So, I'm new to this whole posting a thread deal so excuse the errors please. I've just purchased a 1991 Gta and it has a 305. I know, thats weak. I was hoping for the 350 so that way i'd be packing a little bit more power but o well. I'm more of a carb. guy so I know more about old school engines. I'm not too familiar with the TPI and was hoping someone had advice as to what I can do to the engine that would get me some good hp. and tq.

 

https://www.thirdgen.org/newdesign/tech/ has an article on bypassing the coolant that goes into your intake plenum, so your air doesn't get heated by the coolant. you might be interested in that.

there's also porting the plenum, not sure how effective that is.

you've atleast got a V8

 

Injector size, intake plenum/runners, etc.

It is like a carb engine, but more expensive.

I do not know what type of car you have, but the factory did not put 350's in a 5-speed manual or t-top vehicles.
The torque ate up the trannys and the t-top frame can not handle the torque without strengthening up the frame.

Do you want more torque or horsepower?

shorter runners give you more hp
longer runners give you more torque
A larger pound injector helps, but you have to get an adjustable regulator

What kind of driving do you intend to do?

With the cost involved in upgrades, be specific the first time

Cams are more expensive. they are roller cams
Performance chips
A less restrictive filter to intake helps
'91's do not have the mass air flow to deal with - that is a plus!

There is so much you can do.

I too appreciate a carb over Fuel injection, when it comes to cost

I have a '91 GTA hardtop with the 350 TPI
I also have a '84 TA with a 305 carb

The torque that the L98 is OK for what I need.
The new cam and exhaust will help increase the torque
but I will optimize that torque with transmission upgrades as well.

It is all in what you want your car to do, then tweak your upgrades
to fit what you want

 

Thanks, I've just done the throttle body bypass and seems to have helped the throttle respond better. Also I cut the stock filter box and it sounds pretty cool and is suppose to help. Who knows. I was curious about gears and a shift kit? This car has the most shittest shifts ever. it red lines real bad and then finally pops into the next gear after letting off. The shifts feel real sluggish so i was hoping a B&M shift kit would help cut some of that off.
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I'm looking for more of hp. I want it to be a street car to cruise around with, but yet have enough ***** to tear a new GT up.

 

welcome to the boards! Its not too hard to make our cars fast but GT fast....havent even pondered that lol atleast for my budget now

Keep in mind more power equals a need for stronger trans components and a stiffer suspension, with subframe connectors etc, our cars have the worst frame twist ive seen on any car lol THe t5 will be destroyed if you put too much power thru it, alot of people are going T56 out of the 4th gens because they can hold the power plus i mean who wouldnt want a 6 speed in their fbody?

Another way for you to get some good power would be to beef up the rear, help you put the ponies to the ground get like a LS differential with a good set of gears, youll get goin pretty quick

For the more tech savy there's PROM tuning (same as a mod chip for new cars) basically but you adjust the settings yourself and burn your own chip

Other than that its like older motors, machine them out, upgrade the internals, new cam, set of roller rockers etc.

Apparently the plenum porting job can yeild some good results

good luck!

 

It sounds like you need to get your Throttle Valve (TV) cable adjusted to fix your shifting quick before you possibly damage something by driving it that way.

 

 

Thanks a lot. Does anyone know what the car would be running or have a idea of the 1/4 mile time with a full exhaust hooker headers, nitto drag radials, K&N air filter, Ram air hood thats functional, 3.73 gears, and B&M shift kit?

 

Get shorty headers and bigger exhaust(take the cats out if you live in the non-pollution reg states)
How many miles/year are you driving? Nitto's are expensive if you drive alot of miles(you'll wear out a set in a year)
K&N filter(good 1st mod)
Ram air hood(don't waste your money) it'll run you about $1200 and only give you 20hp(if you're lucky)
3.73 gears with a stockish TPI is too much(go with 3.42's)
B&M shift kit? Get a better quaility one like a Trans-go.

I had the exact same set-up as you(when I started).
I was doing 15.8 in the 1/4.
By the end of my 305 days, I could do a 14.1 in the 1/4(cam, shorty headers, ported tpi, 2400 stall,3.42 gears), with nitrous I was 12.9 or so.

Good luck!

 

The hood was a gimme, I have a chance to buy it for $150 from a friend who doesnt want it. The 3.73's were also given to me for free. So would putting them on at least make a difference? Also can you send a trans-go link. I've tried going to the site and it just wont load properly.

 

Here is a link
http://www.transgo.com/

Good deal for a ram air hood!

3.73's on a stock tpi might help, but you'll run out of gear really quick.

 

alright thanks. Would a auto transmission from a 4th gen fit in my car? Also would 3.42's from a 4th gen fit?

 

Early 4th gen cars have the 700r4(except thy call them a 4L60). I think 93's have it.
After that, they went to a 4L60E, which means electronic shift, I dont think you can put those in.

As for the 3.42's from a 4th gen. You have a 7.625 gm 10 bolt. I believe that the 4th gens used them too, from 93-99?.

Anyone else confirm?

 

correct, which is why everyone steals the zexel torsens for our cars lol

You can fit any 4th gen gearset/ carrier in our cars you just have the have the proper carrier for the proper ring and pinion set (ie series 2 carriers with 2.73's and series 3 carriers with 3.23 etc) oh and make sure you have the right spline axles for the carrier, i think 4th gens used 28 spline shafts wereas up until 89 ours had 26 splines (dont quote me on that)

 

You can drop a 4l60e in a Third Gen. It is identical to the 700r4 except for the electronic controls. If you don't have a 4th gen ecm or an aftermarket stand alone tranny electronic box, your 4l60e becomes a 700r4. If you install a 4l60e, you would be wise to get the electronic box. TCI makes one, there may be other companies making them. The problem with the 700r4 is that you need more hydraulic pressure for the 3-4 clutch pack than you do for the 1-2 clutch pack. If you set up a 700r4 with enough pressure for the 3-4, you can't get off the line without slamming you into the seat HARD with every shift to second and you can't leave from a stop without barking the tires. If the 700r4 is set up for a comfortable 1-2 shift, the clutches slip a little in the 3-4 shift. The stand alone box + a 4l60e will increase the pressure when the trans goes into 3rd or 4th gear while keeping a lower pressure for the 1-2 shifts.

 

Thanks for all the info. I have the whole rearend off a 98 Z. i was hoping to get a whole drive train. if not get a Lt1 thats pumping some big ones for the future. the 305 is just a geter around engine.

 

you could just put that rear on your car, makes the tires stick out a bit more though

looks sick with the right car