Hey guys, well, just got busted by a 5.0 notchback. Its getting pretty old. My car is slow to say the least. I am building up a 350, but in the mean time..... what can I do> I have a flowmaster, hollow cat, dual snorkel air cleaner and K&n filter. I think my computer is being weird., I have mad bog, feels very sluggish. What can I do. Fresh oil change, plugs, wires, alt, batt, cap rotor..... Whats up. i know this car can doa little better with the 305 for the time being. ANy help at all guys? Carb was rebuilt a year ago. WHats causing this bog effect? Thanks guys

Will

 

Just wanted to mention that I know some headers/ a better intake manifold and also heads would do some magic, I just wanna know if there are any tuning secrets I can use? I know my car has some tuning issues. If I can get rid of the hesistation, I think it would perform a little better. The headers and stuff are going on the 350. Thanks guys

Will

 

with that 305.. not a whole lot. *not bashing 305's* if u r building a 350 u may want to look for a 75 shot nitrous kit. as far as what to do till then.. i suggest not to race.

 

No disrespect, but I wonder why your car only runs 16.5? I had an LG4 5 speed 86' IROC a few years ago. It had a reman 305, edelbrock intake and carb, 3.73's, L98 manifolds - y-pipe - & cat back w/ a flowmaster muffler. On radials I was running 15.20's @ 90-91 MPH. Granted I didn't have any computer crap, but still... it confuses me. My car was very low option too, it had t-tops, IROC package, rear discs, fog lights, AC. It didn't even come with a tape deck, just an AM/FM radio. I'm sure it's been beaten to death before, but I believe when you gut the cat you need to richen the carb up some with better hangers - not sure if you've done that or not. The only other thing I can suggest is to put some of the easy to install parts that are destined for your 350 on the 305 for now.

 

I dont know a whole lot about how closely the carb modles react as compared to TPI but I know the TPI modles have mad low end torque, so if your bogging off the line then you prolly have somehting wrong.

 

Just a qwick question:

Are you running factory timing?

 

Hooked on phonics worked for me

86 IROC is right, that car should run way better than it does. A tune up would be the first thing on my list.

 

I had a complete tune-up about a few months ago. Plugs, wires, cap, rotor, have changed many swtiches, rebuilt the carba year ago..... I just don't get it. I too know it should do a little better than that. My car has been running lean, and I will take care of the tomorrow. My A/F gauge has read lean since the cat was hollowed.

Cody, to the best of my knowledge, it is stock timing. I have had it for 2 years and never messed with that, and the previoud owner was a female who owned it from 86 as a daily driver, the car was 100% stock when I got it. I was gonna look into that tomorrow too. What should I set it at?

This car just feels like crap. It bogs off the line. Even after being warmed up for a long drive it will still hesistate. Not as bad as before, It used to almost die when I romped on it.

Also, now that the cat is hollow, I can hear the air injection pump whine really loud, its annoying as ****. Thats something I did not anticipate. Also, no matter what I do, my car is really odd sounding. The first thing I ever did was a crossflow flowmaster with 2.5 " pipes and 3" tips. You could not even tell I had one. Then I got a cutout, till pretty quiet. Guys would say so you finnaly got a flowmaster eh?!?!? With a gutted cat and cutout open, its crazy loud, but with it closed, its a real straight through sound, like nothing comes out. Very odd, it flows a little better now with the hollow cat, but nothing like I would have expected.

Any ideas? I baby this car. Only premium fuel, oil every 2500 miles. carb cleaner every few tanks.... this thing should pur. My friends 89 RS L03 used to spank me. Even though he did have posi, I should have at least kept up or put up a good fight in the 1/4. Its not like I go around picking fights I know I am gona lose, but on the highway, in my power band already, I would think I have some chance.

And to annswer Rumblin 91, I have approx 245 ft lb. of torque. Once it gets going, you can feel it, because 2nd gear is crap. 1st is the only gear that really has any punch. The response time is horrible.

Thanks guys, I appreciate it....


Will

 

Will,

Go to www.thirdgen.org and print the Tech Article on tuning QJets. Do EVERYTHING it says.

There are two possible reasons you are bogging off the line. You don't have enough fuel in the mix and/or your fuel is too hard to ignite.

Contrary to some popular misconceptions, running 92 octane fuel in an engine only requiring 87 octane will not make that engine run well. It is harder to spark and just a total waste of money on an LG4. You WILL run better on 87 octane.

 

On my 86 Trans Am LG4 5 speed, I changed the carb and intake and got at least 50hp, but since you are in california and have all those smog test and what not, you have to go with a smog legal setup.
I was running an Edelbrock 1406 carb and Edelbrock 7101 Intake.
Best I got was 14.94 @ 91.67.
Here are a bunch of vids of me at the track and on the street,
Videos

 

Hey guys, well the reason I run 91 is because my car like to knock and ping under hard acceleration or a load. Taking a hill on the coast highway around here, it pibgs alot on lower octane. I have NEVER run 87 in her. On 89 she didn't run too well. i find that 91 is alright, but it would be nice to have some more powerful fuel. Cali fuel sucks, all these save the trees and environmentally friendly fuel additives and substitutes make for now power. I think the slap the 91 label on, but all they have is 87.
But anyway. Thanks for the tips. I have long wanted to get better metering rods for the q-jet. I will be doing some tweaks this week! THanks all and Merry Christmas!!!

Will

 

Get a tank full of 87 octane and then retard your timing until it stops knocking. Your initial timing is just too far advanced for the engine.

91 octane is HARD to spark without the right compression.

You need to reprogram your computer's spark curves in order to get optimal performance.

Headers are your next investment. They will add a good 30 hp to an LG4.

 

His engine should be 9.5:1 compression, which isn't low and isn't too high either.
I had to run mid or high grade in my car otherwise it would diesel when I shut the car off and ping when I got on it hard.

 

a friend of mine has a 92 s-10 with a 2.8L 5speed and he use to use 87 all the time. well 1 day he put in 91 and he said he actually got better gas milage *picked up 3-4 more mpg* and when he pushed the petal to the floor the truck actually had some umph to it vs slowly accelerting as well as he was able to see above the 3k line *well prob around 3200'ish* in 5th gear were as with 87 he would be right below the 3k line. so who knows.. lol.. i use 1/3 110 oct and 2/3 91

 

Well I have a LG4/5spd in a 85 Z28 and beat a 5.0 (story in my site in sig) But my timming is set at 13* I only run 91 oct. I also have an accel coil wires and plugs cap and rotor and a K&N 14X3 filter but I have headers and a mild cam I ran 13.4 on a .4km road I don`t know how close that is to a 1/4mile but I think it`ll run about 14-15 in the 1/4 mile

rich it out bump your timming to about 8* and make sure your secondary`s are opening