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CFM numbers for Throttle bodies

flyingfool

By flyingfool
in Engines & Drivetrain

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flyingfool Senior Enthusiast

flyingfool

Posted
Posted (edited)

i did a half dozen wot runs on the freeway today. truck is stock 5.3L stock tb. stock manifold.my air box is stock, but i removed the inner baffle at the fender connectio to the filter box, Air Aid Jr. resonator delete kit .. i was amaized at the numbers the little tb can flow thru the motor.

i hit a peak of about 2100-2200 CFM at 85 mph in 5th gear, air temp 58 F , tow haul mode.

doesn't this sound high to you guys for a 330hp engine?

Just curious if any of yall get a chance to log your wot pulls on the Torque app for your 5.3 or 6.2 truck. would be interesting to see what you get

Edited by flyingfool
JONBLARC7 Enthusiast

JONBLARC7

Posted
Posted

I can tell you what my cammed 6.2 with Air raid JR with modified stock air box and headers does.  I'm getting ready to buy a ZR1 95mm throttle body and try my hand in some DIY porting.  Will see how it goes.

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JONBLARC7 Enthusiast

JONBLARC7

Posted
Posted

I got a EVAP that won't complete so I've been logging to see if it ever finished it's test so I can pass inspection.  So if anybody know how to force the test to complete I'm all ears.

 

Just in a first gear pull shifting at 6,276 or something like that.  My MAF 43.18 and MAP 94.3

lucas287 Enthusiast

lucas287

Posted
Posted
2 hours ago, JONBLARC7 said:

I can tell you what my cammed 6.2 with Air raid JR with modified stock air box and headers does.  I'm getting ready to buy a ZR1 95mm throttle body and try my hand in some DIY porting.  Will see how it goes.

Just buy a Soler and be done?? 

JONBLARC7 Enthusiast

JONBLARC7

Posted
Posted

I can get the LT5 for 196.74 through my father in-law.  The soler is 335.00 that 138 i save will go towards a LT2 intake.  

JONBLARC7 Enthusiast

JONBLARC7

Posted
Posted

Never mind it's 535 if you didn't already have a LT5 throttle body to send them.  I'll pass,  it's not and all out race truck.

lucas287 Enthusiast

lucas287

Posted
Posted

Spend some time reading through Soler's site. There's a lot of science involved with throttle bodies that I wasn't aware of previously. Would be hard to replicate. 

 

I dont actually have a Soler TB or controller so I cant speak first hand. 

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JONBLARC7 Enthusiast

JONBLARC7

Posted
Posted

I've read it and I have nothing against them and I think their pretty good.  I just don't want to spend the money.  For a full bolt-on, heads, cam 6.2 on E85.  The 95mm should not be a restriction.  Now when the truck is paided off and I put some boost to it.  Will see it that's a choke point then.  But I think the stock rods will be my first worry.

Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted (edited)
On 12/30/2020 at 8:44 PM, flyingfool said:

i did a half dozen wot runs on the freeway today. truck is stock 5.3L stock tb. stock manifold.my air box is stock, but i removed the inner baffle at the fender connectio to the filter box, Air Aid Jr. resonator delete kit .. i was amaized at the numbers the little tb can flow thru the motor.

i hit a peak of about 2100-2200 CFM at 85 mph in 5th gear, air temp 58 F , tow haul mode.

doesn't this sound high to you guys for a 330hp engine?

Just curious if any of yall get a chance to log your wot pulls on the Torque app for your 5.3 or 6.2 truck. would be interesting to see what you get

Yea, a little.  (CID * RPM) / 3456 = CFM.

Swept volume in cubic feet in one minute. 

Not knowing your gear and tire I just used the motors redline 5600 rpm and you get 523.87 cfm.

This number is multiplied by the volumetric efficiency.

Is your motor 400% volumetric efficient? ?

Edited by Grumpy Bear
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flyingfool Senior Enthusiast

flyingfool

Posted
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Posted

yeah i'm not messing with Torque OBD app,it's junk . i found a few other bugs in thier software and PIDS non-functional. 

 

HPtuners all the way for me! I love that it has a community following too. . i will do a data log  on my stock truck and see what i get, just want to establish my baseline numbers before bolt on bigger Manifold and TB.  

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