Hey guys,
I think I may have come across a pretty good deal. I found a 92 Z28 with the 305 TPI with a 5 speed and was wondering how they compare to a 350 TPI. I am somewhat familiar with TBI, but TPI is new to me, are there going to be many mods available for a 305 as compared to a 350? thanks

 

Yes, you just have to go a little smaller to make sure you have a balanced system. Or you can look at using a "power adder" like a supercharger, which turns it into an entirely different animal.

 

You can do the same types of mods to a 305 as a 350, but I would much rather have a 350. It's easier to make more power when you're starting with a bigger motor to begin with.

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'88 IROC TPI 355, fully balanced, 9.75:1 compression, fully ported '70 truck heads(for now), Harland Sharp Roller Rockers, Comp Cams TPI cam, fully ported '90 speed density TPI with '86 base so it fits older style heads, Crane AFPR, Flowmaster 3in. exhaust, Edelbrock TES headers, all emissions equipment is still intact, plan on burning my own chips, many more mods and parts on the way as time and money permits =(
Best E.T. with TBI 305: 16.11 @ 82mph
Haven't been to track with new motor
Won bracket races at Numidia Raceway with my '70 Nova
In memory of Dale Earnhardt, I'll miss cheering for that black #3 on raceday!!!

 

I've owned both combos: '88 Iroc 350/auto, '89 Iroc 305/5spd. I know for a fact that my 350 was a dog. Not because it was ragged out, but because it was VERY heavy, not to mention the 700R4s are pretty much junk. Unless you have $4000 dollars to have Art Carr build a 700R4, go with the 305. Plus, even with sticking a B&M Megashifter on a 700R4, it still doesn't compare to banging through the gears.

 

305tpi all the way....What gears in the rear?
You'll love 3.45's if that's what they are!

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89 GTA G92
305 TPI WC 5spd w/3.45
Accel Cap & 8mm Taylor's
Custom 4" Cold Air Induction
Jet Airfoil
K&N Airfilter
160 deg stat/fan switch TB Bypass - Steel Rad
Cat back 3" Exhaust w/Terminator Muff.
HiGh FlOw Dynomax Cat
Spohn LCA's - KYB GR-2's
Moroso Crank Bolt and roller pilot bearing.
Autometer Vac+Oil Temp

 

2BALL-Z: How much heavier is a 350 over a 305?

 

well if you get the 350 and spend the 4000 bucks on the "needed" lol tranny, then it will make up the weight difference cause you will have 4000 dollars less in your pocket weighing you down. So at that point it would be pretty even.

 

Huh? 350s are heavier then 305s? They are the exact same dimentions on the outside, just the bore is different really. Why, wouldn't the 350 be lighter simply because the bores are bigger and there is less block? If you are worried about wieght, get aluminum heads. They weight about half what stock iron heads do.

And my 700R4 (although rebuilt for about $1000) is holding up very nicely to my engine... and it isn't stock either.



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1984 z28 w/ a 357 cu in. monster engine which is looking like the posterchild for Edelbrock with the exception of the Holley 750vac... all the suspension stuff... 9-bolt posi disk is in...

-=ICON Motorsports=-

 

No. Some of the things you can do to a 350 are a lot easier to find/ cheaper then for a 305. It is a matter of market size and engine characteristics. There are a lot more options for cylinder heads for a 350 that will not work (compression ratio, valve problems, etc) on a 305. That opens up a whole list of cam shaft profiles that will work better with better heads too. Then gearing/ torque converters and exhaust (though that would bolt up to a 305) to match your cam/head combo.

 

2ball-Z...I think you need to give me whatever you have been smoking. I am very curious to hear what you have to say about what the others have already pointed out.

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-Bill

-=ICON Motorsports=-

Modertor TPI board

Looking for 86/87 Turbo regal
1991 Z28 SOLD

 

Oooh, i know what he's gonna say....5 spds are ligher than a 700...i'll bet you a $ thats his response. Silly guy, T5s are all of about even weight wise with the 700, if you're really worried about the difference in weight, remove the driveshaft protector, then you'll be 100 lbs ahead
...ed
ps. If you remove your driveshaft shield you need to use stage 8 locking driveshaft bolts to make it NHRA legal

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Ed Maher - Moderator @ The Carb Board
92 Z28 Convertible - Quasar blue / Tan top
LB9 4L60 GU2 G80 - stock, soon to be sleeper
-=ICON Motorsports=-

- Definitely prototypes, high powered mutants of some kind. Too weird to live, too cool to die

 

I dunno about the weight, Ed. I've carried my T5 from the car to the bench (trust me, its been a few times) fairly easily, but I wouldnt try it with a 700R4!


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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

Ever picked up a ZF6? My car now weighs more than a Mack truck. The ZF is even heavier than a T56.

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'91 Z28 Blue/Silver ZZ4/ZF6
335.9 rwhp 374.9 rwtorque

 

The T-5 I installed in my friend's car was 105lbs. That is without fluid in it. I don't know what a 700R4 clocks in at, but I bet it is a little more. Probably not as much as one would guess though because of that bulky size of the 700.

 

I bet if 2ball-z jacked that 305 up like a motha it'll be far better than any ol heavy 350




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-Bill

-=ICON Motorsports=-

Modertor TPI board

Looking for 86/87 Turbo regal
1991 Z28 SOLD

 

I forget the specifics, but i rememeber seein the weights of trannies somewhere one time and IIRC the T5 was only ~20-30 lbs lighter than the 700. Don't forget the bell housing, clutch assembly (and the master/slave), and even the flywheel should be heavier than a flexplate. Also IIRC, the T56 is actually a hair heavier than a 700 set-up.
...ed

 

The tech section puts the auto at 102 pounds heavier than the stick. Guess we all should get rid of our "junk" 700R-4's, but mine's never had a hiccup. That 350 must be SO much heavier than a 305...following that logic, maybe I can drop a Honda 4-cylinder in and shave off so much weight I can add 50lbs. of stickers and tint and still roach everyone who has a 350 .

 

The auto equipped car, that is. Ed, you may be right about the individual component weights.

 

i didn't know you needed a high dollars trans with a 350. i had some dumbass at a place named Big Ed's Garage built my trans and it's held up well, other than pulling the threads out where the mount bolts up.

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ICON Motorsports

1st & 3rd

 

As far as 305 / 350.. There may be a weight difference, but that is not what I'm speaking of. Ed Maher: You are completely right, I AM SAYING that the 700R4's are heavier than the T-5's. My current car is my 4th third gen, so its not like I haven't had experience with the slushbox 700R4. My current car in stock form would crush all of my previous 700R4 backed cars. In plain english, I'm simply stating that performance wise, I think a T-5 is best for a street/strip car. Sure, if you are running 10's, you'll need an auto tranny. That's when you go with a transmission built for racing: TH 350/400.

 

So some of you are saying I shoud use a 305 istead of a 350 becouse it wheighs so much more. Wow thats a new one one me. I guess if I built a 400 small block that would realy slow me dowm.

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Mike s

 

92 Z28 auto 3.23 1/4mile 14.3@97
245hp 345tq
92 Z28 5spd 3.42 1/4mile 14.5@95
230hp 300tq

The 92 LB9/5spds were the fastest of that engine.Personally,I like a manual trans slightly better,but I love the 350's torque.The 350/auto is more consistent and is severely flow limited and responds better to mods.If you enjoy driving a stick better, are going to be keeping it basically stock,or dont care about spending alot of money to make it fast go with the 305/5spd.If you want a stoplight terror with slight mods and little money go with the 350.

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1990 Trans Am GTA,Black/Black Leather,350,auto 3.23,Dual Cats,SLP Package,SLP Torque Converter/Shift Kit,Fastchip,GSC's,
G-tech 0-60 5.1 1/4mile 13.6@104
Previous Thirdgen
1986 Camaro IROC-Z

 

The following information I am quoting is from Pontiac Motor Division for 1991 that they filed with the MVMA (Motor Vehicle Manufacturers Association of the United States).

Using a base V6 with an automatic, the following is the weight increase for each engine option (I will ignore the L03 and quote strictly the LB9 and L98:

1) LB9 w/ M39/MK6 (stand) adds 168.1 lbs.
2) LB9 w/ MD8 (automatic) adds 154.8 lbs.
3) L98 w/ MD8 (automatic) adds 164.9 lbs.

Those are the facts.

 

ok i have the l98 in my car with the auto and i like the auto i would rather have a t-56 but funds do not permit at this point. The l98 has way more torque and is a better stop light car. what 305 car is going to run a mid 13 second slip with a stock engine? I tell you get the 350.

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90 IROC l98
last season best corected 13.62 @102
mods
full exhaust, AFPR, pulley, jet stage 1 chip, billet servo, 52mm throttle body, slp runners and some 1.6 RR's and a few other little things.
243 RWHP and 342 RWTQ with hot engine and 90 octain fuel

 

I'll be honest and say that i don't know much about cars. But i am trying to learn. The whole tranny talk is confusing me. Are you saying that the tranny a 305 comes with, 5 speed, wouldn't work if you dropped a 350 in?

 

700R4's can be made quite strong,plus when you get really fast,(10's or faster)an automatic is the way to go..
I've seen 700r4's live easily under 10 second cars...
There can't be that much of a weight diffrence,I'v carried my 700r4 from a truck into my shop,so they aren't that heavy...
A 305 speed density dual cat (z28/formula)could run mid thirteens easily with bolt on's,untouched engine...

As far as the 4th gen tranny goes(4l60E)....its basically an electronic version of the 700r4.....
There are plenty of reasons why any given car runs the way it does,especially with how erratic GM build quality is.....
Sure,a tranny that isn't working properly will effect performance....

 

Sure,you can drop a 350 in a 5speed car....The 5speed was NOT RATED for the 350 's 340lb of torque....
Of course the 5speed is quicker than the automatic...but a stock 5 speed will start to wear out...There is much less driveline shock when using an automatic....

 

You can use the WC T-5 behind a 350 TPI. It's true that it's torque rating is less than a stock L98. It's a fact that my WC T-5 is stock and holding up to a 350 TPI with more torque than stock!

Barry Izold
89 T/A, GTA
Modified 350/T-5

 

first of all i've never had a problem with my 700r4, and secondly, u think that the T-5 is for for a street/strip car? yeah right the T-5's are junk, i'd never trust a T-5 behind any motor with some power, and third...why the hell would u need an automatic of you are running 10's? seems to me u dont know what the hell your talking about



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DropTop 91 Z

 

Oh Boy, Flames!!!

Barry Izold
89 T/A, GTA
Modified 350/T-5

 

Once your car gets to a certain level of power,it is very hard to shift manually and get good e.t.s....that automatic will shift it faster than you ever could,at the right RPM....plus automatics can take more abuse as there is less driveline shock

 

realistically, saying you did everything right, the manual is faster, but technically the auto would. Autos are consitent in their times while manuals could be faster or slower, it all depends. So if you bolt up a auto and manual to identaicall cars, the manual would beat the auto but it might take a few tries untill the human gets the shifting right.

 

camero6sd is right. I started out with my 305 tpi auto loved it but, bent a rod so figured they amount of money to replace the 305 was more than the 350 and more cubes+more power so naturally I wen't with the 350 and mods. now I was getting sick of replacing the 700r4 all the time and I did not have the money to have one built up so I went with the wc t-5. at first the 700r4 was faster but, once I got the shift points down the t-5 would take it every time. and the t-5 is much easer to change in and out. it is not as bulky and it is seperate from the clutch and bell housing.


now the weight factor 305 vs 350 305 might weigh more due to more antifreeze in the block. now this would be very close in weight and would not make any differance you would ever see.

 

I really feel bad for you because of your display of ignorance. First off, I can barely interpret the second to last sentence you wrote. Am I supposed to get hooked on phonics to understand what exactly you are trying to convey? Re-read all of the messages regarding this topic from start to finish. Initially, I thought that the 700R4's were heavier than a T-5, until someone corrected me. That is fine. As far as enjoyment, many people, including myself, like driving a manual better than an automatic. It is true that neither the 700R4 nor the T-5 are known for being the most sturdy of transmissions. Then, I went on to say in a seperate post that if you are going to run quick quarter mile times, an automatic is optimal for consistency. So, next time you want to get smart, you might want to remove your head from your *** before you post another unintelligent message.

 

if your non reading *** can't figure out what it says then maybe u do need hooked on phonics. and i dont recall asking u what u prefer to drive manual or auto cause i really dont care, your just tryin to get off the subject of you not knowin what the hell your talkin about. but hey i dont have a problem with ya, u are just a little irritating to me....and oh im ignorant, yeah i know, but do i care, hell no, u can call me whatever u want, ill prolly agree with ya. but its not botherin me. but oh well im done arguin with ya.



[This message has been edited by Thirdgen91z (edited March 17, 2001).]