Max boost on a supercharger

Jinxx · 03-12-2016, 10:08 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, 09:39 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, 10:10 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, 10:17 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.

scope22 · 03-14-2016, 06:19 AM

Quote:

Originally Posted by Chuck33079

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.

i thought psi is psi, just bigger compressor would spin less to produce it

jchammond · 03-13-2016, 10:43 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, 10:49 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, 11:04 AM

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, 11:07 AM

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, 11:16 AM

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

Sent from my iPhone using Tapatalk

TopgunZ · 03-13-2016, 11:34 AM

I can see that.

Jinxx · 03-13-2016, 02:46 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, 04:36 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, 07:25 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, 10:05 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.

03-12-2016, 10:08 PM	#1 (permalink)
Jinxx Track Member Join Date: Dec 2015 Location: South Carolina Posts: 699 Drives: 2017 nismo 370z Rep Power: 3376	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, 09:39 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, 10:10 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, 10:43 AM	#6 (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, 10:49 AM	#7 (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, 11:16 AM	#10 (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, 11:34 AM	#11 (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, 02:46 PM	#12 (permalink)
Jinxx Track Member Join Date: Dec 2015 Location: South Carolina Posts: 699 Drives: 2017 nismo 370z Rep Power: 3376	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, 04:36 PM	#13 (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

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[FOR SALE] Froozen boost intercooler For stillen supercharger	EVOHUNTER	Parts for sale (Private Classifieds)	2	11-06-2015 10:42 AM
More boost Stillen SuperCharger kit	teknoprep	Engine & Drivetrain	29	05-21-2015 01:20 AM
Stillen Supercharger Froozen Boost Intercooler Install	EVOHUNTER	DIY Section (Do-It-Yourself)	0	05-16-2015 11:01 AM
Boost gauge for Supercharger	zmanelite	Forced Induction	17	02-19-2015 04:26 PM
[FOR SALE] Stillen Supercharger , Frozen boost heat exchanger, 34 row oil cooler	FrancoPhoto	Parts for sale (Private Classifieds)	21	02-18-2015 07:28 AM