02*C5

iTrader: (1)

So the guy who is doing the work on my C5 said to me that he did not do a dyno tune, he did a street tune. The Dyno to him was just a tool for accuracy, and that dyno tuning was a waste of time to him, because the Dyno is not the street. What say you?

redtail2426

iTrader: (10)

you want to tune a car in the most practical driving situation.The best thing is a street tune,this is where the engine will be operating,you will get real iat temps,and just more accuracy.So go for it,unless you go for drives in your car while its on a dyno.The dyno is good for dialing in the wot fuel and timing,but if you have a wideband on board,then the only need for a dyno is the timing at wot.hope this helps.

Golf&GM

iTrader: (22)

True statement.

Wrong. Dyno tuning helps to see if the changes in WOT fueling and spark affect horsepower. If he's aiming for a set AFR with a wideband O2 his street tune is going to hit that AFR. But without a dyno there is no way to determine if your car likes a slightly richer or leaner AFR, a little more advance or a little timing retard. If he's good he's probably got it pretty close, but there is probably a little more to be had from some finishing touches on the dyno.

12secSS

iTrader: (30)

Absolutely correct! The dyno will tell you what AFR and Timing setup works best for each application. Taking it on the street to ensure you hit that optimized point is the best. I usually see about a 10 HP difference when I finalize the street tune on a dyno.

JonCR96Z

iTrader: (33)

Dyno will tell you what timing works best on the dyno, that's not always the same as what is the best on the street under bigger load. Now if you're talking about steady state dyno tuning with a EC brake than that's a different story. That's really hard to beat.

It's also hard to beat tuning where you are gonna be using the car. If you plan on racing it at a dragstrip, then tune it there. Inertia dynos don't tell the whole story, unless it's just a dyno queen.

jmilz28

iTrader: (13)

So noob summary (geared to me):
Dyno tune for WOT
Street tune for part throttle/driveability (99.9+%)

The street time like Pat G, Vengeance, Mike at Icon, and others do is how they get awesome drivability with big cams. There's no replacement for that time in those cases. Do both if you can.

JonCR96Z

iTrader: (33)

1. Correct airflow model (MAF/VE) on the street for all areas. Possibly play with timing to find the outer limits.

2. Perfect PE on the dyno. Tweak timing.

3. Log and tweak again at the track, to make sure the dyno adjustments agree with real life.

Slowhawk

iTrader: (12)

I agree with JohnCR. Just because the car makes the most "dyno" hp never/ever means it will be the fastest that way.In the past I use to tune all street/race cars on the street and they ran the fastest at the track that way.Now due to not wanting to get a ticket I use the load dyno for WOT but the cars still get a full street tune first.

allngn_c5

iTrader: (3)

Thanks for posting a qualified statement. You got the credentials.

BlkBird2000

iTrader: (10)

Me and my tuner drive around for a good 15 minutes so he can get everything right as far as daily driving it. We went up hills at 35mph in 5th gear and such.

Detoxx03

iTrader: (14)

Allan does both with my car for the best overall performance and driveability

AZNastyz06

iTrader: (2)

the tuner here does both for my c5!

Devin@Vengeance

Depending on what you have done to your ride, for high HP applications its recommended to do both. Some stock cars probably wont see the dyno, but again, it all varies. We usually always do both on all our cars.

Frost

iTrader: (45)

Both here too, and if you can only go one way, I go with the street! If I had MY OWN way, you guys would all have to have track rentals