Max boost on a supercharger

Jinxx · 03-12-2016, 11:08 PM

What's the highest boost being run on stock blocks with supercharger ....I seen a few post with 11 lbs ....is that average ?

TopgunZ · 03-13-2016, 10:39 AM

I guess what is the reason you ask? Are you looking to copy the max boost? Are you trying to figure out rod strength?

jchammond · 03-13-2016, 11:10 AM

boost is boost; a supercharger just robs power to spin it.
i've seen people on here advertising close to 15lbs. (+ or -) my car is N/A so i haven't a clue what the most one can withstand..

Chuck33079 · 03-13-2016, 11:17 AM

Quote:

Originally Posted by jchammond

boost is boost; a supercharger just robs power to spin it.
i've seen people on here advertising close to 15lbs. (+ or -) my car is N/A so i haven't a clue what the most one can withstand..

Well, psi is meaningless without knowing airflow. 5 psi out of a huge turbo/sc is more air than 15 psi out of a tiny one.

jchammond · 03-13-2016, 11:43 AM

Putting a boost gauge in the intake w/same piping from large or small turbo changes nothing; but maybe the temperature of the air. 10psi is 10psi....explain Chuck33079 ?
I know a tiny turbo/supercharger will get hotter than a larger one (resulting in hotter air & power loss) but the pressure of boost is the same....

Chuck33079 · 03-13-2016, 11:49 AM

Boost is a measure of restriction. 10 psi out of a huge turbo is a whole lot more airflow than 10psi out of a small turbo.

jchammond · 03-13-2016, 12:04 PM

Quote:

Originally Posted by Chuck33079

Boost is a measure of restriction. 10 psi out of a huge turbo is a whole lot more airflow than 10psi out of a small turbo.

I agree with that statement: but put the gauge in the intake & 10psi is still 10psi, it could be a 50mm turbo or a 150mm turbo...still ,adjusted to 10psi at manifold they are = ...yes,you have plenty to spare w/a larger one...but entering the combustion chamber is still 10psi.

TopgunZ · 03-13-2016, 12:07 PM

Quote:

Originally Posted by jchammond

I agree with that statement: but put the gauge in the intake & 10psi is still 10psi, it could be a 50mm turbo or a 150mm turbo...still ,adjusted to 10psi at manifold they are = ...yes,you have plenty to spare w/a larger one...but entering the combustion chamber is still 10psi.

I don't know about that. 10 psi on my ST made 533whp where 10psi on my SC made 489.

jchammond · 03-13-2016, 12:16 PM

Yep; because your sc was robbing power; but was still 10psi.

Sent from my iPhone using Tapatalk

TopgunZ · 03-13-2016, 12:34 PM

I can see that.

Jinxx · 03-13-2016, 03:46 PM

Well I was trying to decide on a pulley size .. I'm looking at a 85mm pulley for the stage 2 gamma kit ... I'm thinking on setting the rev limiter to 7k and I should be around 11-12 psi

jchammond · 03-13-2016, 05:36 PM

I apologize for contributing to steering your question in a different direction: hopefully no harm/foul.... But I see Top Gun Z has had both- so he may have better insight.

Rusty · 03-13-2016, 08:25 PM

Quote:

Originally Posted by jchammond

I apologize for contributing to steering your question in a different direction: hopefully no harm/foul.... But I see Top Gun Z has had both- so he may have better insight.

It boils down to CFM. A small turbo at 10 psi may put out 1000 CFM. A large turbo at 5 psi may put out 2000 CFM. So which one puts out more air?

Or look at it this way. You have a 2 garden hoses. 1st one is a 1/2" hose. The 2nd hose is 1". You know the water pressure is 55 psi. Normal household psi. Which one will fill the water bucket up faster?

jchammond · 03-13-2016, 11:05 PM

Quote:

Originally Posted by Rusty

It boils down to CFM. A small turbo at 10 psi may put out 1000 CFM. A large turbo at 5 psi may put out 2000 CFM. So which one puts out more air?

Or look at it this way. You have a 2 garden hoses. 1st one is a 1/2" hose. The 2nd hose is 1". You know the water pressure is 55 psi. Normal household psi. Which one will fill the water bucket up faster?

So,what you are saying is: that with a boost gauge plumbed in the intake plenum & both super chargers/turbo's,big or small/ set at 10psi of boost (reading on gauge)-the larger Forced induction feeders will put more air into the combustion chamber?
I say that they are very capable to;but 10psi of boost (constant) is still just 10psi of boost.
that's why there are waste gates & blow off valves/in case of over boosting with the larger air pumps.
we're feeding air through the same intake at 10psi....not a firetruck doing a pump test w/multiple size hoses.

Madcow · 03-13-2016, 11:38 PM

Rusty is correct. Different forced inductions units at the same PSI can have widely different air flows. If you're curious, pull up flow charts for different turbos and compare their CFM at the same PSI.

03-12-2016, 11:08 PM	#1 (permalink)
Jinxx Track Member Join Date: Dec 2015 Location: South Carolina Posts: 699 Drives: 2017 nismo 370z Rep Power: 3375	Max boost on a supercharger What's the highest boost being run on stock blocks with supercharger ....I seen a few post with 11 lbs ....is that average ?

03-13-2016, 10:39 AM	#2 (permalink)
TopgunZ A True Z Fanatic Join Date: Jun 2012 Location: Minneapolis Posts: 2,651 Drives: 06 350Z , 09 370Z MT Rep Power: 6834	I guess what is the reason you ask? Are you looking to copy the max boost? Are you trying to figure out rod strength? __________________ ROTREX SUPERCHARGER TUNER KITS - $6799/ CUSTOM STILLEN AIR TO AIR KITS -$2100/ 700+ WHP!! WWW.TOPGUNSPEEDWORKS.COM

03-13-2016, 11:10 AM	#3 (permalink)
jchammond A True Z Fanatic Join Date: Nov 2014 Location: South Carolina Age: 58 Posts: 15,204 Drives: 13’ 370Z TS 7A/T Rep Power: 2684395	boost is boost; a supercharger just robs power to spin it. i've seen people on here advertising close to 15lbs. (+ or -) my car is N/A so i haven't a clue what the most one can withstand.. __________________ MazWorx built long block \| FI-TT-100 Stage 2.75 \| IPT built 7A/T http://www.the370z.com/members-370z-...s-musings.html

03-13-2016, 11:43 AM	#5 (permalink)
jchammond A True Z Fanatic Join Date: Nov 2014 Location: South Carolina Age: 58 Posts: 15,204 Drives: 13’ 370Z TS 7A/T Rep Power: 2684395	Putting a boost gauge in the intake w/same piping from large or small turbo changes nothing; but maybe the temperature of the air. 10psi is 10psi....explain Chuck33079 ? I know a tiny turbo/supercharger will get hotter than a larger one (resulting in hotter air & power loss) but the pressure of boost is the same.... __________________ MazWorx built long block \| FI-TT-100 Stage 2.75 \| IPT built 7A/T http://www.the370z.com/members-370z-...s-musings.html

03-13-2016, 11:49 AM	#6 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29539	Boost is a measure of restriction. 10 psi out of a huge turbo is a whole lot more airflow than 10psi out of a small turbo. __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

03-13-2016, 12:16 PM	#9 (permalink)
jchammond A True Z Fanatic Join Date: Nov 2014 Location: South Carolina Age: 58 Posts: 15,204 Drives: 13’ 370Z TS 7A/T Rep Power: 2684395	Yep; because your sc was robbing power; but was still 10psi. Sent from my iPhone using Tapatalk __________________ MazWorx built long block \| FI-TT-100 Stage 2.75 \| IPT built 7A/T http://www.the370z.com/members-370z-...s-musings.html

03-13-2016, 12:34 PM	#10 (permalink)
TopgunZ A True Z Fanatic Join Date: Jun 2012 Location: Minneapolis Posts: 2,651 Drives: 06 350Z , 09 370Z MT Rep Power: 6834	I can see that. __________________ ROTREX SUPERCHARGER TUNER KITS - $6799/ CUSTOM STILLEN AIR TO AIR KITS -$2100/ 700+ WHP!! WWW.TOPGUNSPEEDWORKS.COM

03-13-2016, 03:46 PM	#11 (permalink)
Jinxx Track Member Join Date: Dec 2015 Location: South Carolina Posts: 699 Drives: 2017 nismo 370z Rep Power: 3375	Well I was trying to decide on a pulley size .. I'm looking at a 85mm pulley for the stage 2 gamma kit ... I'm thinking on setting the rev limiter to 7k and I should be around 11-12 psi

03-13-2016, 05:36 PM	#12 (permalink)
jchammond A True Z Fanatic Join Date: Nov 2014 Location: South Carolina Age: 58 Posts: 15,204 Drives: 13’ 370Z TS 7A/T Rep Power: 2684395	I apologize for contributing to steering your question in a different direction: hopefully no harm/foul.... But I see Top Gun Z has had both- so he may have better insight. __________________ MazWorx built long block \| FI-TT-100 Stage 2.75 \| IPT built 7A/T http://www.the370z.com/members-370z-...s-musings.html

03-13-2016, 11:38 PM	#15 (permalink)
Madcow Base Member Join Date: Nov 2015 Location: Nor Cal Posts: 30 Drives: 370z Nismo/CTS-V Rep Power: 10	Rusty is correct. Different forced inductions units at the same PSI can have widely different air flows. If you're curious, pull up flow charts for different turbos and compare their CFM at the same PSI. Chuck33079 likes this. __________________ 2015 370z Nismo --- 2013 Cadillac CTS-V Master Detailer

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