on wich rmp you were when you satat the race and from wich gear coz that cam you can fell it from 3500 rpm.
and your cam is one of the best cams

 

Your biggest problems are: 1) tuning, 2) weight and possibly 3) gearing.

Allow me further elaboration, and this is totally my opinion. I have had my fair share of trial and errors:

1) Tuning: Whenever you introduce a cam into a motor you are essentially changing the manner on which the car will behave...the whole package is now altered. A good tuning however, will/can make all the pieces come together but only if you or whomever had carefully chosen all the pieces. I've seen many people add a cam into a car and go slower; they may sound mean as hell but run worth a damn. If all your parts were chosen properly for your set up...ie TB, heads, intake and so on, then a good tuning can yield 20 to 30 additional rear wheel horses or more!

2) If I recall correctly, the Z51 C6 is lighter than your Automatic C6. Taking that into consideration, the package of that Z51 is such that it works around it’s given components. In other words, the whole thing was designed to maximize and complement what’s there (suspension, braking and power band due to gearing). Your friend essentially improved the already decently stout stock set up by adding headers (better exhaust flow) and CAI (better breathing capabilities).

3) Gearing plays a huge role. Remember, he has 3.42 gears PLUS his trans is geared to totally take advantage of the giving powerband of the LS2 mill with stock heads and cam. Great trans gearing was one of the C5 Z06’s advantages over the C5 coupes, Verts and FRC's.

Your improvement of let's say 30 to 40 rear wheel HP from stock will roughly net you about 2 to 2.5 tenth AND possibly 1.5 to 2.0 mph gain in the 1/4 mile considering your current weight and choice of transmission. By the sound of your set up, I believe that you really need a properly stalled torque converter to take full advantage of the new cam. Remember, if everything being equal (traction/power and driver) automatics really has an advantage over sticks from a stand still. Your particular combo vs his from a rolling start is not a big advantage right now over his better geared rear end and trans, lighter chassis and possibly better tuned Vette. Now, once you get that bad boy tuned and do something about that converter, you will smoke him from any point (rolling or standing start).

Replacing gears is a good idea, but if I were you, I would do Converter before a rear gears. The cost of gears and a torque converter I believe is about the same. Torque converters are typically good for at least a 0.3 tenth in ET reduction and it will compliment your new cam a little better than the gears at this point. In fact, a converter will "wake up" that semi-sleeping beast!

Again, this is just my opinion and this is what I've seen work on automatic C5's, 5.0's, Fbody's and also GN's.

Thanks

 

So true, big Turbo on a GN and D5 converter = D-O-G

 

Waiting to decide upon heads before getting a FAST LSX intake manifold cuz I'd rather have that manifold port-matched to the heads.. I doubt that i'd be milling whatever heads I'm getting.. Thinking of 205's or 215's @ 64cc's.. Milling will raise DCR incrasing my odds with knock due to the 91 octane fuel used here..