Turbo CR500 trike that actually works!

[theBOOSTDOCTOR]

Well some of you guys think that a turbo doesn't work well on a single cyl 2stroke. Well, I 'm here to tell you that it works well. I just installed a GT15 on cr500 trike and it's a beast. No poppin, skipping, blubbering or any kind of tuning issues. Just lots of power. Here's a short test run. I'll post more later.

http://www.youtube.com/watch?v=8QMl68Jd3jI

[lndy650]

nice.......

[MagicJames]

Awesome, can't wait for more close up pics.

[jeddy]

What's the powerbomb part of your pipe for (just before the turbo)? How are you oiling the turbo and where do you return it? How are you fueling it? Looks sweet, would like to see more pictures of the whole setup.
-Jed

[theBOOSTDOCTOR]

What's the powerbomb part of your pipe for (just before the turbo)? How are you oiling the turbo and where do you return it? How are you fueling it? Looks sweet, would like to see more pictures of the whole setup.
-JedThe powerbomb thingy is a steel braid flex pipe. The tank on the side is a oil resevoire. It has an electric pump to circulate the oil and regulator to hold 50-60psi. I'm using a Bosch electric fuel pump for fueling duties.

[theBOOSTDOCTOR]

some better pics.

[jeddy]

Very cool. I assume you have some sort of boost sensitive fuel regulator, or what is going on in the box connecting the compressor to the carb? I assume that your oil tank is the one down by the rear brake and that's your regulator behind it. Looks like the fuel pump under the seat? I'd love to hear how that thing sounds. I'm putting a turbocoupe engine in my buggy tonight, so I've had turbos on the brain lately...
-Jed

[factoryX]

wow where are the two stroke turbo haters?

[jeffatc250r]

Sweet! Is this something that you pieced together, or did you buy it as a kit? Very very cool to know that it does work. I figured it must since there are a bunch of banshees running them. Cant wait to see some action vids of it in competition.

[theBOOSTDOCTOR]

Sweet! Is this something that you pieced together, or did you buy it as a kit? Very very cool to know that it does work. I figured it must since there are a bunch of banshees running them. Cant wait to see some action vids of it in competition.
I fabbed everything myself. There's no market for a turbo cr500. lol I hope to have some good footage this weekend at Buso Beach. I took it out yesterday, but was having problems with the fuel pump.

[theBOOSTDOCTOR]

Very cool. I assume you have some sort of boost sensitive fuel regulator, or what is going on in the box connecting the compressor to the carb? I assume that your oil tank is the one down by the rear brake and that's your regulator behind it. Looks like the fuel pump under the seat? I'd love to hear how that thing sounds. I'm putting a turbocoupe engine in my buggy tonight, so I've had turbos on the brain lately...
-Jed

The box between the carb and turbo is a plenum. There's nothing inside. I'm using a Honda Civic fuel pressure reg to regulate the oil pressure and a Mallory bypass reg to control fuel pressure. the oil pump is mounted at the bottom of the swingarm.


Btw, I have a turbo rotary Corolla.
Here's a couple of vids.
http://www.youtube.com/watch?v=7Xo8X2HXGvE
http://www.youtube.com/watch?v=7L3DhuxJees

Turbocoupe motor in a buggy sounds like a fun project. Good luck with it. There's a SVO running around here thats pretty fast.

[jeffatc250r]

What kind of problems with the fuel pump? Is it pumping more than the float can handle and coming out the overflow? A friend of mine tried putting one on his quad and had that issue. Looking forward to some footage this weekend.

[theBOOSTDOCTOR]

What kind of problems with the fuel pump? Is it pumping more than the float can handle and coming out the overflow? A friend of mine tried putting one on his quad and had that issue. Looking forward to some footage this weekend.No...the fuel pump locked-up and quit working.

[jeffatc250r]

Hey Doc, any updates on this? I was poking around and found some gt-15 turbos on ebay, 275 buy it now. Is that what you used? How much of a power increaase do you think you got out of it?

[tw05tr0k35]

This is interesting. How much boost does it make? Since you have the wastegate plumbed i assume you need to control boost, and by that i mean you are not blowing fresh charge out the exhaust port to control it. Is the expansion chamber an off the shelf peice or something you fabricated or had made? I would think that a specially designed pipe with an extreme pulse wave would have to be constructed to stuff the cylinder properly with an air pump attached to the intake. Did you do anything special with the porting to accomadate the turbo setup? I'm not asking for particulars, only if it is ported different from a typical dragrace type port configuration. I have a lot of experience with turbos in an automotive application and they are absolutely the most efficient power adder (IMO) out there. I've done some research on turbo's and two strokes but there are not many ppl out there that have made them work right, and they only work in a narrow range, and the space limitations on a typical three wheeler are prohibitive, but your packaging is awesome. Also, your bike is a drag racer, and is probably tuned for a narrow powerband, how is the power curve? Most drag 500 class engines still make (relatively) impressive torque numbers simply because of their size. Is this true with yours? I realize there are a lot of questions here but any answers you are willing to give would be appreciated. Great job on the bike, it looks absolutely awesome.

Tom

[theBOOSTDOCTOR]

Hey Doc, any updates on this? I was poking around and found some gt-15 turbos on ebay, 275 buy it now. Is that what you used? How much of a power increaase do you think you got out of it? Sorry for the slow response. I havn't been on here in a while. I have a Garret GT-15. The turbo you are looking at is a copy of this turbo. The Garret is around $600. I think the bike is making around 100hp; but I have not confimed these numbers. Let's just say that it's down right scary!

[theBOOSTDOCTOR]

This is interesting. How much boost does it make? Since you have the wastegate plumbed i assume you need to control boost, and by that i mean you are not blowing fresh charge out the exhaust port to control it. Is the expansion chamber an off the shelf peice or something you fabricated or had made? I would think that a specially designed pipe with an extreme pulse wave would have to be constructed to stuff the cylinder properly with an air pump attached to the intake. Did you do anything special with the porting to accomadate the turbo setup? I'm not asking for particulars, only if it is ported different from a typical dragrace type port configuration. I have a lot of experience with turbos in an automotive application and they are absolutely the most efficient power adder (IMO) out there. I've done some research on turbo's and two strokes but there are not many ppl out there that have made them work right, and they only work in a narrow range, and the space limitations on a typical three wheeler are prohibitive, but your packaging is awesome. Also, your bike is a drag racer, and is probably tuned for a narrow powerband, how is the power curve? Most drag 500 class engines still make (relatively) impressive torque numbers simply because of their size. Is this true with yours? I realize there are a lot of questions here but any answers you are willing to give would be appreciated. Great job on the bike, it looks absolutely awesome.

Tom

The bike is currently making around 12psi....and I have no desire to turn it up. The wasegate operates normally just like an 4 stroke setup. The pipe is the same pipe I used before installing the turbo. I really don't think that cylinder fill is an issue becuase the charge is being pumped in. I downsized the plenun and now spool is very good; comparable to a single turbo car.


Now, this project has had all types of issues; but I am slowly ironing them out. I had problems with the pipe blowing off, right crank seal blowing out, clutches not holding the power and 5th gear. These issues have been fixed. Now I have a problem with the motor breaking-up in 5th gear. I'm thinking it's ignition because this is a new problem. It pulls hard through 4th with no issues and begin to break-up in 5th; but never stops pulling.

Here's a vid that you can here the problem in. I'm racing a 4mill Banshee with ported cylinders, drag pipes and overide tranny. Track was crappy and bike was spinning and handling ill. I reinstalled my rear shock, yesterday and bike seems to handle much better.

http://www.youtube.com/watch?v=JJKkzmpXfKE

[MagicJames]

That camaro you built for the 1/8 Mile is absolutely ridiculous.
Thats a nice 500 you've got set up there. Did you switch from bike to trike to try to get better traction?

[theBOOSTDOCTOR]

That camaro you built for the 1/8 Mile is absolutely ridiculous.
Thats a nice 500 you've got set up there. Did you switch from bike to trike to try to get better traction?Yeah..more traction. Plus I'm a diehard 3-wheeler lover. lol

[theBOOSTDOCTOR]

Found out that my problem was the tranny jumping in and out of gear. I regared the bike from 14/38 to 16/38 and it made a huge difference. Damn it really pulls now. I will probably do a 1-4 overide on the trans because it is a bear to shift at this power level. We are only running 400ft right now; so 5th is not neccesary with my 16/38 gearing.

[jadleybray]

To my knowledge, no one has been able to override the 4th gear, the 500's shift pattern is not like the 250's, moves opposite on the shaft.

If your gonna setup to just drag, put the strut back on and make a new wheelie bar that's about 6-7ft long and not totally rigid, should have some flex to it. You will like the results, come out much harder.

[theBOOSTDOCTOR]

To my knowledge, no one has been able to override the 4th gear, the 500's shift pattern is not like the 250's, moves opposite on the shaft.

If your gonna setup to just drag, put the strut back on and make a new wheelie bar that's about 6-7ft long and not totally rigid, should have some flex to it. You will like the results, come out much harder.Thanks for the imfo. What size tubing and wall thickness would you suggest? Also, what paddles would you reccomend?

[Billy Golightly]

Have you tried running ATF in the transmission? That made mine shift a WHOLE lot easier (It wasn't running a turbo though, haha)

[Jason Hall]

I have a 1-3 override In my 87 500, and other than It somtime's jumping Into gear from neutral It works great LOL. One of the shift forks has a spring that holds 1st or 2nd In neutral, I will be adding a slightly stiffer spring If I tear Into the bottom end. I have to make SURE I hold the clutch In when the bike Is sitting still with the engine running, or when starting the bike. It seems like It's getting better the more I ride It.

[jadleybray]

Thanks for the imfo. What size tubing and wall thickness would you suggest? Also, what paddles would you reccomend?

.058 3/4 is the lightest I would go for the wheeliebar. Do you know or what is your estimated hp/tq? Also what is your gearing and wheelbase?

I have ran atf in my tranny with good success (313cc). But, on the rotax trike, we did have some issues with shifting as the day went on and the motor was uncharacteristically hot. I don't know if it was because of the atf for a fact, but with no other issues after splittin the cases, and running another 10 passes with different oil at the track with no issues, I believe that atf was the culprit.

[theBOOSTDOCTOR]

.058 3/4 is the lightest I would go for the wheeliebar. Do you know or what is your estimated hp/tq? Also what is your gearing and wheelbase?

I have ran atf in my tranny with good success (313cc). But, on the rotax trike, we did have some issues with shifting as the day went on and the motor was uncharacteristically hot. I don't know if it was because of the atf for a fact, but with no other issues after splittin the cases, and running another 10 passes with different oil at the track with no issues, I believe that atf was the culprit.

I estimate the bike to make 80-100 rwhp. My wheelbase is 62" and my gearing is 16/38. My son is the primary rider and he weighs 105 lbs. I havn't weighed the bike yet; but I figure it's around 260-280 lbs.

[jadleybray]

What are you runnin for a clutch?
I would make the wheeliebar round 75"s, no less. A good starting point for the paddles would be 22" 12 paddle haulers, possibly extremes. You should have the bike setup so that the swingarm sits level, generally bout 6" to bottom of frame for a atc. Adjust the forks to level out the front.