Well, I had my first dyno done yesterday on a Dyno Dynamics Dynamometer before having anything else done. Best pull was 285.2 rwhp, 301 rwt.

Pull #1
Intake Temp 25.1C - 25.7C
A/F ratio: Min 10.7, Max 11.9
HP 269.9 @ 5455
Torque: 282 @ 4364

Pull#2
Intake Temp 26.4C - 26.8C
A/F ratio: Min 11.2, Max 11.9
HP 285.2 @ 5576
Torque 301 @ 4364

Pull #3
Intake Temp 27.4C - 27.6C
A/F ratio: Min 11.0, Max 11.8
HP 274.3 @ 5818
Torque 285 @ 4545

[attachmentid=20284]

 

You jumped 15 hp from pull 1 to pull 2. Sneak in new radio ***** or sumtin?

 

I know...I don't know why the huge jump.
The a/f at max HP on run 1 was 11.0 and run #2 it was 11.5 but run # 3 was also 11.5. The intake temps were 25.7, 26.7 and 27.6.
All accessories were off and the radio ***** stayed the same!

 

Your temp & a/f don't account for the change. I am not familiar with the Dyno Dynamics dyno. If you're going to see a tuner, might be best to have them establish your baseline. It's gunna be rough working with the variance you show now.


Paul

 

That's basically what I was doing. This is the dyno (Kinetic Motorsport) I was planning to use for the tune.
The technician who did the dyno is the tuner from Brown Bros Ford (www.brownbrosford.com). They're a Diablosport CMR Dealer (www.diablosport.com/OurDealers.php).

 

Nice! 285hp on just an axleback....

 

[/quote]
That's basically what I was doing. This is the dyno (Kinetic Motorsport) I was planning to use for the tune.
The technician who did the dyno is the tuner from Brown Bros Ford (www.brownbrosford.com). They're a Diablosport CMR Dealer ([url=http://www.diablosport.com/OurDealers.php]/quote]


Ask them why your pulls were so uneven and what they suggest you use for a baseline. Maybe they have an explanation......or maybe it needs to be performed a second time.

 

Looks like the axle-back netted you 6rwhp and 6rwtq.

Magnaflow said they got about 6rwhp out of the Borla system as well (I guess when doing research??).

 

I tend to agree with Paul - that's quite a jump between pulls 1 & 2 with no changes?? I'd be tempted to have them run it again and see what you get - with your results jumping around so much it's gonna be hard to tell what a new mod really does for you.

good luck!

 

How can you tell that??

 

How can you tell that??
[/b][/quote]

Well, from what I've read on these forums, most people are dynoing about 275rwhp and 295rwtq (+/- 2)

Assuming your car is average, you gained approximately 6rwhp/6rwtq. Not bad IMO.

 

Dan, I think most of the info you're seeing is using a DynoJet dyno. Redfire05GT is using a dyno Dynamics and I don't know how close it would be to a DynoJet. He will have to establish a baseline with either though that he feels he can trust.


Paul

 

Oh, good point. Didn't realize it wasn't done on a Dynojet. I guess we'll never know because its unlikely he'll put the stock muffler back on and redyno.

 

I'm not sure what I'm going to do. I was originally going to get the dyno done at one place ($125, 2 pulls). They have a DynoJet 248X which has a 48" drum (dynojet 248x specifications). But they haven't tuned via DiabloSport, just SCT. My dealer is a DiabloSport CMR tuner and they use the DynoDynamics facility which has a Twin Retarder 450 model which has 8.5" rollers.(dynodynamics 450_TR specs). Cost there was $100 for three pulls. I decided on them because that's the facility my preferred tuner uses and it was more economical. But I'm not happy with the variance with the second pull. I've since been advised that the 48" drum is more accurate? I think I'll sleep on it for now...

 

Your main concern should be to establish a good baseline so you can judge what mods do as far as affecting your performance. If I remember right, the Dyno Dynamics is a Ausie built dyno and tends to rate hp just a little higher than the DynoJet. But, even using two different DynoJets (for instance) will give you somewhat different readings. IMO, if your tuner is most comfortable with the DynoDynamics, it's more economical AND they can give you a reliable baseline, than I would head in that direction. Pose the delima to your tuner and see what they respond with. They (dyno's) are all a tool of measurement, so you want someone who knows how to use the particular tool effectively. We're all looking for the best bang for the dinero!

 

I called the dyno place and talked to their technician (not the technician who did my dyno) and we reviewed the numbers. He'd toss run #1 as the car was likely on the cool side (intake temp a shade lower and a/f a little rich). It sat in the parking lot for about 20 minutes before being driven around back where it sat (off) for another 5 minutes. He advised to leave it running next time. (What can I say...I'm a rookie at this!) He agreed that the discrepancy between #2 and #3 was difficult to explain...thermostat might have opened?, etc. So they agreed to redo the dyno, n/c. Monday's out, Tues/Wed they're booked solid, Thur car goes in for new gas tank, so maybe next Friday?

Hmmm, I wonder if I should take the Bassani axle-backs off before they redo the dyno...

 

Well, just finished my trip back to the dyno shop. We did 5 pulls with inconsistent results (1-low, 2 high, 3 low, 4 high, 5 med). Then he disabled the dyno's atmospheric correction and did 2 more pulls with more consistent results:

Pull #6
A/F ratio: 10.6 - 11.0
HP 287.4 @ 5558
Torque: 303 @ 4163-4465

Pull#7
A/F ratio: 11.1 - 11.2
HP 285.8 @ 5606/5655
Torque 304 @ 4211/4271

I'll scan & post the chart tonight.

Now to schedule my mods and tuning...

 

You prolly did the shop, counless other customers and esp. yourself a major favor by questioning the first visits numbers. Hopefully now you have a good baseline to work from. You won't be able to direct compare to other cars run on other dynos, but you will be able to tell what benefits a particular mod has on your car. Good luck!


Paul

 

Here's the chart...
[attachmentid=20283]

 

Looks good to me......Book em Dano! Good luck with your mods.



Paul