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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