Dyno results - Map 2

[mitchyboy]

First dyno session today for my Stinger. I wasn't able to attend due to work commitments, so I set the JB4 to map 2 prior to dropping the car off. (Thanks @Terry@BMS for the info in other thread about getting mechanics access - will try to get that sorted before next session).

I'm a little disappointed with the results - 264kw at rear wheels. Expected closer to 300, if not more.
JB4 map 2, Borla exhaust, JT intakes, JT intercooler, GFB BOVs, 98 octane fuel.

 

[Joeygt]

Torque figures look impressive!

 

[mitchyboy]

Yeah torque looks good, but power seems down. I didn't get any logs because I wasn't there unfortunately. AFR also looks fine. Low to mid rpm was good, but seemed to run out of puff in the mid to high rpm range. The tuner/mechanic thinks it is due to having stock downpipes and stock midpipes, so turbos aren't able to push out enough air... which makes sense, but I've seen other people with more impressive dyno runs with similar mods and no downpipes.

 

[ecko04]

It's a factory turbocharged engine, all your power is low to mid. Smaller turbos will not give you much up high.

 

[mitchyboy]

It's a factory turbocharged engine, all your power is low to mid. Smaller turbos will not give you much up high.

Ok i get that but why do some Stingers get 330kw at wheels (such as Jonny Tigs Stinger which is identical to mine except for different exhaust and he has uncle chip vs my JB4 which is supposedly better), but mine is only 264kw? That's a big difference.

 

[ecko04]

Ok i get that but why do some Stingers get 330kw at wheels (such as Jonny Tigs Stinger which is identical to mine except for different exhaust and he has uncle chip vs my JB4 which is supposedly better), but mine is only 264kw? That's a big difference.

I’ve said it before and I’ll say it again, no two dynamometers are the same, even if they’re the same brand.

Different operators, different vendors, different elevations, different cars, different weather, different humidity, different tires, different pressure in the tires, different correction factors, dyno software version, etc. all make a difference with the final numbers you see.

This is why you don’t dyno your car simply after you’ve done changes then compare to everyone else. It’s meant to be used as a tool to gauge your individual car and is really only useful when you have a baseline before your mods. You want to chart the gains, not the end result.

When we lose sight of the purpose of the dyno is when you go down the rabbit hole of, “...but their car has the same x, y, z as mine and it made...”

 

[Manaz]

264kW ATW is about 330KW at the flywheel, or about 450hp. That's up from 365hp (272kW).

That's far from poor.

 

[Terry@BMS]

Curves look good, as does boost and AFR.

Without a same day baseline on map0 it's hard to really quantify the results. I always encourage people to seek out a dynojet machine if they intended to compare on the internet as that is the only brand that is somewhat consistent.

 

[Manaz]

Dynojets seem to be limited to bike tuning use in Australia. Dyno Dynamics and Mainline are the two primarily found dyno types in Australia.

 

[mitchyboy]

Curves look good, as does boost and AFR.

Without a same day baseline on map0 it's hard to really quantify the results. I always encourage people to seek out a dynojet machine if they intended to compare on the internet as that is the only brand that is somewhat consistent.

So boost looks ok? I only ask because the mechanic running the dyno mentioned that boost seemed to be dropping more than he expected at high rpm.
I know it's hard without logs, so next time I will definitely attend and get logs to match up with the dyno results.

 

[mitchyboy]

Another question - which gear will get the best results on the dyno or doesn't it matter?

 

[StungnTn]

5th

 

[mitchyboy]

5th

What's the reason for this? Just curious

 

[ecko04]

What's the reason for this? Just curious

It is generally recommended that pulls be done when the transmission is in its 1:1 ratio. For the Stinger that’s 5th gear.

You’ll find a lot of debates about whether it matters if the ratio isn’t 1:1 and folks on both sides of that argument. But for the sake of consistency I adhere to 1:1.

Chassis Dyno Guide - Frequently Asked Questions About Dyno Tests - Hot Rod Magazine

But if you really want to get down in the weeds here you go:

Dyno runs in a 1:1 gear ratio? - NASIOC

 

[Metalmania82]

I'm a little disappointed with the results - 264kw at rear wheels. Expected closer to 300, if not more.
JB4 map 2, Borla exhaust, JT intakes, JT intercooler, GFB BOVs, 98 octane fuel.
]

Anyone know what those numbers equate to in HP and TQ?

 

[Manaz]

Anyone know what those numbers equate to in HP and TQ?

About 360whp. 590 ft.lbs if they corrected for gearing correctly (gearing multiplies torque).

 

[Metalmania82]

That was my similar situation. AWD, JB4 Map 2, DIY intakes, rear cat delete, Borla cat-back, 93 octane......370whp 510wtq

 

[SteveCo]

Anyone know what those numbers equate to in HP and TQ?

For future reference, just ask Google for any conversions, via voice query or typing, what you want done (dimensions, weight, volume, currency, etc.) - it's got every conceivable conversion you might want, and the results are immediate!