Quote:
Originally Posted by zbph10
I'm heading for my first ever Dyno run this Friday and was curious what (if anything) I should be prepared for.
I'm sure the guys at the Dyno shop will be able to interpret the results for me but I'm trying to get up to speed on what things Porsche (87 Motronic) specific I need to know and if there's anything I may need to adjust and run again?
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There are a few things that you can do to ensure that your dyno runs are not wasted. Have someone step on your gas pedal while you check that the throttle opens fully at the engine. Use a test light or meter to ensure that the full throttle microswitch is activating after about 3/4 of full throttle. I used to get a lot of dyno runs from guys that were faulty this way and you can tell with with low power output and an AFR curve of a part throttle map. Make sure the dyno you go to has the wideband O2 equipment for measuring AFR. For retuning, have the dyno operator make his full throttle run in third or fourth gear from 2000 to 6800 rpm so a full range AFR sampling can be obtained. If it's a Dynojet, bring a USB memory stick, or a floppy disk, and store the Dynojet run files onto it so you can review them at home on your computer or send them to your tuner. If you're going to do chip swaps, don't bolt the computer down to the floor, and leave the cover on loose. Make sure the two pin 10 California brown wires by the DME are disconnected.
Quote:
Originally Posted by KC911
Can Steve do any additional tweaking without accompanying a/f numbers? Not questioning, just mentioning (for Brian), and curious...
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You'd really need the AFR numbers in order to tweak a custom chip to your motor - like tuning a musical instrument, you need tools to tune. Otherwise, with an standard chip, you can only map the chips based on the average of collected samplings. Over time as more samplings are performed, the more tweaked the program gets to match the collected numerical average of a particular engine configuration to maximize power output. As a chip customer, short of a custom remap, you are welcome to free updates to the latest version, so feel free to contact me if you'd like to update your chip to the latest.