Just got back from orlando speed world on changes were edelbrock headers and 3" cat, adj. timing to ~7*(I think) and modified/removed the heat riser in the intake. I picked up 5 mph and almost .6 sec.

60' 2.211
1/8 9.596 @ 72.39 mph
1/4 14.879 @93.02 mph

This is with the stock long block and intake. 5 speed w/3.73 gears shifting at 4500-4900 rpm.

 

Those times are impressive. Are you running a stock intake with the short height filter? The best setup I could compare your car too was blackbird305. I believe he got a 14.9 something but that was with an Auto. You're getting really good mph, spend the $15 and see if an open element helps out any. What injectors etc? Either way, it's obvious that the 5 speed and a good driver are really MUCH better for a near stock motor. Given the chance I'm going with a stick. Probably not going to happen until I'm out of school. Less drivetrain loss, it's even more apparent with slower cars with less torque.
See if you can get that 60' down to a 2.0_ . I'd work on weight reduction . Removing stuff is the free way to go faster.
Have you adjusted your fuel pressure? If you haven't, I'd try it, and mark exactly where it was before since you're obviously doing better than most.

 

Yeah, it still has the stock inj., stock TBI, stock fuel pressure, and stock intake manifold. I made sure it still goes rich at WOT, hence I haven't checked FP or changed it. The only tuning is the timing and a hypertech streetmaster chip (fan on at 220) running 93 octane. All runs were at ~160* (A/C = fan switch). The race weight is about ~3500lbs(not positive/poor memory).
I get ~23 mpg on the highway @ 80 mph (~2700rpm)if it means anything.

I have a K&N filter in the stock filter housing with heat riser valve removed and I'm using the lid and hood from a 82-84 formula(I think). It's a functional cowl induction and also works for filling the engine with rain water(twice). If I can get a hold of a open element, I'll try it, but that ruins the whole stock/sleeper look IMO.

I think a big help is the gears. Today I was going through the traps in 4th around 4700-4900rpm.

The suspension right now is stock w/GR-2 struts and no-name shocks. I'll have a poly torque arm bushing in soon since the rubber one is trashed. Tranny mount is poly though. Wheels are GTA crosslace with 245/45/16 goodyear GS-Cs at 32 psi. I also got my best 60' today although still not that good: a 2.16 and 1/4 14.97@92.40, with my 105 lb g/f riding with me.

The closest to stock time I have was 16.0 @ 85mph ~4 yrs ago in HS, but that was with the chip, gears(2nd mod must have posi), stock tires, stock exhaust(no muffler/rusted/fell off). probably about 80,000 miles. It now has ~113,000.

 

just about any heads are better than the stock heads

I paid 150 bux for freshly rebuilt 416's (the same heads on an LG4 that happen to be alot better than swirl ports)

 

13's out of a 305 TBI using the stock heads and no power adder? What are the rules exactly? If it's just that you have to use the 305 block and heads and no power adder, then it's a pretty dumb challange. Does it at least have to be in a F-body? What are the weight restrictions?
I don't get this guys!

 

duke, the idea is to run a 13second pass on swirl ports using tbi. it will be done in an f-body. other than teh heads beign swirl ports you can do cams, intakes, suspension and chassis, whatever.
it may sound silly to you, but it is one of those thigns that hasn't been done yet.
from the looks of it this challange has been taken up by enough people that there will be many 13sec stock headed cars this summer.
i guess next is to go for 12's with any heads and no power adder

later
tim

 

Right now my LO3 firebird is running almost the exact same times as my LB9 GTA with the same mods. The LO3 has a slight weight advantage of 100lbs and better gearing 3.73 vs 3.42, but the LB9 has TPI and much larger cam (stock). I do have the 081 heads sitting in the garage right now though waiting.

 

my car is heavy and barely has any mods due to the very insuffent lack of income!
<~~~~Broke
I own a 88 trans am hard top
what does everyone thing would be the least you would have to do to get our goal of 13's

Right now i have an open element and a cowl hood, but i have lots of ideas.
what times could i run with(provided these are all within the paremeters):

posi, 3.73's
headers, no cat magniflow exaust
holley street dominator intake manifold
tbi spacer

this is all i can afford as of yet.
keep in mind none of these are done yet but i'm wondering what i could get..since i've never been to the track and my friends say i could run 16's right now
also any cheap or free mods that anyone wants to input is appreciated
good luch fellow LO3 members

 

I'm not going to speculate on the least required for 13's but take the tbi spacer off the list. Reasons for the spacer; plenum volume, prevent heat soak, and helping atomize the fuel. With TBI, those last to reasons cancel themselves out. With wet flow intake you want to keep the intake hot/warm. The fuel itself will cool down the air mixture significantly. This is why it is only popular for dry flow TPI guys to be "icing" their intake. Next there is no heat soak in the same sence as a carb. Carbs don't have a return line so the fuel will just sit. If the engine is too hot there is a chance that the fuel vaporizes inside the carb and gases cause issues (mostly during a warm restart). If you don't believe me, check out your TBI when it's relatively cold and humid out. There WILL be ice on the TBI which can cause problems with idle control until the car warms up the TB enough. So now you've got the advantage of keeping the fuel in suspension but then reliaze that you don't need the extra plenum volume with the new intake. Next thing to consider is that the fuel will fall out of suspension unless it is ingested by the motor soon. This is why you don't see long tube intakes that are wet-flow. Fuel just doesn't like traveling in suspension for such a long period of time, think of it as a cloud and rain. You would rather have the cloud than rain.
So in reality the spacer is almost never useful on an aftermarket intake. On a stock intake it can produce real results, but once the intake isn't the bottle neck you don't need it and in most cases it will hurt performance.
3.73's posi is the best bang for the buck, then it's headers and exhaust. Once that's done, do the cam with the intake. Last choice is heads but in most cases the 305 would be better off getting put aside for a 350. This is why you don't see a lot of 305's with heads. It's because if you can afford the $800+ on heads you might as well get a 350, make the same power with a smaller cam, nicer road manners, AND have more potential. That gets us to the whole 13's with the stock long block. If you go with a carb intake and spacer, try tuning with the carb. You'll get a lot more help at the track and you can keep the computer in for data-aq (manifold pressure, coolant temp, intake air temp, etc.). TBI isn't for everybody. It's definatly an option for those that can manipulate the pathetically mellow computer programming, and for what it's worth, read up on how even on high performance vehicles TBI is at most 10hp short of the Stealth Ram on a car making ~400hp (TBI has a smaller TB AND it had to flow the fuel so it looked like an airflow restriction, NOT the fuel deliver).

 

thanx for the long and well appreciated post. what would us third gen's do with out you well expieranced moderators!
:hail:

 

DUM DADADA DUM, DUM DADA DUM ... Stop Knockin my Stick!

I got a few odds and ends to get done. 1.5 Roller Rockers, springs still need changed, I just hope my 3rd gear is still accessable by the time i get to race it. STUPID syncros going bad.
Speeder, Prevost and I hope my stock fuel system doesnt starve with the manifold and Throttle Body thats gonna be installed soon. I still have to order a adjustable regulator to make that easier.

it feels strong right now, cant estimate on times ... I have no G tech and cops are more abundant here than water to try the stop watch and 1/4 mile-to-offramp trial. But she pulls hard through all the gears and RPM ranges. I took on my buddys built SC last night.

Feburary 16th will be D-Day. A fun filled day of datalogging, racing and tailgating!!