I just dynoed my setup and am wondering what 1/4 mile ET and MPH I could run. I still have some more tuning to do with the carb, but it's running pretty good.

If I have 298hp at the rear wheels, what would it be at the crank? I've read 22% loss due to the 700R4 .. so would that put me around 380 at the crank?

Also, anyone know when the tracks start opening up in my area?

Thanks!

 

I've read 22% loss due to the 700R4

Where did you read that? Just courious


If you can get good traction and depending on the tune.

EDIT- Forgot its a 305. Mid 12's

 

12.8 to 13.0

 

I found the value for the loss in various posts (mostly around 20%). I also meant driveline loss with the 700R4, not just for the transmission. Is that value close?

 

298 + 20% is 357. Every dyno varys by around 8 percent. So an exact number is hard to obtain. 380 seems high. Id say 360-365 with that setup.

 

you're right .. i was calculating it wrong

 

Props to you on your build up! Do you have plans on a more race geared motor in the future?

 

Thanks, it's always nice to see the final results after you do something. Yes, I do plan on installing another engine in the future. That's the reason why I haven't done any rebuilding on the 305. I'm not really too sure what I'd want to replace it with. Probably a 350 of some sort, but I just haven't really researched it at all. It will be something that has more cubes, can turn more rpms, and strong enough to handle a lot more boost.

It will probably have to wait until I start making money or the 305 blows, whichever comes first. It would be nice to be able to build the engine out of the car though and just stick it in there when it's done, since the car is my daily driver. I think I have the power addiction now. =)

 

Actually calebzman you are correct in your calculations and 89irocz350tpi you were incorrect. You cant add 20% to an number to find 80% of that other number. Say there is 20% drivetran loss you need to calculate .8x = 298 so you divide 298 by .8 and you get 372.5hp at the crank. Sorry just wanted to know what your making at the crank. I would have to say that with decent traction you should be able to get in the mid to high 12's.

 

That's how I was doing it at first too. But, the formula seemed flawed. Because if there was 30% loss the formula would be .7x=298 and there would be more crank hp. Crap, I was right. Thanks for re-clarifying what I originally thought it was.

 

300whp should get you into the mid higher 12's somewhere with a good drag radial or slick. street tires, depending on size/rubber compound etc, should do lower bottom 13's with a good trap speed. possibly a cracked 12 with great driving (mainly the launch on the street tires)

or about as fast as lid only to a catback/ lid ls1 i'd say

 

My bad...I hate math lol

 

and that is if the 20% actually true. transmissions don't take a specific percentageo f power.

also how does 298hp which is around the level of a LS1 equal mid to high 12's?

unless he has decent suspension mods nad good tires

which he should have anyway right?

 

Ive seen a bone stock WS6 car run 12.7.

 

i agree with 89IrocZ350TPI, i have seen a few bone stock ls1's with just tires run 12.5's or even a little lower and in his other post he says that he just made 3 pulls and it was running really lean so im sure he will get more out of it.

 

well for the most part, i do believe thirdgens are a tad lighter than 4th gens...

but 300whp will trap anywhere in the 105-108 range depending on gears.

thats good enough for mid high 12's easy on slicks.. 1.6-1.7 60 foots.

street tires is more like 1.8-2.0's and is lower mid 13's at similar traps

edit: and if you havent already.. i would seriously look into a good torque converter. your gonna need one to run some real good times. brake stall to build boost too of the line and your gonna turn some good ET's