Bulldog75

There seems to be a lag or delayed reaction when hitting the gas. How to I get faster response time when accelerating? 305 TBI with a drop in air cleaner and 3" pipe straight high flowmaster exhaust

rsmith085

iTrader: (1)

Could be a number of things.

First if the plugs, cap/rotor, fuel filter and wires haven't been replaced in awhile always start there.

TV cable could be out of adjustment not letting it downshift http://www.cpttransmission.com/tech_tvcable.htm explains the procedure better than I can it's been awhile since I've messed with one.

Yes a open element air cleaner makes quite a noticeable difference especially above 3000rpm

The exhaust on these cars sucks pretty bad being a single 2 1/4" pipe but without swapping the manifolds for headers your not going to gain a lot considering the motor doesn't rev very high and the cam is horrible.

The factory tune is pretty bad. It runs the engine quite rich and they don't run very much spark advance you can advance the timing at the distributor to 2 maybe 4 degrees BTDC but you'll need to run 93 and I wouldn't go more than 4 degrees because it'll start to knock at cruising rpm and the computer will pull out timing

The stock gear set is excellent for gas mileage but horrible for performance being an auto their 2.73's. Doing it on the cheap get a posi 3.23 or 3.42 from a fourth gen out the j/y.

Check out all the stickys at the top of this forum there's a ton of info on getting more hp out the TBI

Bulldog75

thanks for the great information.....

ThreeOhFive

Out of curiosity, if you take a 305 RS, throw 3.42's in, 25-2800 stall, and a shift kit, with basic bolt ons such as exhaust and open element, would it be reasonably quick? All that can be done quite cheap.

I had a 1992 RS as my first car, TBI and auto with the 2.73's. It was decently quick, or so it felt, until I got stomped by a 200k mile Grand Am GT, and an old high mileage 350 Tahoe.

I have always wondered what some gears and a tranny would do in these cars. $400 buys you a used rear end and stall, installing both is a cake walk. Is it really that easy to make a respectably quick car, or is the LO3's cam going to make it fall flat on its face?

Ron U.S.M.C.

What you describe above I would consider the basics and is almost the blue print that a lot of us are using.
Ive done most of what you describe(I don't have headers but do have the rest in 3in.) with the timing also bumped to 4*
Its hard to measure apples and oranges so the best comparison I can think of would be what you started with compared to what you have now with whats been modified on the car. Personally I consider my car “much” quicker off the line compared to what it was and it will put you back into the seat enough to lock the seat belts. It gets it when I want it to with barking the tires from 1st to 2nd and chirping them from 2nd to third. It is really all I need for my DD.

For the OP,
Tune up, then bump the timing to around 4* as suggested above. Mine is set there and I get away with running a mid grade fuel,(89)

Bulldog75

THANKS FOR IN THE INPUT

ex-x-fire

Your most likely running alittle lean w/ that open air cleaner (alot more air), you need to be able to adjust your fuel pressure, check out the ultimate tbi mods or do the coin trick.

Bulldog75

Coin trick?

1badeagle

iTrader: (2)

Put a quarter in the fuel pressure regulator so it increases the pressure at the injectors

xstang77

ive never heard of this please explain more?

ex-x-fire

The quarter is for shimming the pressure regulator spring, it makes the fuel pressure up go up slightly.

freaky

you could also add a lt1 cam in it for a ltle more hp fairly cheap . i picked mine up for 50 bucks on ebay

bigreed91

after bumping my fuel pressure up to about 13.5 psi (i believe it was at about 11.5 stock) and adding a tbi spacer my throttle response improved quite a bit. I can't really vouch for a tbi spacer though since i added in conjunction with increasing the fuel pressure but its there. I also have an open element air cleaner and shorty headers so it aint bad off the line.

thomas1976

I would check fuel pressure and timing.