I want an 11sec ET from a 91 formula 305 TPI without touching the block. Is it possible?

 

with a blower or turbo it is.

well, i am not sure with a 305, but you could get close. thats a lot to ask out of a 305. they have a guy with a turbo L98 that runs low 12s, but if he fixed his traction problem hed be in the 11s for sure. and thats with a bone stock L98.

 

200 shot of NOS?

 

either go 305 tpi with turbo or 305 carb with nitrous other then that i doubt you can go all motor with a stock 305 block

 

Suspension, Slicks, nitrous. It's going to take a 200+ shot or a twin stage but it can be done. I'de do a twin stage it'll make traction a little easier. I'de also siamese the plenum, match it to the runners then match the runners to the base and port the CRAP out of the base. This will give the nitrous an easier transition throughout the intake. You could also do a direct port that would get you there and be a little more reliable.

 

but two things he forgot to add. 1. practice the hole shot launch. cuz to run an 11 on a stock 305 you're going to need to spray the entire way down the track. 2. Prayer beads, rosary or equivalent.

it will be a minor miracle if a stock bottom end 305 held together after a 200 shot.

 

The best I ever did in the 1/8th was a 8.21(roughly a 12.8-12.9) with a 1.88-60ft with a 125hp shot
That was the 2nd last run I did before blowing the motor.
I had atleast 2 tenths more in it b/c I had the window switch to turn the n2o on at 1200rpm. Before I was engaging out of the hole and the best 60ft was 1.82 with a 75hp shot.

With a great hole shot, with the 125hp shot I probably couldv'e got a 1.79 or less 60ft. I had jets to go as high as 165hp.
With more convertor(I had a 2500rpm stall), like a 3000, would help.
Also, with L98 aluminum heads(losing 50lbs and gaining about 20-30hp).

With all of those I wouldv'e been really close to a low 12sec pass or better.

Oh well, I'll get there for sure with the 383

 

you would need abit more stall, like a 2400 for nitrous applications, and 3.42-3.70 gears. full aftermarket TPI and 1.6 rockers...then good tune for all of it. then spray teh crap out of it!! if it holds, it may go 11's

cuz at most with 305 TPI that has L98 cam with stall and tune/1.6 rockers with TPI mods should go high 13s. 200 shot may go an 11.


easiest way tho would be a blower. motor wont like it tho. your askin alot out of it

 

If you have to ask, you probably shouldn't attempt it on your own.

 

 

How many times do you want to to be able to make that 11 second run?

 

*disclaimer* your stock bottom end 305 really won't "like" a 200 shot but it'll take it... for a few runs. This is what around here we call a glory grenade, you'll also hear it called a 10 run wonder, or a rolling land mine. Your stock bottom end 305 can make an 11 second run without extensive work, just spray but it will be hard on it that's for sure.

 

11's are doable.I ran 7.50 1/8 mi withe a 160 shot and the following mods ported sr torquers, 1.6 rockers, lpe 211 cam, TPIS big mouth base, edelbrock runners, ported plenum, stock 19lb injectors, stock tb with airfoil, edelbrock headers, built 700 with 2800 vigilante converter, 3.73 gear, 275/60/15 mt drag radials. The car weighed 3600lbs with me in it. Iys all about the 60ft with the 305 I was pulling low 1.5's I did run a 200 shot but it wouldn't hook it did pick up about 3mph over the 160. I think it would have went 11.6s if it would of hooked.

 

To whom ever said that he had a low end 305, was wrong.

Infact, the 91 LB9 is the top of the 305 spectrum. They are a hydraulic roller engine, which is far better then the low end flat tappet dished piston versions (LB9 has flattop pistons).

There was an article in engine masters where a cheap LG4 made 372hp with heads, headers, intake and valvetrain.

If oyu have the lb9(tpi), id reccoment the following:

Enginequest Lighting vortec Heads
Edelbrock highflow vortec tpi base
SLP high flow runners
Crane EFI Cam (you decide on spec's)
Leave the stock lifters if you like
1.5 roller rockers (crane are nicest)
Hooker long tube heads, with a good 0 loss of possible exhaust system
Electric water pump
Port the tpi
52mm throttle body
Better oil pan

The for the tranny:
Stage 2 Shift kit
Vigilante 2600 stall
B&M Dual gate shifter

Driveline:
Aluminum driveshaft
3.42 for drivability
4:11 if its mainly strip/show.

With all that you arnt really touching the block, only whats ontop of it.

That should equal around 400hp, with a small n2o shot, and some good driving skills, you should be into your speed bracket in no time

 

but i think its going to be closer to 360Hp. even still with a small shot of N0s you could get there.

 

what about ecm/prom programing

 

because your car has Speed density, any mods you make youll need to burn a new prom.

 

do not use 4.11's in a auto trans..that will make that 305 shift into OD on the 1/4 run. use no higher than 3.73s. i think that would make a good match for modded 305 TPI. although 3.42's might be better with the nitrous.

 

with N0s the 342 will be your best chooce. i have 373s and iam at 5000 rpms at the end of the 1/4. i would even say that some 323s would be nice with a big shot of Nos.

 

With a high 11 second pass, what would the mph be?

Reason why I ask is that my combo with a 26" tire and 3.73 and a 700r4 is capable of 114mph at 5500rpm.

With a 26" tire, 3.42 gear and 700r4 at 5500rpm is 124mph (assuming no convertor slip)

 

I have the 5-speed, whats the best ratio for that?

 

OR just leave it ALL ALONE (except for the rear it may need to be welded if it's open) and spray the nards off of it. Then when the 305 takes its inevitable puke you can put a 350 in it.

 

sorry this is kinda off topic but what 1/4 ET could you see my 305 TPI setup that I have in the sig below?




Mods: 305 TPI - Edelbrock Hi-Flo Intake / Edlebrock Hi-Flo Runners, Magnum Comp Cams 270H, --224/224 Dur --- 470/470 lift -110 LSA, Magnum 1.5 rockers,
Hedman Hedders, 3in Custom Catback exhaust, T/B bypass, airfoil, 180* Stat, K&N, TransGo shift-kit, Trans. Cooler, 3:23 gears.

 

Midnight, if your car is well tuned for that cam, it should be in the 13's for sure but really needs drag radials or slicks with a converter.

but it should definately be hotter than a bolt on L98, and my car is in the mid 13's

i've seen cars hit the 11.9x's with 106-108 mph traps. most tho are near 110-112mph for high 11's with a great launch. these are usualy race cars with great suspension , big converters and hell of a top end motor with great gearing to get the most out of the motor. street cars to hit 11's are near 114-117

anywhere from 110-120 is 11's but i've heard of some guys doing high 10's with 118-120 mph trap speeds.