just got n lb9 100k miles. what kind of gain would the 373 posi borg warner rear, aluminum drive shaft, cold air, air foil have on it. just want easy cheap power wut esle would compliment this if anything. i no cold air n air foil might not do much wuts ur opinion

 

what gears are in it now?

 

stock 1986 Ta posi

 

That could be a number of different ratios. Well I suppose it doesn't matter its probably a high gear. My guess is you'll see an increase in off the line power but not tons. My first 86 Z28 just seemed like a dog after going from 3.23s to 3.73s, go figure. But all things considered its a good start. What are your plans with the car?

 

its gonna be my daily driver so im lookin for reasonable gas mileage and some more hp. later 350 swap but thats later down the line i already have the rear n driveshaft. any more simple things i can do. any bottle necks in the lb9?

 

Well the exhaust is the next place I'd go. Headers, cat and, cat back. If you are going to change to a 350 then keep in mind they breath more. A 305 will benifit from smaller primary tubes and collectors. The larger exhaust can cut low end torque on a 305. When you get to a 350 think about intake mods.

 

slap some 1.6 roller rockers on there

port out the upper pleneum

nice shift kit and trans cooller in the 700

 

Is it automatic?

 

yes

 

1.6 roller rockers are nice, but all you need is the roller tipped rockers which are cheaper but get the same accomplished. but for the price the results arent gonna be noticeable on the street.

i suggest getting headers, downpipe, and a catback system. it wont only pickup some speed, itll sound alittle meaner too. also what i suggest is a good shift kit for your tranny, from what i hear the way to go is to get the transgo brand shift kit, as opposed to the b&m. also there was a thread on here not so long ago about this little 6 dollar piece you can put on your trannys tv cable to get some firmer shifts, and for the price you cant beat it.

also think about going over all the basics, ignition, sparkplugs, wires, iacv. just to make sure your cars running tip top shape.

 

150 shot of N2O..... or read the tech articles on the homepage,, a few free mods... airfoil is useless, bump your timing up to 10-13 deg advanced, run the motor until operating temp then hold at 2000rpm remove the intake tube and spray a can of throttle body/ carb cleaner in it while moving the throttle blades. Exhaust is def the way to go and after that port the intake, then (or at the same time) port heads and slap in a cam... dont mess with the ignition its good from the factory, dont replace throttle body,48mm will feed anything under 450hp, the absolut best bang for the buck would be a transgo shift kit..IMO.

 

thanks i found this very useful also wut kinda rear is in it stock (says performance suspension on passenger dash if that means anythingcause i have a spare 9bolt heard their rare if it has like 277s im thinking the 9bolt would wake it up

 

You can check your RPO codes to find out what gears you have, but if you want to have somewhat of a decent fuel economy don't go higher than 3.42.
Other than that without getting into the motor do a full exhaust and a bit of intake porting and port matching. Upgrade the ignition a bit with an msd coil, better cap, rotor wires. When you do the intake, you may want to get rid of the stock injectors and go with some bosch design 3s from FIC. You may also want to have the car properly tuned. Even a stock car can benefit from a good computer tune. That should wake the car up a little bit without touching the cam and the heads.

 

rpo says ws6 277s posi . also my dad said he can make it chirp every gear if i wanted wouldn't this be like a shift kit

 

I guess a shift kit is going to give you firmer shifts. However, I don't know if that would be necessary if you want to keep the car a daily driver. If I were you, I would put that money into the suspension and brakes. Do the exhaust, a little bit of intake work, suspension and brakes. This way you will have a good handling and fuel efficient LB9 with a bit of pep. Just my .

 

,,, however on the subject of shiftkits its all in the company who makes it. B&M is garbage that only increases line pressure for the most part, itll hit gears hard on light,partial or heavy throttle. A Transgo shift kit will actually make light throttle shifts smoother and full throttle shifts firmer. It corrects several problems known to be associated with the 700r4 including early shifts.

 

i dont see why i would get a shift kit when my pops said he can make it shift harder he has been a certified mechanic for 25 years also, idk why i would put money in the suspension when it has a ws6 and i have a spare 9 bolt rear.

 

My old man is a long time mechanic also and he dosent use shift kits at all, simply strategically placed ball bearings. Maybe this is what you dad is referring to also. The guys at the local trans shop also usually do this and have heard it from a few other trans guys around town. I dont know how exactly its done though never had a automatic trans apart.

i agree that your suspension can probably wait if its in good overall shape and this is just a driver for you. I would invest in the exhaust first! Headers, 3" Y-pipe and mid pipe (like LB9 5spds and 350's) backed up with a good after-cat. Next move onto getting some cold air! Especially with the firebirds and TA's, Air intake improvements are a must. However unless you can still find a SLP cold air (which just went out of production recently) no one makes a cold air for our cars anymore so you may have to get creative. And dont waste your money on an ebay intake or usually anything chrome with blue band clamps, they just suck hot air and look way out of place.

With these mods youll have more air coming in and more exhaust going out, so now would be a good time to add more fuel/timing to take advantage of this. These mods will knock some good tenths off at the track and can also be transferred to a 350 down the road!

 

stock suspension lcas, panhardbar,and 100k shocks n struts are garbage, and the front brakes are a joke. There both a good place to put money into. I also have a friend of the family who has been a ase mech for 20+ years who said "ill do your trans", that thing was banging gears all the time and I hated it. Maybe youll have better luck. Either way there are alot of good posts here on modding your lb9, more than enogh where you could have searched and not had to start a thread, but alot of good suggestions on these posts also. Enjoy the car and keep us posted on your progress and decisions. Also def do the aluminum driveshaft its a great upgrade.

 

YOU ARE WRONG! A stock 145 hp LG4 might benifit best from small primary headers, but a TPI just the oppositei is true. The TPI was designed to boost the volumetric efficiency to provide 350 like torque. This means a TPI engine will always like a larger header than a comparable small block. I have found the 305 TPI most responsive to 1 3/4" primaries and dual 3" into 3.5" single exhaust. It sounds massive, but it WORKS and runs HARD at ALL rpm. A 305 definately responds to intake mods as well. I would probably keep the stock runners or go with oversize long tube runners, but the base and plenum could stand some cleaning and porting. Stock throttle body is fine for a 305. The 1986 has the peanut cam in it and its tiny. You could put a 204/214 grind cam in it and gain an easy 30-40 hp! A modern grind cam could easily add more than that.

 

30 hp from cam itself if so woooooow

 

Well, when you base specs are 179/194 @ .050, .350/.385" lift, on a 109* LSA, there is MUCH to be gained. That cam was designed for a heavy car running 3 speed automatic transmissions with tall tall axle ratios, not a sleek modern sports car with good gearing and better transmission gear ratios. The only loss of torque I experience with even the cheapy 204/214 grind was under 1,500 rpm. Below 1,500 rpm with the TCC locked it lagged a little, but touch the gas, converter unlocks, and it woke right up. Once I hit the mid-range it was hold on and it just kept pulling, even past 5,000 rpm.