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Ski-Doo: TURBO Turbo discussion for Ski-Doo aftermarket turbo sleds
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Old 08-28-2017, 09:49 PM
cunninghambc cunninghambc is offline
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Default 07 rev 800 carb turbo build

Done a Lot of research and finally decided strap a gtx2860 on my extra sled I'll post pics as I go and except any information anyone has to offer. I'll also answer any questions I can to help someone else that might want to turbo older sled And wants to save time searching all the forums for old boring carb turbo stuff lol. This will be run in michigan so low elevation just an off trail play sled
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Old 08-28-2017, 09:55 PM
cunninghambc cunninghambc is offline
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Default Pic of the sled



The rktek head I am using and also have a turbo cpi pipe on the way

Last edited by cunninghambc; 08-28-2017 at 10:01 PM.
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Old 08-28-2017, 11:44 PM
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It's a duel ball bearing turbo not sure if I wanna use the stock injection pump and then have to mix gas or I already have a graylor pump I could put in a restrictor. Not sure what I should go with I like the thought of not having to mix fuel but I would need some type of sensor to be sure my electric pump is working if I go that route. What do you guys think? or anyone used a graylor pump before? How long did it last I know cpi used them on there kits bit that was along time ago lol
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Old 09-05-2017, 02:18 PM
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After doing more research the gt2860 I was going to use will be to small for low elevation so I'm using the gt3076 I already have. I also decided to use the injection pump to supply the turbo with oil
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Old 09-06-2017, 01:02 AM
xpturbo600 xpturbo600 is online now
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You should talk to bryce at turbo performance. He has turbocharged a lot of carb skidoo 800 sleds. He has been there, done many. I think his tag on snowest is brycter. Do not reinvent the wheel. R&D is expensive.

Next, if you are running an 800, why do you think a 2860 is too small? In my opinion a 3076 is to big based on the mass flow generated by that motor under boost. That will be really laggy. We can discuss more if you want. You need to size the turbine housing for your horsepower output target then size the compressor wheel to match the massflow rate of the engine. Race motors rarely run 3076 turbos unless it is used in drag racing with anti lag 2 step capability. Or, in chute climbing where slow throttle response can be dealt with.
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Old 09-06-2017, 01:21 AM
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The standard gt3076 flows okay for the 800 at 14 psi with a 0.61 AR housing. The issue isnt the compressor flow, it is inertia of the wheel assembly. It is massive compared to a 28 series turbo which equates to lag. You get a similar mass flow on a 28 series turbo with a 0.86 AR. Also, the new gtx2867 gen 2 will outflow your gt3076 compressor wheel. So why go bigger? The only answers are a better map/emap pressure ratio and to scavenge more heat out of the exhaust. But, unless you run really high boost, that is unnesessary.

Let me ask...what power level do you want? Or, how much boost do you want to run? If your boost level isn't high enough to warrant the big turbo, your losing useability. Which is, in my experience, way more important.
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Old 09-06-2017, 08:42 AM
brad4639 brad4639 is offline
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As en ex-800 carb turbo owner I have a few words of wisdom I guess. First I'll start with, it was a happy day when I got rid of it lol. Don't let me deter you tho because boost is fun.

One thing I don't know about your build, is if you are planning on running race gas or not. In my case, I did not want to run race fuel so I had to put on an external waste gate to get the boost pressure down to 4psi (safe for pump fuel at sea level). I couldn't find an internal waste gate to get me down to 4.

Things maybe have changed a bit since I was doing carb turbo's but what are you doing to compensate for extra fuel when you hit boost? Powerjets, electronic fuel pump, and boost referenced fuel pressure regulator?

At the time I did mine, there was not many carb 800's running at sea level so I (with the help of CPI) had to do some figuring. I kept blowing my reeds apart from a lean back fire. I ended up using needle spacers from a Yamaha carb to get the right height.
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Old 09-06-2017, 08:50 AM
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Old 09-06-2017, 02:40 PM
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Brad those reeds look melted probably from extremely high intake temps caused from to small of of a turbo. What size turbo did you have on your sled? Yess I already have an msd fuel pump, automotive return style fuel pressure regulator. I will be reference of the pipe l.

Here is a pic of the air box I built for my zx chassis if it will fit I will use it.


Last edited by cunninghambc; 09-06-2017 at 02:44 PM.
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Old 09-06-2017, 04:20 PM
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Old 09-06-2017, 04:33 PM
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Old 09-06-2017, 05:43 PM
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Old 09-07-2017, 01:08 AM
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Old 09-07-2017, 10:36 AM
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Old 09-07-2017, 01:16 PM
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Old 09-08-2017, 02:19 AM
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Old 09-09-2017, 07:07 PM
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Old 09-14-2017, 04:12 PM
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Old 09-15-2017, 02:35 PM
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Old 09-19-2017, 02:13 PM
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Old 10-09-2017, 12:19 PM
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