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#1 |
Registered Member
Join Date: Nov 2002
Posts: 68
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![]() Recently i installed a set of 4.10's for my 87 5.0 It was running very well at WOT with the stock 2.73's. Now when i want to get on it it sortas stops at a certain RPM around 3000-4000. i have tried retiming it and adjusting the fuel pressure. Please help...
many other mods on the motor |
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#2 |
Junior Member
Join Date: Mar 1999
Location: Ventura, California
Posts: 8,981
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![]() What exactly happens? Does it detonate? Does it just fall flat? What does it do? What rpms did you take it to before? What else did you do? What's been done?
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Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local
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#3 |
Registered Member
Join Date: Nov 2002
Posts: 68
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![]() Well when i take it to the strip i shift at around 5000 - 6000 rpms. it was accelerating quite nice. i have a rebuilt 302 bored to 306 with new pistons 10.1 ratio holley systemax II upper and lower intake, 75mm throttlebody 75 egrspacer, longtube headers short h-pipe, and flowmaster catbacks, cold air intake, 75mm mass air 24lb injectors, fuel pressure regulator, stock t5, and king cobra clutch, fully ported and polished e7 heads.
it gets a certain rpm then it just stays their and doesn't want to go past it when i mash the pedal down. i am thinking its the WOT timing in the computer....??? |
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#4 |
Registered Member
Join Date: May 2000
Location: Kamloops, BC
Posts: 2,875
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![]() So all you did was add the gears?
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#5 |
Registered Member
Join Date: Nov 2002
Posts: 68
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![]() yes
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#6 |
Registered Member
Join Date: Nov 2002
Posts: 68
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![]() well i thinking that the coil is going out, because on a cold start it takes forever to get it going when the starter is still turing its brains out, lol. help if ya can
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#7 |
Junior Member
Join Date: Mar 1999
Location: Ventura, California
Posts: 8,981
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![]() Sounds like a coil issue, but you should check your fuel pressure to be safe.
Take care, ~Chris
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Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local
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#8 |
Registered Member
Join Date: Nov 2002
Posts: 68
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![]() i have been adjusting fuel pressure to get more power but i went back to 32psi -30psi
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#9 |
Junior Member
Join Date: Mar 1999
Location: Ventura, California
Posts: 8,981
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![]() What happens to the pressure when you shut off the engine?
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Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local
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#10 |
Registered Member
Join Date: Nov 2002
Posts: 68
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![]() it slowly drops to 0. i forgot to mention i have a bbk inline fuel pump
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#11 |
Junior Member
Join Date: Mar 1999
Location: Ventura, California
Posts: 8,981
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![]() Well, it shouldn't move at all for a few minutes (10 to 15). If it's dropping faster than that, you have a problem, and you need to figure it out. Either your injectors are leaking, or there is a crack in the pick up tube in the tank, or, a bad regulator.
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Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local
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#12 |
Registered Member
Join Date: Nov 2002
Posts: 68
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![]() the injectors aren't leaking out the manifold the regulator isn't leaking. maybe in the tank
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#13 |
Moderator
Join Date: Aug 2000
Location: Milan, OH
Posts: 2,699
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![]() Don't forget about valve float. If you've got old worn out springs or springs too light for the cam you're running, you could be getting valve float that's keeping the engine from revving any higher.
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Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!" |
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#14 |
Registered Member
Join Date: Nov 2002
Posts: 68
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![]() thanks for the advice. i have already threw 2 valves , but li am very lucky no piston or head damage, i got all the keeperps replaced as well as the springs and rockers, with new push rods and lifters
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#15 |
Moderator
Join Date: Aug 2000
Location: Milan, OH
Posts: 2,699
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![]() What were your installed springs pressures (e.g. on the seat and at max lift)?
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Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!" |
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#16 |
Registered Member
Join Date: Nov 2002
Posts: 68
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![]() i am not sure i have to check in to that. i replaced the original coil with a accel super coil, i was hoping it would go away but still not going past rpm @ WOT
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#17 |
Registered Member
Join Date: Nov 2002
Posts: 68
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![]() okay, i called alot of places today and Team Extreme Racing gave me the most clear answer, it has to deal with the rev limiter. i reaserched this on a ford performance book today, when you change the gear ratio's sometimes the EEC equatiosn / functions aren't right and get wrong data b/c of the the change. So Team Extreme Racing told me that i would need a chip or some kind of piggy back for my EEC-IV unit. They recommended a diablo chip, whic would get rid of some of that limiter. BUt not all of it, some GT computers have this problem. But i could get the EEC-tuner for $389 which i can change this limiter which cutes half the fuel until the rpm goes back down.
I am in debate, should i get the Diablo Chip , or the EEC-Tuner? I know little about tuning the EEC, if you could help on some of the vocabulary and tuning secrets, thanx www.eec-tuner.com |
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#18 |
Registered Member
Join Date: Mar 1999
Location: Sanford NC USA
Posts: 155
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![]() sounds like trouble with the Mass Air Meter.. Its not A REV limiter thats horse hockey in my opinion... they want you to buy a chip or some tuner. look at your mass air. the connection and the meter itself to see if the wire elements are dirty..
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#19 |
Registered Member
Join Date: Oct 1998
Location: Suburban Chicago, Hanover Park
Posts: 695
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![]() Don't you have to change your speedo gear with a new ring and pinion? What are your facory gauges reading when your car falls on it's face? Is it cutting out, like it's missing, when it reaches the 4k? If it's cutting out, or missing, that's what the rev limiter sounds like in my car, but I have an MSD with the rev limiter set at 6K so it might sound differen't then when I had the factory setup.
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#20 |
Guest
Posts: n/a
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![]() How is your state of tune? Cap, rotor, wires...I had a similar problem where the power would drop off at 4300, but otherwise run fine. I heard similar advice about mass air meter, coil, and fuel pressure. Decided to go the easy route first and a quick tune up worked.
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