Predator Dyno Numbers for those Interested

[GaPonyFarm]

Installed the Predator tune on Saturday and ran it on a dyno today (6-2-04). I installed the tune as it came from Diablo, except that I firmed up the shifts for my automatic. No engine performance changes.

Previous Dyno Results from 4-4-04
rwhp = 274
rwtq = 297

Todays Results (Also SAE Corrected)
rwhp = 281
rwtq = 308

Gains = 7 rwhp & 11 rwtq

All went well except that the A/F ratio went to 12.2, so I think a bit more power is to be had in leaning it out to 13.0 - 13.3 or so.

Any thoughts?

[chevysRslow]

Those are pretty good numbers. I agree there's probably more on the table if you lean out the A/F a bit. Pls post the torque curve if you can.

[Red03Shaker]

how many miles you put on ur car between then? also how many miles total? thanks.

[dcpatters]

Originally posted by GaPonyFarm
Installed the Predator tune on Saturday and ran it on a dyno today (6-2-04). I installed the tune as it came from Diablo, except that I firmed up the shifts for my automatic. No engine performance changes.

Previous Dyno Results from 4-4-04
rwhp = 274
rwtq = 297

Todays Results (Also SAE Corrected)
rwhp = 281
rwtq = 308

Gains = 7 rwhp & 11 rwtq

All went well except that the A/F ratio went to 12.2, so I think a bit more power is to be had in leaning it out to 13.0 - 13.3 or so.

Any thoughts?

Impressive numbers considering your car is an auto. Same here :THUMBSUP:

That is about what is to be expected. As cheysRslow posted, how about the mid-range and the overall curve.

[GaPonyFarm]

I don't have a scanner, but a synopsis of the torque & power curves go something like... I hope this helps!

What I did notice from comparing to previous charts is that the curves smoothed out a great deal from previous runs and the power & torque came in a little sooner (from lower rpms). We did have a bit of a problem getting the car to run up, without kicking back into passing gear, which is why the test starts at such a high rpm level. Miles at last dyno was around 3500 (4-4-04), today I turned 4300.

RPM..... lb tq..... HP
3593.... 278.6.... 190.6
3629.... 283.9.... 196.2
3703.... 290.6.... 204.9
3815.... 295.0.... 214.3
3928.... 297.7.... 222.7
3966.... 298.2.... 225.2
4082.... 302.1.... 234.8
4121.... 303.8.... 238.4
4199.... 307.5.... 245.9
4238.... 308.2.... 248.7
4277.... 308.7.... 251.4
4316.... 308.6.... 253.6
4434.... 308.3.... 260.3
4510.... 306.8.... 263.5
4549.... 305.2.... 264.4
4625.... 302.8.... 266.6
4737.... 300.6.... 271.1
4813.... 298.2.... 273.3
4924.... 296.1.... 277.6
5033.... 292.3.... 280.1
5069.... 290.7.... 280.6
5105.... 288.7.... 280.6
5175.... 285.3.... 281.1
5209.... 282.9.... 280.6
5243.... 277.5.... 279.8
5276.... 277.5.... 278.8
5373.... 269.4.... 275.6
5436.... 263.5.... 272.8
5559.... 257.4.... 272.5
5648.... 251.5.... 270.5
5707.... 247.3.... 270.2
5794.... 244.3.... 269.5
5842.... 241.8.... 269.0
5850.... 233.0.... 259.5

[Vegas Mach1]

Ok call me stupid but I'm trying to learn. I saw a 5-speed Mach get a dyno and his peak HP was around 6,100 RPM. Do the auto's lose that much power? Look at the drop-off of the HP after the peak. Can some explain why the auto's are nearly 1,000 RPM less when reaching the top HP range?

Should this info be used to program the Predator as far as shift points?

Thanks, confused in Vegas

[chevysRslow]

Vegas, you are right. HP peak is about 1000 rpm too low. Autos and manuals should be the same.

[2k4mk1]

Originally posted by chevysRslow
Vegas, you are right. HP peak is about 1000 rpm too low. Autos and manuals should be the same.

No autos redline at 5800 5spds redline at 6800 the peaks are not in the same place.

[Mach1 w/Shaker]

GaPonyFarm-
Here is a quick spreadsheet I threw together with the numbers you have posted, nice numbers for an Auto:

[chevysRslow]

Talking about HP peak... not where redline is indicated on the tach. I believe both the auto and manual are rated at 305 HP @ 5800.

Data above does not seem right if HP is peaking at 5100 rpm. Maybe wheel slip on the rolls?? :confused:

[GaPonyFarm]

Thanks MACH1 W/SHAKER for making the spreadsheet.. Its looks pretty close to my graph.

As far as the Horsepower readings go. Wheel slip is out of the question. Two dyno runs produced almost identical graphs when overlaying one over the other. Hitting max HP in the the 5,000 range is the norm for my Mach, from the 5 dyno runs that I've made. Max power to the rear wheels has little to do with max power at the crank, due to parasitic loss from the drivetrain and gearing of the transmission and rearend. I can't conceive of a way for the power curves for automatics and 5 speed transmissions to be the same. The gearing is just too different.

I'd be very interested in seeing numbers from other automatics for comparison purposes.... maybe I'm missing something.

[Vegas Mach1]

Ok we have a Predator now, we can raise our auto's red line, so that limiting factor is gone. Now if I'm turning my engine at say 5,800 RPM why would my HP & TQ be THAT much lower, I under stand drive train loss theory but gee this much?? I have to get to a dyno...

[JusMachN]

The strange thing is that my peak HP was at 5170 with a 5sp at 4K miles, which is only 5 RPM diff from your peak. I heard there was 2 peaks on the 5sp but not sure since they only ran me up to 5700. I guess I won't know if there is a second peak until I take it back in again after I mod my exhaust.

Mine was done on a dyno dynamics dyno which is a load bearing dyno like a mustang dyno.

[Mach1Canuck]

Either that graph, or the dyno are off.......

HP = RPM X Torque / 5252

Therefore the lines must cross at 5252.

Just pointing that out.


NM, just noticed you used a different scale for the 2 Y-axis....

[Mach1 w/Shaker]

Originally posted by Mach1Canuck
Either that graph, or the dyno are off.......

HP = RPM X Torque / 5252

Therefore the lines must cross at 5252.

Just pointing that out.


NM, just noticed you used a different scale for the 2 Y-axis....

Thanks for pointing that out. The chart is fixed now and both Y-axis' are on the same scale.

[GaPonyFarm]

Originally posted by JusMachN
The strange thing is that my peak HP was at 5170 with a 5sp at 4K miles, which is only 5 RPM diff from your peak. I heard there was 2 peaks on the 5sp but not sure since they only ran me up to 5700. I guess I won't know if there is a second peak until I take it back in again after I mod my exhaust.

Mine was done on a dyno dynamics dyno which is a load bearing dyno like a mustang dyno.

When a bunch of us got together in Marietta, GA to dyno our Machs, they ran the auto up to around 120 mph/5700 rpm and they took the 5spds up to about 140 mph/6800 rpm... at least that what it was looking like on the computer screen. I didn't notice "where" the 5spds made the max HP, but I'm pretty sure I didn't see 2 peaks on anyone's chart.

I do know that when you wind those 5spds up to near 7000 rpms it sounds like the engine is about to jump out of the car! :D