4aFriend

My friend has a 87 Mustang GT with T Tops. He recently purchased an engine dyno'd at 375 hp. He says he has to do a mass air conversion because speed density runs off a graph, and when you change paramaters of the engine, it won't run properly. My question is, why can't you get a chip burned for the car to "see" the new mods therefore not having to go to mass air conversion. The new chip would change the speed density "graph" wouldn't it?

91GT5.0

You can, but you will have to reburn the chip everytime you do a major mod unless you do all mods at once. It's just easier to go mass air.

spike306

agreed

4aFriend

If all the mods were done at once, which is more cost efficient?

91GT5.0

depends. I've never had to do the swap, so I don't know what's involved or how much it costs. Depending on the chip, you can get them burned for around $300-$400. I'm not positive on this though, as I've never gotten a chip burned either. Though speed density has leess restriction for the incoming air than a mass air does (mass air meter disrupts flow). That's why you'll notice for the most part, stock vs. stock, S/D cars are faster than MAM cars.

4aFriend

That's what I was thinking. I knew SD cars were faster, well, I think the 93 had the highest hp output, didn't it? Anyways, the reason behind my thinking was on my car (89 Corvette), I had to redo the chip after a bunch of mods, and I asked him about redoing the chip for his car. He said he didn't have to , the mass air will set everything straight. I told him , my car is mass air, and without the new chip burned for me, it ran like crap. So, I got to thinking, the reason people switch to mass air, is to get away from the SD "graph" , but with a new chip, you can set your own "graph" or parameters. It just sounds easier to get a chip burned for his specific applications, rather than going to mass air conversion.

91GT5.0

Actually, the earlier model cars are rated higher because Ford changed the way they rated hp from the factory in '91 I think it was. That's wierd that you still had to reburn your chip even though you're mass air, the mass air is supposed to be able to adjust the computer when you mod it.

As far as your friend, he can get an EEC tuner and tune his computer to whatever he wants.

Sicy Stang

You guys are confusing me because you both have the same avatars. <img border="0" src= "http://www.gamers-forums.com/smilies/contrib/sarge/Twitch_anim.gif>

jeep45238

You sure your Vette's Mass Air?



Speed Density is BAD. Bad bad bad bad BAD. I was REALLY heavy into offroading before I got my first car, and man, those Bronco's are infamous for that stuff.



People would do all kindsa stuff to 'em and not see any gains since no more fuel was being injected. Course, we had a Jeep, and heheh, well, we saw many many gains after a 350 popped itself under the hood. Saw even more when some headers, a cam, and some other custom stuff was tacked on there.

4aFriend

Sorry to confuse you Sicy, lol. Yup, my vette is mass air for sure. The computer compensated a bit by itself but couldn't get all the mods straight. There is a fair bit of info on the chip that it runs off of. It was running pig rich without a custom chip tune.

<img border="0" src= "http://temp.corvetteforum.net/c4/black89vette/massair.JPG>