whats the typical 1/4 mile time for a stock 87 Iroc-z 305 TPI?

 

auto or manual? the differance is about 4 10ths!

 

its an auto, man

 

another thing, how much hp do you think you will get from electric cooling fans, and 2 K&N air filters?

 

another thing, how much hp do you think you will get from electric cooling fans and 2 K&N air filters?

 

ok bear with me but a manual will do it in 14.9 seconds at 95 mph. thats good for stock!! im trying to look through a book to look for an auto.

 

im guessing 15 or 15.1?

 

maybe. a 350 auto will do a 14.6 at 95 and thats with an extra 20 bhp, so low low low 15s would be a good guesstimate!! oh and k&ns will be good for roughly 15-20 bhp on a well tuned motor. well worth the money, makes a better sound too!

 

i know i just put them in my car lol, im also gonna get a shift kit and a 180 degree thermostat. that should help.

 

Im guessin You have an auto trans and 2.73 gears. I've seen that combo run as quick as a very low 15 and as slow as a very low 16. It all depends on the drivelines age and condition, the cars weight, driver, and track condition. And I dont think You will gain much power with kn filters and an electric fan. Maybe 5 hp at the most if Your lucky.

 

theres no way that the K&N airfilters PLUS the electric cooling fans will only give me 5 HP. plus, the engine was rebuilt, so it only has about 70 miles on the engine.

also headers are about to go on. so much for "5 hp".

 

K&N's are usually good for about 2-3% hp more if you add an air box

 

Two pieces of air filter are barely gonna give You anything noticeable whether the engine was recently rebuilt or not. If anything, install them because they are of higher quality and more economical than the stock filters. Not because U think they add 20 horsepower. Because they wont! The electric fans might give You 2 or 3 horsepower by freeing up inertia load if Ur car has a belt driven fan. Headers on the other hand will give Ur 305 10-15 horses, Theres no fiction in that! But have fun putting them on!

 

haahaa, yeah headers are not fun with a TPI motor. Electric fans though.....didnt that come stock? My 87 Trans Am came with 2 electric fans.

 

i recently bought a pair of headers for my 81 el camino 305, which was carbed, but i sold it, so would it fit on my 87 Iroc TPI 305? it looks like it would fit, they are long tube headers. or would they not work because of the heads?

 

I stuck with the shorties on mine. Thay way I could use the Y pipe. True Duels are hard to do on 3rd gen.

 

K&Ns will not give 20hp on a TPI car.

Your car is TPI so it already has electric fans so you gained no power there.

I can promise you that G-body (elcamino monte carlo etc) long tubes will not fit because the chassis is different, not because the heads are different.

Which cam does your car have? Most peanut cammed TPI 305 cars with an automatic trans only run mid to high 15s at best. with 3.23 gears, headers and cat back exhaust, and a cam my car went 14.8. see the sig for the rest.

 

i highly doubt a stock 87 305 TPI with a 700R4 tranny will do the 1/4 in high 14's. they are a slug!

my guess would be 15.30's for a well running one with stock everything.

 

I'm very doubtfull a STOCK '87 auto can go sub 15's.

Add 1/3 sec or more for an auto car......

 

I remember seeing a bone stock 1989 Iroc with L-98 350 running 14.65@96MPH at Cayuga. I was told back then that this car was a real strong runner for what its worth.

 

seems kinda funny, actually my car aint a slug, it actually beat an 85 Iroc with a 350 that was put in it.

 

sorry dude, if its a stock 305 TPI A4, its a slug. i mean no harm!

 

i did have a 305 in my 87 t.a. ,700r4 tranny, and 2.73 gears. best i could get was a 16.2, now i have a 350, same tranny, same gears and it ran a best of 15.4,still with old 305 intake. I still have the 350 engine, added a shift kit and have 3.73 gears now, havent ran it yet to see. car weight over 4224 lbs.

 

I am hoping after i FINISH MY 305 IN MY 86 IROC TO BE IN THE MIDDLE 14S to say the least.I had an 86 olds cutlass with a 350,a comp cams camshaft and headers and ran a 15.6 in the quarter{which sucks}.I hope to do better with may iroc.

 

air filters don't increase horsepower.... they increase air flow.... and i would say around a mid to high 15..... you can race me...... it's just a 305 with bolt ons... and a bigger bump stick.....

 

4,224 LBS.??!!! No wonder You ran a 15.4... You should remove the 8 100 lb weights from the hatch before You go race!

 

The 85 Iroc never originally came with a 350. Therefore, the 350 was probably carelessly tossed in, needed tuning, or maybe it needed a rebuild. Your car is a decent launcher with its peanut cam, but thats about it! I've been in many Auto 305 TPI cars and they are not fast! They are slugzzz!!!

 

Not even close. Maybe a 15.8

You got it right. I raced a 1987 350 TPI and it couldn;t get under a 15.4 actually He was pissed at my 1989 305 5 speed all stock with 227'000 km's beating him with a slow 15.1@93

 

My lb9 ran a 15.4 with a spark plug wire hanging off of the plug(could see the tip of the plug). Even with the few mods my 305 has it isn't a very good contender. It has ALOT more bark than bite.
http://www.zerotactic.net/uploads/ka...eofthelb9s.WMV

 

Trust me,,, the door doesn't tell You Your exact vehicle weight. 4,224 is the Gross Vehicle Weight Capacity,,, meaning the maximum estimated weight You should permit in Your car. Your car probably weighs somewhere between 3,400 and 3,600 lbs. depending on Your options.

 

i just thought that was the weight, well i have a few weighing stations close to me, actually one is so close i can see it from my house. will have to go over and weigh it some time

 

wow I was actually going to write something logical on this post but forget it. Hopefully the mods get to this entire post and delete it maybe next time you guys can drop the tough guy act and just talk. BTW the GVW is NOT the weight of the actual vehicle it's the MAXIMUM weight your car is supposed to have in it plus its weight. Your car probably weighs 3400 pounds as stated. And the typical times for stock 305's is low 16's high 15's that was the question posed, not how fast your car was with mods.

 

Bone stock 1985 305 TPI IROC here. Went to LVD in NY twice this year. With an open 3.42 rear and bad traction I ran 15.20's. I have a 9 bolt with 3.27's ready to go in and with traction I expect to crack in the 14's if just barely. No arguing or BSing, I drove it 80 miles there and 80 miles home.

 

manifoldsrme, yes but your 85 has the good cam. 86 and later got the dreaded peanut cam. Your car ran about what it should for an 85. peanut cammed cars usually go about 15.6-15.7

 

The 85 cars are good runners for the auto 305's.

 

To set the record straight. If it said 4224 lbs then the car weighs 3474lbs.

5 seats x 150lbs a person is 750lbs.

4224-750=3474lbs.

not2 bad actually.

 

85 cars run pretty good..... mine does.....

 

I got a 15.4 with my stock 305. And you two kids should grow up a bit....what exactly are you gaining by arguing with a stranger on the internet???

 

id say low 15's. my 91 z went 14.6@94, and my old rs with boltons went 15.5 @90

 

All non-releveant posts have been deleted. The original question was a valid one, and reasonable replies are still present. The thread is still open, and will remain that way as long as we follow the posting rules.

Let's all just point it straight down the track and keep it between the stripes for the rest of this run, please.

 

3rdgen, what boltons did u have?