Have all the runs been done on the same dyno, even the before the camshaft runs?

 

Yes they have. The one RPM Motorsports did wasn't posted at all.

 

Cool, Good Luck!!!

 

Thanks!
There will be one difference other than any changes on the car though. All of the other runs were done when it was warm. Sometimes very warm and humid. It'll be below freezing in the morning. Good for Horse power but not good for Weav!

 

Not quite what I wanted but it's close. The adjusted RWHP if all conditions were perfect is 336.

 

That's great, Mike - excellent way to start off the new year!!

 

IIRC you still have stock, unported LT1 heads. If so, your numbers are exactly where I'd expect them to be.

FWIW, there's an easy 20-30rwhp available if you do some cylinder head work.

 

Thanks Jim, I was hoping for 340 but it was close. My plan for this Spring was to have LE do my heads since I have the price of the springs as a credit on them. Now, I bought this Dana 44 so that is probably out the window for now. Maybe by next Fall I can swing it.

It is isn't it!
Last year sure went out with a bang with this car so I figured I was due a luck change.

 

Jim, let me ask you something.
I have the Stainless Works 1 5/8 headers on the car at the moment. Would it be of any advantage to change over to a 1 3/4 header? I know this is a heated subject so you can PM your answer if you like. Not wanting to start a war here. LE said the 1 5/8 would hurt me. You agree? My thinking is they do. The torque fell off really fast.

 

This is really some good power, even more considering your heads are stock. When you get the heads done by LE, you will be amazed at the difference.
The headers, well, I went with 1 3/4 as they were for future mods, prior to even getting the 396.
I personally would recommend 1 3/4 when you do the heads.
It would be great if you could do a dyno with the 1 3/4 prior to the heads
PS, I think the D44 will change your dyno numbers a little bit, do to gear change.

 

That may likely happen Steve. I've tried to make a dyno of every major change I've done.

 

One thing that is really going to help, prior to you changing your program for the gear change, is once you get the gears in (D44), get real time datalogs that your tuner needs to fine tune your engine as it runs now. That way you are running real well, and the header dyno etc wont be such a miscalculation.

 

That is where prOzac is going to come in. I'm going to try and get up with him to do some data logging now that it runs fairly decent.

 

"Hurt" is a relative term. Someone that races professionally would say that a loss of any power hurts them and that would be true. For a fun street car, do you really need that last tiny bit of power? Likely not although it's always nice for bragging rights

Intuitively I would say "yes", 1 3/4 would be a benefit. I ran some scenarios using Engine Analyzer Pro to see what the sim would spit out. I used this sim to model my 383 build and the predicted results were spot on with my actual experience several months later. Others have had the same experience with this tool.

For all simulations I used a 15% driveline loss factor.

Sim 1: Currrent engine...1 5/8 headers, cam, stock LT1 heads
Peak HP: 332
Peak Tq: 349

Avg HP: 247
Avg Tq: 307

Sim 2: Switch to 1 3/4 headers
Peak HP: 331
Peak Tq: 343

Avg HP: 245
Avg Tq: 305

Sim 3: Switch to 1 5/8 headers & AFR 195 Street Heads
Peak HP: 393
Peak Tq: 373

Avg HP: 269
Avg Tq: 326

Sim 4: Switch to 1 3/4 headers & AFR 195 Street Heads
Peak HP: 397
Peak Tq: 377

Avg HP: 268
Avg Tq: 324

You can see the initial sim is pretty close to what your actual results were. Keep in mind that I had to guess at some of the cam specs such as opening and closing, duration @ .200, etc.

What the results show are that the stock heads are a severe restriction (no surprise there) and that a switch to 1 3/4 headers will not gain you much if anything. Obviously there are a lot of other variables to model, but EA Pro is a pretty darn good tool. IMO the results are directionally correct even though they may not match what some would consider the logical answer.

So if you believe the sim, the real question boils down to hp/$ & tq/$...Is an increase of perhaps 10rwhp / 10rwtq worth $1000 (maybe net $250-$500 if you sell your 1 5/8 headers)? Only you can answer that question. If it was my money...I'd be totally focused on the cylinder heads.

 

Wow! I wasn't expecting all of this! This is great and it answers my question very well. Thank you!

After the Dana switch I can see heads in my future!

 

Read your post on LS1 tech did you ever test the ICM and Coil>