2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.
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aftermarket fuel pressure

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Old 04-20-05, 07:00 PM
  #26  
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Originally Posted by projectredsuns
so basically i wasted my money on hi-6 with a retard control. would i have to go standalone to control both coils? should i still install the hi-6 and sell the retard part of it? is the hi-6 safe to use it with nitrous?
Yeah, you did waste your money, unless you buy two more HI-6 units and 2 more retard controls.

I would install the Hi-6 on the leadings and return the retard.

The Hi-6 is a great mod for use with nitrous.

Stock timing on the stock ECU for a 75 shot is still plenty retarded from optimum; you will have no problems with it.
Old 04-21-05, 05:13 AM
  #27  
CURVE OF CONSTANT WIDTH

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thanks for all the info guys i will defentily post some dyno sheets when im all done with this
Old 04-21-05, 06:49 PM
  #28  
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My stock regulator ran 45psi with no vacuum reference.
Either my 2 stock regulators(one S4 and one S5) were broken or the walbro pump increases stock pressures but I've always run around that range.
Old 04-21-05, 07:02 PM
  #29  
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Does the stock fpr increase psi when boost is present??
Old 04-21-05, 07:26 PM
  #30  
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Originally Posted by MARTIN
Does the stock fpr increase psi when boost is present??

Yes. 1 psi of fuel pressure for every 1 psi of boost. All FPR's do this.
Old 04-21-05, 07:28 PM
  #31  
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Originally Posted by Digi7ech
the walbro pump increases stock pressures but I've always run around that range.
Yep, at idle it sure does on S4 cars. The fuel pressure would drop at WOT under load, in the higher rpms, as the engine consumes more fuel.
Old 04-21-05, 07:31 PM
  #32  
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Originally Posted by LT8TurboII
On a second note, why did you bother with a modded fuel system on an NA?

Why not? He's not the first n/a to run with an aftermarket fuel system/fpr, all depends on what your goals are for the car.
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