96 sportsman 500 turbo - Polaris ATV Forum
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post #1 of 18 (permalink) Old 10-01-2011, 10:08 AM Thread Starter
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96 sportsman 500 turbo

Hi i am new to this forum and i wanted to get some opinions i have a turbo that came off my yfz(rod through case)and i have it set up for 12lbs of boost. would my 500 handle roufly 5-7lbs of boost i can turn the waiste gate down soo it blows off at about 5lbs? i was thinking a draw trough setup turbo direct to motor with carb on sucking side of turbo?
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post #2 of 18 (permalink) Old 10-02-2011, 06:26 AM
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post #3 of 18 (permalink) Old 03-07-2012, 07:57 PM
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Ah ha
A man after my own heart.
I have lots of experience with turbos and old cars so lets settle in.
Cfm is your main concern here. If you draw in the mixture of fuel into the hair dryer you will tarnish your rotor and cause bearing issues. Since running efi is not possible I would blow air into your carbs but at 5 psi you will want to increase your jet size to 5 times the current size which might not be possible with that current carb.
5 psi is 5 times more barrimetric pressure than sea level hence the five times more fuel needed to keep it acceptable.
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post #4 of 18 (permalink) Old 03-13-2012, 07:07 AM Thread Starter
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Ah ha
A man after my own heart.
I have lots of experience with turbos and old cars so lets settle in.
Cfm is your main concern here. If you draw in the mixture of fuel into the hair dryer you will tarnish your rotor and cause bearing issues. Since running efi is not possible I would blow air into your carbs but at 5 psi you will want to increase your jet size to 5 times the current size which might not be possible with that current carb.
5 psi is 5 times more barrimetric pressure than sea level hence the five times more fuel needed to keep it acceptable.
i have a little experience with turbos also but my other concern with a blown carb would be is the stock fuel pump going to overcome to the boost? i have yamaha banshee 421 cub running 15lbs of boost on alcohol and i need to have a constant +4 fuel pressure as is 4lbs at idle and 19lbs at 15lbs of boost and so on.the turbo that is on the banshe is a decent size its a garrett m24 with a .80 compressor. the one i want to use on the polaris is a ihi vf14 wich is a small secondary turbo it doesnt matter how much boost i run weather it is 1lb or 20 i just want to see if i can get a little gain out of the motor with what i have at hand.
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post #5 of 18 (permalink) Old 03-13-2012, 10:25 AM
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As odd as it sounds you may have to run an aux pumper connected to a relay which is triggered by a WOT switch. You are delving in the relm of experimental so building a fuel pressure regulator would help with controlling your now boosted aux fuel pumper.
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post #6 of 18 (permalink) Old 03-14-2012, 04:36 AM Thread Starter
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As odd as it sounds you may have to run an aux pumper connected to a relay which is triggered by a WOT switch. You are delving in the relm of experimental so building a fuel pressure regulator would help with controlling your now boosted aux fuel pumper.
by any chance would you know how much preassure the stock pump puts out maybe i could run 2-3 lbs with out working against the pump?
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post #7 of 18 (permalink) Old 03-14-2012, 06:33 AM
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I do not know the current fuel delivery pressure. I would not be surprised if it were gravity fed.
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post #8 of 18 (permalink) Old 11-28-2013, 08:52 PM
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the newer models put out 40psi you could possibly switch out the pump if there interchangable

09 Sportsman 500 EFI
Front+Rear Bumpers
Fender flairs
Modified stock exhaust
Polaris white primary spring
Three LED marker lights on back of rear box
27" Zillas On ITP SS212 Machined Rims
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1999 Kodiak 400
completely stock so far and unbreakable
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post #9 of 18 (permalink) Old 11-29-2013, 03:40 PM
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You guys are getting close!! I wouldn't jet the carb, there are better ways!!! PM me & I will help.

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post #10 of 18 (permalink) Old 11-29-2013, 04:08 PM
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i commented on this didnt realize the last post was 2012 lol

09 Sportsman 500 EFI
Front+Rear Bumpers
Fender flairs
Modified stock exhaust
Polaris white primary spring
Three LED marker lights on back of rear box
27" Zillas On ITP SS212 Machined Rims
HID Fog/Driving Lights Wired To High Beam
Highlifter front and back HD springs
Front and back rack extenders
Synthetic winch rope
1999 Kodiak 400
completely stock so far and unbreakable
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