preciousroy

i have a 91 lx with a ford crate motor(b303, gt40x heads), cobra intake, 75 mm throttle body, a mass air meter of unknown size i think its a 75, and shorty headers. it seems like it runs a little rough when i hold the throttle around 1500 rpms in neutral, but im not sure if its a problem or if im still in the range where the cam is still being a little lumpy. i put fresh plugs in and hooked up my 6al today, but no difference. it had plenty of power at wot but it seems like theres alot of vibration, it also has urethane mounts. this is my first mustang out of 4 that has a cam, and im a little unfamiliar with the 'feel' of driving one. when does that lumpiness clean up in the rev range or is there something wrong?

ZachW04Stang

It sounds like everythings normal. Urathane mounts are going to give you vibration. The b cam starts making power at about 2000+rpm so at 1500 I would think the car would bog there. Also you may just want to spend the extra money and get a maf sensor that you know is correct.

preciousroy

it is bothering me that i dont know what mass air meter it is. is says proform on it and its a chrome tube, there is really fine etching in it that say 19 lb injectors and i think it says 73 or 75 mm for the size. also, are my stock injectors a restriction with these mods, should i upgrade to 24's?

ZachW04Stang

I'd think your at about the max of your 19's. You should probably get 24#'s with a new mass air calibrated for them.

ikeybmg

yea. its prolly a pro-m bullet. you should get a 76mm c&l maf and 24lb injectors.

Tims 88GT

if you can get a older pro-m get that, its better than the c&l but the new pro-m meters people are having problems with them.

ikeybmg

id just get a whole cold air intake kit from a good company if i were you.

87GTHO

check your pcv valve and you IAC

ikeybmg

87gtho, you like your magnaflows? im getting ready to switch out my flowmasters for a set next week. wondeing how theyll sound. mines cammed and i have eq lenght shorties and o/r H pipe

preciousroy

thanx guys i might just do that, i definately need a new cold air setup, it has a bbk on there now and its horrible, fit fit sucks and the rubber joints are about to start splitting.