Bad fill?
Bad fill? We had a dyno day today and I put the car up on the rollers to get it dyno'd.
Originally, my tuning passes a few months ago, the car made 574/612 with 950psi bottle pressure.
Today, it made 565rwhp, down 10 from last time. That was from the ridiculously high DA and correction factor today along with high heat. No worries, AFRs were fine.
2nd pass, car went REALLY fat on the dyno, 10.0. Made 523. I'm wondering if maybe it was due to a bad fill?
Both passes bottle pressure was over 1000psi
I still need to look at my plugs and see if they're fouling out. And no, I can't read these ones since I had to drive home after the dyno day (didn't have any tools on me.)
Thoughts? Opinions? I'm not the most experienced nitrous guy, but I'm learning.
Originally, my tuning passes a few months ago, the car made 574/612 with 950psi bottle pressure.
Today, it made 565rwhp, down 10 from last time. That was from the ridiculously high DA and correction factor today along with high heat. No worries, AFRs were fine.
2nd pass, car went REALLY fat on the dyno, 10.0. Made 523. I'm wondering if maybe it was due to a bad fill?
Both passes bottle pressure was over 1000psi
I still need to look at my plugs and see if they're fouling out. And no, I can't read these ones since I had to drive home after the dyno day (didn't have any tools on me.)
Thoughts? Opinions? I'm not the most experienced nitrous guy, but I'm learning.
10 Second Club
Joined: Nov 2002
Posts: 1,471
Likes: 3
From: Berkeley, California
When nitrous oxide pressure is above 1100 the nitrous is above it's critical temperature, the temperature above which it cannot be liquid. When only gas is flowing, a lower mass is flowing. This explains why you were so rich and probably also explains why power was down.
I would say either the bottle was low on you just got all air comming out. Was this a brand full bottle. Before I have my bottles refilled I alway try to empty it out or try to let out as much air as possible before I get a new fill.
It was a brand new fill. However, the shop that I've been going to seems to have bad fills quite often. My friends shop just got a fill station, so I'll be going to his shop from now on.
I didn't empty it all the way, but it was almost empty to begin with.
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8 Second Club
Joined: Aug 2007
Posts: 160
Likes: 0
From: Statham,Ga
I agree with GaryZ.......you were above the supercritical pressure and temp.
Your A/F went rich because you were flowing gas instead of liquid.
Keep the pressure below 1050 and the temp below 85* and you will reduce
your problems with "a bad Fill".
Your A/F went rich because you were flowing gas instead of liquid.
Keep the pressure below 1050 and the temp below 85* and you will reduce
your problems with "a bad Fill".
Last edited by magnum-gto; Aug 15, 2010 at 06:08 AM.
8 Second Club
Joined: Aug 2007
Posts: 160
Likes: 0
From: Statham,Ga
