Speed density/cam

**LXguy88** · 08-23-2007, 09:48 AM

I'm not really sure what to do. My 87 is speed density, of corse. I want to put in either the "E" or "F" cam but being speed density i'm not sure if it will still want to idle (due to the loss of vacuum). If anyone could give me some advice on the subject it would help alot.

**ragtop86** · 08-23-2007, 11:39 PM

Originally Posted by LXguy88

I'm not really sure what to do. My 87 is speed density, of corse. I want to put in either the "E" or "F" cam but being speed density i'm not sure if it will still want to idle (due to the loss of vacuum). If anyone could give me some advice on the subject it would help alot.

it is not do to lack of vacuum the computer can't read fast as a mass air car so it will not keep up untill wot (when it goes open loop)

**lib88stang** · 08-24-2007, 11:29 AM

I know someone with a SD car with a B cam and the car is an absolute animal.

**mlowry1260** · 08-24-2007, 11:47 AM

Originally Posted by ragtop86

it is not do to lack of vacuum the computer can't read fast as a mass air car so it will not keep up untill wot (when it goes open loop)

I have to disagree on this, it's not speed of the ecu or the sensor. A mass-air car uses the airflow mass measured to calculate the load. A speed-density car only uses the MAP (manifold absolute pressure) sensor to calculate load. My car uses a map only on a standalone computer (AEM) as does Mikeymustang's car. So, I think Mikey's car (700+Rep) dispells that internet myth. It idles close to stock & has run mid-9's after driving to the track.

I would run something other than a E or F cam unless it free. The small comp Xe cam maybe or the small crower cam. The small crower cam is widely accepted as a good speed density cam. A chip could solve some of the aftermarket cam issues in speed density. If you're on a budget, scan the classifieds forum for a cam. I know there's some listed there.

**Pure Stock** · 08-24-2007, 11:56 AM

Originally Posted by mlowry1260

I have to disagree on this, it's not speed of the ecu or the sensor. A mass-air car uses the airflow mass measured to calculate the load. A speed-density car only uses the MAP (manifold absolute pressure) sensor to calculate load. My car uses a map only on a standalone computer (AEM) as does Mikeymustang's car. So, I think Mikey's car (700+Rep) dispells that internet myth. It idles close to stock & has run mid-9's after driving to the track.

I would run something other than a E or F cam unless it free. The small comp Xe cam maybe or the small crower cam. The small crower cam is widely accepted as a good speed density cam. A chip could solve some of the aftermarket cam issues in speed density. If you're on a budget, scan the classifieds forum for a cam. I know there's some listed there.

I'm with you on that Mark.

**351SVT** · 08-24-2007, 01:41 PM

**Pure Stock** · 08-24-2007, 10:32 PM

Originally Posted by 351SVT

I know where there is an AEM that was *supposed* to be in a 1993 Electric Red clearcoat metallic LX hatch. Maybe we can retro-fit it into ole' Casper and shoot for bottom 13's with a little bigger cam and that 2,800 convertor and...........

**badf250** · 10-02-2007, 10:41 PM

I'm in the same situation that you are: maybee this will help:
http://www.mustangforums.com/m_21700...tm.htm#2170036

**LXguy88** · 10-06-2007, 04:01 AM

I ended up switching to mass air and running the trick flow stage 2 cam

**badf250** · 10-06-2007, 06:07 PM

Originally Posted by LXguy88

I ended up switching to mass air and running the trick flow stage 2 cam

How did the mass air conversion go? My friend just switched to megasquirt in his 91, and I cold probably score his stocker cheap. Looking at buying a harness off the net. I'd wait untill i do heads and cam though. His car is an automatic and mine has the T5 so I'm not sure if it will work.