ninetyone

iTrader: (2)

A tbi 350? How did you make 279 at the wheel ? So you are saying you were making in excess of 350hp at the crank with a 350 tbi with tbi heads? Doesn't make sense. Sorry, I think you may mean more like 179 hp at the wheel. That would be more realistic.

ninetyone

iTrader: (2)

I have seen healthy 350 TPI's with the better TPI heads and stock cam which is like an Lt1 cam make only 200 hp at the wheel sometimes. What kind of Tbi 350 did you use?

Fast355

iTrader: (2)

Your numbers don't make sense either. I have seen a bone stock Corvette with manual transmission make nearly 230 RWHP on a SD TPI 350 that was rated at 250 hp. Saw a stock SD TPI 305 make right at 200 RWHP as well.

TBI heads are BETTER than the TPI IMO for what we are using them for, especially after porting.

My weak little 305 TBI with a custom chip, high flow cat, and flowmaster muffler was 178/261 to the tires and I had much more drivetrain loss than a thirdgen. The same engine, save for flattop pistons, ported 305 vortecs, 1.6:1 roller rockers, and adjustable timing set to retard the factory peanut roller cam 4* made over 240 RWHP.

I dyno'd a stock stock 350 TBI crate engine for a 1-ton with its sickly 8.75:1 compression ratio and it made 176/261 to the tires with the stock chip. Only changes were the pellet box cat gone and running the 1/2 ton tuning.

Fast355

iTrader: (2)

The same engine with a LT4 production cam, edelbrock 3704 intake, 1" open center TBI spacer, upgraded valve springs, 1.6:1 full roller rockers and a set of doug thorley tri-y headers into a single 3" exhaust made 236/287 on the stock tuning. When tuned it made 253/327 to the tires, this was with the stock compression ratio and stock swirl ports. The same exact engine made 323/327 to the wheels with Vortecs ported/milled/2.05-1.60 valves installed and an edelbrock performer RPM intake with Big Block TBI. Same setup with a custom grind Reed cam and Edelbrock 2bbl victor Jr intake made 365/382 to the wheels. It pushed a heavy G-van to a 14.1 @ 99 with a 3.08 gear and stock stalled 4L60E. I later built a 10.5:1 383 setup using the same cam and modified vortecs, heavy port work on an edelbrock 3817 TPI/Vortec base, siamesed SLP runners, ported plenum, stock TPI throttle body and put down 370/433 TQ. At that point I could no longer keep a 4L60E in it. The complete setup is still parked in the G-van, parked in my driveway. About to get pulled out and put into a 1989 SWB S10. It is poop brown, aka V8 Turd.

Fast355

iTrader: (2)

It is not nearly as hard to make power as you make it out to be. With minimal changes I have a truck that started life running 14.7s @ 92-93 mph and now runs 0-100 in 13.6s. It does not have slicks, no weight reduction, never had the valve covers off, has stock intake and exhaust manifolds, and still has 2 of the factory catalytic converters in place.

ninetyone

iTrader: (2)

THe 305 tbi in thirdgen's was only rated at 170hp at the crank.

ninetyone

iTrader: (2)

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Fast355

iTrader: (2)

I realize that, with wheezy stock exhaust manifolds, tiny restricted Y-pipe, oem air cleaner, crappy stock tune that was too retarded and too much fuel. Also have to remember the engines are NET rated with all the accessories installed and operating.

My second 305 did not start life as a TBI but a Vortec block. It was a .030" over block with flattop pistons and 1/2 point higher compression than a TBI. It did have a stock L03 cam, 1.6:1 full roller rockers, and stock L03 heads on it. Used a stock 350 TBI intake manifold from a 1992 Van and matching 2 1/4" outlet log manifolds into a factory 92' van Y-pipe. The factory pellet box cat was removed for a single 3" random tech cat and the factory muffler replaced with a Flowmaster 40 series single in/dual out into 2 1/4" tail pipes. I ran 16.1 @ 85 mph in the 1/4 with this setup in a 5,300 lbs G-van.

kmcn47

why did i waste the time reading this whole thing? its weird i just felt compelled to keep going i know both my thirdgens so far have been slow lol the v6 definitely felt way faster, then again the carb'd 305 is heavier and not that much faster the way it ran (like ****) when it ran, but that sure didn't stop me from going out and having fun in it, especially in ice or snow and i only lost in the z28 to a bolt on/exhaust 97 z28 but then again i expected too, and i didn't break my serp belt racing (he did, i have v belts too) thirdgens were great in their heyday, now they're the best form of cheap fun cars with potential

89iroc89

I just boughtz a newz 92 gtazzz with 305z and 5spdzz can i haz a race nowz?!!?

88FormulaF_Bomb

iTrader: (1)

sure race anything you want.
but dont expect to beat anything but civics,altimas,and v6 mustangs


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89iroc89

Lol dude, I'm busting your *****.

88FormulaF_Bomb

iTrader: (1)

i know. this was a troll thread from day 1


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88FormulaF_Bomb

iTrader: (1)

reading the raging responses makes the work day go by


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Orr89RocZ

iTrader: (20)

My bolt on L98 hung with ls1 cars that were stockish and also Lt1 cars. It ran low 13's most of the time. My stock ls1 car went 13.4 but an auto 2.73 car, not quite as quick as manuals. But for an old car the L98 was pretty quick. That was 10 yrs ago.

Today things are much faster. 10-12 sec cars stock from factory and family cars goin 14's.

zraffz

Truth be told a 3rd gen is a great platform for the average enthusiast to work on. They handle good, they stop good and with some work they can be fast!

ibmtech

iTrader: (1)

And speaking from experience, The miniram will require tuning and isn't just a plug and play is where alot of people make a mistake.. It does require some tuning.. But, I have learned that anything is possible.

Orr89RocZ

iTrader: (20)

I have seen stock internal L98's with procharger kits turn 114-115 mph traps which is good for high 11's with traction. Lt1's with boost should easily do that and more. Thats not really a dog but for the money you can go faster with cam heads and spray

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Whiskers

My 25th anniversary 92 RS Camaro idles rough ! When u give it some throttle it dies ! Have replaced all sensors except knock sensor ! Replaced fuel pump filter sock fuel regulator diaphram plugs wires fuses relays distributor cap rotor ! Could this be as simple as a bad fuel injector or a ground problem ? Oh yes I have put a new ECM in this thing also ! Any help would be greatly appeeciated

IROCgiraffe

iTrader: (3)

Go back to basics! Check that you have ample fuel pressure. I replaced my fuel pressure diaphram with a new one as it was faulty.

Whiskers

Just did that ! No change !

Whiskers

Just did that and no change !

IROCgiraffe

iTrader: (3)

What pressure reading did you get, with the car running and hot.

kmcn47

Guys maybe I'm being a dick here but this is absolutely the wrong place to be discussing this. Mods can you move this to the appropriate section?

Whiskers

40

Whiskers

Would if I could figure it out ! Site is not so user friendly ! And I'm just your average hillbilly joe ! So just bare with me please ?

kmcn47

https://www.thirdgen.org/forums/v6/
not trying to be a jerk. but the separate boards are moderated by the most knowledgeable people in that section. post you problem there and they should easily be able to help you.

1LE91

A 305 is the reason people think 6 cylinders are fast? No, I've eaten so many 5.0's(old) and 2003ish gt's alive in my 1LE
Maybe you think they're slow because you have those old lady 2.77 gears your car would move faster than a Wells Fargo carriage.
And in my 305(damn near stock) I pulled a high 13 last week and pull low 14's on a regular basis

EDIT: and you make it sound so difficult to get power out of a chevy small block, I don't know why....

PurelyPMD

iTrader: (3)

a pocketful of 14 second time-slips from a car with over 90,000 miles on it.