Ok yeah I guess I got off to a rough start. On every other forum I have been a part of though, we tend to give bench racers a hard time. You know the type, they sit on their butt, typing away what numbers they think they will run in the 1/4, yet never go to the track. But in this case 85 305 isn't even a bench racer, he's a bench dyno'er. I think many people will agree with me that "estimating" your horsepower is really lame since it can't be based on facts like dyno sheets. I respect your car 85 305 and I respect how you don't have time to get your car dyno'd, it is quite a long and arduous process. But until you actually DO get your car dyno'd, I feel it would be best if you did not post number you think your car puts down. The same goes for the 6spd tranny. I've seen cars with it and they are amazing and I think it is a really fun road to take, your car will be amazing with one in it. But until you actually install it, please don't list it as "soon to come". Thanks guys,

-WGP

 

Guys...play nice.

 

I own a 91 trans am w/a 350 tpi, i have full exhaust, 3:73:1 gear ratio, my best et i ran w/ some practice was 13.8 @ 100 mph. The do have potential. With those mods, mild cam, ported heads, you will be there. 85_305 i dont know how much more your t-5 will hold up if you really do have 300 hp.
I would get that six speed pretty quick.

Zach Horn

 

To clear up a few things.
1985-85: All TPI F-bodies were 305/auto's with the L69 camshaft
1986-86: All TPI F-bodies were 305's, and all recieved the peanut cam.
1987-92: All 305TPI/auto cars got the peanut cam resulting in only 190hp. 305TPI/M5 cars got the L98 camshshaft putting them about 20hp down from the 350's at 215hp. 350TPI/A4 all got the L98 cam, which varied from year to year. 89 TPI 350 cars had the most agressive camshaft at 207/211 dur. @.050" and .415"/.431" lift on a 117* LSA.

TPI cars receive the most gain from intake mods as the stock intake flows like crap above 4,500rpm. Just porting the stock stuff can be worth a good 20hp overall, with a smaller peak gain. The main advantage in porting the stock stuff is the power gains above 4,500rpm which enables you to pull harder at the top of a gear. Aftermarket base, runners and port matched plenum will enable you to pull much harder above 4,500rpm without losing torque. My car pulls strongly to 5,000rpm. Enough to keep with an LT1 car from a 100mph all the way to 140mph. I have a stock base, stock tune, cam, intake, and headers/exhaust. Currently the car is too rich down low to pull hard, it pulls harder above 4,000rpm than it does from 3,000rpm. With a tune, and aftermarket base I think I could do much better.

Full headers/exhaust, and intake upgrades will get a TPI car into the mid to high 13's no problem on street tires. Add drag radials, stall, and gears and it could be very possible to hit a low 13 with a very good driver.

A Vigilante 9.5" converter is good for 3/10ths on most TPI cars.

 

Not true. The L69 cam (.410/.423)was ONLY used in the L69. Like 85_305 and I stated earlier, the 85 TPI got the same flat tappet cam as the 350 Corvette cam (.404/.415). The 87 Fbody and Ybody 350 and Fbody G92 305 received a roller version of the 85 305 cam.

 

Well, *i* feel it is best for me to post what I believe my car to have (by doing tons upon tons of homework), and that I am gonna put a 6spd in it. There is absolutely NOTHING wrong w/ me saying I am getting a 6spd. Many people on this board state their upcoming mods; I have many, but the only one I am putting up in my sig is the tranny

But there is deffinently 305 TPI's w/ manual transmissions; why are you saying there isn't?

 

my friend has a late 80's trans am with a 305 TPI and a 5 speed....soooooo...yea they got em

 

Well tell that to everybody else that has something planned, and is on their sig

But doubt all you want; we shall see *hopefully* sometime this summer if I get the cash and time

 

thats why people give you a hard time 305

"if i have the money and the time"

If i have the money this summer my car will get a cam, intake runners, and a better port job on the heads. But unless i knew for sure i am going to have the money soon i dont go telling people all about the motor i will one day have.

on the other hand i might mention something about a tko-600 seeing as how im probably going to be ordering one on the first of june

 

Doug, you know it's prolly easier to just call me matt
But I know for a FACT that I will be getting the 6spd next winter, and I know for a FACT that if not this summer, next summer I will be dyno'ing the 305.

 

ya but thats a long time away man, next summer ill probably have some money to do upgrades on my engine, ill for sure have some cash, but i wouldnt tell people i have a 375 hp 425 lb ft engine because thats next summer. Again i dont care really care, thats just why people give you a hard time.

 

I dunno about you guys but I am having a HELL of a time getting my car to low 13's. I have AFR 195's, Holley Stealth Ram, Vigilante 2800, SLP 1 3/4" headers, 24# injectors, custom grind cam, etc etc etc and I am still high 13's. Somthing must be wrong somewhere... But low 13's is not some EASY task. Its gonna take a lot of money and time to make a car that ran 14's in its hayday, and probably runs low 15's right now, to shave 2 full seconds off. You'll need 55RWHP gain to run mid-high 13's and about 80rwhp gains to go low 13's.

 

Umm with that combo you should be making around 500 hp and be nicely into the 12's. Thats a pretty ballsey combo, do you have a custom burned e-prom? if you dont thats why your car is running like ***. Not only would that add about 150 horsepower to the combo you mentioned, you just cant do all of those mods without a completly custom chip.

Low 13's arent that hard on a 350. Full exhaust, either aftermarket intake or heavily ported tpi, and rear end gears should net you a 13.99 with a good 60 ft.

 

Like Doug said, w/ the combo you got going you should be kicking the SH*T out of the 13's, and possibly be in the high 12's.

 

I was running a custom chip last year, yes. I went to the dyno and tuned it myself under the guidance of one of the dyno operators/tuners at APE in Detroit. I got the air fuel ratio nailed down to 12.5:1 and the spark was at 37* advance. It was quite anti climactic to say the least. I did a few things this year and hopefully corrected a LOT of stuff, we'll see what time will tell.

You guys ready for these numbers? 240RWHP and 257 RWTQ.

That translates to 288hp and 312tq at the motor considering a 20% drivetrain loss trough the automatic tranny.