djdsails

so i recently did a 305 to 350 swap. the 350 has 190cc pro comps heads. the cam specs are intake: 203 with .4215" lift. exhaust: 214 with .4425" lift.
Now i put the 305 TBI on top of this, i put the aftermarket equivalent of GM p/n 19110538 injectors in the TBI. i also put a stock ANLU bin that is tuned for 17084327 cop car injectors on the computer.
I have a RICH running engine! according to my BLM tables and the black stains on my exhaust where there were leaks. i didnt expect this. the engine runs really smooth though the whole rpm band idle to 4k, but i know i can get more out of it. i want a drivable street engine, but when i step on it, i want it to go!

So what should my next steps be?

Thanks!

Tuned Performance

iTrader: (92)

For tuning advice you should post in the DIY prom section, You might think about buying the moates.net burn 2 , a few sst 27sf512's and the solder in adapter for the 746 ecm. Start bye slowly decreasing the ve around 30 kpa.

djdsails

ok what about mechanically? What would u or anybody do in this case, with these goals?

Tuned Performance

iTrader: (92)

If you have a exhaust leak bye the o2, bad cts or map or tps you will run rich.
If you are experiencing any jurking while slowing down another good reason to tune and work on the iac.

djdsails

No exhaust leak. Map and cts sensors ok. What I am hinting towards is bored 350 TBI or 454 TBI?

Tuned Performance

iTrader: (92)

I'm not sure what your trying to do ? Are you thinking the larger bore size and opening the throttle blades will lean out the fuel mixture ?

djdsails

Yes. That's what I am thinking. Also I will have more HP output.
Is this train of thought correct?

Tuned Performance

iTrader: (92)

TB- the 4.3, 5.0 and 5.7 TB's are all the same CFM with 1 11/16" bores.
A bored out tb would be 46mm 1 13⁄16in is not worth the cost unless your throttle shaft is worn and you need a replacement option. Off idle the will help a little for the rich condition but at idle you are still going to go for the same target idle speed and the throttle blades being open about the same amount as you have now with the iac controlling the vacuum leak. Is the car going into cl at idle ? If you are spitting out raw fuel out of the tail pipe and sounds like you need to tune to lean it out.

djdsails

Yes it goes into closed loop ar idle, no raw fuel out the back.

So your saying that if I go with the 454 TBI it will lean it out a little and there won't be much of a difference in performance? And I won't lose my low end power and torque (I know I will have to tune, but will this change preserve my power at low end?), but I will have to tune idle?
Is my current TBI holding me back regarding power through out the power band, I know that my 350 can put out more that it is now? Will the 454 help or hurt my power within idle to 5k? I have read that the 454 on a SBC will kill its low end, i don't have a stock motor. I have free flowing intake and heads. What are your thoughts on a 454 on a moded SBC?
Thanks

Tuned Performance

iTrader: (92)

I don't feel like you have enough of a engine to warrant a bigger throttle body. If you had installed a afpr I would say lower your fuel pressure but this sounds like a tuning issue. If you plan on further upgrades larger displacement later on and staying with tbi you might consider dynamic efi ebl.

djdsails

so tell me about this??
http://www.ebay.com/itm/370322499077...84.m1438.l2649

why does he say this (business of course but is there any truth behind it)? why is everybody on this site and others say differently?
quote from description "Will I loose any low end torque or performance? NO!! – absolutely not. Your throttle body is only an air valve – more air means more power, whether at low speed or running flat out. Too much air (or flow) is only an issue w/ carburetors which need high air velocities and vacuum to meter the fuel correctly. Fuel injection motors “inject” fuel and love more air"

Tuned Performance

iTrader: (92)

If thats what you think you need purchase it.

djdsails

That Dosent answer my Q... Of your knowledge and skill, is there any validity to what I posted before??
Thanks

Tuned Performance

iTrader: (92)

Sorry, Im not sure what I was thinking when I posted the mm of a stock throttle body. The tiny 1 11/16 is only 400 cfm @ 3 inHg . If you can get a tight throttle shaft used 7.4L throttle body or a bored out 46mm. You will still need to tune some for idle to lean out the fuel tables. I should stick to tpi lol.

Ronny

iTrader: (1)

I would not rush into a larger TB unit. I would gain some experience tuning the easier of the two(the smaller). Once you have car running great then look at MAP at WOT load. key on engine off MAP value is what you reference to. That is elevation/baro pressure MAP. If you have a MAP WOT with a number say 5 less that KOEO(a restriction) then you can consider a large TB and or large intake runner.

djdsails

Thanks for your reply. Everything makes sense, except what is KOEO?
Thanks

Tuned Performance

iTrader: (92)

Key On Engine Off