M156 FBO power expectations not adding up. (Stock baseline and tune)
Thread Starter
Member
Joined: Dec 2012
Posts: 240
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From: Wilmington NC
M3
M156 FBO power expectations not adding up. (Stock baseline and tune)
I'm here asking about what a FBO decatted M156 should make power wise, everything I've read tells me:
470-490rwhp
But after my baseline which you will find in my other thread: (Super flow dyno, some claims it reads low).
https://mbworld.org/forums/w211-amg/...ture-tune.html
(Came here cause the C63 section offers much more knowledge and experience with the M156)
I put down a max of 421rwhp on stock Ecu software running rich 10.46 A/F.
After contacting tuners they are telling me to only expect a 25-35rwhp gain!?!?
That would only net me around 450-60rwhp total with my set up, which I'm not really happy with after seeing countless C guys put down 470-480+rwhp.
Anyone have any advice?
Thanks
Marcus
470-490rwhp
But after my baseline which you will find in my other thread: (Super flow dyno, some claims it reads low).
https://mbworld.org/forums/w211-amg/...ture-tune.html
(Came here cause the C63 section offers much more knowledge and experience with the M156)
I put down a max of 421rwhp on stock Ecu software running rich 10.46 A/F.
After contacting tuners they are telling me to only expect a 25-35rwhp gain!?!?
That would only net me around 450-60rwhp total with my set up, which I'm not really happy with after seeing countless C guys put down 470-480+rwhp.
Anyone have any advice?
Thanks
Marcus
Last edited by M-Theory; May 17, 2015 at 12:27 PM.
MBWorld Fanatic!
Joined: Jun 2008
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From: Ny
Anything W/4Wheels
Enjoy your car and dont go after dyno numbers. my car put down 465-470 on race gas with Full exhaust intakes ectttt...
car runs low 11s high 10s and does 60-130 in 7.9-8.3 in that set up. if i had another 20-30 rw who knows what it will run.
car runs low 11s high 10s and does 60-130 in 7.9-8.3 in that set up. if i had another 20-30 rw who knows what it will run.
Senior Member
Joined: May 2012
Posts: 402
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From: Chicago, IL
C63
My C63 with tune, ROW airboxes, MBH headers, mids, and x-pipe only showed 300 whp on a Mustang dyno. Needless to say I was heartbroken.
I took it to the track and it ran an 11.9 @ 119 mph and I didn't feel as bad. I found out later I also had a air leak in the intake manifold.
While I may have had awful dyno numbers and several possible reasons why, I could still feel a huge difference between stock and after mods.
Good luck with your ride!
I took it to the track and it ran an 11.9 @ 119 mph and I didn't feel as bad. I found out later I also had a air leak in the intake manifold.
While I may have had awful dyno numbers and several possible reasons why, I could still feel a huge difference between stock and after mods.
Good luck with your ride!
MBWorld Fanatic!
Joined: Jan 2009
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C63 AMG
Who cares about dyno numbers??
Bench racers maybe at cars and coffee, see Ya at the drag strip I always say.
And if you're wondering why you're down on power with a 10.4 AFR, you need to read up, cause that is pig rich for an NA car.
Bench racers maybe at cars and coffee, see Ya at the drag strip I always say.
And if you're wondering why you're down on power with a 10.4 AFR, you need to read up, cause that is pig rich for an NA car.
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Thread Starter
Member
Joined: Dec 2012
Posts: 240
Likes: 13
From: Wilmington NC
M3
I understand I'm down on power big time because the car is running extremely rich on a stock tune, which will be resolved with a tune coming soon.
My concern is that tuners are only telling me I'll only see another 25-35rwhp gain, which seems really modest from the results I've read about.
I just wanted to know if that was typical, I'm not one to get caught up in number but when I'm spending cash on this stuff I just want to make sure I'm spending it with the right company.
Even now over stock running rich the car feels like a monster in comparison so I can't imagine what a tune would make it feel like, can't wait.
Thanks for all the words and help.
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From: Los Angeles
2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
The last two post have clearly missed the point im making in reaching out to the forum for information.
I understand I'm down on power big time because the car is running extremely rich on a stock tune, which will be resolved with a tune coming soon.
My concern is that tuners are only telling me I'll only see another 25-35rwhp gain, which seems really modest from the results I've read about.
I just wanted to know if that was typical, I'm not one to get caught up in number but when I'm spending cash on this stuff I just want to make sure I'm spending it with the right company.
Even now over stock running rich the car feels like a monster in comparison so I can't imagine what a tune would make it feel like, can't wait.
Thanks for all the words and help.
I understand I'm down on power big time because the car is running extremely rich on a stock tune, which will be resolved with a tune coming soon.
My concern is that tuners are only telling me I'll only see another 25-35rwhp gain, which seems really modest from the results I've read about.
I just wanted to know if that was typical, I'm not one to get caught up in number but when I'm spending cash on this stuff I just want to make sure I'm spending it with the right company.
Even now over stock running rich the car feels like a monster in comparison so I can't imagine what a tune would make it feel like, can't wait.
Thanks for all the words and help.
Have you even re-read what you posted?
Do your research, make some calls and actually TALK to people. Form a RELATIONSHIP with the tuner you like. And then get the tune and don't look back.
All this hand-wringing over imaginary numbers is so silly. When you have a real problem, that's the time to make a post like this. Not over faulty math.
Thread Starter
Member
Joined: Dec 2012
Posts: 240
Likes: 13
From: Wilmington NC
M3
No, I think everyone gets it just fine. You are complaining about a problem that doesn't even exist. Your car is down on power stock because it's running fat. Then you want to take tuner claims for their hp gains - which for good reason are on the modest side of things - add it all up, and you wonder why the math seems off.
Have you even re-read what you posted?
Do your research, make some calls and actually TALK to people. Form a RELATIONSHIP with the tuner you like. And then get the tune and don't look back.
All this hand-wringing over imaginary numbers is so silly. When you have a real problem, that's the time to make a post like this. Not over faulty math.
Have you even re-read what you posted?
Do your research, make some calls and actually TALK to people. Form a RELATIONSHIP with the tuner you like. And then get the tune and don't look back.
All this hand-wringing over imaginary numbers is so silly. When you have a real problem, that's the time to make a post like this. Not over faulty math.
To put it in simple terms for you, I was just wondering why I was only be quoted a total of 450-460rwhp when I've seen an average of 470-490rwhp with my same mods (through the search feature btw).
I have learned a few things from you and the others that have posted, that dynos differ and the track will really tell you where a car is performance wise.
As for building a relationship and talking to tuners that's exactly what I've done (5 of them over a period of 6 months) and I've gone with the one that actually put forth the effort in understanding and educating me on what I'm trying to do instead of just looking at my money.
Seriously though I appreciate all the input on my question, I never said it was a issue, just wanted clarification.
That's what the forums are for, someone will search and see this one day and learn something haha.
Thread Starter
Member
Joined: Dec 2012
Posts: 240
Likes: 13
From: Wilmington NC
M3
After the first dyno pull we realized the cat deletes weren't the only codes it was throwing, cleared the codes and the car started to adapt more and gained power ever dyno pull, The shop I used was sure if we kept at it the stock software would possibly be around 430-40rwhp (assumption on power of course).
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Joined: Aug 2012
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From: Alabama
09 Carrera S, , 03 F250 CC FX4
Didn't realize you had these items, however row air boxes and cat delete shouldn't have any impact on a/f ratios. Actually I wouldn't have thought headers would either but I suppose it is possible as they now allow higher velocity of air to pass over the O2 sensors which 'may' not allow for a proper reading.
But I don't have the experience with this engine as I do others and these mods that are mentioned do not impact the air/fuel in other cars in this fashion.
Typically cars running to rich are a result of a faulty MAF, O2 sensors, or fuel press regulator.
But I don't have the experience with this engine as I do others and these mods that are mentioned do not impact the air/fuel in other cars in this fashion.
Typically cars running to rich are a result of a faulty MAF, O2 sensors, or fuel press regulator.
Thread Starter
Member
Joined: Dec 2012
Posts: 240
Likes: 13
From: Wilmington NC
M3
Didn't realize you had these items, however row air boxes and cat delete shouldn't have any impact on a/f ratios. Actually I wouldn't have thought headers would either but I suppose it is possible as they now allow higher velocity of air to pass over the O2 sensors which 'may' not allow for a proper reading.
But I don't have the experience with this engine as I do others and these mods that are mentioned do not impact the air/fuel in other cars in this fashion.
Typically cars running to rich are a result of a faulty MAF, O2 sensors, or fuel press regulator.
But I don't have the experience with this engine as I do others and these mods that are mentioned do not impact the air/fuel in other cars in this fashion.
Typically cars running to rich are a result of a faulty MAF, O2 sensors, or fuel press regulator.
Thanks.
Super Member
Joined: Aug 2012
Posts: 650
Likes: 20
From: Alabama
09 Carrera S, , 03 F250 CC FX4
I wouldn't randomly replace them. 70k miles is nothing on those parts
Find someone that can datalog the car on the dyno and see what those items are telling the car eec
Find someone that can datalog the car on the dyno and see what those items are telling the car eec
