Bender Guys Help

[BigDog05]

maxdlx: I like the quieter exhaust. I was always unconfortable with the single exhaust.

I rode the sled about 120 miles the other day and I didn't feel like my ears were ringing. I'm 54 yoa and things that weren't loud to me 5 years or so ago, seem excessive at times now.

Its probably only 30 -35% quieter than the original, but I like it a lot at low speed riding. Especially 10-25 MPH thru residential sections etc.

JMO

 

[BigDog05]

That's what great about this site, when you are not sure of something, someone will always help you out.

I've never had anyother turbo, but I find the pitot jet works great once you get a good baseline established.

I'm leaving for the UP on Sunday, and all I did was take weight out of my clutch so I could run 6lbs of boost and not worry about gas. Turk gave me a clutch set up that I'll bet will be right on.

I expect to be able to use the pitot jet to compensate for the elevation and temp.

At home, I start out with 5 gal of 103VP unleaded, and 5 gal of 93 pump gas.After I add more pump gas, I just turn the boost down and put a little larger pitot jet in. Puts the A/F reading right where I want it.

 

[Rx1M5]

After everything is plumbed right , Try plugging the pitot jet off completely if it is still lean , this will richen it up .

So then if the pitot is plugged off and we are still lean go up on the mains and needles etc. then. Correct?

Tim:

What main jets did your Bender have at what elevation and what boost?

Did you ever swap out the GT25 for the 28? This sled we are working on is a 25.

How did your Bender measure up against your CPR, right now my CPR is a lot stronger that this Bender sled but I've watched your vids and your Bender sled looked real good. At least if we can get the two sleds running close we'll know we are in the game and if the kit can match the front mount.

One other thing I meant to ask is does the pitot affect the a/f throughout the entire rpm range or is it a WOT adjustment?

Everybody sorry about all these stupid questions but I just got educated on my front mount now I seem to be needing to learn about the rear mounts as well.

Thx Rx1M5

 

[Turbo Tim]

I had 127.5 jets with the pitot jet plugged . It ran at least as strong as my cpr front mount , It ripped ! If plugging the pitot is still too lean jet that dude up .
The pitot will affect the whole system any time it's under boost .

Gt25 is all I ever had , had it set at 14-15 psi all the time with 2 headgaskets and 100 low lead gas avgas

 

[Rx1M5]

OK

Here's where it's at cracked the carbs last night it has 135 mains installed which at 6-8000 feet should be lots of jet I'm thinking. We installed the billet tees, the rubber ones were really brittle and in all likelyhood leaking although it was hard to tell, also twinned the CV float lines, replaced all the lines with silicon, installed a BOV and a new boost gauge, added the intercooler and replumbed the air intake to come from behind the seat. New giant K&N is on the way but for now will test with the normal one that came with it. I'm thinking this has to be a step in the right direction.

Bov is plumbed off the 4 carb nipples teed together as is the boost guage. For now we are leaving the fuel pressure reg attached to the intercooler but that may change.

Billet carb caps haven't showed up yet, when they do we'll check the needles at the same time. From what I've read in previous posts it looks like they might be best at about second from the highest position(Clip 4 down).

We are going to install the 0 pitot and then try to lean it out as necessary.

Anybody think of anything wrong so far or anything we might have forgotten?

Thanks Rx1M5

 

[Quicksilver]

JMO

I just got back from riding Revy last week and I found this post. I had some issues jetting my Bender stage 2. I think you should get a set of #15 pilot jets to clean up the bottom end. I got mine fron Vernon Motor Sports. They also recomended 127.5 jets ( they install mc express ) but I found they were too lean when testing on the trail. I would try 130 mains and adjust your pitot for the trail ride up.
All last week I got my shovel out once!! We get ourselves unstuck by rolling our sleds over and I could usually roll mine by myself because the snow was deep enough. The trouble is the intercooler would fill with fuel! Most of the guys with 2 strokes would use the fuel shut offs. I started pulling the carb bowl pressure line that goes to the pitot jet. When I rolled the sled over the fuel may spill out the line but it didn't fill the intercooler. I'm going to try putting a check valve in this line as close to the vent lines for the fuel bowls as possible. That way the next time I roll my sled or lay it on its side it will keep the fuel in and the re-pressure the bowls without flooding.
God I wish I could afford a turboed Apex mtn.

 

[FAMILYMAN]

If you plug the jet and its still lean then you have a leak! I think your lean because you didnt have the aluminum tee's in yet. IMO I think its much handier to change out that jet then changing main jets in the carbs. That is the reasoning its set up this way.

I ended up keeping my fuel screws at stock position, needles are at stock, all jets are at stock. It probably could use a few adjustments to make it perfect, but you can make it perfect one day, but the next day it probably wont be because of temp changes. Just remember you change your pilot tube jet first, change carb settings last.

This is my setup, works good. Everything is equal pressure and vacum. I tee'd both lines before the carbs. I first blew into them to make sure it worked and everything opened evenly.

Also, check out the turnbuckles on both sides of the intercooler. Anything over 8lbs it wants to blow off. This is a cheap fix and works perfectly. I also use a adjustable boost controller and its very handy. I have heard that the stock ones freeze and mess up.