I spent another day at the dyno today with much better results.

After dynoing at Slowhawks last week, we felt that the plenum with the divider was not efficient enough for the runners. This was from Don noticing that the MAP reading were about 10% lower in the rear of the manifold vs. the front. Plus the fact that the 5.25" runners performed much worse than the 4" runners. The thought was there was just not enough room around the opening of the runner to allow it to pull air freely.
Here is a pic of last weeks manifold, with the plenum divider. The runners are the 4" + the 1.25" extensions.




So we removed the divider from the plenum and tested open plenum 4" and 5.25" runners again. Unfortuetly, the car we used last week was only available last week, since Don is pulling the motor for some upgrades, but Justin offered his 6.0l Dart headed, Ed Cutris ported Fast92, 3rd gen hybrid. The baseline dyno pull was with the ported FAST, and flatttened out at 420-425rwhp from 5900-6700rpms.
We then swapped his manifold with the 4" open plenum Fibertuned manifold. (I have to say, its a 10 min job on this car vs. 40min job on a 4th gen) We did a first pull up to 6700 or so, and the power looked good, so we did a second pull up to 7200. The car was still pulling hard, and looks as if we should have revved it up much higher, but that was as high as he felt comfortable with so we stopped there. When he lifted (or hit the rev limiter) we were up 18rwhp over the ported fast92. Here is the dyno sheet Peak numbers were:425 vs 443. The midrange suffered which is to be expected, but this was a unbolt and bolt up swap, no tune mods were done. The midrange went way fat just like it did everyother time, and some power can be recovered by dialing in the tune there, but up top, the origional tune was close enough.
Some notes on the dyno. 1st the RPM on the graph was reading a few hundred rpm's lower than Justin recorded with his efilive. Also, the AFR on the graph was a full point higher than the WB in his exhaust. (ex. 13.5 vs 12.5).

In hiend-sight, I wish we had spent the time dialing in the tune to see how much of the midrange we could have recovered. Also, we should have spun the Fast92 up to the same RPM just to see what it would do.
There is always next time.



Solid line is ----FiberTuned 4" runner / open plenum
Dashed line is--FAST 92, Ported by Ed Curtis

 

This is the kind of testing it's going to take to get it done! Keep up the good work, and congrats on beating the current top dog above 6000rpm!

 

it would have been really nice vinny if we could have dialed each set up with the tune, but overall this gave a good indication of about how the two intakes compared. The fiber tuned intake definitely loved the rpms, and just kept on gaining the more we reved it. With some tweaking in the tune we could have gained some in the mid range but overall the tests came out great.

Really glad we got the results we were looking for, and i can tell everyone that vinny has been working around the clock to get the most he can out of this intake.

Justin

 

Those results are showing some promise. I am confident that with some tuning you could make up for a bit of that gap below 6K. Hurry up and get me the open plenum so that we can test it on the 427 on the engine dyno. We are hoping to have a GMPP to test as well with an accufab carb style TB on it. That motor should be coming up on the dyno in the next week or 2.

 

Looks like your making progress Vinny. You are planning on testing more with the 5 1/2" runner right and do you plan on doing any testing with a longer runner than a 5 1/2"?

 

We did test the 5.25" runner yesterday, but it didn't do well, it performed similar to last weeks test of the same runner. I believe that it still suffers from having the inlet of the runner too close to the top of the plenum, causing a restriction. The next step is to start building some curved runners to get the runner inlet in a better position.
Knowing what we know now, we are going to build some prototype long curved runners, and test them as soon as possible. I would like to go after a 7 or 8" runner next to have something more suitable for the avg. street car. I'll post updates on this front as they become available.

 

Good to hear Vinny!! My car is at Don's now if you want it haha

 

Update. We sent one of ours back yesterday for the removal of the divider plate. Hope to have it back in time to do some back to back engine dyno pulls on the LS7 427 w/ the (out of the box) AFR 225's on it.

We received the intake back with the divider removed. Unfortunately, the engine builder had to go out of town for a couple of days so things got pushed back. We have everything needed for the engine dyno comparison so it shouldn't be long now.

On a more somber note, I think I blew up my motor last night. I had a lean condition that I will be trying to figure out but it will sit on the trailer until I can get access to my buddy's lift. Probably a couple of weeks. It is now going to be imperative that this intake work under some heavy boost as that will be it's next mission on my car.

 

damn that sucks. I know how you feel, mine has been down since May.

 

February here HKE motor will be in the mail next week though

 

No way that I will be down for that long.

I just got a good deal on a PT88. Depending on what's going on in my motor, shouldn't be down for more than a few months.

 

mine was "started" in july, but everything in it was custom or backordered, so it took 7 months to finish, but it should be worth the wait

 

Friday or Monday should be the Engine Dyno comparison that everyone is waiting on.

Got pushed back a few days due to some unexpected cylinder wall damage when it was torn apart yesterday. Waiting on new rings.

We finally got the engine dyno information. FAST90 vs GMPP vs FiberTuned.

I'll post the numbers later tonight or tomorrow morning.

 

"TEASER"!!!!!!!!!!!!!!!!

Christian

 

Results are pretty good!

 

Get em up!!! haha

 

LOL...I know that spider came out on top..

 

Sorry guys. I posted the teaser from my cell phone. I just got home and will start typing up the info as the data was printed in text format and I dont have a scanner. I'm going to see if it is ledgeable in a picture. If not, I'll have to type it all out. Then someone else may be able to plot the info in a graph.



Loudmouth, thanks for the GMPP to use in the test.

 

This is the kind of work I want to get into.....

 

Muhahahahaha. For the $. Old school Baby!

How much timing did the GMPP like?