I just started tearing into my car tonight, and am curious what you guys think I'll get at the track.

By the time my car is back together, here's what'll be done:

***Port/polish factory 081 heads, 3 angle valve job, and back-cut valves 30 deg. I don't plan on any major reconstruction of the chambers because this is my first time porting, I'll probably just try and smooth out the transitions and remove all the casting flash.

***Lunati cam p/n 54743. Specs are: (all at .050)--
Int. lift .471, exh lift .480;
duration int. 219, exh. 227;
advertised duration--- int. 284, exh. 282;
Nominal timing: EVO 49.5, EVC (2.5), IVO 1.5, IVC 37.5
4 deg. advanced
LSA-112

***Edelbrock victor jr single plain manifold that'll be converted to MPFI. Plenum volume will be approx. 175 cubic inches. I'll be using the stock 165 ECM, TPI harness, and I'm gonna try and see if I can tune it to use the 19lb. injectors.

***Flo-tech shorties
***True duals following stock routing. 2.5" pipes and bullet stype glasspacks.
***Gutted airbox
***Port/polish TB
***CAI
***March underdrive pulleys
***P/S delete, A/C delete, SMOG delete, all smog equipment removed.
***Holley Annihilator digital ign box and coil, Jacobs 8mm wires. Standard Delco plugs.

***Factory 3.23 gears, limited slip diff.
***700R4. Only mod to that is a B&M ripper shifter.
***New falken ZIEX Z rated tires. It's a relatively hard tread compound, so I'm gonna see if I can get ahold of some DR's before track time.

I'm doing my own custom PROM burning, so I should be able to get the tune pretty close assuming I can get the small injectors to work with this setup.

This is all on a 305 shortblock. It only has 70,000 miles on it, so I might as well see what I can get out of it. It won't be revved past 5500 RPM, so a huge failure isn't likely. When this one goes out on me, I'll get a 350 shortblock and swap all my toys onto it.

Here's the DD2000 screenshot. While I realize that it won't be completely accurate, check out the TQ and HP curve. TQ is pretty much flat, and HP climbs progressively until just shy of my redline. I did get some exact UNPORTED flow numbers for my heads, and took an underestimated guess at my intake manifold flow. I wasn't sure whether to choose single plain intake or tuned port injection, so I took the conservative route on that as well. With the Single plain option selected, I gain another 40HP and TQ accross the board.

I plan on installing some 3.73's and a 2500 stall before the end of the season, but that's not a definate thing yet so I'm leaving that out of the equation.

I'll be pretty happy if I can pull 405 ft. pounds and 352 hp out of a little 305

Assuming I can get traction, what do you think this setup is capable of?

 

"H.P. Manifolds and Mufflers" might be a closer approximation of Flow-tech headers.

 

That bad? The design seems similar to pretty much all the other shorties for the thirdgens.

Any approximations on the 1/4 mile?

 

Assuming the accuracy of DD2000 is correct for your setup AND a guess at 3400 pounds race weight AND you can get traction, you should run in the mid 12 second range.

Don't believe a guess until you take it to the track. You may be disappointed. I've seen many "12 second" cars only run 14's.

 

All I needed to know, thanks Stephen

Hopefully I'll be out to the track by may or so, then I'll know for sure.

 

With the fact that DD2k puts out GROSS flywheel #'s I believe that you will actually run more in the mid 13's than 12's. If you want a basic estimate you can use this dragstrip simulator.

You will have to register at the site (its free) to use the tools there. But there are a great deal of toys to play with.
http://www.smokemup.com/auto_math/edrags_test.php

Don't forget to account for driveline loss, as the simulator uses HP numbers from a chassis dyno. You plug those #'s in directly from DD2k and I'm sure it'll report a 12 second slip. I will not gaurentee the accuracy of this method. However, I did use a stock L98 dyno sheet and eDragstrip estimated a 14.002 @ 98mph. The car really ran a 14.4 @ 96mph So, its a bit on the generous side.

Here is what it estimated from my DD2k results. I multiplied all the HP numbers by a .82 to account for an 18% driveline loss. I also set the barometric pressure to 28" because thats what DD2k estimates with.
http://mywebpages.comcast.net/wjrneo...gstrip_sim.gif

If I ran a mid 13' i'd be extatic. Realistically, if I ran a high 13' without tuning then I'd be extremily happy with the setup. I know there is plenty of potential for mid or low 13's with the camshaft I have. But I don't think i have the intake or head flow to accomplish this.

 

I'll go check out those calculators as soon as I'm done typing this

The only accessories I am running is the alternator (with underdrive pulley), and the water pump (also with UD pulley). Any idea how much parasitic drain this would cause?

For now I'll follow the 18% drivetrain loss, and would 5% for my alt and water pump be a good guess?

 

An 18% loss is only good for a stock drivetrain estimate.

If a 250hp engine has an 18% drivetrain loss then only 205hp get to the wheels losing 45hp. Now you build up the engine to 400hp but don't change anything in the drivetrain. Since nothing in the drivetrain was changed, there should still be a 45hp loss however an 18% loss of 400hp is 72hp. How could you lose 27 more hp in the drivetrain when only the engine was changed?

That's why a drivetrain percentage loss is only a rough estimate. Different trannies, diffs, gear ratio and tire sizes all affect how much is lost through the drivetrain. It's not really a percentage of the engine's power but hard numbers. The trick is to know just how much power is lost through each component.

Automatic transmission examples. HP lost through each and these are only estimates because internally the transmissions can be modified to change how much drag they put on the driveline.

Powerglide - 18hp
TH350 - 36hp
TH400 - 44hp

 

After getting all my numbers dialed in, using the 18% driveline loss first, It's qouting me a 13.06 with decent stock tires.

I then tried Stephen's method of using the static loss instead of percentage based, and it dropped me to a 12.86. Then I entered in 4.11 gears and a 2600 stall, and it put me deep into the 12's. I'm not even gonna mention the number so I don't embarrass myself

I do realize that these are just toys though, and do not hold much ground. Merely something to occupy my mind during down time. But can you imagine? A 305 on ported stock heads running deep into the 12's??? I'm in complete disbelief. ( and for good reason probably)

Anyways, after I get it together, get the new cam broken, and get the tune somewhat close I'll get it out to the track and post up the results.