Alright heres the deal Im in high school and dont have enough money to or resources to drop in a fully modded 350. Id like to see mid fourteens maybe high 13s with my 305 isnt that capable? from what Ive read on this site it is. I have the lb9 engine made for the 89 t/a. heres what Ive done accel wires, accel coil, 52 mm tb with airfoil, tb bypass, k&n filter, new alternator, radiator, distributor cap and rotor, 1 3/4 headers, 3 inch y pipe, high flow cat, electric cutout, borla muffler with 2.5 homeade pipe. Im lookin to do new injectors (what size can i put on without tuning prom?) want to port the plenum and base maybe a new chip or burned prom I have 3.23 Im pretty sure cause it has the posi already want to put shift kit on and a new torque converter also a ram air hood with the airbox. What else do I need to do is this enough. Please use specifics and I will post results thanks yall

Jason

 

Cam/Heads and lower (numerically higher) rear end gears.

 

i am hopin to tickle the 13s with the setup in my sig. basically you need....

fully ported stock intake.
ported stock heads, or vortec heads, or SR torquer heads, or L98 Vette heads
more cam
good torque converter and shift kit.

your stock gears are ok

by the way your headers are too big and so is your throttle body. a 305 only needs teh stock 48mm piece. and 1 5/8" headers are better for a 305.

 

take it to the track 1st, then let us know what you run.
have you done any suspension mods?
sfc's and LCA's should be on your list.

 

nope no suspension mods, came stock with "performance suspension" if that counts for anything and I got the new tb b/c I am going to port the rest of the intake plenum and manifold, also the 1 3/4 bc when I do get the funds later on to upgrade engine those would fit just fine.

Jason

 

see sig for mods.Ran a 13.909 at Atco,N.J.

 

Actually your car sounds about identical to mine (well, from the factory..you have more mods). You don't have 3.23 gears unless they were swapped in by someone. Stock, your car should have a 2.73 posi rear end. The "performance suspension" is the WS6 package that includes a 36mm front swaybar and 23/24mm rear swaybar (I don't remember which). It also includes upgraded WS6 springs, and possibly shocks/struts, but I don't remember for sure. We don't get SFC's or any special LCA's or anything else with that package unfortunately. SFC's are the first suspension mod I'll be doing to my car, probably followed by LCA's and relocation brackets before winter to hopefully help the dismal winter traction for the (hopefully little) time I drive the car in the winter. I also have hte JG1 aluminum driveshaft option which is pretty cool.

Anyways, as for performance...I'm going to be swapping an LT1 intake onto my stock LB9 in the next few weeks and I'll be throwing on my 3" SLP cat-back one of these days as well as a K&N (when I get the LT1 intake on as well). Once I'm all ready for the LT1 intake swap, I'll dyno my car before and after to give people an idea what an internally-stock LB9 will get from the swap. Also, a shift kit is in the plans soon enough and hopefully a 4th gen rear with either the 3.23 posi disc rear or 3.42 posi disc rear to replace my 2.73 posi drum rear.

Oh and one other thing you might want to do on your car if you are opening it up to breathe so much is put a 3" cat-back on it instead of your 2.5". No point in having 1.75" headers if you are just using a 2.5" exhaust system. Also as mentioned, the 52mm tb does nothing for performance until you are over probably 375-400hp

 

well Im hopin for an engine swap someday so Im currently doin all the bolt ons or other things that could transfer over to a larger engine, that way when I have the money for a GOOD engine itll all be done.

Jason

 

Plenty of ways you could go about this, it all depends what you are after in terms of mods. You can take the route of all bolt-on's, and not have to crack open the valve covers, or you can go a little easier route possibly by upgrading cam and heads.

From the sound of things, it seems like you'd like to do as many bolt on's as possible and save the cash for the 350, which is personally the route I would take. You can always then re-use the suspension/intake/etc parts you upgraded.

First things first, hit the track. No point aiming for mid 14's if you don't know what you are dealing with, right? Mid 14's are definitely possible, high 13's, a little more money and work.

Take a look underneath your car, or your "Service Parts ID" inside your console if you still have it, to decode and figure out your rearend gears. If 3.23's, those will do fine. 89 cars with the 305 auto(I'm assuming you have auto) came rated at 205-210 hp stock. This is the best 305 that ThirdGen's came with, mine unfortunately is the 86 with 190 hp.

Check TPS and engine timing if not already. Sounds like you have ignition and exhaust worked out already. Fab up a cold air intake to replace the factory setup, they are not very good for the Firebirds.

Porting plenum is another good idea, along with adding an adjustible fuel pressure regulator. Your 89 came with factory roller-cam provisions, so adding a set of 1.6 roller rockers will also help out. I'd also spring for a set of ET Streets out back, traction plays a HUGE role if you are only after quick times at the strip.

My guess as to your ET now would be in the 15.0-15.3 neighbourhood, all depending on track conditions, car tuning, weather, etc. Add some slicks, the rr's, a better converter, and spend 200-300 bucks getting yourself into PROM burning, along with some reading and research on the boards, and you should be well on your way to mid 14's, possibly low 14's.

This is just one route to go about what you are after, you can do heads/cam/intake/rebuild, but it is definitely not a "have-to" to hit the times you are after. Also, the mods are basically all based on track use, there are a lot more you can do just to make your car better in street use as well (SFC's, etc.) Let us know,

-Dustin

 

get a TPIS big mouth manifold, slp siamese runners, and then some weight reduction, maybe rear seats, jack, spare tire, w/e u can afford to take out. Then vigilante converter, transgo shift kit, port your stock heads, and then a cam. and UD pulleys. w/good driving you should see 13's w/that

 

how about this converter on ebay?
http://cgi.ebay.com/ebaymotors/ws/eB...sPageName=WDVW

by the way Im also having to fix a fan motor and blade seems that went out my car has been overheating and we have a new thermostat in it and new sensors so the new motor and blade should also fix it. Im wondering if at a red light Im stalling yet at wot it runs like a top is that my IAC or maybe a stuck EGR? thanks

Jason

 

hey that converter looks pretty good to me...dont think you would want too much stall for the 305...if you really wanna see a gain...get the vigilante!!! they rock. usually people see .5 second 1/4 gain

 

yah i'll testify for the Vig. i have a 2800stall Vig behind my 305. not only is it about 13lbs lighter than my stocker, but it still has lockup for good economy and it is super effecient(i'm still runnin a bigass trans cooler tho) light weight and effeciency aside these converters haul ***. all i can say is that with my vette heads and this converter, it time for some better rubber. regardless of pavement, at any rpm in 1st gear i can spin the tires hard. and a wide open throttle upshift into 2nd gear will leave about 12 feet of rubber.
i have 3.23 gears and BFG radial TAs.

 

150hp shot of nitrous! I had a 89 IROC TPI 305 and 700R4 with 2.73 gears and crap tires. K&N filters, Air foil and Compucar 150 shot and it ran 13.80's. Cant beat the price and will not hirt anything as long as your fuel and ignition systems are up to par.

 

Or a supercharger. I ran 13.85 with no traction and only headers as a mod besides the extra pressure. Kinda expensive though.

With what you have already, I'd suggest porting the intake base. Take the car out after that to the track and run it, see where you are at. Kind of hard to set a goal without knowing what you and the car are capable of, you might be a lousy driver and need a great suspension or you might be a great driver and the car is just slow. Who knows.