tune

[bangbangskeetskeet]

yeah that makes sense.
live tune is best for everyday, mail order is good, speed density is good for racing.
now how can i get a live tune from nelson if im in az???

[GasGuzzler]

Take a long vacation.

You also always wanna call and set an appointment first for a live tune no matter who you get to do it. A waiter out of the blue for something so intricate and important doesn't make most people very happy.

My mail order is just fine but it's also getting changed soon I think to get a little more out of it.

[RedHeartbeat]

FWIW, speed density tuning is not for racing only. GM used to speed density tune the Corvettes and Camaros. My 93 Corvette LT1 engine was speed density tuned from the factory, no MAF sensor in the airstream, and ran like a bat out of hell. The engine is still running strong in my buddy's truck out in Greenville with the same exact tune I ran in it starting back in 1995 and it hasn't had to be retuned since.

[sprayedenali]

what are the advantages of speed density?

[GasGuzzler]

I just meant on anything current since no OEM to my knowledge has used SD for a while. F*** converted the 5.0 in 1987.

If it has a MAF, it's not SD.

[Sleaper]

I'm speed density tuned and use my truck as my DD. It all comes back to the tuner. To answer your question, typically a SD tune is used when you have some sort of forced induction (but can be for N/A vehicles as well) and you use a 2 or 3 bar MAP sensor that will add fuel based upon the amount of boost pressure. At some point your MAF sensor will reach its limit on how much air is passing through it. Tuners can still tune using a MAF that is over its limit, but you can dial in a little better with a SD tune. As far as daily driving with one, it comes back to how good your tuner did setting it up. I had Nelson do mine and it feels smoother than it did with the MAF tune.

A live tune is definitely best, but if you can make it there for a while, get a mail order in the mean time.

[ducky]

I'm speed density tuned and use my truck as my DD. It all comes back to the tuner. To answer your question, typically a SD tune is used when you have some sort of forced induction (but can be for N/A vehicles as well) and you use a 2 or 3 bar MAP sensor that will add fuel based upon the amount of boost pressure. At some point your MAF sensor will reach its limit on how much air is passing through it. Tuners can still tune using a MAF that is over its limit, but you can dial in a little better with a SD tune. As far as daily driving with one, it comes back to how good your tuner did setting it up. I had Nelson do mine and it feels smoother than it did with the MAF tune.

A live tune is definitely best, but if you can make it there for a while, get a mail order in the mean time.

ive got speed density on mine and its just like ramair said. Its a little easier to figure out exactly how much air and fuel to add, timing, etc.

[bangbangskeetskeet]

right on. so is the speed density something i will have to take a vacation for? is there any difference in the prices of a live vs. speed density tune?? what about the difference with either and the mail order? who would you say is the best for sd tunes?

[RedHeartbeat]

A local tuner is best for SD tuning. Most shops that do Fbody performance tunes can SD tune a truck.

[ChevyLee]

Mine is a 89 tune, allen tuned it up, said he got more timing from 89 then 93 but thats just me. Just get a nice live tune an let the tuner decide what is best.