SS125

iTrader: (1)

Corvetteforum.com had a meet tonight at Milan Dragway. There was approximately 45 cars there. Mostly Vettes. I had the only SS and there was another guy there with a TA. Tonight was going to be a big night as it was my first time out this year with the new h/c and n20. I was probably expecting too much but was pleased overall. Made 5 runs tonight. I tried the n20 once. Learned something very interesting. Track was slick on the nittos tonight so I was spinning a lot. So 60' times pretty much sucked. The run with the n2o was the best, but the n2o only kicked in in 4th gear. I later found out why. That was the 4th run. I decided to try it one more time. Go to purge and..........nothing, no white at all, pressure falling. Now I've only jumped on this thing with n2o maybe 5 times and really no full 1/4 mile runs. I found out that when the company here in the Detroit area (don'want to name the company, but you know who you are) who filled it, have a habit of filling it with little n2o and lots of air. NOTHING BUT AIR!!! So, with spinning tires, a slick track and no n2o, overall I think it was pretty decent runs. Here are the times.

R/T 60 ft. 1/8 ET 1/8 MPH 1/4 ET 1/4 MPH
.115, 2.073, 8.312, 89.25, 12.653, 113.06, N/A
.117, 1.982, 8.019, 90.73, 12.317, 115.74, N/A
.137, 2.208, 8.298, 88.61, 13.614, 81.52, Missed 4th gear
.265, 1.999, 8.075, 90.56, 12.221, 119.16, n2o hit in 4th gear
.387, 1.954, 8.086, 90.00, 12.415, 115.08, N/A

Next year will be different. I'll have n2o in the bottle and a set of slicks or et streets on the back. Overall though, I'm pretty happy. But I would have liked to see an 11.

imos-ss 01

I wouldn't be too happy about that.... If you knew that they have done this b/f....why did you get it fillled there? I would be pissd.......

SS125

iTrader: (1)

I didn't know they had done this before. When I was having problems getting n2o to purge, Chris from APE told me that this company is known to give a little bit of n2o and a lot of air when they fill the bottles.. This was the first time I ever used the n2o. I just had it installed a few weeks ago. I just know I won't ever get it refilled there.

1fastWS6

iTrader: (3)

Why don't you watch them fill it so you can see what it weighs before / after? You can't fill a bottle w/ 10# of air. As long as it weighs 10# or 15# more (depending on your bottle size) after, I don't see how they could screw you.

SS125

iTrader: (1)

Remember, I just had this n2o system put on about 3 weeks ago by AP Engineering. They were out of n2o and took it to this place to have it filled. I got the car from APE thinking it was full as I';m sure they did too. And according to Chris, they put in a little n2o and then alot of oxygen. When I roed in the car the first time with Chris, he kicked in the n2o in 4th gear. I felt it and thought cool. I didn't try it again until last weekend and with the cool weather here in Michigan, I just spun the tires so I really could not tell, but I did last night as I only felt it kick in in 4th gear as I was approaching the traps and apparently that was the bottom of whatever n2o was in the tank because afterwards, it would purge nothing but air.

Damage Inc.

iTrader: (7)

That's some shady s*&T. I don't see how they can still be in business with all of this going on?

Chris@AP-Engineering

iTrader: (-2)

Here's what happened, We took the bottle to a well known company here to get filled, they are also well know for shafting people when filling bottles. This is not due to them doing it on purpose most of the time but from having guy's fill the bottle that aren't really sure what they are doing. Also if they are not monitoring how low the nitrous amount is in their mother bottle you can also fill the bottle with air. We purged the nos bottle for a long time last night and all it was putting out was hot air, no nitrous!! You can fill the bottle incorrectly with air/nitrous mix and still get the weight very close. BTW, the bottle did weigh pretty close to the weight it should. That's why we never thought that it wasn't right. We generally always fill our own bottle at our shop. We were out and with the weather changing we normally don't refill our mother bottle this time of year, hence we had to out source the filling of the bottle.

860 Performance

iTrader: (1)

I am always seeing this comment when someone says that they get 10 lbs of air and no nitrous, or some mix. Please feel free to check my calcs. Its been a while sine I've done problems like this, but it looks right.

I have some free time today and figured out how much air weighs and how much of it (volume) at 1000psi would it take to get 10lbs of air.
Air at atm. pressure weighs 1.275kg/m^3. Air at 1000psi weighs (1000psi/14psi) * 1.275kg/m^3.
So, air at 1000psi =91kg/m^3 or .00398lbs/in^3
This means that 10 lbs or air @1000psi would consume- (10lbs/.00398lbs) 2512 cubic inches.
Assuming that the inside of a nitrous bottle is about 5.5" diameter. (7"O.D. minus a 3/4" wall thickness). The volume of the bottle is then (5.5/2)^2*pi= 23.75in^2 * (bottle height)
Then, a nitrous bottle would have to be 2512in^3/23.75in^2= 105" long or almost 9 feet long. To hold enough air at 1000psi to add up to 10 lbs.

Likewise, a standard 10 b bottle which only holds about 275in^3 can only possibly hold (.00398lbs/in^3*275)=1.09lbs of compressed air if there is no liquid nitrous in the tank.
Hope this helps.

SS125

iTrader: (1)

What?

Chingon

iTrader: (1)

Worm

iTrader: (2)

Worm

iTrader: (2)

Those are not bad #s NA for no traction. Hard to tell if +4mph is a good increase in one gear only hehe.

Slart

860,

Thanks for the tutorial! I didnt understand these calculations were as simple as they are. Thanks for explaining it!

Steve