redline vs vette?

[Freakazoid]

Originally Posted by Sp00ner

9-10 psi, yes... check out the threads from people in Denver and such... they all report 2+ psi less...

As your quote shows, just trying to stay at sea level pressure is hard as the altitude climbs, let alone double the pressure of sea level... Also, the quote basically assumes that the planes have similar engine statistics, and then describes how it would act if that same plane were supercharged.

yea i'm trying to get something more definitive (again)

[Freakazoid]

Originally Posted by lancer

A S/C does lose boost with Altitude. However it can easily be remedied by a smaller pulley, just like a turbo would spin faster to achieve the same boost pressure. On an N/A engine, not much can be done apart from a change in tuning.

Therefore a N/A will lose a lot more than any boosted engine that as compensated for the lower boost level. Question is, with the same pulley does S/C car lose as much as an N/A engine ? I doubt it.

your last question is exactly what i'm trying to figure out.

obviously you can compensate, but just assuming you're taking the same thing and moving it over

[Sp00ner]

Originally Posted by lancer

A S/C does lose boost with Altitude. However it can easily be remedied by a smaller pulley, just like a turbo would spin faster to achieve the same boost pressure. On an N/A engine, not much can be done apart from a change in tuning.

Therefore a N/A will lose a lot more than any boosted engine that as compensated for the lower boost level. Question is, with the same pulley does S/C car lose as much as an N/A engine ? I doubt it.

We're not talking about changing pullies at all. EVERYTHING on the car remains the same.

If you're talking turbo, it's different, as it's RPM's are not limited the same way a supercharger's RPMs are. Nor is it a positive displacement pump. That's the thing to remember here. Boost on a roots blower is based on the volume of air. The density of air changes at high altitude. So while it will be gulping the same volume of air, the density will be less. That means the boost will be less, that means the power will be less.

[Fugitive]

Spooner, I noticed you have a K&N air fliter, is tha a cold air rammer? Or an OE replacment filter?

[50yroldkid]

You do't have a prayer I have a 89 convertable with every bolt on mod air pump removal chip, exhaust,ignition,throttel body etc and after 2nd gear it's by by by by see ya,so you can't beat the the L98s either

[yeahididit2]

see 50 its people with vettes that i loved to race in my rx. mainly if theres a lady with them and they get beat by a import the look on there face priceless and the look on there lady even better...lol

[lancer]

Originally Posted by Sp00ner

We're not talking about changing pullies at all. EVERYTHING on the car remains the same.

If you're talking turbo, it's different, as it's RPM's are not limited the same way a supercharger's RPMs are. Nor is it a positive displacement pump. That's the thing to remember here. Boost on a roots blower is based on the volume of air. The density of air changes at high altitude. So while it will be gulping the same volume of air, the density will be less. That means the boost will be less, that means the power will be less.

They will both definately lose power but the N/A will lose more. The supercharger spin more freely in air less dense and will make less of a parasitic loss at the same rpm. It will also produce less boost but the charge will be cooler because of this. SO you lose boost pressure but have less parasitic loss and cooler charge temp.

Slightly less loss on a supercharged engine than an N/A. N/A has everything to lose and nothing to gain from less dense air. It gets less actual compression and less efficiency. And the fact you can put a smaller pulley on a S/C to compensate with a slight loss in efficiency makes it much better for high altitude application.

[yeahididit2]

but the boost the boost the boost to the altitude boost to be boosted by the boost....f-it go turbo hook up a BOOST controller... you want boost i will give you boost....

[SMP]

This is how i see it stack up...

Good Chance: Stock L98 Vettes are know for very low hp BUT it being a TPI they make TQ at a very low rpm so dont be suprised if you get ripped out of the whole...

Not Good, But fun to watch: LT-1 make the TQ a bit higher and make more hp and are quicker...
Really not good but fun to watch: LT-4 different Intake and heads for more TQ and Hp and a bit quicker...
No Chance: LT-5 well theres not much to say...

on an average in Denver Colorado you will loose about 3-4psi at 6K feet!

So example BC3Tech we are going to install a 3.5" pulley and shoot for 5-6psi here in denver as he goes down in sea level he should be at 9-10psi with the same pulley.

Get it on vid or hell call me up i would like to check out this race

[Eco-Mod]

It's kinda another conditions and drivers race. If you get a good lauch, you stand a pretty good chance, from a roll, even better. I can creep on the regular mid-early 90's vettes. But ya know, there are alot of factors in it.