Sorry for the confusion turboxp. What is your tuning like on the aero setup?? What kind of boost??
Thanks!
Jake
Thanks!
Jake
Carbed 2 stroke turbo guy's !!!
- Thread starter gus bohne
- Start date
TTT. This is a good thread, lets keep it around.
Gus, on the charge tube issue of bringing it in the end of the charge box could I just aim the inlet away from the carb throats?? Like bring it in at a slight angle towards the back of the box??
Gus, on the charge tube issue of bringing it in the end of the charge box could I just aim the inlet away from the carb throats?? Like bring it in at a slight angle towards the back of the box??
I know most in here are talking about the Doo's. Im curious to see if anyone has a "Kit" available for the Carbed Cat's setup and ready with all that is needed to install... I have an 05 900 kingcat.. I have SLP pipe and speedwerx heads. Would I have to replace them to turbo it? My 900 runs very well but I want turbo.. lol..
T
turboxp
Active member
turbo
Sorry for the confusion turboxp. What is your tuning like on the aero setup?? What kind of boost??
Jake
I run 10lbs and as far as tuning it is not bad you just have to be happy with just about perfect don't go for that little extra or you will have problems.
Have had more problems with the xp than the rev but that has alot with me pushing the envelope.By the way Dave sweet looking turbo set up you built for the xp.
GLENN
Sorry for the confusion turboxp. What is your tuning like on the aero setup?? What kind of boost??
Jake
I run 10lbs and as far as tuning it is not bad you just have to be happy with just about perfect don't go for that little extra or you will have problems.
Have had more problems with the xp than the rev but that has alot with me pushing the envelope.By the way Dave sweet looking turbo set up you built for the xp.
GLENN
Thanks Glenn. I try to keep everything nice and tidy with the kits. I want it to look like it was factory. I use as many Ski-Doo parts as I can for ordering purposes. It's one thing to build a one off, but to go into production the documentation has consumed more time than the build. I have a file full of different part numbers and different suppliers. You have to take notes and document. Then the same for any testing.
Dave
Dave
Hey Gus,
I've got a big bore twin cat. Kinda tossing around the idea of running a low pressure setup to get some sea level HP at my elevation 7 - 11K ft. I read and hear about porting being the problem. With out giving away the farm is there some port timing data available for optimum?
I'm guessing that the milder porting the better for big boost, but I'm going to try to stay on mellow side so I can work with what I got.
Thanks,
Tony
PS very cool thread.
I've got a big bore twin cat. Kinda tossing around the idea of running a low pressure setup to get some sea level HP at my elevation 7 - 11K ft. I read and hear about porting being the problem. With out giving away the farm is there some port timing data available for optimum?
I'm guessing that the milder porting the better for big boost, but I'm going to try to stay on mellow side so I can work with what I got.
Thanks,
Tony
PS very cool thread.
Busted
Hey Tony
Busted, I thought you would never consider a turbo?
Just when you think you have enough HP you want more.
I say Boostit, Good luck.
Dave Bell
Hey Tony
Busted, I thought you would never consider a turbo?
Just when you think you have enough HP you want more.
I say Boostit, Good luck.
Dave Bell
Porting depending on how its done can affect boost in diffrent ways. Port timing can make a huge diffrence. Tall exhaust ports can hinder perfromance since its letting the extra boost/cyl pressure out early you are kinda wasting some of that energy out the exhaust prematurley. If you boost your BB'd ride will it make more HP, YES! It may not make as much HP per lb of boost but it will increace HP all toghether!!!
Tony what big bore cat are your eluding too ??
the port timing on any engine is NOT always an issue.
many times unported big bores perform better than retouched ones WHEN under boost.
Excessive blowdown TIME is a sticky culprit for most aftermarket kits from the past. Up to date kits may not be an issue..
a 9400 rpm set up is poor candidate.
a set up that mirrors stock rpm or close to it is a good candidate.
In any case NO AMOUNT of polishing, thinning , or knife edging will show any gain for the good period.
pretty don't make power ,,, in most cases it detracts from it.
polished ex ports are THANKFULLY out of vogue now too !!
that was a hard one to get thru the heads of the Aaen mentallity...era.
Why ?/
Boundry layer..
gus
Hey Gus, I'm running a cutler 1000 on an M7 at 8050 rpm. I've been told that this setup doesn't turbo well. I assumed it's because of too much port open time, but I have not degreed the ports yet to find out what it is.
I canned the EFI a few years back in favor of a set of big cutler carbs. I'm assuming that I would need to get a stock set of 40s for the turbo.......or do you like something else better?
Even though I run low compression heads I assume that I would still need to lower the compression.
Another assumption (I'm full of them) is the timing key(2 degree) would have to go or even turned around retarded?????????
What are your thoughts?
Hey Dave, Not busted yet.......I'm researching and thinking out loud. You don't have to worry about me just yet.........course when did you ever...LOL
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LOL ya the polished exhaust port idiocracy...
So gus, on a high exhaust port motor can work well under boost if the motor runs, say, 8000 rpm for peak output?? As for blowdown timing, can a high exhaust port engine be made to work better under boost if the transfers are raised?? Or does it not work that way??
So gus, on a high exhaust port motor can work well under boost if the motor runs, say, 8000 rpm for peak output?? As for blowdown timing, can a high exhaust port engine be made to work better under boost if the transfers are raised?? Or does it not work that way??
I find it hard to swallow that it would be a bad candidate from an rpm standpoint.
compression wise, you already have low comp domes so I would see ONLY the need to address squish adjustments.
timing would be best left stock or maybe 2 retard , this is adressed in the field and is a very strong tool for pipe heat tuning and boost transiiton tuning..
As long as the cooling on the cutler cylinder is well designed I see no reason it can't be used for a turbo..
.
Jake, a high ex port open duration is what we don't want in a torque biased engine formula.
That should answer your question and point you in the right direction
It used to be finicky before carbs. It's a dandy now(three years). Getting rid of the efi was the neatest thing I did. If I did go turbo, I'd do it with carbs. Used high perf motors aren't worth anything so I gotta stick with what I got and know.
The guys you know who have tried it....what kind of setup did they have and what types of probs did they encounter? Did they run good once and crappy later?, or was the performance never there to start with?
Had a turbo on my 97 700sx.
LOADS of fun ....
straight forward easy set up but NOT a big power producer..
210 hp @ 18 psi..
9-10 psi just over 170 hp
tends to run the engine hotter than ususal with the under footboard coolers.
the cpc 1000's issues are directly related to the efi program vs the unpreditcable , inconsistency of the jaws pipes..
no 2 sets are the same.
Gus
LOADS of fun ....
straight forward easy set up but NOT a big power producer..
210 hp @ 18 psi..
9-10 psi just over 170 hp
tends to run the engine hotter than ususal with the under footboard coolers.
the cpc 1000's issues are directly related to the efi program vs the unpreditcable , inconsistency of the jaws pipes..
no 2 sets are the same.
Gus
S
Spaarky
Well-known member
Gus... not really suprised you had a quick answer.
The one around here just never ran. They had it on dyno... ect. I have no idea what the problem was. I have not met the gentleman. They wanted it to bring it to my best buddy to see if he could get it to run.
MtnMaxMod...... Guy I ride with has a longtrack Viper w/turbo. Needs a few tweaks but runs very well.
The one around here just never ran. They had it on dyno... ect. I have no idea what the problem was. I have not met the gentleman. They wanted it to bring it to my best buddy to see if he could get it to run.
MtnMaxMod...... Guy I ride with has a longtrack Viper w/turbo. Needs a few tweaks but runs very well.
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Hey Gus,
What do you recommend for an oil pump. I see by a previous answer that you recomend 30 PSI. Is that to a restrictor orifice in the turbo?
Also want to follow up on your carb venting suggestions. You use a pitot tube in the charge tube for the source for the top of the carbs. Do you also vent the float bowls to it or to the air box?
You got me spinning big time with this thread......huh Boostit.
What do you recommend for an oil pump. I see by a previous answer that you recomend 30 PSI. Is that to a restrictor orifice in the turbo?
Also want to follow up on your carb venting suggestions. You use a pitot tube in the charge tube for the source for the top of the carbs. Do you also vent the float bowls to it or to the air box?
You got me spinning big time with this thread......huh Boostit.
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