[Supras] Whipping noise, throttle control, stock fuel piping

[berniek at technicaldevelop.com]

Jim:

Thanks for the information.  I've understood that bad things happen if the
pulsation damper is removed, including unequal fuel delivery between
cylinders, presumably due to standing waves in the fuel rail at certain
speeds.  That is not surprising when considering similar situations
arising from water hammer in plumbing systems.

The question is how to set the pulsation damper on the premise it is
retained.  At idle and slightly higher I can feel light hammering in the
(modified stock) FPR, apparently from effects of nearby injectors.

When assembling the engine I was surprised by the restrictive size of some
of the fuel feed fittings.  Thankfully that is more easily rectified than
changing the fuel line from the rear of the car.

Thanks

Bernie


> The stock fuel line under the car is large enough, but
> there are other restrictions in the circuit such as the
> fuel pulsation dampener, FPR, and various other banjo
> fittings that can be opened up or eliminated.
>
> On Tue, Feb 05, 2008 at 02:36:41AM -0500, berniek at technicaldevelop.com
> wrote:
>> Jim and group:
>>
>>
>>    In summary, I'm just beginning to see a very small amount of
>>    fuel mixture leaning at 18 PSI boost.  It could be the boost
>> extrapolation mapping of the stock ECU, but as you pass 350-375
>> flywheel HP (just a guess at this point) with low compression
>> ratio, fuel requirements start to climb to about 3/4 GPM or
>> slightly more if you run really rich.
>>
>