horsepower efi 300
#63
im interested to see if 4.88s will help my MPG, or make it worse...if it is even possible for it to be worse, ill be PO'd hahaha
QFT
#67
The ECU isn't the limiting factor on the SD 300s. The small fuel injectors and head design seem to be the culprits. The ECU just can't switch the injectors fast enough.
The problem with the injectors is that at about 175 hp the injectors are flowing all they can. Many users will switch to larger injectors and an adjustable FPR to overcome this problem. Unfortunately the 300s main power limiting issue is the head itself and upgrading the injectors won't really help with out a good port and polish job and a mild cam upgrade.
BTW
I have read most of Optis material on the TB swap and mods on his engines and they were well thought out and factual. He has contributed a lot to this board IMHO.
regards
rikard
The problem with the injectors is that at about 175 hp the injectors are flowing all they can. Many users will switch to larger injectors and an adjustable FPR to overcome this problem. Unfortunately the 300s main power limiting issue is the head itself and upgrading the injectors won't really help with out a good port and polish job and a mild cam upgrade.
BTW
I have read most of Optis material on the TB swap and mods on his engines and they were well thought out and factual. He has contributed a lot to this board IMHO.
regards
rikard
#68
The ECU isn't the limiting factor on the SD 300s. The small fuel injectors and head design seem to be the culprits. The ECU just can't switch the injectors fast enough.
The problem with the injectors is that at about 175 hp the injectors are flowing all they can. Many users will switch to larger injectors and an adjustable FPR to overcome this problem. Unfortunately the 300s main power limiting issue is the head itself and upgrading the injectors won't really help with out a good port and polish job and a mild cam upgrade.
BTW
I have read most of Optis material on the TB swap and mods on his engines and they were well thought out and factual. He has contributed a lot to this board IMHO.
regards
rikard
The problem with the injectors is that at about 175 hp the injectors are flowing all they can. Many users will switch to larger injectors and an adjustable FPR to overcome this problem. Unfortunately the 300s main power limiting issue is the head itself and upgrading the injectors won't really help with out a good port and polish job and a mild cam upgrade.
BTW
I have read most of Optis material on the TB swap and mods on his engines and they were well thought out and factual. He has contributed a lot to this board IMHO.
regards
rikard
...IIRC the stock injectors are 14 #/hr. at 39PSI...the 300 runs 58 PSI so the injectors are flowing at around 17 #/hr. ... 19# injectors @ 58 PSI will flow something like 23.2 #/hr which is enough for 250 HP at a 90% duty cycle or about 220 HP @ an 80% duty cycle so an AFPR is not really needed.
#69
#70
oh i know it could be worse...i think i know why it went down from like 12+ though...when my buddy was helping me he changed the rear diff oil...and i found the bottle behind the seat...130 weight...i usually use 75-90 ... i bought the oil so i must not have been paying very close attention at all, so i cant get mad at him lol...but i gotta get that fixed ASAP and see how much that helps LOL...
still dont know why my truck never warms up anymore...replaced the t-stat and now sometimes it will get up to temp normally and other times it doesnt even get close...its very random and annoying...any ideas with that one? ive been trying to think it through but ive been busy with the tranny and t-case swap ... grr...never ends
#71
"I was thinking about doing a rebuilt on my 300. It is a fuel injected motor (1988) and I was wanting to increase the power a little bit...without changing the computer? I know the heads are restrictive and swapping in a cam might be out of the picture because I remember reading some where that you have to get the ecm tuned. What I am wondering is there anyway to get another 25-30 hp ontop of (what's) stock?"
My edits (sorry Nick). So after a month - any verdicts play out on dyno facts? Any with some kinda less reliable support (the 'arguments'/differing opinions show consensus doesn't work)?
My edits (sorry Nick). So after a month - any verdicts play out on dyno facts? Any with some kinda less reliable support (the 'arguments'/differing opinions show consensus doesn't work)?
#72
Hi guys, I did exactly that just one year back, I'll Explain what I did:
1° I got a stock rebuilt engine kit Sealed Power (Pistons .020", premium rings, valves, springs, crankshaft bearings .010", etc)
2° I got a Crame Cam 503905 + New Sealed Power lifter set.
3° 6 Motorcraft inyectors CM5041 + Variable fuel pressure regulator
4° 2.25 exhaust pipe + high flow muffler
No extra cooling was requiered, no tunners, programers, chips, nothing else.
My truck is F150,1995 4.9L + E4OD 4WD
1° I got a stock rebuilt engine kit Sealed Power (Pistons .020", premium rings, valves, springs, crankshaft bearings .010", etc)
2° I got a Crame Cam 503905 + New Sealed Power lifter set.
3° 6 Motorcraft inyectors CM5041 + Variable fuel pressure regulator
4° 2.25 exhaust pipe + high flow muffler
No extra cooling was requiered, no tunners, programers, chips, nothing else.
My truck is F150,1995 4.9L + E4OD 4WD
#73
any dyno numbers? or guesstimations? i like numbers
ive decided to focus more on fixing the damage in my ole 300 than the build up...so as far as power for the build im good with anywhere from 175 to 225...but i want to see 300# of torque...then anfter a while if i want more i can do that turbo ive always drooled over LOL...i wonder what a straight pipes 300 would sound like with a turbo...bet it woud sound even more like a big rig, that what everyone says mine sounds like now
ive decided to focus more on fixing the damage in my ole 300 than the build up...so as far as power for the build im good with anywhere from 175 to 225...but i want to see 300# of torque...then anfter a while if i want more i can do that turbo ive always drooled over LOL...i wonder what a straight pipes 300 would sound like with a turbo...bet it woud sound even more like a big rig, that what everyone says mine sounds like now
#74
No Dyno numbers BUT think about this.
Right now the injectors are running with 58 psi Using any calculator for the know flow (19Lb) and fuel pressure it could reach about 205 HP.
Since computer is not giving Reach condition error, I assume it can handle the increased fuel and air amount. More over, it feels stronger than stock.
Right now the injectors are running with 58 psi Using any calculator for the know flow (19Lb) and fuel pressure it could reach about 205 HP.
Since computer is not giving Reach condition error, I assume it can handle the increased fuel and air amount. More over, it feels stronger than stock.