Has anybody Dyno'd 93 Octane setting???
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From: Boston, MA
2004 C32 AMG
Originally Posted by AaronC
That is quite a statement. There are quite a few that are MORE accurate then DYNOJET. In fact, DYNOJET dynos are notoriously inaccurate. They are used for people who want bragging rights, not accuracy.
BTW - I dynoed my mustang cobra in San Diego on a DynoJet and when I moved back to Boston, dynoed again on a DynoJet and the #s were very similar. As for bragging rights, I don't think think this is true. On a dyno dynamics dyno, I made 15rwhp more than on a DynoJet.
Vadim, everyone here so far has only speculated that the setting doesn't give much of a power gain, but I haven't seen any dyno #s proving this to be true or not. In a 350hp vehicle, we aren't going to be able to feel a difference of 5-10hp, so if I'm making around the same power stock as everyone else, then we know what has been speculated, is in fact true.
Last edited by hantzis; Aug 11, 2004 at 10:47 AM.
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C32/Porsche356A/MB4matic/Audi 200 Quatro Turbo
Originally Posted by hantzis
Cool. I scheduled the appointment for changing to 93 octane on Thursday. The dyno day is again on the 28th. It is unfortunate that I can't get before and after dyno results, but if I'm making more hp than most stock cars, we'll have a pretty good idea if this setting is bogus or legit.
There are no two motors coming from AMG with the same HP.
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From: Boston, MA
2004 C32 AMG
Originally Posted by bmw instructor
If you do not know what you got for HP before you change to 93 you are wasting your time and your money.
There are no two motors coming from AMG with the same HP.
There are no two motors coming from AMG with the same HP.
But you make a very good point about my dyno results proving anything. Ideally we would like to do before and after dyno results. It is unfortunate that the dyno shop is just too far away from the MB dealership to make it worth my while. If I make 290+rwhp, however, with the 93 octane setting, we can make an educated guess that the setting did do something. It is too bad that starr diagnostics system isn't so expensive. If we had the unit at the shop, we could do before and after dyno results right there.
Last edited by hantzis; Aug 11, 2004 at 10:54 AM.
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From: Richmond VA
C32
The DYNOJET is a Inertia dyno. Inertia dynos tend to overstate horsepower because the rollers have momentum the faster you spin them the more momentum they have. A roller dyno, like the DYNOJET is only so-so accuracy wise due to tire pressue (also affecting tire diameter), slippage, wheel weight, etc. These types read high on HP, making it easier to brag to your buddies.
Another type is the Dyno Dynamics dyno, which uses rollers, but measures using load supplied by an electric retarder/PAU. It is more accurate then the inertial type, but becasue it is a roller type, it still suffers from the variables listed above.
A better type of dyno is a load dyno like a DYNAPACK, which applies a variable but extremely precise hydraulic load via a fixed flange coupling to the drive wheels by hooking directly onto the wheel hub. Because there are no tires on the car, there are almost no variables. Tire diameter/pressure/slippage/etc, doesn't affect the reading.
Another type is the Dyno Dynamics dyno, which uses rollers, but measures using load supplied by an electric retarder/PAU. It is more accurate then the inertial type, but becasue it is a roller type, it still suffers from the variables listed above.
A better type of dyno is a load dyno like a DYNAPACK, which applies a variable but extremely precise hydraulic load via a fixed flange coupling to the drive wheels by hooking directly onto the wheel hub. Because there are no tires on the car, there are almost no variables. Tire diameter/pressure/slippage/etc, doesn't affect the reading.
Last edited by AaronC; Aug 11, 2004 at 10:58 AM.
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C32/Porsche356A/MB4matic/Audi 200 Quatro Turbo
I agree with all!
Originally Posted by hantzis
I'm not wasting my money since I'm looking for a baseline dyno result for my C32. BMW instructor, getting baseline dyno results before you modify gives you a point of reference, but I'm sure you know that But you make a very good point about my dyno results proving anything. Ideally we would like to do before and after dyno results. It is unfortunate that the dyno shop is just too far away from the MB dealership to make it worth my while. If I make 290+rwhp, however, with the 93 octane setting, we can make an educated guess that the setting did do something. It is too bad that starr diagnostics system isn't so expensive. If we had the unit at the shop, we could do before and after dyno results right there.
But you make a very good point about my dyno results proving anything. Ideally we would like to do before and after dyno results. It is unfortunate that the dyno shop is just too far away from the MB dealership to make it worth my while. If I make 290+rwhp, however, with the 93 octane setting, we can make an educated guess that the setting did do something. It is too bad that starr diagnostics system isn't so expensive. If we had the unit at the shop, we could do before and after dyno results right there.
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From: Boston, MA
2004 C32 AMG
Originally Posted by AaronC
The DYNOJET is a Inertia dyno....
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C32 AMG
AaronC: Sorry, but you are wrong. DYNOJET 248c produces very accurate numbers. Please do not base your arguments on magazine articles or "so-called" exports. I have had and used DYNOJET in my shop since 1997 and has proven it's consistency and accuracy many, many times over.
Hantiz: You are right, operator error is the greatest problem with other chassis dynos. Also some of them do not even use SAE correction, resulting in overstated numbers.
As far as a dyno graph of 91 setting vs. 93. I have it in the database, I will try to find it and post it. As I recall they were both just about the same.
Hantiz: You are right, operator error is the greatest problem with other chassis dynos. Also some of them do not even use SAE correction, resulting in overstated numbers.
As far as a dyno graph of 91 setting vs. 93. I have it in the database, I will try to find it and post it. As I recall they were both just about the same.
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C32
Originally Posted by vadim@evosport
AaronC: Sorry, but you are wrong. DYNOJET 248c produces very accurate numbers. Please do not base your arguments on magazine articles or "so-called" exports. I have had and used DYNOJET in my shop since 1997 and has proven it's consistency and accuracy many, many times over.
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As far as a dyno graph of 91 setting vs. 93. I have it in the database, I will try to find it and post it. As I recall they were both just about the same.
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As far as a dyno graph of 91 setting vs. 93. I have it in the database, I will try to find it and post it. As I recall they were both just about the same.
When you post the 91 vs 93 setting results, please state what octane gas were you running at the time of the test.
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C32 AMG
DYNOJET does not allow you to change any of it's settings. You simply strap the car on and perform acceleration run. Weather conditions are entered automatically through a weather station. One can not alter anything else. So there is no chance for operator error.
We used CA91 gas.
We used CA91 gas.
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From: Richmond VA
C32
Originally Posted by vadim@evosport
We used CA91 gas.
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2004 C32 AMG
As someone else mentioned (maybe not on this post), I went to the MB dealership to have the setting changed and found out that 2003+ models don't have the option to change base 91 to 93 octane 
Guess I have to start looking into an EvoSport chip
Guess I have to start looking into an EvoSport chip
Last edited by hantzis; Aug 12, 2004 at 08:54 PM.
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C32
Originally Posted by hantzis
As someone else mentioned (maybe not on this post), I went to the MB dealership to have the setting changed and found out that 2003+ models don't have the option to change base 91 to 93 octane
Guess I have to start looking into an EvoSport chip
Guess I have to start looking into an EvoSport chip
From my understanding there are 3 settings, 93, 91 and the North America setting for our ****ty standard gas (factory setting for North America). I have a 2003 and it was changed to the 93 octane setting and I only use 94 octange gas. Many have had the dealer not understand. Find a different dealer.
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From: NH
C32/Porsche356A/MB4matic/Audi 200 Quatro Turbo
Change to 93 octane
Originally Posted by hantzis
As someone else mentioned (maybe not on this post), I went to the MB dealership to have the setting changed and found out that 2003+ models don't have the option to change base 91 to 93 octane
Guess I have to start looking into an EvoSport chip
Guess I have to start looking into an EvoSport chip
This is what I did in the beginning before I negotiated my sponsorship with MB of NH to run the C32.
Now that I have brought the dealership additional business they can't do enough for me.
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From: Orlando
CLS55
I'm trying to get a understanding of this topic.
I have a SLK55 on order; When the car arrives at my dealer sometime in October, should I just tell the dealer to change the octane rating to 93?
In the N/A V8 Engine, how much more hp/tq would I get? Even if it's the lowest of numbers, I would do it.
Is this possible on a SL55 as well? What would the numbers be on a SL55?
Thanks,
I have a SLK55 on order; When the car arrives at my dealer sometime in October, should I just tell the dealer to change the octane rating to 93?
In the N/A V8 Engine, how much more hp/tq would I get? Even if it's the lowest of numbers, I would do it.
Is this possible on a SL55 as well? What would the numbers be on a SL55?
Thanks,
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From: Orlando
CLS55
Originally Posted by bmw instructor
I am not familiar with the computer in your car.
But I will take that into consideration and ask my dealer next time.
