opinions

[Knight_Rider]

Hey guys just wanting some opinions on my setup, its a 99 banshee has wiesco 713 series pistons 64.75mm ported barrels standard head and compression, standard timing pro design inlet manifolds FMF gold series pipes wiesco crank. When i brought the bike it had 35mm Keihn flatside carbs on it. I pulled the main jet out and it had 155 stamped on it. The bike never misses a beat goes awsome, ive noticed recently that the plugs look like they are running quite rich kind of a dark tan colour. I know its impossible to work out what jet is best by me telling you guys but does anyone else out there have similar mods to me? Im goin to do race to the sky in Easter which is a big hillclimb over here. It starts at 1500ft and goes up to 5000ft so have to get a jet sorted for that. most of my riding is done at sea level and our temperateures over here on average would be between 18-22 degrees very dry heat not humid.

 

any help would be appreciated.

 

Ps if anyone wants info on turboing a banshee let me know as we did one over here a while ago and got awsome results with it on the dyno. Took a while to get there but we got it sorted

 

Jarrad

[floydfan_90]

Hey guys just wanting some opinions on my setup, its a 99 banshee has wiesco 713 series pistons 64.75mm ported barrels standard head and compression, standard timing pro design inlet manifolds FMF gold series pipes wiesco crank. When i brought the bike it had 35mm Keihn flatside carbs on it. I pulled the main jet out and it had 155 stamped on it. The bike never misses a beat goes awsome, ive noticed recently that the plugs look like they are running quite rich kind of a dark tan colour. I know its impossible to work out what jet is best by me telling you guys but does anyone else out there have similar mods to me? Im goin to do race to the sky in Easter which is a big hillclimb over here. It starts at 1500ft and goes up to 5000ft so have to get a jet sorted for that. most of my riding is done at sea level and our temperateures over here on average would be between 18-22 degrees very dry heat not humid.

 

any help would be appreciated.

 

Ps if anyone wants info on turboing a banshee let me know as we did one over here a while ago and got awsome results with it on the dyno. Took a while to get there but we got it sorted

 

Jarrad

 

 

i have no idea on the carbs but i want to know about the turboed banshee i thought turboing a two stroke was not vary efficient due to the fact that most of the air charge will escape from the cylinder via exhaust port before it can be "trapped"in the cylinder? Did u modify the port timing or something?

Edited December 27, 2006 by floydfan_90

[Knight_Rider]

i have no idea on the carbs but i want to know about the turboed banshee i thought turboing a two stroke was not vary efficient due to the fact that most of the air charge will escape from the cylinder via exhaust port before it can be "trapped"in the cylinder? Did u modify the port timing or something?

When turboing a 2 stroke its best to leave the ports standard we have found if you open the ports up you slow the velocity of the air going into the motor the one we turboed was running 7 pounds of boost. we tried running the turbo before the expansion chambers and made more power down low than a stock banshee but as soon as we got over 4500rpm it went backwards due to the pulses in the exhaust. 1 other thing thats interesting is that the AR ratio of the turbine housing is critical as this is where all the backpressure comes from. If you get it wrong the power curve drops of quickly. After playing around and spending hours and hours we came to the conclusion that turboeing a 2 stroke without expansion chambers is a waste of time, well good if you dont want to run over 4500rpm lol there is about a 11hp gain up to 4500 rpm over a stock one.

 

With the turbo at the back of the expansion chambers and with the turbo matched to the engine properly you can safely produce 140hp on low boost levels

 

if there is anything else you wana know just leave me a message i could type for hours lol

[dajogejr]

Jankab has plenty of experience with turbos on a banshee...and I'm pretty sure he's used stock carbs and found them to work best.

 

And...he's had countless hours and days of dyno time as well as countless pipe, intake and carb combinations at his disposal to try.

 

Going from 1500 to 5000 feet with a turbo is asking for trouble...

 

Also...no one jet will suffice for that huge elevation change.

I gave advice to someone else about how I would handle that....it's called a powerjet...

It acts like an externally adjustable main jet, simple to add and use.

 

Basically, I'd jet the bike for 1500 feet with a few turns out on the power jet, then....as you climb, turn the power jets a little at a time to lean it out...

 

If you're jetted spot on for 1500 feet, it'll be PIG RICH by the time you get to 5000....

[Knight_Rider]

Jankab has plenty of experience with turbos on a banshee...and I'm pretty sure he's used stock carbs and found them to work best.

 

And...he's had countless hours and days of dyno time as well as countless pipe, intake and carb combinations at his disposal to try.

 

Going from 1500 to 5000 feet with a turbo is asking for trouble...

 

Also...no one jet will suffice for that huge elevation change.

I gave advice to someone else about how I would handle that....it's called a powerjet...

It acts like an externally adjustable main jet, simple to add and use.

 

Basically, I'd jet the bike for 1500 feet with a few turns out on the power jet, then....as you climb, turn the power jets a little at a time to lean it out...

 

If you're jetted spot on for 1500 feet, it'll be PIG RICH by the time you get to 5000....

Yea timeless amounts of time go into testing its incredible how much time you can spend on the dyno. 1 other thing we found interesting is we tested 10 different brands of 2 stroke oils on the dyno mixed up 5 litre containers all fully syntheic oils and tested them to see what one made the most power because alot of oil companys state there oil will make more power over other brands. Out of the 10 oils tested all of them made the same hp/torque bar 1 which was 0.5hp down on the rest.

 

The turbo we ran on out banshee was a Garrett GT3071r we used the bb turbo as they dont require as much oil flow as the journal bearing.

[Whitey]

The turbo we ran on out banshee was a Garrett GT3071r we used the bb turbo as they dont require as much oil flow as the journal bearing.

 

 

Ok I have some questions for you:

 

-For the GT3071r did you run the .64 or the .86 turbine housing?

-What did you do to oil the turbo?

-Do you have any pics of that setup?

-Which pipe did you use?

 

 

Sorry for all the questions but I've been trying to turbo my Banshee for a while now and I was shocked to see you used a GT30. I was going to use a smaller IHI RHB5 but I do have a T3/T04E with a .63 turbine that I could try. The only problem is I'd have to run an external gate. Also I ride in lots of different elevations so I'm also running fuel injection:

 

 

 

You opened a can of worms when you asked if anyone had questions :thumbsup:

[Knight_Rider]

Ok I have some questions for you:

 

-For the GT3071r did you run the .64 or the .86 turbine housing?

-What did you do to oil the turbo?

-Do you have any pics of that setup?

-Which pipe did you use?

Sorry for all the questions but I've been trying to turbo my Banshee for a while now and I was shocked to see you used a GT30. I was going to use a smaller IHI RHB5 but I do have a T3/T04E with a .63 turbine that I could try. The only problem is I'd have to run an external gate. Also I ride in lots of different elevations so I'm also running fuel injection:

 

You opened a can of worms when you asked if anyone had questions :thumbsup:

Hey sorry for the late reply. In my opinion the IHI RHB5 Turbine wheel will be far to small will be to restrictive. The GT30 we ran had the .64 housing on it, we tried the .86 but found the .64 more responsive. The reason we used the gt series turbo is because the pump dosent have to flow as much oil for the bb turbo. We played around with alot of combinations turbo's i mean and found the gt30 to be the best of them all. We tried a gt2871r but found the turbine wheel was to restrictive was getting to higher backpressure in the housing. 2 strokes require alot of air they are greedy if you ask me the 3071r comp wheel with the 53mm inducer works perfect. As for the pipes in the end we ran with FMF gold series which worked really well. We made up a exahust header for it and ran it without the expansion chambers, which worked well if you dont want to take it past 4500rpm lol it made 11hp more than a stock motor but after 4500rpm the curve went from goin straight up to straight down due to backpressure getting to high in the housing, we tried going bigger on the exhaust housing but nothing changed it didnt matter what we did we couldnt get it to work.

[Whitey]

Hey sorry for the late reply. In my opinion the IHI RHB5 Turbine wheel will be far to small will be to restrictive. The GT30 we ran had the .64 housing on it, we tried the .86 but found the .64 more responsive. The reason we used the gt series turbo is because the pump dosent have to flow as much oil for the bb turbo. We played around with alot of combinations turbo's i mean and found the gt30 to be the best of them all. We tried a gt2871r but found the turbine wheel was to restrictive was getting to higher backpressure in the housing. 2 strokes require alot of air they are greedy if you ask me the 3071r comp wheel with the 53mm inducer works perfect. As for the pipes in the end we ran with FMF gold series which worked really well. We made up a exahust header for it and ran it without the expansion chambers, which worked well if you dont want to take it past 4500rpm lol it made 11hp more than a stock motor but after 4500rpm the curve went from goin straight up to straight down due to backpressure getting to high in the housing, we tried going bigger on the exhaust housing but nothing changed it didnt matter what we did we couldnt get it to work.

 

 

Do you have any pics of this setup? Also how did you do the oiling system for the turbo? What HP level were you shooting for? I picked the RHB5 becuase I was going for right around 80 to 100HP. If breatheability through the turbine is such an issue than I might just run an external 38mm wastegate prioritize the exhaust gas towards the wastegate. For the hrsepower I'm going for it would be really inefficient to run a t3/t4. I guess we'll have to wait and see.

 

Also I'm running also running a dynoport 2-1 exhaust. Did you try and run a 2-1 pipe and what were the results with that? Some pics of this setup would really answer alot of questions.

[Whitey]

Anything?

[Knight_Rider]

Anything?

hey sorry for the late reply just got back from holiday i'll try post sum pics of the setup for ya. The exhaust pipe was a 2into 1. with the rhb5 the turbine wheel is very small and will create to much backpressure in the exhaust housing. what housing have u got on yours? 12r 15r or 20r?.

with the oil system we made up a catch tank that ran a pump which just recycled itself. I'll get the photos up cause they paint a million words

[Whitey]

Did you ever get pics?