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Author
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Topic: injector question
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allmotor50
New Member
Member # 7242
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posted
 
 
i have an 88 5.0 with cobra upper and lower intake edelbrock heads/e303 cam 1.6 cobra rocker arms MAF and throttle body and 30lb injectors...the injectors were run with a supercharger which is no longer on the car...should i downsize injectors and then tune or keep the 30's.....
Posts: 1 | From: nor cal | Registered: Nov 2006
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92stangLX
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Member # 3252
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posted
Yeah, keep the injectors. I would check the fuel pressure and adjust it appropriately.
Posts: 5302 | From: San Francisco | Registered: Sep 2003
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CA FiveOh
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Member # 7429
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posted
A lot depends on what size injectors the MAF is calibrated for. With a properly calibrated MAF meter then technically you can run almost any size injector, as long as they both match. The only problem that you could run into is with the re-scaled meter, sometimes the MAF voltage gets too low during idle which WILL put the car in limp mode. I don't think that a 30lb cal will do that...usually it's once you step up yo 42lb or larger.
One note on adjusting fuel pressure for larger injectors. I don't like doing that (unless it's your only option). What happens with the larger injectors is sometimes the car is too rich at idle which causes surging and stalling. A common cure for that is to lower fuel pressure. OK, cool, but just remember that when you do that it will lean out the whole fuel curve. Not a real big concern with a N/A combo but can be serious with forced induction.
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91 LX Notch, AFR 165 heads, E303 cam, FRPP Cobra intake, 42lb injectors, intercooled ProCharger P1SC (9 psi), 3.73's, TwEECer RT
Posts: 39 | From: Fairfield | Registered: Feb 2007
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Jeff S
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Member # 371
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posted
quote:
Originally posted by CA FiveOh:
A lot depends on what size injectors the MAF is calibrated for. With a properly calibrated MAF meter then technically you can run almost any size injector, as long as they both match. The only problem that you could run into is with the re-scaled meter, sometimes the MAF voltage gets too low during idle which WILL put the car in limp mode. I don't think that a 30lb cal will do that...usually it's once you step up yo 42lb or larger.
One note on adjusting fuel pressure for larger injectors. I don't like doing that (unless it's your only option). What happens with the larger injectors is sometimes the car is too rich at idle which causes surging and stalling. A common cure for that is to lower fuel pressure. OK, cool, but just remember that when you do that it will lean out the whole fuel curve. Not a real big concern with a N/A combo but can be serious with forced induction.
![[patriot]](graemlins/patriot.gif)
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'90 Mustang LX: 8.53 @ 157.92 w/ 1.33 60' on DR's
'10 ZR1: FOR SALE
'14 E63 S: RENNtech ECU
'04 Gallardo: UGR TTG
Posts: 2121 | From: San Jose, CA | Registered: Aug 2001
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