Tune day for Webers
Posted: Sun Feb 21, 2010 4:56 am
Hello All---
I want to make an announcement that 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, but our 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
Mike Ostrov drove my Elan and confirmed that it runs like no other Elan with webers.
A new day for webers
Sarto
I want to make an announcement that 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, but our 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
Mike Ostrov drove my Elan and confirmed that it runs like no other Elan with webers.
A new day for webers
Sarto