Last month some local St Louis Corvette buddies booked some dyno time at Mustang Muscle (one of the most trusted dyno's in the St Louis area) so myself and a buddy with a new Z06 who just installed some Kook's headers and had a new ECM tune done by Jim Hall jumped at the chance to get some base line numbers.

Here's my buddies Z06

I let him go in front of me to "warm up" the dyno. It's not my place to share his numbers so I won't but it gave me a pretty good idea of how accurate this dyno is. VERY accurate.

Last but not least I strapped on my 06 6-speed:


I'd like to mention two items:
1. My car just turned 1600 miles
2. I installed the B&B Rte 66 cat back exhaust

Some history. I and many of my buddies have used this dyno since 2001 when I did some before/after tests on my 99 6-speed coupe and my 03 Z06. Last Aug I wanted to see what a Blackwing added. Here's some numbers to put things in perspective:

My 6-speed 99 bone stock laid down 292 RWHP. After installing a Blackwing, Corsa Indy's and FLP LT headers it increased to 325 RWHP. Not bad for about a $3k investment.

My 03 Z laid down 354 RWHP bone stock at 4900 miles and 367 after a Blackwing, B&B PRT's and a Bassani X-pipe. So armed with this info and data I've collected from other new C6 owner reports I was hoping to see at least 35X with the B&B exhaust. I didn't. Here's the data:


This seems to explain why my 03 Z always felt faster. So today I installed the HalltechSSM air intake assenbly. The install was a breeze:


I'll put about 500 mils on the car and re-dyno it just to see what if any additional ponies I left in the barn.

I have another intake that caused surging and a few CEL which I removed and returned to the vendor. I decided on the Halltech based on conversations I had with Jim Hall and a few buddies that have installed the Stinger. So far no surging or CEL's.

I figure it'll take me about 3 weeks to roll up 500 miles so stay tuned for the next dyno test.

Tom

 

I made exactly 2 rwhp with the same cai. I installed it on the dyno did a pull then took it off so show it was not a cool down issue. But, if it doesn't throw codes and feels better congrats!

 

which intake gave you a cel?

 

I installed the same CAI and saw a immediate jump of 12rwhp.

 

Your '03 Z06 will dyno about 3% higher than your C6 because it uses an 18 inch rear tire vs the 19 in tire on your C6.

 

wait till you get over 3k on the motor, it's tight as a bitch till then and will give louzy numbers. My before and after gave about 10rwhp and also the area under the torque curve is better with the C6 but not peak.

 

I bought my 05 C6 Z51 with 2700 miles. It seemed much slower compared to my 02 Z06. But now I have 6000 miles and it feels like another 10-15hp. Although, no before and after dyno runs.

 

After tuning a friend's C6 today, I hooked up the TECH 2 to view a few of the parameters.

This car has the Halltech C6 Stinger ICAI System, headers, and cat backs.

The Outside Air Temperature was 78 degrees for most of the 30 mile LTF trim relearn drive, and interestingly, the Intake Air Temp was only 2 to 4 degrees hotter (80-82 degrees) than the outside air temp, even when stopping for stop lights.

I'll try to get a screen capture of this parameter for posting here.

 

If this is true we should all run little tiny wheel/tire combos.

 

Have you looked at race car wheel/tire combos? Most run less wheel and more tire than the ghetto bling big wheel wrapped with a little rubber band look that is unfortunately currently popular among the all show no go set. There are very good performance reasons they do so.

 

One point I was trying to make that I guess I missed the mark is I don't believe the B&B exhaust is worth anything in terms of HP gains. If I made 347 with the exhaust and the exhaust actually made some extrta ponies then my RWHP (minus the exhaust gains) would have been lower. Let's say the B&B's are worth 7 HP. That would mean my car's baseline was 340RWHP. That's seems low to me.

The second point I was trying to make was the fit and finish of the Halltech intake and the ease of installation. In my time behind the wheel so far (about 50 miles) the car (and throttle) really perked up. The throttle response seems sharper now.


Tom

 

Thanks. Could not have said it better.

 

Good points to ponder. But it makes one wonder why Chevy choose styling over performance?

Tom

 

Since the general population is skewed towards bigger wheels/less sidewall, GM would in a strange position trying to sell a Corvette with a small wheel and a early 70s era style sidewall. It should also be said that wheel diameter grew over several years as braking systems grew on street vehicles. Now, wheels have grown several inches beyond even what the performance brake systems need, but that is what the buying public is looking at.

Todd

 

The C5 Z06 had it right, 17's front 18's rear. The Italian made wheels are feather light, the fronts tipped the scales at a scant 16lbs vs 20.8 lbs for the current C6. I believe these sizes would be accepted in today's market.

 

 

You've completely missed my point. The person I was responding to implied the C5 would dyno with greater torque simply because the overall wheel and tire diameter was smaller. Read his post.

 

Halltech says the new filter is worth 2 inches of water less pressure drop. By my calculations that comes out to around 1.7 hp more and according to Halltech/Donaldson, that is worth 2.5 hp. So your number looks believable to me. I highly suspect the 10 hp numbers everyone is throwing around for the Halltech/K&N/Blackwing type of inlets. I put on a K&N and unfortunately didn't have time to do a baseline without it, but I made 334 with the K&N for a stock A6 which sounds like the K&N was not worth very much.

 

you should take your own advise...that person never say anything about "greater torque"...following is the exact quote incase you need some help.

"
Your '03 Z06 will dyno about 3% higher than your C6 because it uses an 18 inch rear tire vs the 19 in tire on your C6."

 

I can see the 18's giving the car slightly more power due to a lower rotating mass, but certainly not 3%. The loss will be higher in 1st gear, but most people dyno in 4th, so the loss will be very low. Please explain your 3% number. I want to make sure I'm not missing something.

Thanks,
Glenn