Not to add fuel to the fire guys, but how is a test where a single part is tested on different people's cars remotely buletproof? I don't own the plenum, nor sell it, so I have nothing to gain one way or the other. But if we are talking about a realstic test, then the only way to do it is baseline that car on that day, on that dyno, install the plenum, clear the ecu, and redyno on that day, on that dyno. Doing it any other way leaves too many variables up to chance. This the very reason why I cannot for the life of me understand why people put so much creadance in dyno's and why they spend $100 a shot time after time to "verify" things without keeping the testing consistent. A dyno can be a great unign tool, especially for getting your torque and hp curves generally plotted the way you want, or doing initial adjustments for a new, given mod. However, as a be all and end all truth to hpw much power a certain part is worth, its not incredibly accuate at all.

Perfect example is the intake - what the gentleman posted above is 100% correct - on a dyno, the intake gains are negliable, as the car is in a static environment, without real wind hitting it (no fan that any commercially used dyno place has can replicate wind at 65mph). I suspect the same can be said for many of the inake related mods, since they are dependant on actual real world air movement, not simply a big fan sitting in front of the car.

You need to be more subjectve (or maybe cynical) when reading these results

 

Well, after double checking my dyno, I find I misread the torque number by looking at the hp scale instead of the tq scale. So, I have spent time to carefully review both dynos in 500 rpm increments.

RPM
1. JWT/LBMS
2. Crawford

3,000

1. 132 hp / 232 tq.
2. 130 hp / 230 tq.

3,500

1. 157 hp / 232 tq.
2. 156 hp / 235 tq.

4,000

1. 176 hp / 232 tq.
2. 177 hp / 240 tq.

4,500

1. 205 hp / 241 tq.
2. 205 hp / 240 tq.

5,000

1. 220 hp / 232 tq.
2. 225 hp / 232 tq.

5,500

1. 230 hp / 227 tq.
2. 230 hp / 230 tq.

6,000

1. 246 hp / 216 tq.
2. 250 hp / 220 tq

6,500

1. 245 hp / 200 tq.
2. 245 hp / 200 tq.

Peak
1. 254 hp / 243 tq on dyno run 1
2. 256 hp / 243 tq on dyno run 16

I will post my dyno whenever I have a chance to get a digital pic of it. But, for now, my review leads me to believe the dynos are very similar.

And, I agree with Z1.

 

yes it will, there is a guy in tenn. with this setup

 

Entirely unnecessary. But, yeah, see you at the next meet.

 

Well, had a chance to scan at the office. Note that there is only one good run. The 2nd run was not printed. And, the 3rd run was aborted prematurely.

So, use run.001 for comparison.

 

There are two runs on the graph, which is which? Is one a baseline before certain mods and the other after?

 

They are two separate runs with the same mods.

Each dyno run can produce a result that varies by 5hp/tq. This is why some companies will run multiple runs to get their best result. If you look at Crawford's as an example, they posted thier 16th run. I would bet that they ran as many runs as necessary to get max results.

The first run in red is the one that should be reviewed. The second run was a test because the dyno man sensed detonation. It is not posted. The third run in blue was prematurely terminated before 6.7k so is not as useful for peak evaluation.

 

Looks like your smoothing is set to 0; your graph has a lot of odd spikes all over the place. Which could also cause artificial numbers.

Can you ask the dyno place what the smoothing was set at?

 

I have no idea. I read the post about setting it to 3 but didn't bother to go into that issue with the dyno guy. It doesn't really matter in my opinion. Dynos have to be taken with a grain of salt. They wont measure as precisely as we want but will give us a basic idea of what is being produced.

If you look at the numbers, I'm confident you will find my dyno, Crawford's dyno, zxsaint's dyno, 350z4Steve's dyno all within a few horsepower ballpark. In a real world race, the difference is irrelevant and it would come down to the driver. When you start talking 20 or 30 hp, that's when I think things matter.

 

If it doesn't add at least 20hp, I'm not putting anything that ugly/ghetto under my hood.

 

Umm, how can you have the exact same torque at 5000rpm and then have different HP?? That is simply NOT POSSIBLE!

HP= (Torque x rpm)/5252

 

Easy. My review of both dyno charts were eyeballed with a ruler on my dyno sheet and on my 20" monitor. If I'm off by a couple of points, I'm not surprised. And, you're obviously right. The numbers should be the same based upon that well known formula. That means, my eyeball was off on that rpm.

 

OK, that makes sense!! I thought you actually had the rpm band printouts!

 

Have you seen one in person? I think it looks much better than the stock Plenum and I don't have the polished version. The Bling version is really sharp! The replacement strut also looks better than stock.

 

Its like a soap opera...

Cally Guys... You rock... thanks for the set up info