dabird07

iTrader: (10)

Before i get started this is just for 305 tbi and tpis (mainly tbi) dont wanna see anyone gettin bashed for thoughts of a 305 by saying just go to a 350


with that being said

hey to all im just curious on wats the most power u got out of ure 305
if u would include mods list

and price would be nice
thanks!!

(sry if this is already a thread)

one92rs

iTrader: (5)

dog gonnet i cant remember his name but i believe his camaro was white. he made good power. i believe there are a few near if not in the 13;s with a lot of mods. good luck. where the heck is undercovertbi at. he would know.

UnderCover89TBI

iTrader: (25)

I understand you want to keep your 305 but trust me it is not worth it.

Any naturally aspirated engine should be able to get 1.0 hp per cubic inch to 1.5 hp per cubic inch.

now how streetable relies on cam, heads, and stall.

and then you'll never be happy with jus the 305 when you could have went 350 from the beigginng. I am only saying this because I know I am going through it!

go to craigslist, 350 tbi engines on there all day everyday for less than 500 hundred bucks.

I am not going to go thru every mod and price because it'll make me mad. lol.

but i have cam, headers, intake, aluminum heads, forged pistons, pullies, stall, gears and I am only expecting once I am tuned with the EBL to be in the mid 13's at best

pound

iTrader: (7)

I believe there is an old thread in which Fast355 described how he made good power from a heavily modded 305.

dabird07

iTrader: (10)

thanks to all and undercover has been lotz of help to me and i jjust wanna put a ls1 cam and headers have rest of exhaust the a 3.23-.73 gear with posi and meanwhile after thats done work on a 350 while still having fun
i wuz just curios cuz my pops told me about a camero that came out stock 305 in the laate 60s or 70s with 400 horses any else hear this

TXBowTie40

iTrader: (2)

No 305 ever came out stock with that much horsepower.
Best I recall is HOT ROD did a Camaro vs Mustang build up back in the early 80's, and they got a 305 over 400hp, with a Comp Cams 292 Magnum camshaft and some RHS heads. Promptly blew the engine at the dragstrip, but that's what happens when you twist a stock 305 shortblock to 7200rpm. lol

TXBowTie40

iTrader: (2)

Here's a link to that article:

http://www.hioutput.com/tech/400hp/400hp.html

dabird07

iTrader: (10)

lol i think the farthest mine has seen is 4000 lol

to all
wats the most rpms seen??

UnderCover89TBI

iTrader: (25)

with an incorrect tachometer I have seen 6200 RPMs but as my rpm's increaser tachometer gets farther off

WilliamSilver

iTrader: (6)

Which heads there buddddddy?

And yeah, 350 > 305 anyday. If you want to mod the 305 though get parts that can be swapped to a 350 later.

Ive got

EBL
headers
exhaust
Intake manifold
Intake
Nitrous

that can all be swapped over to a 350 no problem with decent gains, so if you DO mod it, be smart about it.

UnderCover89TBI

iTrader: (25)

i have the edelbrock centerbolt heads 80589's I think. I got them used for 350.00 with roller rockers. not bad

dabird07

iTrader: (10)

for a pair??? lucky man! im thinking after i put alil cam (i rember all that research u helped me with underover never got to it found it it be to radical) by used rearend from hawks with 3.23 - 3.73 then have fun with it buy a 350 tpi motor from hawks and work on it

freaky

hhttp://www.fl-thirdgen.org/325-305sbcbuildup.htmlttp://www.hioutput.com/tech/343hp/343hp.html
heres a ouple good reads , also after doing these mods if you wanted to put forged internals in an a turbo you should be in the 500 hp range with good street manners .

UnderCover89TBI

iTrader: (25)

yup for the pair but i put a couple hundred in them before i put them on the car. but i keep my eye on craigslist and try to get good deals

dabird07

iTrader: (10)

i do lol nothing but hondas in my area although i live in dirt track city and they throw away motors after two runs so i might go and try to catch one lol

WilliamSilver

iTrader: (6)

?

show me a street driven 500hp 305 tbi?

Show me a turbocharged 305 tbi?

freaky

what makes you think it would be so tough to do ? if you can get 350 hp out of a 305 then turbo it with a good tune you'll be there .
lets see i had a 400 hp 4 cylinder so why do you think 500 hp 305 would be so hard ?

WilliamSilver

iTrader: (6)

Show me a 500 hp 305 tbi

Show me a turbocharged 305 tbi. Key words here being 305 and tbi

And were not talking about any 4 bangers here I just asked two simple questions. Can you show me those? No

freaky

http://www.theturboforums.com/smf/in...topic=129002.0
heres a good start an my guess is if you dig around on this forum you'll find many more .
have a good day sir .

92firebird 305

well ihave 201.5 hp and 268 tq to the tires on my 305 tbi but im gonna get the engine numbers to make sure its a 305 not a 350 tbi and all i got is 3 inch flowmaster system a chip from tbi chips a 4 inch open element air cleaner with top lid a msd cap rotor coil wires ac delco plugs a crank under drive pulley a corvette servo in tranny it spin the tires in 2nds gear with the 2.73 rearend open about to change that to a 3.42 posi disk rear soon i hope

freaky

92firebird305 thats pretty good for a 305 , if you change the cam an heads you should see a nice improvement .

92firebird 305

i got a lt1 cam for it soon gonna put that in but im also gonna get a tbi intake and a bored out tbi matched with intake to a 2 inch bore i just want 300 hp and over 300 tq

UnderCover89TBI

iTrader: (25)

your better off changing the gears and add a stall converter

torque_is_good

201 to the rear wheels? That's approx 250 fwhp on an auto tranny vehicle

something leads me to believe those aren't swirl port heads on it.

UnderCover89TBI

iTrader: (25)

maybe someone put some vortec's on it or something. but that'd be easy to tell

WilliamSilver

iTrader: (6)

Really that's a turbo tbi making 400-500 hp? All I see is ****ing speculations and NO tbi. Try again. You have A LOT of research to do. You have no idea what goes on when you add forced induction to an engine do you?

Wont even waste time arguing its not worth it.

If you want the most power from your tbi do the basics first. Better the air flow

Intake manifold
heads
headers etc

Better the fuel delivery

Injectors(not a must)
fpr
Pump etc

Forgot suspension helps believe it or not. And brakes as well, stupid to go fast and.not be.able to stop. Stupid droid adds periods.ah

Better torque converter, better gear ratio in the rear end, and a performance oriented ecm like ebl. Those are the basics.

92firebird 305

well to be honest with you i really don tknow if i have a 350 tbi or 305 tbi i have center bolt valve covers tho a buddy of mine is gonna get the numbers off the block so we can find out i live in shalimar fl and i have raced rs camaro and other firebirds and i just blow them away like there where sitin still have they have the 305 tbi one even had the 305 tpi

freaky

actually your the one that doesn't know anything about forced induction . my earlier post already said after you do all the bolt ons anwhat not an have about 350 hp then add a turbo . but your right about one thing this isn't worth my time trying to explain to you how a tbi 305 can make 500 hp .

one92rs

iTrader: (5)

it has been done!!!

http://www.tbi-superchargers.com/

WilliamSilver

iTrader: (6)

Yeah dripped that link in another thread already.

Check out the dyno charts though. And when I emailed the seller he wouldn't send me the bin for it when I purchased the kit

UnderCover89TBI

iTrader: (25)

so your not happy with his customer service then? I didnt see a dyno chart on there. what did it produce on a stock 305?

freaky

williamsilver if you wasn't such a pompass *** somebody might be willing to help you .lol

pound

iTrader: (7)

http://www.tbi-superchargers.com/TBI..._TBI_Kits.html

Scroll all the way down. I must admit that I am not impressed by those numbers. Not all the details of the setup are given though. It only says it was a stock 5.7 TBI with no tuning. Perhaps with tuning it would improve, but I guess you would have to buy one to find out for sure.

torque_is_good

do you really think that is called for? The link shows a dyno sheet putting out a whopping 216RWHP after spending over $2300 just for the kit. And that was a 350 CID engine.

next, why do you think the peak HP is made at around 3500-4000 rpms and then drops to the basement? I own a TBI 305 as well as several other vehicles. It's not the 305 cubic inches which is the problem, it's the induction system, the cam as well as the heads. And that is why I chuckle every time I see a thread about performance and 305 TBI. It's an oxymoron.

You can do some basics to the TBI 305 but once you crack it open, that is when what some call "305 haters" are in fact correct with respect to cost benefits. If you are going to put a new cam, intake and heads then why not use those same exact components on an engine with 45 CID more. Now it's not as simple as just going and getting a hunk of junk 350 like many in forums lead you to believe. Nope, if you are building for performance then you should start with a nice and fresh foundation and that is not a junker engine. So, it's not really cheap to just do it to a 350 like some would lead you to believe but, why spend $2300 just on parts to get to 200 HP on a 305?

This is an old topic which will get emotional just like all the others do (your comment serves as proof)

But, the fact remains that the LO3 is not a performance engine and is a design from the late 70's and produced in the 80's and that was the smog era and no performance.

To buy a stock or pseudo stock 3rd gen and think that you have a high performance vehicle be it the 305 or 350 is just naive in the first place.

UnderCover89TBI

iTrader: (25)

I wish they would show the graph all the way to 5500 rpms instead of 4500 or almost 4500...haha. Well if its a stock engine and the stock hp is shown then it is a nice improvement over stock.

freaky

not that it's any of your bussiness but my comment was directed to him because of our past conversations not the supercharger thing . the op never put a money limit on his question an i do infact believe 500 hp is possible with the right combo of parts an the person i was revering to to wanted to argue with me .so yes it was called for because of his close minded opinions . as for me i'll most likely go with a lt1 when i build mine this summer because it is more cost effective but thats not what the op ask .
an believe me i know this camaro is no hi performance car but it has good potental with nice body lines .i'm just amazed how so many people on here are happy getting there pos turd into thew 14's .but i don't knock anybody for wanting to try an make the most out of there 305 . i feel a turbo is the quickest route to making power thats based on my experience with a turbo'd 4 cylinder . 2.4 liters which is half the size of the 305 an i made an easy 400 hp ( 113 trap in the quarter mile ) so based on some of the links that talk about getting 300+ hp out of a 305 with forged internals an all the bolt ons if you add a turbo then 500 hp is possiable even with a tbi .the argument with him was because he can't find proff it's been done .just because nobody's wasted that kind of money doesn't mean it can't be done .an my comment to him was based on his close minded opinion on my comments an if he talks to everyone this way no wonder this company didn't want to help him .

-AO-

The problem isn't the intake or cam, it's the heads. I ran 13's with the stock LO3 cam. It had L30 heads though.

torque_is_good

the stock cam is a joke. There is no getting around that.

torque_is_good

yes, you could get 500 HP frm 305 cubic inches because that is in essence all that you would be left with in order to do that. Probably actually 310 CID after .030 bore. So, it's really not an LO3 at that point. And, if you are going through all that is required to get there, you may as well use the 45 cid extra and make more power or require less boost. That's the beauty of the SBC, parts are interchangeable.

We were then given a link to a site where for $2300 in parts, we see 216RWHP from a 350 cid engine, not even a 305.

I don't see how that is cost effective. And, to your point of a 2.4 liter 4 banger, if the majority of parts would also fit into a 3 liter 4 banger (that's a big 4 cylinder mind you) then why buy the same EXACT parts and put into 2400cc when for a couple hundred$ more you could put those performance parts into 3 liters? But, that's not how those engines are but is in fact how it is with the SBC.

If you're going to dump money for performance, and are going to do it right including machine work of the old block, then buy a 350 block and get that machined instead.

But, i believe this thread is more in line with what bolt ons were done to get something from the LO3 which is a reasonable question.

I had my LO3 rebuilt, put on hedman shorty's and y pipe, a flowmaster system and an open air cleaner. I also had my 700r4 rebuilt.

So, with those basic bolt ons I can outrun my daughters 4 cylinder Honda Accord. But, I wasn't looking for performance from this car.

torque_is_good

it's a 350 cid engine and why bother showing past 4500 rpms because it falls on its face. The heads can't handle any more.

The kit cost $2300 and then add in any incidentals you might need and you are probabaly near $2500. I would not spend that to get to 216RWHP on a 350 TBI.

robertfrank

iTrader: (27)

Ok I think I need to throw my 2 cents in before this becomes another **** storm like the last few threads I've seen. Can you make good/decent power with a 305 TBI? yes you can. It just takes a touch more ingenuity than others. I can attest to personal experience that with the right combination of parts and wait for it......TUNING it can be made to be a strong performer. Now to play devil's advocate, honestly if you're looking to go faster than 13's or put down more than 200-275 wheel horsepower than get a 350. Seriously. Granted my car now is easily in the 13's but I really wish I hadn't been so damn pigheaded and dumped so much money into this motor, granted everything I have done will transfer over to a larger engine. But to say that a 305 TBI has no performance value is ridiculous, not everybody wants to build a 11 second car.

one92rs

iTrader: (5)

darnit i didnt look down to the bottom. that just sucks. tear out the tbi engine and put in a better one.

WilliamSilver

iTrader: (6)

Tried to put that into words, just couldnt

been working a lot so i havent responded.

The seller on that site said he couldnt send me the bin file or any info on the chip because he does not tune it, after asking what could be done he never responded.

Also, making 216 hp on a 5.7 on a vortec engine i think it was for $2300 is pretty lame to be honest.

Only reason im dropping any money on my LO3 is because its healthy and already in the car. I have a 350 block waiting to be built, which all my parts swap to. Like i said before, be SMART about it. Mod your LO3 with the thought to swap EVERYTHING over to a better/performance built engine.


And you can talk all you want, you saying things like "adding" a turbo shows me you need to do your research. Dont give advice on things you yourself dont know about. (ehh not for your torque, for the guy making stupid comments)


ive listed worthy tbi mods before, from doing my research on here, other boards, on my own TBI and my mechanical knowledge. Ive built a few cars running on forced induction and did it the RIGHT way, not just "adding" a turbo, shoot me a PM if you'd like to learn something.

typing is gay btw, cant get my point or knowledge across through it.



end.

to add to the thread.

LO3 = Economy engine.

Mod it with intent to swap over to an engine thats built with performance in mind. Mine is going with a 350, forged internals, everything i got on my tbi now, with a direct port nitrous system. thats the jist minus the details.

stupid typing

torque_is_good

nobody in this thread has bashed the LO3. If nothing else, there are some who understand it for what it really is.

Now, to your points, decent power is a relative term. A 190HP 4 cylinder Honda Accord might be decent power to some people. 250 FWHP might be decent power to some but not to others. It's about expectations, setting them correctly and knowing what it takes to get there.

with respect to running 13's, you aren't doing that with 200 RWHP. You'll be there with 275 RWHP, sticky tires and a transmission which isn't slipping and that's high 13's

There is nothing to be ashamed of owning an LO3 powered 3rd gen. It's a reliable engine which will give years of service. The 3rd gens are just a victim of their generation. The L98 was the best of them all and i chuckle at that being considered performance in stock trim. But, GM did the best they could given the times (look at Chrysler and the K cars if you want a real good laugh)

It's a shame what the mfr's did in response to the fed mandates. Nothing makes me want to cry more than looking at an L48 under the hood of a 77-79 vette.

So, it tends to be the young uns here who get up in arms and defensive. The 3rd gens were just around during the dark times of automobiles, that seems to be forgotten, or worse, never known. Come on, just because it says Camaro does not mean that they all perform like the LS1 4th gens. 3rd gens are good looking vehicles but in stock trim, not the best performers.

dabird07

iTrader: (10)

not going to lie this thread has blown up with answers to questions i havent even asked good discussion also

yes reason i started this thread is so that i can see how much i could get with two injectors basically

for me this is a learning experience just to see how much i can get from a 305 tbi (keeping it a 305 not messing with the crank and all that) just to do and experience
i two have a lt1 cam bout to go in


and once i put all my parts in for my tbi see what it can do and have fun but i will be going to tpi some time mainly cuz u get more p[ower and looks a whole of alot better but still kepping it with a 305 and good thing about this all if im not happy with it i can easilly get a block (350) and put it in there with all my parts from the 305 excluding some (injectors ecu etc) good argument but was not intended although answered alot of my questions

but heres my next question best torque converter to get?
concerning the turbo on a tbi wat would happen with a tpi (305)???? just curious

UnderCover89TBI

iTrader: (25)

any stall converter is better than no stall converter. I run a vigilante but I got it at a killer price otherwise I wouldnt have it. I ran a summit brand converter for awhile and it seemed to be ok. TCI makes them. But a good stall converter is better than a junky one. Thats why a lot of people on here prefer vigilante, edge, etc. around 2200-2400 RPM stall speed will be suffice.

Apeiron

Better not look at an 80 California Corvette, then.

88fastgta

iTrader: (9)

lol yeah isnt that the only 305 corvette in california only...

WilliamSilver

iTrader: (6)

Underdpver answered your converter question. Still new to these engines but tpi and turbo go together like bread and butter. First your getting a much better aft with the tune port set up and you also have the fueling capabilities to handle the boost the turbo roduces(with some obvious mods if needed, fp larger injectors etc.

Tpi accepts boost well because of its plenum and runner design as well. Just a much better engine especially for forced induction. Still researching on it though.


Sorry typing on my phone

UnderCover89TBI

iTrader: (25)

just for a note switching to a vigilante stall and drag radials gave me 4/10's in the 1/4