Hello All---
I want to make an announcement that as of today, I now have perfectly tuned
151 webers. No bucking, no flat spots, smooth at idle to wide open. It pulls,
in all gears, like it had 15 more HP. and when it hit 4,500 rpm it had a surge
of new power. Hard to believe, an old friend, Keith Franck, after years of
research, has re-engineered the E-tubes and hypojets to perfection. What he
has done to webers is quite scientific and over my head so I copied a post
below of some of the details from Keith's site.
Sarto
>Re: Sarto's Tuneup
> He already had my experimental e-tubes that were 8.35mm in diameter so the
impedance is okay. Next we found the front carb had the fuel level set too
high by 1mm so we lowered it back down to 25mm. The first set of hypojets to
get installed were .020" ones and when the rpms was elevated using the idle
speed screw it got hung at about 2000rpms and it was spitting, that's a dead
giveaway clue it's too lean! The stock idlejets were 45 something so next we
stuck in .026" hypojets. That did the trick, it immediately revved up and down
like a sewing machine. Went for a test drive and it runs absolutely
flawlessly. The only issue to resolve is whether or not it needs apertures in
the first progressive holes because it did exhibit symptoms of having a lazy
idle. Sarto installed a set of temporary apertures and just drove off to test
if those will in fact make the slight lazy idle symptom go away. Depending on
how that goes will determine if we need to glue in
the permanent apertures or not.
> -Keith Franck
>
He did not need the apertures after all, reducing the idle speed a tad is all
it took to stop the lazy idle symptom. Gave him some of the 1mm and 2mm
spacers to elevate the e-tubes to test later on. He left to go over to Mike
Ostrov's to have Mike see the results firsthand. It runs like sewing machine
is the best way I can describe it but also hauls ass when you want too.
We did the tuning without using an AFM. Only tuned it at this juncture to get
the tractability perfect. I might be able to improve the fuel mileage a bit
more but he needs to drive it to determine what it's getting now.
-Keith
One thing that is becoming obvious to me is the 151 carb responds to my
jetting in a spectacular fashion. The improvement is pronounced enough that
I'm seriously considering shelving my original 18s and go buy some new 151s
with three progressive holes. I have no idea why this is the case but it's for
real.
-Keith Franck
Mike Ostrov drove my Elan and confirmed that it runs like no other Elan with
webers.
A new day for webers
Sarto
_________________
lotus elan 1966 S3 FHC
36/5785
LHD
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