I have an appointment for some dyno time on my sr20ve NX2000. I really know nothing about dynos and have only stood next to one a handful of times. My objective is to make sure I am running safely and extract as much power as I can with what I have. The adjustments I have to play with are timing, fuel pressure(afpr), and vvl switchover(MSD digital window). I did some searching for "how-to dyno" etc. but didn't come up with much. If there isn't a sticky, maybe there could be one made up with good solid info/advise on dyno time.

What is the ideal air/fuel ratio do I want to be at?

I have seen people do pulls in different gears. What gear should I be in?
What should my tire pressures be at? Any tricks?

I'm sure I will come up with more questions.

Any and all comments would greatly be appreciated, but please, only if you have 1st person experience or knowledge.

Thank you.

DJ,

I haven't dyno'ed as much as the others, but I did dyno my VE earlier this year. You might want to find out what type of dyno you will be one, as the dynos that attach to your hubs will take your tire pressures out of the equation.

When I did my runs, I believe we took 2 baseline runs and if you can measure your coolant temps so that removes one variable - meaning if one dyno run is 3 hp higher it could be b/c you let the car sit for 6 minutes while you went to the bathroom not b/c you tweaked your timing 1*. If you have access to a Consult (would work miss it? ;) ) you should be able to view the water temp to the degree.

The others can correct me if I'm wrong, but you will want to check your A/F ratio first and get that good; and then start tweaking your timing and switch points. If you can adjust your cams separatly, you will want to turn 1 off and kick the other one on real early - do that for the opposite way and overlay the graphs for your best power which should show you where to switch your cams.

I think I remember hearing: NA dyno in 3rd and turbo dyno in 4th. My dyno guy inputted the gear ratios for a "true" calculation, but I believe I was in 3rd.

Josh

The dyno is a Dyno Dynamics - eddy current dyno. http://www.perfengine.com/dynoinfo.htm
I'll let DJ use my NisDatascan, so he will be able to see 8 parameters at once.

Being a Dyno operator and testing over 100+ different cars this is my recommednation for you.

*your AFR's are recommended to be 12.5-13.5 for n/a and 11-11.5 for boosted cars.
*Once you dialed in your fuel correctly you'll want to start fooling with your timing.
*Pay attention, as mentioned previously, to your water and intake temperatures.
*Make sure that you check out your plugs whenever you see an increase in power being made. Also, bring in a set of fresh plugs with y
you as well.
*If its a Dynopack, you wont have to worry about the tire pressure, as previously stated. If its on a chassis dyno then you'll want to be
sure that your tires are at least 33psi so that it doesnt create any folding over when the car is submitted to a load.
*Check your coolant and oil levels before hopping on the dyno.
*you'll want to use the gearing that is closest to 1:1 ratio. this is regardless if its turbo or n/a.

The dyno is a Dyno Dynamics - eddy current dyno. http://www.perfengine.com/dynoinfo.htm
Terrific Dyno.:biggthump

Thanks guys, great information. I can't wait for the day.

good luck on the dyno DJ, i cant wait to see the graph!