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This program is handy if you have the Dynojet files, in raw data:
http://www.dynojet.com/downloads.shtml
Things to remember at the Dyno:
http://www.dynojet.com/downloads.shtml
Things to remember at the Dyno:
posted by lost27
Just a thread to help people remember what to do at the dyno based of my experiences at the dyno and from talking with other MUCH more experienced people who have dynoed.
1. BRING FLOPPY DISKS TO GET THE DYNO FILES! (very important, you paid for the data it should be yours to keep)
2. Before you even go to the dyno MAKE SURE YOUR IGNITION COMPONANTS ARE GOOD! (theres no sense in wasting money on a dyno if your car is going to be missing or cant hold boost, to ensure that you make good numbers check your plugs, wires, cap, and rotor before you go)
3. ALWAYS dyno in 4th gear. (it is the closest to a 1:1 gear ratio)
4. Start all runs at the same RPM when trying to compare mods( starting a run at a lower RPM will usually make more torque and horsepower since the lower RPM puts more load on the engine and causes the turbo to spool sooner so the graph will be different than one that starts later)
5. Use the STD correction factor with the Runviewer program when trying to compare to other dyno sheets.
6. Pay attention to how much boost you are running and where you're making full boost.
7. Fans are your friend, see if you cant place at least one on the intercooler and one on the radiator. ( i also unplug the temp sensor in the engine bay to make my IC fan run all the time)
8. Monitor your Air Fuel ratio if you can, at least do it for one run, its always good to know how rich/lean you are running.
9. Be nice to they dyno operator; who knows, they may give you one or two more runs than you paid for.
Thats all I can think of off the top of my head, if anyone has anything else to add feel free to share. Be safe and have fun.
posted by lydon
First of all ice does, next to nothing on intakes. Intakes are made of aluminum for a reason...they disapate heat.
3.5 floppies are a must!
dyno numbers should be compared in SAE mod, not uncorrected!
Always tune with the fuel octane, you plan on driving on!
A/F #'s should be verified, prior to making any changes!
always bring a spare set of spark plugs.
Check all lines for vacuum leaks
Verify boost settings!
Allow 30 min cooling time before appointment!
allow 5 min warm-up time prior to baselining!
allow 10-15 minites between runs..after your first TWO baseline runs.
If performance tuning...verify fuel pressure...at idle....and under boost!
Fuel pressure under load should be BSFC + boost level.... if your level drops at peak boost ...you have a fuel supply/ delivery problem!
If I think of more things to check and verify i'll post!
posted by Dmitri
8. Monitor your Air Fuel ratio if you can, at least do it for one run, its always good to know how rich/lean you are running.
The place I went to (Troy's guy) has one person watching AF at all time. If it goes lean, they immediately shut down.
They also replace the stock O2 with a wideband unit (using an adapter place), instead of a stick in the exhaust.
posted by DavidV
Another item to add to the list of things to do at the dyno: Check for boost leaks! Use some soapy water in a sprayer bottle to check for leaks around places like the ICs pipes, BOV, intake piping, turbo, etc.
-- DavidV![]()
posted by David_NA->FI
I work at an AWD Dyno in Houston, Turbochargers.com, and we use the stick probe in the tail pipe, unless someone has their own wideband O2 sensor conneciton.
We usually do pulls in 3rd gear, but sometimes 4th if the gears are really close.
If someone runs 16 or so for more than 1000 rpms and continues to increase in the upper RPMs, 3K+, we shut them down immediately, just stop the rollers and make engine RPMS die down. I don't know about making a run every 10 to 15 minutes... we usually keep the car running if we are tuning an AFC, but if the client wants us to let the car cool we turn the car off and wait a while. Most ppl want hourly tuning, or tune until the HP increase is not that significant (max out). Best thing is to get hourly tuning.