Alan,
Have you checked fuel pressure while driving at full boost? I know
there was a TSB for 88 turbo's to have the tank changed to run the
in-tank fuel pump due to performance problems. The only other obvious
thing (which I imagine your on top of) is the TPS. How's the
continuity to the ECU? Have you tried setting it a little (low if i
remember right) so you'll hit the WOT area sooner?
Have you tried doing much parts swapping? AFM? ECU's?
Didn't Jonathan Mccurry have a surging problem with one of his 88 D
project cars a while back? Are you still in contact with him?
8000rpm rev limiter eh? How many miles on the motor if you don't mind
me asking?
Keep us updated, I'm curious to hear what you find out.
/august
On 4/17/05, alansamet <alansamet@yahoo.com> wrote:
>
>
> I'm at a loss on this one. My turbo surges under high boost. This has
> been a problem since I purchased the car stock at the end of 2002.
> Before replying with the obvious, please read what I've checked.
>
> When this car is not acting up, it freakin' hauls. Sometimes it'll
> pull hard through second, only to start surging when I hit 3rd; it's
> on my agenda to raise the rev limiter another 1500 RPM as soon as I
> diagnose this issue.
>
> There is one strangeness, but I don't know if it can contribute. When
> I remove the gas cap, there's invariably a lot of pressure in the gas
> tank. I tried blowing into the vent hose from the tank side and it's
> very resistive. I don't really know how this could cause a surging as
> if there's rust in the tank. I assume pressure would inhibit the
> return of fuel to the tank, thus *increasing* fuel pressure at the
> rail. There is no in-tank fuel pump on the 88 505 Turbo.
>
> Let me introduce what I've ruled out:
>
> It's not the high boost cutoff switch, that's disconnected. I have my
> own boost sending module that uses Motorola MPX5700GP pressure sensor
> and a digital circuit to accurately drive the stock boost gauge for
> the 16.8 PSI of boost that I'm running (804 injectors/3.5 bar
> regulator/Danielson head and cam). There's an external relay connected
> to the circuit that engages the fuel kill at 23 PSI, but this is not
> connected right now.
>
> The fuel lines, filter, injectors and fuel pressure regulator have all
> been replaced. I pulled the gas tank out today; no rust. The fuel pump
> has not been replaced.
>
> Plugs, cap, rotor and wires have all been replaced. It still has the
> same coil it did when I purchased the car, but it's putting out a
> pretty hot spark.
>
> Any thoughts?
>
> -Alan
>
>
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Received on Mon Apr 18 10:03:01 2005
