maf conversion -5.0 SO

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maf conversion -5.0 SO

May 28, 2006, 08:15:37 AM

I have a 19 lb maf sensor and an A9P computer, but I have read that you shouldn't do the maf conversion to a 5.0 SO. What are the reasons?

I'm just assuming that if I upgrade to 19lb injectors, it would be fine. Is there more to it than that?

Thanks for the input in advance. Scott

maf conversion -5.0 SO

Reply #1 – May 28, 2006, 09:02:03 AM

There's more to it than just the injectors and the computer.
You need a full HO setup. Heads, cam, intake and so on.

Even with the stock HO setup, you will not benefit from the Mass Air conversion unless the motor is modded.

If you really wanted to do the HO conversion, look here

maf conversion -5.0 SO

Reply #2 – May 28, 2006, 10:32:06 AM

Have heard you'll actually,loose power due to the fact that the 55mm maf is the restriction before the tb.
However when i did the conversion to my HO i did not notice a diff.

maf conversion -5.0 SO

Reply #3 – May 28, 2006, 01:57:07 PM

MAF is a waste on a stock HO 5.0 and TOTALLY absurd on a SO. The fastest STOCK 5.0 Stangs were the '87-'88 Speed Densety cars...

Unless the engine has a long duration cam(lumpy idle/low manifold vacspooge) it just ain't necessary. I speak from experience I did the conversion on a 5.0 Stang I WAS planning on modding and lost .25 at the track. Decided to go the Bird route, so I converted it back(and regained the lost performance)before I sold it..

dominator... As I understand it the 55mm meter really isn't the reason the MAF Stangs were slower, it is the A/F ratio. If what I read some time ago was correct, it was stated the MAF is actually a little rich on WOT where as the Speed Densety system was actually closer to optimum ratio.

IF you think about it, the 60mm T-body probably flows LESS than the 55mm air meter because it has a 1/4" shaft through the center of it.

maf conversion -5.0 SO

Reply #4 – May 28, 2006, 08:43:31 PM

True about the speed density being the quickest and there is debate to weather the flow restriction of the 55mm verse the 58mmtb is actually the problem.Hoiwever it also depends on the eec-iv you run,have read many an article(long ago) on the A9P(auto)and A9L(stick)being the most agressive fuel and timing tables,versus the 3 or 4 other maf eec's out there(not sure of there catch codes).
Had to go maf with mine although i am modding mine pretty heavy with the supercharger and all.

maf conversion -5.0 SO

Reply #5 – May 29, 2006, 02:25:37 PM

stock for stock aod to aod my buddies 88 would walk away from me all day long with an over exhausted car. (stock 93 engine no M/a meter) and me having a stock mas air meter car. just plain sucksat times. i have thought of going SD but not sure.

and i thought that the mass air cams wouldnt work in the SD cars i dont know. but it seems everybody that has a 88 and is selling a stock mustang has a 93 engine in it ????? whats with tht?????

maf conversion -5.0 SO

Reply #6 – May 29, 2006, 02:49:45 PM

Quote from: CougarCoupe88

and i thought that the mass air cams wouldnt work in the SD cars

If you're talking STOCK HO cams it's news to me... BUT there really ain't many aftermarket cams out there, that are better than the stock HO, and will work with SD though...

maf conversion -5.0 SO

Reply #7 – May 29, 2006, 09:29:58 PM

well i allways thought the computer wouldnt know what to do with the STOCK m/a cam. something like they are too agreeive. but could just be INternet Bs.

maf conversion -5.0 SO

Reply #8 – May 29, 2006, 09:44:33 PM

Quote from: CougarCoupe88

well i allways thought the computer wouldnt know what to do with the STOCK m/a cam. something like they are too agreeive. but could just be INternet Bs.

There's more B/S on the net than in a breeding lot...

maf conversion -5.0 SO

Reply #9 – May 29, 2006, 11:55:22 PM

All the basic parts in the Mustang HO from 87-93 are the same so it dosen't matter if the car had SD or MAF they have pretty much the same cam.

maf conversion -5.0 SO

Reply #10 – May 30, 2006, 12:47:45 AM

Quote

There's more B/S on the net than in a breeding lot...

true

Quote

All the basic parts in the Mustang HO from 87-93 are the same so it dosen't matter if the car had SD or MAF they have pretty much the same cam.

cams were funny they allways tweeked or messed with them threw the years up till 95 even.so one stock cam may be different from another. like the 440 lifts are just a basic line of where the cam should be around. but i do remember hearing once befor that the 87-88's had the best grinds. as tom said earlier in this post.

so all in all stay SD and do the HO swap and have a fun quick cat/bird do some work to the heads to mill them down a bit to bump compression .......... forget that non valve releif pistons so compression should be up a little more anyway

maf conversion -5.0 SO

Reply #11 – May 30, 2006, 07:30:28 AM

thanks for all the replys fellas. I guess I should restate my question. I didn't realize the SO motor came stock with 14 lb injectors, and I replaced my injectors with 3rd gen design 19 lb injectors. Now its running wicked rich. Is there a way to compensate for the injector change with the SD system? Would I be fine using the maf setup, knowing that I'm going to start modding?

I intend to go to a larger maf, tb, intake, and doing full exhaust once I would get it running properly, but no internal work).

Thanks for the advice. Scott

maf conversion -5.0 SO

Reply #12 – May 30, 2006, 09:36:31 AM

Speed Density likes vacuum to run properly. A good rule of thumb is that you can run speed density on a cam with a lobe separartion angle of 114 or more. Some cams with 112 LSA will work, some won't. Once you start getting real aggressive with the cams you must either go mass air or get a stand alone computer setup. Those tales about needing mass air for ANY upgrade on a 5.0 are a myth. Don't buy into it. Crower part # 15511 is a good speed density cam that a lot of Mustang guys run.

maf conversion -5.0 SO

Reply #13 – May 30, 2006, 12:20:45 PM

You could get a adjustable fuel pressure regulator and cut pressure back 5-8 pounds, the engine will think it still has 14s...

A MAF setup on the original cam will probably run OK, but the part that makes the real HP difference is the HO cam.

IF I WASN'T going to swap cams, I'd keep the orig injectors and EEC...

maf conversion -5.0 SO

Reply #14 – May 30, 2006, 01:21:23 PM

I was thinking about playing with the fuel pressure. I will have to sit down and think about that and run a few calculations...

Scott