Ran my Z06 in the Corvette Challenge, also ran Viper

[rbartick]

The air seemed really bad last night and the MPH on all of my runs was about 3 MPH slower than what I did two weeks ago. It rained in the morning and the air felt like soup in the afternoon. I think a TAG weather station said that the DA was about 1800 feet. My car seemed down on power due to the weather. Others said their cars were off as well. Here is my last run where I broke out and lost. I am in the right lane.




A bunch of us got tired of watching my brother run some really bad times in his GTS Viper so I took the car down the track. This was my first time dragging this car and I took it fairly easy. I am in the right lane, the car in the left is a VW GTI



No doubt that the Viper is making a lot more power than my Z06.

so is the VW?

Spraying?

[brent EB02]

hey rbartick...........i was there as well i have the electron blue with the ccw wheels with the blue cartek name on the back window...........

how far off were you et wise???

my et's were 11.20,11.21,11.26 @ 122 mph

im wondering about your et's so i can get a better idea where i would be with better air.....

yes it was very thick !!!!! it felt like it was going to rain any minute.....DA was +1800

i was talking to others and 3-4 tenths was what some were saying....

thanks for you imput.... brent

[WA 2 FST]

Wow the stock Viper ran 118 and your Z ran 109? That _is_ a big difference.

[McRat]

Your car is running like mine. 110mph'ish. This is showing a big drop in HP, IMO. 350rwhp in a 3300 raceweight is about 115 mph.

I'm reseaching the issue with my car. Apparently there is something not quite right with the factory programming.

[Greg Irvine]

McRat, where were you running 110ish...Fontana or Carlsbad recently.

Greg

[McRat]

Carlsbad, today. My car put out less HP than a stock engined LS1.

I was surprised at how slow the MPH's were. MPH shows HP.

[rbartick]

Brent, I am familiar with your car. My E.Ts. were about the same as 2 weeks ago, but my traps were down by about 3 MPH. This was my second time out with the car and I am getting better at shifting and launching it, but the power was not as good as two weeks ago.

Les, The Viper is not bone stock. It has some minor bolt-ons which include K&N drop-in filters, new air bridges, and a Corsa exhaust. I do not consider these significant mods, but I wanted to mention them. I never dragged the car when it was bone stock, but my brother did. From what I saw I would not say that his mods really made the car turn better times. My Z06 is bone stock


McRat, there is nothing wrong with my car. It recently dynoed at 355 SAE RWHP. Two weeks ago I trapped at 112 my first time out with the car in bad weather conditions. Stock LS1 C5s were trapping at about 106 on that day. This week the air was worse and my car went slower.

[MSiska]

One of the EBZ06's there ran a 11.994@112. 1.7 60' (he's a friend of mine). I ran a 12.78@110 with a 1.9 60'. Was the low mph due to the almost 90-100% humidity? Usually a 11.99 is about 117-118mph...was etown slow sat?...

[Speedracer]

The weather sucked... I couldn't manage better than a 12.5 with drag radials. most of my runs were in the high 12's.

[McRat]

Originally posted by rbartick
...
McRat, there is nothing wrong with my car. It recently dynoed at 355 SAE RWHP. Two weeks ago I trapped at 112 my first time out with the car in bad weather conditions. Stock LS1 C5s were trapping at about 106 on that day. This week the air was worse and my car went slower.

I don't think anything is wrong with the car. Mine did the same. I think the engines are pulling timing out of proportion to what is really needed. 110mph in a 3300lb vehicle is only about 310rwhp.

Air temp and humidity make a difference, but I haven't seen as big a difference on other cars as the LS6 cars. 5-7mph at the same track from 70 to 90 deg? That's a bunch. A LS1 might lose 2-3 mph.

I could be wrong. I'll find out. But something seems odd.

[McRat]

One thing to clarify about the power loss...

At our track a paper plate Viper ran 118mph same day. That's about 80rwhp. He only ran 12.9-13.1. LS1's ran within 1-2mph of their bests.