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I think a 470whp GTS will absolutely **** on a 550whp AMG C63. Just saying.
It would, 911's are very efficient. They keep up with and beat cars with 100+ more hp. A C7 Z06 was only able to walk away from me from 60-130. After 130 mph the stock .2 GTS started to pull the Z06 in.
Nice graph and results M3thod, thank you for sharing and thanks for the PM. I'm fairly certain that a set of headers would propel you to 500whp.
I'm assuming this was an OTS map and not a full dyno tune?
Steve: My AMG was 605hp and I have a 991.2 GTS. The GTS wouldn't **** on my AMG, I would be watching you in my rearview.
No question that drag and rolling weight are a big part of it. Also, AWD vs 2 WD helps the GTS. But once a car is in motion, nothing beats pure Horsepower.
M3thod: I also saw that the boost on my Cobb tune was only up slightly. I think that with the stage 2 maps we will see another 10%+
I also only have cats and a filter, but I am always curious if a plenum or different muffler or even headers would improve the HP significantly.
Can't wait to see what the ideal setup is going to be
1. Headers
2. Sport Cats or Catless
3. IPD Plenum
4. CAI or BMC filter
5. COBB Tune
6. Inter coolers. (This is the biggy) Do that, with a Custom tune, and your AMG will not know which way you went.
It would, 911's are very efficient. They keep up with and beat cars with 100+ more hp. A C7 Z06 was only able to walk away from me from 60-130. After 130 mph the stock .2 GTS started to pull the Z06 in.
Nice graph and results M3thod, thank you for sharing and thanks for the PM. I'm fairly certain that a set of headers would propel you to 500whp.
I'm assuming this was an OTS map and not a full dyno tune?
Yeah, it was just the preloaded Stage 1 map for 93 octane. I believe the car makes more power than is reflected on the dyno graph. My IAT's were high due to the temps, humidity and available fan ventilation, they start around 120 @ 2500k and climb to around 140ish @ 6200-7k.
They are 20-30 degrees cooler on the hwy during the same type of pull due to the increase in air flow. In reality the dyno is a way to estimate power, I think in real world conditions its probably somewhere between my number and 500. Headers are the next move for sure and I agree. To be sitting at 500rwhp on a stage 1 map is a good place to be.
Great work M3 - thanks for posting this. Also a great outcome in terms of gains - I have to say I was cynical however your test is a clear vindication of the peak gain. Those bigger turbos aren't running out of puff - very impressive - If you have plots of boost and AFR that would be a bonus.
Couple of questions - what does it look like from 2000RPM?
and
it looks like the gains range from 15 to 50 RWHP and then at around 6000RPM the traces diverge - possibly reflecting tapering of the stock boost to redline (see graphic below) and non-tapering of the Stage 1 tune boost (peak difference 87RWHP). Is that your read with regard to the boost profile???
Just did a rough under the curve calc and the average gain is a very respectable 53HP (from ~4250 to 7250rpm)
Great work M3 - thanks for posting this. Also a great outcome in terms of gains - I have to say I was cynical however your test is a clear vindication of the peak gain. Those bigger turbos aren't running out of puff - very impressive - If you have plots of boost and AFR that would be a bonus.
Couple of questions - what does it look like from 2000RPM?
and
it looks like the gains range from 15 to 50 RWHP and then at around 6000RPM the traces diverge - possibly reflecting tapering of the stock boost to redline (see graphic below) and non-tapering of the Stage 1 tune boost (peak difference 87RWHP). Is that your read with regard to the boost profile???
Just did a rough under the curve calc and the average gain is a very respectable 53HP (from ~4250 to 7250rpm)
I just made my brain hurt trying to make this graph, but heres AFR. Which boost metric would you like? I have a full datalog if you would like to see it, shoot me a PM with your email.
Thanks for the write up I am glad to see independent tests like this!
-Mitch
Happy to share with the community. From monitoring my numbers during some spirited driving, IAT's are typically within 15 degrees of ambient during multiple 4th gear hwy pulls. As I have indicated in my post, I believe the numbers were lower than you achieved due to my high IATs (starting at 120F) and the testing conditions being so poor.
The stock IC's perform as consistently as they do in the OEM tune with the Stg. 1 map, which I am sure you guys already know!
I have the same car, but a 2018 with the same tune. I have not yet had the opportunity to dyno test or really open it up.
To be honest, as much as I love the improvement from the chart and the removal of the artificial ceiling is fantastic,
I expected higher numbers from both stock and tuned.
I am coming from a 600hp Mercedes AMG and 380, 470hp.. It just seems so low compared to the HP numbers I see on other vehicles.
I know its not all about HP, but it would be nice to see 550-600hp with a tune and minor mods..
Hey BRG,
Forgive me if I’m making assumptions here, but I think you may be missing something. The numbers shown for stock and and Stage 1 tune are at the wheel. Those numbers are always lower than the HP numbers for the engine (600 hp AMG for example.). The GTS in it’s stock state is a 450 HP car, but at the wheel it’s 400 RWHP (383 in this case due to atmospheric conditions). Therefore, the 470 RWHP Max with the tune, would be a larger number if engine HP was used.
Forgive me if I’m making assumptions here, but I think you may be missing something. The numbers shown for stock and and Stage 1 tune are at the wheel. Those numbers are always lower than the HP numbers for the engine (600 hp AMG for example.). The GTS in it’s stock state is a 450 HP car, but at the wheel it’s 400 RWHP (383 in this case due to atmospheric conditions). Therefore, the 470 RWHP Max with the tune, would be a larger number if engine HP was used.
So ! There is reason to rejoice
COBB's numbers are actually WHP per their dyno chart, but exactly like you said, atmospheric conditions and the fact that the car's IAT's were 30 degrees above what I see on the hwy contributed to my max power number.
COBB's numbers are actually WHP per their dyno chart, but exactly like you said, atmospheric conditions and the fact that the car's IAT's were 30 degrees above what I see on the hwy contributed to my max power number.
Understood. I was quoting your use of RWHP. Which I suppose is the same thing since Cobb had a rear wheel drive car on the Dyno. In that case isn’t WHP=RWHP ? Since the front wheels aren’t providing any power.
What I was trying to say regarding the AMG comparison was; the ~ 600HP number MB advertise is the engine at the fly wheel. Not the wheels. So the number seems bigger heh heh.
Couple of questions - what does it look like from 2000RPM?
Just did a rough under the curve calc and the average gain is a very respectable 53HP (from ~4250 to 7250rpm)
This was a good pick up. I was interested to see that as well. As it was a Stage 1 Tune and ///Method has Sport cats, did he loose a little bit down low at 2,000? Stage 2 should pick that back up, "IF" that was the case. Not that my car is ever below 2,000 other than stopped at the lights.
06-29-2018, 12:10 AM
heh heh.