Is it hard to convert from mass air to speed density? is it worth it ? I will be running a twin turbo 383 tpi any help is much appreciated thanks John

 

There is a tech article on this website that describes the process. And yes it is worth it. With the turbos you might want to consider the 7749 Syclone/Typhoon computer, as it knows how to compensate for boost. I think there is a tech article on that, too.

 

Definitely, speed density is superior to MAF. And I agree with the person above, get the good computer. A stocker even with a tune will never run right.

 

thanks guys

 

Guess that is why GM went back to MAF, to add an expensive part and run an inferior set up.

 

That is a pretty good point! If maf isn't as good as SD, then why would all of GM'S new hot rod's come with a maf.

 

so should I stick with a maf also would I be able to upgrade to an lt1/ ls1 maf?

 

In my experience it really doesn't make a differance which you use, MAF or SD. They both can be tuned to run well. It is all in the tuner's ability. No you can't upgrade to the LS style MAF without changing the ECM.

 

You are talking about running turbos. There are restrictions on the MAF system that you can overcome by running S/D. I have done the same conversion from the 165 MAF ecm to the 7749 S/D ecm. A few things are needed. You can buy a 7749 ecm on Ebay for around $50, the AUJP chip, Moates.net for the moates adapter, a 2 /3 bar map. And some basic electronic knowledge. I have almost everything you will need as far as paperwork. I can email you most of it if you wish. Maf Systems can handle small engine modifications, S/D can go mild or wild engine mods.

 

GM went to MAF *and* MAP setups in tandem in 1994 because the smog restrictions tightened up at that time, and the MAP system they had would not give them enough control over the emissions. Also, they switched to sequential-fire injectors, and the MAF system gave them better control over that. It is true that MAF in general is better than MAP. However, in the thirdgen world, the 90-92 MAP system is much better than the 85-89 MAF system. There are more tables to change and modify, and the MAF sensor itself is a restriction to power due to its 2.5" size. The LT1/LS1 MAFs are 3.5" in size, and you can use one, but it requires an expensive translator to make it talk to the thirdgen computer.

 

im overwhelmed