Eric, I am a big believer in this method.

I also have a mate who has a dyno shop and he too tells me this is the method he prefers due to the inability of replicating the air flow the coolers and engine sees in a chassis dyno set up.

I have mostly road tunned my own vehicle.

 

I agree and I own a dynojet also - get it close on the dyno and make sure it is safe a/f ratio first. Not absolutely necessary just good idea. The dyno does stress the car less than the street and it is safer for your intial runs in a controlled environment. The wide band 02 samples at like 300 times a sec and you can abort a run quickly with less load on the car than running in 3rd or 4th onthe street with wind resisitance making the car work harder and increasing the chance of ping ping ping ...

Your car will make more boost on the street than on the dyno by a pound or a little more - another reason to add a little extra fuel on the dyno before going to the street, and a good reason to fine tune on the street.

It is very difficult to try to duplicate the effects of air onthe IC and engine temps in a dyno shop - in fact for repeatability reasons dynojet corp suggests not to try for base run comparisons.
Since each shop would have different air systems that could effect numbers.

 

i agree also, my car gets tuned on the dyno then we run it on the street with the wideband still installed. you will gt a much better tune this way rather than just dyno tuning it

 

I go along the same lines as the others with dyno/street tuning. I start out on the street getting the car to run halfway decent, maybe some minor timing changes and get the A/F within reason. Then I go to the dyno and dial in the timing for best boost response and power. Then it is back on the street to make a small change to the timing if necessary and finalize the A/F. If I am at a track I usually save a map for that specific track since I can run a little more timing at some of the flatter tracks (as in road courses).

I mainly test stuff on the dyno to see if something will work or if it will cause problems. I spend about 10% on the dyno and 90% on the street tuning.

 

My car was tuned entirely on the street after we loaded a close map. I would use a dyno as well, but the rotary shop with a dyno closed down.

 

Damn Street cars!!!!