FI for DD at elevation

[Bartly]

So been looking at Superchargers (again, lol) for my daily driver GT. Wondering about my air density living at 4k above sea level. From what I gather I need to specify or ask for a proper pulley for my elev. with whatever manuf. I end up going with. Pardon me for being a little naive but have to ask some ?? Hope someone can give me direction.

So here is the naive part. So if I get it right, with my elevation air density is going to be the thing that is "short supply" for FI, but a pulley change can take care of that right? It get's me thinking since I don't want a hog wild ultra super fast build, fuel is not really a concern of mine since my smaller pulley will be shoving about as much air into my engine as a guy with a larger pulley around sea level? (would we have sort of equivalent air/fuel ratios?) So my thinking is it wouldn't make sense for me to have larger/better injectors or a fuel pump booster. Can someone tell me if I'm off base?

Also, I see Whipple kits have stage one and stage two. I take it stage two means larger throttle body and fuel injectors? If this is the case, I'm thinking Stage 1 would make the most sense for me? Would a stage two apply to me if I was to go with a smaller-smaller pulley?

Am I making sense with my logic?

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[Bartly]

Mods can you move this to the FI section? I posted in the wrong forum.
Thanks

 

[GSLSE20B]

So been looking at Superchargers (again, lol) for my daily driver GT. Wondering about my air density living at 4k above sea level. From what I gather I need to specify or ask for a proper pulley for my elev. with whatever manuf. I end up going with. Pardon me for being a little naive but have to ask some ?? Hope someone can give me direction.

So here is the naive part. So if I get it right, with my elevation air density is going to be the thing that is "short supply" for FI, but a pulley change can take care of that right? It get's me thinking since I don't want a hog wild ultra super fast build, fuel is not really a concern of mine since my smaller pulley will be shoving about as much air into my engine as a guy with a larger pulley around sea level? (would we have sort of equivalent air/fuel ratios?) So my thinking is it wouldn't make sense for me to have larger/better injectors or a fuel pump booster. Can someone tell me if I'm off base?

Also, I see Whipple kits have stage one and stage two. I take it stage two means larger throttle body and fuel injectors? If this is the case, I'm thinking Stage 1 would make the most sense for me? Would a stage two apply to me if I was to go with a smaller-smaller pulley?

Am I making sense with my logic?

Grab the Whipple stage 2 while it's on sale , their flight control software will keep your engine safe at high altitude and cheap gas

 

[Bartly]

Grab the Whipple stage 2 while it's on sale , their flight control software will keep your engine safe at high altitude and cheap gas

Yep, I saw that sale, that's what got me looking at Whipple again. I see Flight control comes with stage 1 as well. How would stage 2 benefit me?

You mention cheap gas, I only have 91 octane local. Wondering if that comes into the mix with my original question about A/F ratio?

 

[beefcake]

Whipple stage 2 will get you more air flow which you'll definitely need at high altitude

A whipple or our Paxton kit with a smaller pulley would work real well

Hit me up with questions on either system

We have specials running on both

 

[Bartly]

Whipple stage 2 will get you more air flow which you'll definitely need at high altitude

A whipple or our Paxton kit with a smaller pulley would work real well

Hit me up with questions on either system

We have specials running on both

Thanks for chiming in. Can you give more info on how stage 2 gives more air flow than stage 1? Lost of money, so I have to at least think I know what I'm spending it on, lol. Thanks!

 

[beefcake]

Thanks for chiming in. Can you give more info on how stage 2 gives more air flow than stage 1? Lost of money, so I have to at least think I know what I'm spending it on, lol. Thanks!

the stage 2 gives you the bigger throttle body, makes more hp, because it can take in more air

we do a ton of cars out that way at high elevation, it takes alot more to gete what you need

got another guy running a blower that would be making 13psi, and he only sees 8 at his elevation

 

[GSLSE20B]

Yep, I saw that sale, that's what got me looking at Whipple again. I see Flight control comes with stage 1 as well. How would stage 2 benefit me?

You mention cheap gas, I only have 91 octane local. Wondering if that comes into the mix with my original question about A/F ratio?

The biggest thing to me will be the whipple calibration. If you are pullied down for elevation and happen to get into a more dense air area , the timing will have better command to be safe for your engine . If you go stage one get the bigger injectors , then if you decide to go bigger on the TB later you are already to swap it out .

With the only 91 octane available the Whipple calibration is really worth a lot , it's on another level in terms of diversity with different environments. The cam and ignition timing control is spot on for power and safety .

 

[arieso94z28]

I went with the procharger setup, stage 2 of course. DA around here can be anywhere from 6000' to 8000' on certain days. Ive had to change pulleys twice just to get my 10psi. With that said and my experience, if you plan on getting the whipple, get the stage 2 kit. You will be happy you did and not have to upgrade later.

 

[Bartly]

the stage 2 gives you the bigger throttle body, makes more hp, because it can take in more air

we do a ton of cars out that way at high elevation, it takes alot more to gete what you need

got another guy running a blower that would be making 13psi, and he only sees 8 at his elevation

The biggest thing to me will be the whipple calibration. If you are pullied down for elevation and happen to get into a more dense air area , the timing will have better command to be safe for your engine . If you go stage one get the bigger injectors , then if you decide to go bigger on the TB later you are already to swap it out .

With the only 91 octane available the Whipple calibration is really worth a lot , it's on another level in terms of diversity with different environments. The cam and ignition timing control is spot on for power and safety .

I went with the procharger setup, stage 2 of course. DA around here can be anywhere from 6000' to 8000' on certain days. Ive had to change pulleys twice just to get my 10psi. With that said and my experience, if you plan on getting the whipple, get the stage 2 kit. You will be happy you did and not have to upgrade later.

Thanks for the info guys.

 

[v8ter]

Im at 6k, da is at 10,000 on some days, and I see 9psi with the stage 2 3.75pulley, so a bigger tb is kinda a must at higher altitude, and if the kits should give me 11-12psi at sea level,even if I pulley down to be at 11psi, you're still not making up for the power lost that your engine has Na, and air density plays a factor since 10psi at sea level will net bigger gains then 10psi at any higher altitude ,so you have to be at around 13-14psi to make up for it to be at the same power level thats advertised, but at 9psi, not chaging anything at all,the power and instant torque of the Whipple will make you smile, I dont think I need to ask for more since its my Dd, but if your Goal is to get the best Et possible then you can pulley down and make up for it.

At my altitude on the supplied pulley, I can spin the tires(mt 285 street comp) in 2nd easily, at 2.5k rpm just slam the acelerator and you're going sideways, which is alot of fun,so I cant imagine having the power that you guys make at sea level, one of these days Ill find out

 

[Bartly]

Im at 6k, da is at 10,000 on some days, and I see 9psi with the stage 2 3.75pulley, so a bigger tb is kinda a must at higher altitude, and if the kits should give me 11-12psi at sea level,even if I pulley down to be at 11psi, you're still not making up for the power lost that your engine has Na, and air density plays a factor since 10psi at sea level will net bigger gains then 10psi at any higher altitude ,so you have to be at around 13-14psi to make up for it to be at the same power level thats advertised, but at 9psi, not chaging anything at all,the power and instant torque of the Whipple will make you smile, I dont think I need to ask for more since its my Dd, but if your Goal is to get the best Et possible then you can pulley down and make up for it.

At my altitude on the supplied pulley, I can spin the tires(mt 285 street comp) in 2nd easily, at 2.5k rpm just slam the acelerator and you're going sideways, which is alot of fun,so I cant imagine having the power that you guys make at sea level, one of these days Ill find out

I meant to say thanks for that info. 3.75" pulley at 6k feet. I'll note that, thanks.

I was thinking of replying back to this thread to see what guys can suggest as far as pulley size with me living at 4500' elevation. I look at the websites selling both Whipple and Procharger (need to pass emissions and want to keep my factory cats). I don't see anyone having a pulley size selection when ordering either of these two superchargers. I'm sure I could give a call and specify, are you guys who order from the vendors on here calling in your orders? I'm also just curious what size guys are using at similar elevation to mine.

Been thinking of taking the car to San Fransisco one weekend, guessing it's wise to stay out of boost when I'm down there. That ought to be interesting, I can barely keep my foot out of it now.

Thanks again for the replies.

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