SD vs MAF
03-27-2005, 07:19 PM
#2
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Join Date: Feb 2004
Posts: 4,800
Re: SD vs MAF
MAF reads incomming air flow and the pcm uses it to calculate fueling. Speed density is preprogrammed with tables telling the air flow based on MAP readings, as soon as you do any mods those tables begin to become less accurate and they are much harder to get tuned right than just telling the motor x amount of fuel for y amount of air. In really wild applications speed density can become more useful again because you do not need the potential restriction of the MAF, but the stock MAF is not a restriction till forced induction for most cars so by the time it is the car will be spending lots of time on the dyno anyway which will help with getting the speed density tuned well.
03-27-2005, 07:42 PM
#3
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Join Date: Mar 2005
Location: Ft. Huachuca, AZ
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Re: SD vs MAF
So if I plan on using forced induction SD can be better. Unless you have a properly tuned MAF. But what about if i want to use n20. Then what is better? Because I just bought a 93 Z28 and thought that it would have MAF. Because Fords stoped using it in 88 so what took CHEVY so long to get w/ the program. Anyway. I just want to know were I stand. And what direction to go w/ it. May it be forced induction, n2o, naturally aspirated. And if there is a way to convert it over if i need to.
03-27-2005, 08:16 PM
#4
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Join Date: Jun 2003
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Re: SD vs MAF
Come visit the speed density board we will set you straight... 
http://www.speeddensity.org/
Congrats on the purchase of your 93...you'll love it!!!
http://www.speeddensity.org/
Congrats on the purchase of your 93...you'll love it!!!
03-27-2005, 10:00 PM
#6
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Re: SD vs MAF
Chevy was using mass air till 1990, and then went to speed density b.c of problems with the mass air. They always went bad. 91,92 speed density cars were the fastest year of that gen. When fords were speed density they were faster too....dont no y everyone converts to mass air. I no people will debate me ...but in my opinion the 93z28 was the fastest lt1 they made. I know of ther people that have 93's too and im not alone on this.
03-27-2005, 10:16 PM
#7
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Join Date: Mar 2005
Location: Ft. Huachuca, AZ
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Re: SD vs MAF
Right on brother! Now that's what i'm talking about Over 200,000 mi on a LT1. It makes me feel a little better. Because i got mine w/ a 150,000 on it. I was a little worried. And thanx for the heads up. About the they did and then they didn't and they did again I was a little confused in that area. You know I might just keep the SD on it after all.
Last edited by Slayer63b; 03-27-2005 at 10:20 PM.
03-28-2005, 08:18 PM
#8
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Re: SD vs MAF
Originally Posted by 79TTCAMARO
Chevy was using mass air till 1990, and then went to speed density b.c of problems with the mass air. They always went bad. 91,92 speed density cars were the fastest year of that gen. When fords were speed density they were faster too....dont no y everyone converts to mass air.
03-28-2005, 10:45 PM
#9
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Join Date: Mar 2005
Posts: 89
Re: SD vs MAF
i just got a 93 Z28 M6 thats SD and it is very strong. gm used MAF in the vette and iroc-z TPI until 90, then they went to SD. the strongest of the TPI cars ive ever rode in are the speed density ones. and ive rode in a few MAF LT1's and this 93 speed density i just got seems like it pulls harder.
03-28-2005, 11:33 PM
#12
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Join Date: Jul 2001
Location: DeKalb, IL
Posts: 4,577
Re: SD vs MAF
Originally Posted by MEAN LT1
everybody wants a maf and for those that dont have them wish they had one. Who wants to burn chips anyway?. 
Speed density is cool and burning chips is not bad. I'll also probably continue running speed density on the car after I convert it to the new pcm and wiring. I kinda like it the way it is now so why complicate things?
03-29-2005, 12:05 AM
#13
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Join Date: Jun 2002
Location: UCF
Posts: 452
Re: SD vs MAF
I've been running in SD for the last 2 weeks with no problem. I will eventually plug the MAF back in, but I've been too busy or too lazy to plug it back in and tune. When I do, I'll have to mess around with the MAF tables since I had to mess with my VE tables to get my BLM's to 128 in SD.
Ryan
Ryan
