Stroker with factory ECU's-will it work?
#62
The fuel pumps do have slightly different Bosch part numbers. The delivery spec for the '85/'86 is 1350 cc per 30 sec while the S4 and up is 1250 cc per 30 sec. I can't recall if that delivery is under pressure or free flowing.
I use the 044 pump which is supposed to have high output, but takes more current. I wired it through an additional relay mounted in the spare wheel well. I took power from the rear power connections and activated the relay with the normal fuel pump circuit. The standard fuel pump relay and wires are barely adequate for the stock pump. I didn't want the voltage drop and other trouble from the stock circuit with using the higher current pump.
I use 36 lb injectors, but have my pressure set for 60 psi. My ECU shows a max of about 78% injector duty cycle.
Last edited by Louie928; 02-02-2008 at 06:25 PM. Reason: Add information
#63
Very impressive. Maybe this link can be helpful with injector selection.
http://www.injector.com/injectorsele...e239c17f204cbf
http://www.injector.com/injectorsele...e239c17f204cbf
Last edited by ZEUS+; 02-02-2008 at 08:02 PM.
#64
The '85/'86 pressure regulator is about 2.5 bar or 37 psi while the S4 and later regulator is 3.8 bar or about 56 psi.
The fuel pumps do have slightly different Bosch part numbers. The delivery spec for the '85/'86 is 1350 cc per 30 sec while the S4 and up is 1250 cc per 30 sec. I can't recall if that delivery is under pressure or free flowing.
I use the 044 pump which is supposed to have high output, but takes more current. I wired it through an additional relay mounted in the spare wheel well. I took power from the rear power connections and activated the relay with the normal fuel pump circuit. The standard fuel pump relay and wires are barely adequate for the stock pump. I didn't want the voltage drop and other trouble from the stock circuit with using the higher current pump.
I use 36 lb injectors, but have my pressure set for 60 psi. My ECU shows a max of about 78% injector duty cycle.
The fuel pumps do have slightly different Bosch part numbers. The delivery spec for the '85/'86 is 1350 cc per 30 sec while the S4 and up is 1250 cc per 30 sec. I can't recall if that delivery is under pressure or free flowing.
I use the 044 pump which is supposed to have high output, but takes more current. I wired it through an additional relay mounted in the spare wheel well. I took power from the rear power connections and activated the relay with the normal fuel pump circuit. The standard fuel pump relay and wires are barely adequate for the stock pump. I didn't want the voltage drop and other trouble from the stock circuit with using the higher current pump.
I use 36 lb injectors, but have my pressure set for 60 psi. My ECU shows a max of about 78% injector duty cycle.
Thanks, Hammer
#65
You could probably get by with the 30s and up the fuel pressure. If you could return them and get 36# or 42#, then do that. A lot of the boosted folks run 42#. The 42# seem more available on eBay (cheaper) so that may be a route. Depending on your cams, you are going to have a real ground pounder and it takes fuel. I just noticed, is your engine 6.0L or 6.5L? Even if a 6.0L, I'd still get larger than 30s if you could.
#68
#69
Thanks! good info on the injectors source. Ive heard the 24lbers could be fine for a 400rwhp 6.5 liter? at 70psi, it looks like it will work. The other factor is if I really have 70lbs at WOT at 6000rpm. i have never run the fuel pressure gauge on the dyno, just idling and reving in the driveway. I cant get the darn thing to not drip fuel (not the right seal). Its not a bad leak, but its a leak and that isnt right.
what do you all think about just taking .5mm of the base circle of the stock 86 cams??? i heard the lifters can adjust to this. I certainly wouldnt want banging lifter noise!!
mk
what do you all think about just taking .5mm of the base circle of the stock 86 cams??? i heard the lifters can adjust to this. I certainly wouldnt want banging lifter noise!!
mk
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