va454ss

iTrader: (1)

Anyone recognize this?

ShiftyCapone

iTrader: (7)

I will be Vanna White

ShiftyCapone

iTrader: (7)

Things I see.

External FP regulator
TBI spacer
TBI adapter
Two stud air cleaner
Injector caps with concealed wire harness???
No EGR


Is this in a truck?

dimented24x7

iTrader: (2)

Doesnt look stock, thats for sure. VA, is this your truck?

va454ss

iTrader: (1)

Nope, and yep

dimented24x7

iTrader: (2)

When I first saw it I was like: 'wow, those SBC heads look really big.' Nice looking setup, BTW.

yt500pmd

where did you get the caps for the tops of the injectors?

va454ss

iTrader: (1)

Look at the pic again.

Don't the caps look a lot like the injector pod underneath them?

Z28GEN3

thats clever, it hides those ugly wires.

91RedFirebird

so how do you get the fuel that goes up back down?

dimented24x7

iTrader: (2)

Where are you reffering to in regards to the fuel?

va454ss

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I beat it into submission

Seriously, not sure what you're asking

TrevorH454

May be thinking heat-shrinked injector wiring is fuel line?

JPrevost

I see a bigger TBI bore than 2", what is that? Also I see the Holley TBI adaptor, did you have to hog it out to get the larger TBI to fit?
Why the external FPR and what fuel pressure/injectors are you running?
Those are nifty wiring covers, lol.
A friend of mine has a 454ss with edelbrock TBI intake, increased fuel pressure, headers, and sticky tires. He's in the 13's now that I tuned him a new chip. We're looking for 13.7's with some more tuning (it's too rich low and mid, tad lean above 4000rpm). We also haven't optimized the timing tables at ALL. I don't think we'll find an amazing amount of power but I think there's enough to gain 3 more mph and get it to go over 100mph in the 1/4. I love working with these BBC TBI's, it's the 2nd one I've gotten to play with. If I didn't have to worry about gas milage I'd be all over that motor, dual TBI, cam, heads, turbo, hehe.

va454ss

iTrader: (1)

2.2"

Yes. The 1" phenolic spacer and adapter were machined along with the TB.

Couldn't find an internal reg that would allow me 33 idle/41 WOT psi. Stock 454 injectors. Plus, easier adjustments

Thanks

JPrevost

That's a lot of fuel pressure. I bet you could get away with only 30psi WOT. I dont' know where your redline is but in general the bbc doesn't rev as high and this is good for the injectors. More avail time to flow fuel . We're only running 18psi right now and he's trapping at almost 98mph . We'll be turning the pressure up to 24 and leaving it there, believe this or not but he's still got the stock cam in it. I'm rather impressed with our results so far but if we do a cam swap I'd want it in the 12's with a stock 2" TBI .

va454ss

iTrader: (1)

Yeah, I could get away with less fuel pressure. I'm trying to see what I can get away with.

What heads is your buddy running?

My cam is rated to 5200.

What CR? I installed the 781's without milling and still have the stock 7.8 CR.

BTW, I trapped 99.9 mph with 18 psi.

The big difference is the intake. With the 3764, you are restricted to around 4700.

I didn't have a chance to sort everything out before the season ended. I believe my truck is capable of 12's.

JPrevost

What I didn't list he hasn't touched. It's a 90' and everything (heads and cam also) are stock. Trans is stock, interior, no frills just exhaust work and an intake manifold . Is stock compression really only 7.8? I would have thought 8.5 at the least, 7.8 is like late 70's compression.

va454ss

iTrader: (1)

I'm impressed Yes, that's stock CR. Stock steel wheels?

BTW, the 13.34 I ran was with the stock wheels, fiberglass bedcover, and bedliner. My engine has never been freshened up either.

JPrevost

I take it back, just remembered how hard it shifted... it has a shift kit.
Are you still using the 8747 or have you moved to the 7747, I forget if you told me already, lol. Don't take offence, I get a LOT of people asking me questions that I loose track with anything older than a week.
He's looking to get a cover for the back. Right now gas milage is like BLAH, he doesn't even want to tell me, haha.

va454ss

iTrader: (1)

7060.

Are you sure it has stock cam?

OK. Reread your post. Says looking for 13.7's

heavychevy454ss

:nono: I haven't made it to the track yet, but I've turned mine to 6000+. It felt like it pulls strong to abour 5500.

If I can ever get my tranny fixed I'll let you know.

va454ss

iTrader: (1)

The buttometer isn't accurate. Mine was faster shifting at 4700 instead of 5000 or above at the track.

Sure, I could wind it tighter, but it made it slower

vincentblack

The buttometer isn't accurate? damnit.. that's disappointing, <grin>...
Seriously, hey to the 454ss guys. I came over here to learn about hacking the crap outta the fi on my truck.

7Point4

Seems like more and more of us 454 guys are figuring out that there is more performance to be had with the TBI than some suggest.

And thats good.



This is a good information resource.

Dominic Sorresso

Jon,

I ran the 1/4 at 13.65@101.9 using 10.5psi on my 80# injectors.

JPrevost

If my calculations are correct that's a sure sign of fuel starvation. The fuel you had to make power was limited and you can only extract so much power out of so much fuel... definatly needed more fuel pressure if that's the best trap speed for your setup. I'd like to hear what she runs with the new fuel pressure setting. It's amazing how hard it is to tune TBI well. No wonder so many people go port injection.

Dominic Sorresso

Jon,

Np question of that. You could see the AFR climb to 14:1 on dyno runs I did. Fortunately, no loud BOOOMMM! That ET and Trap were with my old cam too. I just tuned my motor for 19psi and it really seems pretty happy there. With the WB O2, AFR is pretty steady at 12.4-12.6 from 3200rpm up to about 5400rpm.

JPrevost

I want to see some dyno numbers now that the fueling is fixed. Was there a noticable difference in the exhaust tone?

Dominic Sorresso

I'd like to do that in the next few months, possibly in preparation for an early spring visit to the drag strip. That 13.65 was with the 4+3 trans, street tires at 35psi, and a D36 3.07 rear.
As for the exhaust note, at part throttle cruise the motor is quiet with a very steady drumming of the exhaust seeming to come from several feet behind the car. I took it out last night and I couldn't perceive any difference in the engine note from 3000rpm up to 5600rpm. Frequency obviously changed but not the pitch or amplitude. The buildup of revs sounded very consistent throughout. The acceleration didn't seem to change very much or peak out. I remember thinking how damn good the motor sounded both going up the gears and at full rev. It has a bit of a "raspiness" to it that it didn't seem to have before. Sort of a rrrrraaaaaaaaapppppp.

Gunny Highway

iTrader: (1)

What about going to thinner head gaskets to get a better CR out of it?

90RS305

I know I'm coming into this WAY late, but I still gotta rep the 454tbi!

(94' Suburban )

Cadillac

That two stud air cleaner assembly... will that work on my Rochester TBI or is that strictly a truck thing. My air cleaner stud running through my K&N is getting stripped. GM doesn't distribute these anymore and junk yard runs are fewer and farther between these days.

Curious,

C

Benm109

I think you can use the dual stud set-up on our cars if you want. If you look closely, you'll notice that the studs just attach to the two rear-ward bolts that attach the TBI unit to the intake manifold. I haven't seen it done on our cars, yet, though.

Have you tried running a die on the air cleaner stud, just to see if that will help?

Cadillac

Huh? Whut dat?

Benm109

A die, as in a tap and die set, it's what you use to recut damaged or stripped threads. They look like this:

va454ss

iTrader: (1)

The trucks used both the single and dual studs. Mine originally had the single stud, but I converted it to get the stud out of the airstream.

Also, I needed to convert it over to the 2 studs to mount the Vortech hat that will eventually be installed.

90RS305

Thats a nice lookin' set! And yeah, I've got one, those things are a huge help. You'd be supprised how much you will use it...