Fuel Issue

[mustanglx91]

1994 lightning stock expect powerdyne blower. Have inline boost pump and FMU. Timing is set at 6 degrees. Runs lean under heavy load. Could bigger injectors fix this? If so do I have to get it tuned? This is a speed dentsity motor.

[86lxnotch]

convert it to mass air, get 42's and the matching mass air, also is the in tank fuel pump stock? if it is change it to a 255 intank and ditch the boost-a-pump. def get the correct injectors and get the thing tuned. a FMU is nothing but a bandaid and will never give you the proper driveability that the correct injectors/mass air and a good tune will. go see frank at psi motorsports and that thing will be good to go

[mustanglx91]

Is there a way to leave the SD on.

[86lxnotch]

you can but tuning ford SD computers with bigger injectors sucks. massair makes it much nicer and if a cam swap is ever desired it can be done as SD setups dont like to much of a change in the cam

[mustanglx91]

I dont plan I doing anyother major mods. I just wanted what I got now squared away.

[77CobraII]

check out www.NLOC.net I've been doing a ton of research on MAF VS SD. MAF isn't quite that easy on these trucks, you need a transmission controller and the kits I see that are for sale are upwards of $1000. The trade off however is the 2-4 MPG more you will get with a MAF conversion. To get the most out of your truck I would save my pennies, and go with a 5.0 roller cam conversion, MAF, and a good tune.

[mustanglx91]

Ya I belong to the site to. Like I said I dont plan on moding it any more and I just wanted to see what I could do with what I got. I have read on there about guys doin alot of mods with SD. Thats why I was wondering what I could do with my situation.

[neverlift]

yea we all have fuel issue's you see the price of gas these days. lol

[osirisskater167@aol.com]

gas in my bros car only lasts about a week

[91emeraldnotch]

you should really just ditch the fmu and go with a bigger set of injectors and get it tuned. i know people say its a pain to tune speed density vehicles but it can be done. that why people like frank@ PSI get paid the money they do!!

now the best thing to do would to convert to maf and get the trans controller, but again thats a huge investment, and you would still need to get it tuned.
ken

[quik91vert]

Originally Posted by 91emeraldnotch

you should really just ditch the fmu and go with a bigger set of injectors and get it tuned. i know people say its a pain to tune speed density vehicles but it can be done. that why people like frank@ PSI get paid the money they do!!

now the best thing to do would to convert to maf and get the trans controller, but again thats a huge investment, and you would still need to get it tuned.
ken

Ditto as Ken said the easiest way would be a mass air swap , or pay a tuner to load the eec with the flow charts for at least 42 lb injectors....wait dont they come with 42 lb'ers? hmmn well if ya want the cheapest control kit ive seen is the baumann shift control or try contacting my buddy Pat the owner of level10 transmissions in NJ he may have a cheaper solution for ya then a controller or settle for what ya got