Greg,
Actually the chassis dynos wideband O2 sensor showed the A/F to be a
little lean still at wot.
But since I can't get Walt out of the car long enough to do a street tune
with my wideband to show transition problems(his job has him driving
that car all over New Mexico), we don't know yet if he's rich or lean on
the track.
On Mon, 17 May 2004 21:08:35 -0700 "Greg Solow"
<gregmogdoc@surfnetusa.com> writes:
> If the fuel pressure always stays around the 3.5 psi mark, then you
> are
> getting enough fuel delivery. if the volume drops off the pressure
> will drop
> also. Sounds like there may be another problem. the 40 pump jets
> are
> probably to large, try 35s or 30 and try a 70 or 80 bleed for the
> acc pump
> inlet check valve. overall the car setup sounds to rich even at sea
> level.
> But I don't think that is the loss of power problem .
>
> Regards,
>
> GregSolow
> ----- Original Message -----
> From: "Walt Hollowell" <walt@hot-tr6.com>
> To: <fot@autox.team.net>
> Sent: Monday, May 17, 2004 5:40 PM
> Subject: out of fuel- I think?
>
>
> > I could use a little help from some FOT members that drive TR6s
> with
> triple
> > Webers.
> > In hard street use and SCCA autocross events I have no problems.
> However,
> > this past weekend I was club roadracing
> > on our Albuquerque, New Mexico 14 corner 1.65 mile road course.
> After the
> > 4th or 5th lap on full throttle the engine started falling flat as
> if I
> > dropped a couple of cyclinders due to lack of fuel (110 octane
> racing
> gas).
> > I had to fall back in the pack and not push too hard (not
> difficult with
> my
> > driving skills) or things would just run flat. I suspect I do not
> have the
> > volume of fuel I need for this racing application.
> > My engine is putting 155 hp to the ground (just did a chassis dyno
> last
> > week) with a few more ponies to be found with some more tuning. We
> are
> > racing at 5,500 ft. above sea level. I have 10.5:1 compression,
> ported
> > heads, stiffer valve springs, 286 cam, headers and triple Weber 40
> DCOE
> > carbs. My main jets are 200 air and 115 fuel. Emulsion tubes are
> F7. Idle
> > jets are 55, acelerator jets are 40 and the bleed off is set at
> zero. I am
> > using the cheap electric fuel pump you can get at Pep Boys which
> has
> > performed OK up till now..If it is the higher volume of the two
> types they
> > sell. A fuel pressure gauge shows I am getting between 2.5 and 3
> PSI of
> fuel
> > to the carbs. I am not using the stock mechanical TR6 fuel pump at
> all.If
> my
> > problem is in fact not enough volume things now get difficult. Do
> you
> think
> > I can just hook up a second (same type) fuel pump in line to
> increase the
> > volume a little or am I going to have to find a high volume, low
> pressure
> > fuel pump with a return line back to the gas tank.
> > Has anyone else came across a similar problem?
> > Any suggestions?
> >
> > Thank You
> > Walt Hollowell
> > Albuquerque, New Mexico
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