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      03-12-2017, 04:16 PM   #1
europower
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High altitude, which supercharger pulley?

I have a VF650 kit in Salt Lake City, and I am making 526 who on dynojet. Due to 4300 feet of altitude I am getting robbed of power. What pulley would I need to change to in order to make the boost that the 650 kit makes at sea level?

I researched, but could not find anything...
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      03-13-2017, 09:47 AM   #2
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What psi did you see during the dyno, what a/f ratios did you see?
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      03-13-2017, 10:05 AM   #3
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I believe I'm at this same situation as europower.
I'm located 2800 feat above sea level.
With WOT, I see 6psi and 11,2 AFR in redline.
By the way, my kit is a VF-620.
Sorry to use your post to ask questions europower, but there is no reason to create a new post with the same subject.
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      03-13-2017, 11:06 AM   #4
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having come from an area of 4,000 + I feel your pain. Matheus, that a/f is horrible.
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      03-13-2017, 02:04 PM   #5
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Serious Patron? I mean, I was thinking that it was nice.
I'm my mind a 10 AFR would be bad, but 11-12 AFR WOT in redline would be a safe value.
Could this be related with my altitude? Maybe IAT?
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      03-13-2017, 02:20 PM   #6
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Quote:
Originally Posted by Matheus View Post
Serious Patron? I mean, I was thinking that it was nice.
I'm my mind a 10 AFR would be bad, but 11-12 AFR WOT in redline would be a safe value.
Could this be related with my altitude? Maybe IAT?
definately in the safe zone but kinda rich, no? altitude most likely affecting the "a"/f ratio. doubt any of the tuners will chime in but i would suspect most power is made in the high 12s, low 13s and that is the goal for tunes.
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      03-14-2017, 08:29 AM   #7
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Well, I'm thinking about changing my blower pulley to make more boost, to compensate my altitude.
I searched A bit here and found that a 3,48" pulley, instead of my 3,60" pulley should compensate without having to change my tune, because VF uses the same Injectors for the higher kit.
Do you know if this is correct? I'm able to change the pulley without any problems?
I think that this question is the same as europower has.
Thanks
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      03-15-2017, 11:26 PM   #8
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Sorry I was absent, got busy. I do have some answers though. I currently run the 3.48 pulley, however I do not have a boost gauge.

I did find a local E92 that runs a 3.33 and sees 8.5, 9 pounds of boost. That is at about 4300 feet of altitude. That might me a lot for me, and I am assuming that I am about 7.5 now. If I was any lower than 4300 Feet I definitely would not run anything less than 3.48....
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      03-15-2017, 11:27 PM   #9
europower
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Quote:
Originally Posted by Matheus View Post
Well, I'm thinking about changing my blower pulley to make more boost, to compensate my altitude.
I searched A bit here and found that a 3,48" pulley, instead of my 3,60" pulley should compensate without having to change my tune, because VF uses the same Injectors for the higher kit.
Do you know if this is correct? I'm able to change the pulley without any problems?
I think that this question is the same as europower has.
Thanks
I actually did that exact thing about a year ago and the car has been running great....
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