Performance 460 with speed density
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Performance 460 with speed density
hey guys, My buddy has a '94 f250 with a 460. He bought a biult 460 that is around 500hp. And he put it in his truck and know it idles around 2000/3000 rpm. Do you think the SD has something to do with this or do you think he has another problem? if so what can he do about it?
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Joined: Jun 2006
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From: Ottawa, Ontario
Well the SD system really has no chance of running that motor correctly or at anywhere close to full potential, the injectors aren't big enough, the fuel pump isn't big enough, and I'd say the intake isn't big enough. If he has it crammed in there with the stock intake and exhaust it might just be choked down to the 300hp level which the stock EFI could potentially do, but as already stasted the cam is not gonna be SD EFI friendly... as in somthing that produces a steady vacuum at idle, so it won't idle any good.
The high idle is not related to this however, that's the result of a major air leak, intake gasket, stuck IAC, messed up throttle linkage, big vacuum leak...
The high idle is not related to this however, that's the result of a major air leak, intake gasket, stuck IAC, messed up throttle linkage, big vacuum leak...
Thread Starter
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New User
Joined: Jun 2009
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Well the SD system really has no chance of running that motor correctly or at anywhere close to full potential, the injectors aren't big enough, the fuel pump isn't big enough, and I'd say the intake isn't big enough. If he has it crammed in there with the stock intake and exhaust it might just be choked down to the 300hp level which the stock EFI could potentially do, but as already stasted the cam is not gonna be SD EFI friendly... as in somthing that produces a steady vacuum at idle, so it won't idle any good.
The high idle is not related to this however, that's the result of a major air leak, intake gasket, stuck IAC, messed up throttle linkage, big vacuum leak...
The high idle is not related to this however, that's the result of a major air leak, intake gasket, stuck IAC, messed up throttle linkage, big vacuum leak...
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pedant
Joined: Jan 2008
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From: EXTREME southwest CT
No!
The EFI engines have different intake and exhaust ports.
Price Motorsports makes an adapter plate to put a carb onto an EFI lower manifold but to the best of my knowledge no one makes an EFI intake for pre '87 heads.
What is he using for headers?
The EFI engines have different intake and exhaust ports.
Price Motorsports makes an adapter plate to put a carb onto an EFI lower manifold but to the best of my knowledge no one makes an EFI intake for pre '87 heads.
What is he using for headers?
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FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
No they're not and that's the problem. He needs EFI heads or maybe an aftermarket EFI intake designed for the early heads.