just thinking quarter mile times here

[johnd]

alright I will have a 385hp engine a th350 with a stage to transmission shift kit in it and 3.57 rear gears...would anyone like to guess my quarter mile times?? oh ya its an 81, with 17x8 tqII's and firestone firehawks...if that even matters...

Thanks,
John Dysktra

 

[drags1998]

Hey John, With as little info. as you supplyed,I will give it a GUESS!!!!, depending on how much torque it makes &if it will HOOK-UP you should be able to run low to mid 12's. I hope this is close but remember,( Ive been drag racing for almost 30 years) Rarely do peoples cars run as fast as you are led to believe!!!!!! Good Luck & HAVE FUN!!!!!

 

[johnd]

oh ya torque da ummm the engine is rated at 385hp and 400 torque at the fly not the wheels.

 

[Glensgages]

'79 Z28;
355" 415 HP @ 6000 RPM- 10.3:1 cr - 292H cam - 750 dbl pump - Victor Jr. intake - DART II 2.020"/1.600" - open headers...
THM400 2.75:1/1.57:1/1:1 gearing - shift kit - 8"/4000 converter...
4.56:1 gear - 28" x 10" slicks on 8"-wide wheels - traction bars & frame connectors...
12.77 @ 109 best run; typically in the mid-12.80s

IF you hook (doubtful on those 17" pimp-wheels & Firehawks {just kidding}), mid-13s @ 103?

 

[Jacko]

Update

alright I will have a 385hp engine a th350 with a stage to transmission shift kit in it and 3.57 rear gears...would anyone like to guess my quarter mile times?? oh ya its an 81, with 17x8 tqII's and firestone firehawks...if that even matters...

Thanks,
John Dysktra

John,
You need to supply the total weight of your ride, including fuel and driver weight.
The most important factor is the weight. Weight affects et more than HP numbers.
Where are you getting your HP readings, final drive or crankshaft?
If you supply me the weight, I can give to a "fairly close estimate"
Or you can plug these numbers into a spreadsheet and calculate it yourself, if you are familiar with that kind of thing?
ex:
Weight:4000
Horsepower:275
Theoretical ET (1/4 mile):=POWER(A5/C5,1/3)*5.825 (14.21908 ET)
I would be glad to calc it for you if you don't know how to setup a spreadsheet in Excel or Lotus.
But bear in mind, this is ONLY a rough estimate. There are way too many variables to factor in to get closeer.


OK, let's discuss this issue a bit, regarding your Vette.
The first place to begin guessing your et factor is at the starting line. More races are won and lost at the starting line than any other point on the track. If you are not familiar with launching your car you will not acheive a good et. It's as simple as that.
You won't know what your car is truly capable of.

Practice is the key to launching with a good reaction time. Reaction time is crucial.
Practice, practice, practice. As your reaction times start to average in the .530 to .550 range (or better), round wins will start to come. Reason being, others will not be practicing as often. Their average lights will be in the .550 and over zone, leaving you with a starting line advantage and a 'window' for a true win.

For example, car A leaves the starting line with a .585 light. Car B leaves the line with a .530 light. Chances are greater that car B will win the race because she has a window of .055 to take the finish line. This margin at the finish line is quite large, fifty-five thousands equates to over 17 feet.
Get the picture?

Weather conditions such as sun, wind, and barometric pressure affect a racecar's consistency.
Now you have to bear in mind, drag racing is very complex. There are so many variables/factors to try to understand. And I do NOT understand all of them, all of the time.
But I do understand 3 important variables, Barometric pressure, humidity and temperature.
Barometric pressure is an easy way to watch or calculate changes in the amount of oxygen in the air. More oxygen means more power in the motor. And more power means that you will go faster. A higher barometric pressure means that the air is gaining density. Traditionally, when the air increases density, the car will go faster.
Humidity: Higher humidity means that more water is in the air. Water in the air will most likely slow the car down.
Temperature: will often allow the motor to make more power and thus speed the car up.

Well, I am not working today and I am bored. So I am sorry this is so long winded.
Usually I am not this talkative.
And this is only the tip of the iceberg. There is so much more involved. But it would take a book to get most of it down. And people have already done just that. I read many books and articles online to try and stay in-tune.

NOTE: Please understand, I do NOT think I am a smart guy, I don't want anyone to think I am a "know-it-all" type guy, I think I am just a competitive spritted guy. I know I make MY Vette work, not to the degree a pro does. Just good enough that I am comfortable with my results.
Those results have shown me that there are truly not a lot of street cars that
have beaten my Vette.
But I have been beaten bad, a few times.

The link below will show you my ET slip.

http://www.corvetteactioncenter.com/forums/attachment.php?attachmentid=1555

 

[BeaterShark]

I'll put my guess at mid 13's with street tires. With sticky tires, you should be able to get low 13's/high 12's.

 

[jim coulter]

I will guess 13.12

 

[Jacko]

alright I will have a 385hp engine a th350 with a stage to transmission shift kit in it and 3.57 rear gears...would anyone like to guess my quarter mile times?? oh ya its an 81, with 17x8 tqII's and firestone firehawks...if that even matters...

Thanks,
John Dysktra

My guess is 13.8 `14.00 - let us know, huh ?

 

[johnd]

Oh I will let all of you guys know for sure...My completion date is by may 2nd that is the first major show around here...here is what is happening to my car right now.

1. 350/385 engine
2. 3:57 rear gears
3. stage two transmission kit
4. wheel bearings
5. all new brakes
6. Full color change-dark blue metallic/l88 hood

basically it will be a whole new car a huge amount of money but I get the satisfaction of doing most of the work myself not bad for being 20 eh? I can thank the army I guess

 

[Evolution1980]

You should be in the mid to high 12's. I will assume that you are running without any emissions controls.

I'm running a ZZ4 (355hp/405tq) and a worn out TH350 (3.08 gearing). Street tires on it (BFG T/A Radials).

My best thus far is a 13.44 @ 106

 

[johnd]

You should be in the mid to high 12's. I will assume that you are running without any emissions controls.

I'm running a ZZ4 (355hp/405tq) and a worn out TH350 (3.08 gearing). Street tires on it (BFG T/A Radials).

My best thus far is a 13.44 @ 106

that is about what I think and am hoping for I would be happy for a high twelve car I never have had one that fast and would be rather nice to have a 123 second daily driver...