TBI AirFlow

[airdeano]

the ridge around the bores is about .160 - .200" tall. like
removing the ridge, will allow more distance between the
injector pod and the bore's edge. raising the pod will again
allow more distance increasing the opening area for air to pass
into the throttle body.

airdeano

[383beast]

Nice post .....I'm just beginning to tune my tbi with my stroker to try to get it to run better!!

[fernanbfg1]

What kind of performance/ driveability issues would inccur if a TBI was put on top of a dual plane (carb) intake with adapter plate, vs. a true TBI intake?

[airdeano]

slim to no issues. this is common for cross platform engines,
swaps, etc...
most use a performer manifold, but one notices a softer low-end
feel as the ports are much larger than the TBI manifold.
throttle linkage issues are a lil hard, but some fabrication of
bracketry fixes that.
ive even seen a victor junior intake with a TBI ontop..

airdeano

[fernanbfg1]

Ok, so using an intake meant for a carb would more likely increase top end and horespower with the larger intake runners?

[fernanbfg1]

Referenced to this thread:

http://www.fullsizechevy.com/forums/...ad.php?t=83738

Would a 50 mm TBI and a TBI intake on top of a 383, be able to come up with the same numbers that vortec stroker put down, 327.4 RWHP
381.1 RWTQ? I know he was using a completely different intake and fuel delivery system, which I used to have and never really enjoyed even with running 10psi on a procharger, (295RWHP, 310RWTQ) but is the TBI capable/tuneable of putting down the same numbers or more?

[91chevZ71]

I ran 260.1 hp with a 50mm tbi, 90 lb inj's at 15 psi, 350HO crate.
intake bored to match. No TB spacer or pod spacer. Using GMPP TBI intake- my next mods are TB spacer, pod spacer, port intake to heads.
I bet it's possible

[airdeano]

Originally Posted by fernanbfg1

Would a 50 mm TBI and a TBI intake on top of a 383, be able to come up with the same numbers that vortec stroker put down, 327.4 RWHP
381.1 RWTQ?

here the differences:
he's port fuel you are TBI
his throttle body meters airflow. fuel is highly atomized through
pressure and orifice
TBI meters airflow, but also restricts flow of fuel through a
low pressure moderatly atomized action.
comparo would be a GMPP RamJET 502/502HP
it uses a 48mm dual bore (TPI/LT1 throttle body) so support is
there, the means of sneaking the fuel through without gross
flowpath disruption is the problem.
the 48mm tb flows moderate numbers as the 50mm was better. noted
on the 54/58mm (TPI/LT1) monster numbers are shown, but again
that fuel spray does displace air and airflow.
air requirement for a 383 @ 4000rpm is: 377cfm @ 85% efficiency
air requirement for a 383 @ 4000rpm is: 443cfm @ 100% efficiency
air requirement for a 383 @ 5000rpm is: 470cfm @ 85% efficiency
air requirement for a 383 @ 5000rpm is: 554cfm @ 100% efficiency
air requirement for a 383 @ 6000rpm is: 565cfm @ 85% efficiency
air requirement for a 383 @ 6000rpm is: 664cfm @ 100% efficiency
air requirement for a 383 @ 7000rpm is: 659cfm @ 85% efficiency
air requirement for a 383 @ 7000rpm is: 775cfm @ 100% efficiency

as for the freakish high rear-wheel numbers for TBI.. and
keep it drivable... nope! constant tuning and tweaking..
and im not sure if NOS would even do it, maybe once.. ka-boom

airdeano

[91chevZ71]

lol

ka boom

[kentonmiles]

they argue alot over there before geting any answers. just a thought i would like to share not to bug you

[boa1277]

Originally Posted by 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

Did this ever happen? This sounds great!

[excellmerg1]

Borla the way to go

[92SierraTBI]

Does anyone know what cfm a 46mm tb would flow with pod spacer installed?

[JadXtreme]

Installing a tbi spacer along with a injector spacer and a velocity stack and maybe long tube headers would be a big plus in power over stock, right? My question is wouldn't this cause lean issues on a stock engine without going into the fuel delivery?

Does my 89 350 have egr, and is there some way to delete it w/o throwing the SES light on?

[92SierraTBI]

It Says You Need To Bump Up Your Fuel Pressure Also Above,your Computer Should Adjust If Thats All You Are Doing,but Its Always A Good Idea To Tune Your Computer,and In The Tune You Can Disable Egr And It Wont Throw A Light.http://www.fullsizechevy.com/forums/...orsepower.html CHECK OUT THIS THREAD

[COMP]

any updates ??