ok, what fuel pressure regulator did u get for ur truck and did it make a difference. also the heddmen header u have, is it worth getting? i already added a K&N air filter and workin on a custom "ram" air intake setup and increasin tha 2 tubes that go frum tha airbox to tha intake manifold. with that said and done, what flowmaster muffler did u get cuz u said it sucked. i was lookin at a series 50 delta (3" inlet, 2.5" dual outlets). ne thoughts on this set up? sorry to be a pain in tha a§§, but i think tha mods u made are reasonable. thanx

 

Sorry for taking so long to reply, I don't have easy internet acces at home right now so I don't get online much.

The regulator I used is from Crane and is intended for an 88-93 5.0 Mustang. Mine cost $50, but I think they are $60 now. This is a very worthwhile mod because the stock injectors won't flow enough fuel to feed much more power than stock. You will need to upgrade to 19lb injectors to get you money's worth from most mods. However, if you put 60 psi fuel pressure on 19lb injectors you will be running way too rich, if it will run at all. You can get slightly more fuel pressure from the Crane FPR than the stock one, so even with stock injectors it is worth it. My truck has run in the 17.70's with stock injectors, but gained 3 tenths with nothing but an injector swap. That tells me the stock injectors are pretty much maxed out at that point.

The headers I have are listed for use on 78(?)-89 trucks. They should work fine on anything up to 96. I will try to get some pics online in the near future. I didn't get the chance to pull the top end apart a few weeks ago like I though I would, but I will do it soon. I hope. I say my Flowmaster sucks because of the interiot noise level at cruise. The Delta flows are much better. The 3" in/ dual 2.5" out should be fine for this application. Just make sure there are no bends right before or right after the muffler or it won't flow well. As a general rule, you need 10 times the pipe diameter between the muffler and any bends before the muffler, and as much as possible after. If you retain the catalyst, you could probably get by with less in front of the muffler. In other words, don't put a bend in the pipe closer than 30" from the muffler in front.

I am not a big believer in intake modifications on the EFI 300. I have run a vacuum gauge on mine in several situations and it has never pulled vacuum at WOT until after 4000 rpm. The items you have mentioned certainly can't hurt anything, but I don't think they will make much of an improvement.

BTW, I found out last week that the PIP sensor in my truck was bad. It's no telling how long it been bad, probably about 4 years. The PIP sensor is what tells the PCM what rpm the engine is running at. I changed it and the truck runs compeletely differently. I am going to do some tuning and adjustment in the next few weeks and week what benefit I can get. Apparently, when the PCM loses its tach signal it defaults to a mid range rpm. Probably around 2700. Since I replaced the sensor my rich on bottom/lean on top problem seems to be replaced with a lean everywhere condition, thankfully I can jack up the fuel pressure to correct this. As soon as I get it ironed out I'll post the results.

 

thank u so much for replying, u answered all my questions with good answers and again i thank u.