TBI AirFlow

[Red94Chev]

what happened to the graphs? Can Airdeano repost? or someone else?

[Red94Chev]

Originally Posted by Red94Chev

what happened to the graphs? Can Airdeano repost? or someone else?

[redchevysport]

A ditto on that one. Anyone, please?

[fernanbfg1]

I plan to build a TBI 454 for a daily driver/ weekend warrior in a 94 F/S Blazer. Is the xtremefi 54mm TBI, stock?? intake, 305cc AFR heads, 1.7 rockers, stock?? cam, a decent setup?

[airdeano]

Added the TBI Flow Chart

airdeano

[Red94Chev]

Originally Posted by airdeano

5/21/05
i just got done doing a flow rating on a GM BBC TBI for 1987-1995 7.4L BBC TBI applications

Great!! Thanks!! Do you have the one for the BB TB as well?

I'm sure all you guys know that these cfm data need to be converted from 28"H2O to 1.5 inHg:

TB with injectors/injector pod, no air cleaner - 575 cfm @ 28"H2O = 490 cfm @ 1.5 inHg
TB with injector/injector pod plus injector pod spacer installed - 590 cfm @ 28"H2O = 502 cfm @ 1.5 inHg
TB w/o injectors/injector pod - 610 cfm @ 28"H2O = 520 cfm @ 1.5 inHg

[redchevysport]

Originally Posted by airdeano

Added the TBI Flow Chart

airdeano

Thank you very much sir.

[airdeano]

BBC throttle body post reupped...

airdeano

[Red94Chev]

Here's the correction factor for the 454 TB data:

TB with injectors/injector pod, no air cleaner - 755 cfm @ 28"H2O = 643.3 cfm @ 1.5 inHg
TB with injector/injector pod plus injector pod spacer installed - 765 cfm @ 28"H2O = 651.8 cfm @ 1.5 inHg
TB w/o injectors/injector pod - 790 cfm @ 28"H2O = 673.1 cfm @ 1.5 inHg

The 350 TB has 1 11/16" throttle blades and the 454 TB has 2" throttle blades. If you were to get a Hi-flow 350 unit with 1 13/16" throttle blades, flow should be about 590 cfm w/o the injector pod. This is spot-on to the flow data given from Turbo City with their cfm ratings. I guess this solves the debate of whether the 2-barrel TB uses the 3"Hg or 1.5"Hg standard for airflow measurements. Thanks airdeano.

[fernanbfg1]

I think I am going to scratch the BB and stay with a SB. Will a small block hi flow TBI, with the right injectors and fuel press, be able to support the GMPP 383HT? Maybe even the GMPP
ZZ383?

[airdeano]

what would you give for a 1050cfm (dry) 975cfm (wet)
TBI throttle body, that isnt locked into 35-90lb/hr injectors
you change upto four 155lb/hr injectors, bolt onto a stock
or opened up manifold, use existing TPS and IAC equipment,
and will fit in the same place as the OE TBI?
HUmmmmmmmm????
lemme know what you are looking for in a throttle body?
vortec and genIII peeps same question (sans the injector option)?
i think i have a solution... details to hopefully come in a
couple of months.

airdeano

[fernanbfg1]

Are you talking about a 4 barrel TBI, or adding two additional injectors to a stock TB? Where do you get a hold of 155lb/hr injectors? How much fuel pressure you running?

[airdeano]

this will be a design that fits the OE manifold or modified
manifold.
injectors are available all over the web, pressure will have
to be 43-51psi, easily achivable with a TPI or vortec pump.

airdeano

[oldred95]

Originally Posted by airdeano

this will be a design that fits the OE manifold or modified
manifold.
injectors are available all over the web, pressure will have
to be 43-51psi, easily achivable with a TPI or vortec pump.

airdeano

What kind of power are you thinking this would be capable of making? What about tunability? I'm guessing a mail order chip is way out of the question, am I right?

[airdeano]

big power.. no "low flow" errors, no "i am outta fuel" excuses.
ive got a couple of machining tasks to iron out to possibly
manufacture such a product.
155lb/hr x 2 x .8 / .5 = is 496hp @ 80%dc
will support a:
350 @ 8500rpm
383 @ 8000rpm
350 @ 7000rpm with 12psi boost

airdeano

[oldred95]

This is pretty amazing news. You might just have the cure for all the TBI's major downfalls. Hell you may even get TBI put back into todays production cars and trucks. Way to go deano!!!!!

[BIGRED Z]

hey red94chevy i got my 93 Reg stepside Z71 from Spruce Grove its a custom with 20s it looks kinda like yours but 4wd on 20s with a sunvisor and racerback anyway is a K&N good for these trucks i bought my truck from Fastlane Customs

[evasion4205]

Originally Posted by Boosted-Z71

I did the remove ridge & radius trick on my 87 TBI and the SOP feel was the difference between night & day. I also ground the throttle shafts & polished / smoothed everything in the air path, along with a thick inj pod spacer.

Good test Dean, cant wait to see the results on the modded TBI

Boosted

kinda of confused when you say ridge and radius trick how exactly would you do that

[airdeano]

first youd remove the ridge that surrounds the bores to allow air
flow past the injector pod and the bores.
second would be to radius the entry of the bores after removing
the ridge. this squared edge can imped flow. to improve it more
roll or radius the entry point.

airdeano

[evasion4205]

thanks now how about the injector pod spacing that was mentioned what does that do