Pontiac - Boost Turbo, supercharged, Nitrous, EFI & other Power Adders discussed here.

          
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  #21  
Old 07-09-2021, 12:22 AM
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Not having any problems with my bds intake at 13 lbs of boost. I have a very consistent boost number through the rom range. I’m pretty sure it would be good for maybe at almost 18 lbs of boost. After that a better intake would be wise!


GTO George

  #22  
Old 07-09-2021, 01:25 AM
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Originally Posted by twooldgoats View Post
I use one and it's a huge step up from a BDS.Highly recommend. Don't get bogged down in a discussion on "boost" with George.


Jim
Jim,
Maybe if George runs a blower for another 30 years he may finally understand.

Stan

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  #23  
Old 07-09-2021, 08:31 AM
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Jim,
Maybe if George runs a blower for another 30 years he may finally understand.

Stan
Find a car out there running around 12 lbs of boost at 3,200 lbs that will come close to out running my car or making the hp……….. just saying! LOL! It’s always the people that haven’t done it that do the most criticizing! LOL!


GTO George

  #24  
Old 07-09-2021, 09:28 AM
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OK….Stan or anyone else teac us non knowing people ( in English) about boost.
The more you make the more hp you will make providing your engine combo will take it but at my level it’s all the same!
Or we can start a new thread!


GTO George

  #25  
Old 07-09-2021, 10:00 AM
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Originally Posted by twooldgoats View Post
I run 10-15 pounds of boost, because I run a Wenzler. It would measure higher with a BDS intake, but I would actually make less power.


Jim
Quote:
Originally Posted by GTOGEORGE View Post
OK….Stan or anyone else teac us non knowing people ( in English) about boost.
The more you make the more hp you will make providing your engine combo will take it but at my level it’s all the same!
Or we can start a new thread!


GTO George
George,
How many times does this need to be said, It is mass air flow that counts not boost. Read what Jim said again and again and again until you get it.

Stan

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  #26  
Old 07-09-2021, 10:13 AM
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How many times does this need to be said, It is mass air flow that counts not boost. Read what Jim said again and again and again until you get it.
Plain english maybe?

Something like:

12 lbs boost of 'X' mass air flow is 'Xhp' (George's car?)

12 lbs boost of 'Y' mass air flow is 'Yhp' (twooldgoats car?)

'Y' has more mass air flow than 'X' so it would have more HP ('Yhp') than 'X' ('Xhp')

If 'Y' ran more boost pressure it would increase HP a lot more?


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  #27  
Old 07-09-2021, 12:24 PM
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Originally Posted by GTOGEORGE View Post
OK…
The more you make the more hp you will make providing your engine combo will take it but at my level it’s all the same!



GTO George
Wrong George.

If you put stock RAIV heads on your motor, the boost # would go up but your power would go down. Boost pressure is a result of restriction. Use better flowing heads and intake and the boost # goes down but the mass airflow goes up.
Pressure doesn’t make horsepower, mass airflow does.
More air, more fuel, more power. Simple.

BTW, just trying to help you understand, not dissing you in any way.

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Last edited by misterp266; 07-09-2021 at 12:36 PM.
  #28  
Old 07-09-2021, 01:03 PM
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Wrong George.

If you put stock RAIV heads on your motor, the boost # would go up but your power would go down. Boost pressure is a result of restriction. Use better flowing heads and intake and the boost # goes down but the mass airflow goes up.
Pressure doesn’t make horsepower, mass airflow does.
More air, more fuel, more power. Simple.

BTW, just trying to help you understand, not dissing you in any way.
Yes what you said is correct.
How do you get more air…. More boost.
There is a reason NHRA limits boost on a pro mod car….hummmm.


GTO George

GTO George

  #29  
Old 07-09-2021, 01:18 PM
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Well put. You have more patience with explanations than I do.
Jim



Quote:
Originally Posted by johnta1 View Post
Plain english maybe?

Something like:

12 lbs boost of 'X' mass air flow is 'Xhp' (George's car?)

12 lbs boost of 'Y' mass air flow is 'Yhp' (twooldgoats car?)

'Y' has more mass air flow than 'X' so it would have more HP ('Yhp') than 'X' ('Xhp')

If 'Y' ran more boost pressure it would increase HP a lot more?


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  #30  
Old 07-09-2021, 01:20 PM
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Well put. You have more patience with explanations than I do.
Jim
Ok that’s what I’ve said.
Jim’s and my engine is a good example.

GTO George

  #31  
Old 07-09-2021, 01:32 PM
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NHRA does not limit boost on roots pro mod cars. Only overdrive %.

Which would make more HP? Or would they be the same?

Your motor with a 671 making 10# of boost at 7000rpm or your motor with an 871 making 10# of boost at 7000rpm?

Boost pressure is equal. You seem to be hung up on boost pressure as the most important factor. It isn’t.

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  #32  
Old 07-09-2021, 01:54 PM
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Originally Posted by misterp266 View Post
NHRA does not limit boost on roots pro mod cars. Only overdrive %.

Which would make more HP? Or would they be the same?

Your motor with a 671 making 10# of boost at 7000rpm or your motor with an 871 making 10# of boost at 7000rpm?

Boost pressure is equal. You seem to be hung up on boost pressure as the most important factor. It isn’t.
Actually the 8-71 would probably make more hp….the charge in it would be cooler because of spinning the 8-71 less to make the same boost.
Boost numbers are just numbers but you can learn a lot from your boost readings.
No one has said anything that I haven’t.

GTO George

  #33  
Old 07-09-2021, 03:41 PM
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How do you get more air…. More boost.
Not necessarily.
With a 6-71 on your engine probably couldn't get enough boost to make the same HP as the 8-71. You may have 20 or more pounds with the 6-71 but not the higher HP.

Then there is the cam selection, intake selection, RPM range, etc that would dictate the boost also for the amount of HP.


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  #34  
Old 07-09-2021, 03:55 PM
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Not necessarily.
With a 6-71 on your engine probably couldn't get enough boost to make the same HP as the 8-71. You may have 20 or more pounds with the 6-71 but not the higher HP.

Then there is the cam selection, intake selection, RPM range, etc that would dictate the boost also for the amount of HP.

John we r talking about all things being equal. Pounds of boost on different combo, small cam vs large cam….small ported heads vs high flow heads would be different. HP gains would be smaller



GTO George

  #35  
Old 07-10-2021, 12:53 AM
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Originally Posted by GTOGEORGE View Post
Actually the 8-71 would probably make more hp….the charge in it would be cooler because of spinning the 8-71 less to make the same boost.
Boost numbers are just numbers but you can learn a lot from your boost readings.
No one has said anything that I haven’t.

GTO George
George you just awnsered your own question, in a way.

GT

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