Need Advice on Adding More Power to HPS SC
Here is my dilemma! Jim and Bill told me to pick up the car today and drive it for 150-200 miles before bringing it back to them next week so that Jesse would be ready to program it. So far Jesse has not even confirmed whether he will accept the project/engagement or not, let alone when he can do my car.
Jim says he has no place to store my car so I have to pick it up. I don't like this at all because I am being forced to take back a car that is not ready and with potential harmful effects to my engine (too rich fuel dries up the cylinder walls) and my catalytic converters (gets superhot trying to burn off the extra fuel). Plus the fact that I would have to drive back and forth to Escondido which is over 170 miles from my house with a Rental car. This is B.S customer service IMHO!
Although I appreciate their efforts to fix my car at their expense (fuel injectors, pulley kit, filters and possibly programming) it really doesn't mean much if the OUTPUT is not there even if the INPUT is. A whopping 335rwhp is simply not acceptable when compared to their advertised claims. I truly doubt whether the HP will improve by more than 1% after 150 miles of driving.
We pay the price for performance. That is the bottom line and so far I am not getting it.
Did you get your car dyno'd at HoP or not? Did you witness it? If you did please post it. We are both recent HPS customers and should expect to get what we pay for. Prove to me that it is only my BRAND NEW car that was the EXCEPTION.
If you didn't know about cars, now you do. Having a supercharger has really taught me a lot about making safe power. I'm greatful you are willing to share your experiences with the other board members, because it is educational and can maybe help others in the future.
Did you get your car dyno'd at HoP or not? Did you witness it? If you did please post it. We are both recent HPS customers and should expect to get what we pay for. Prove to me that it is only my BRAND NEW car that was the EXCEPTION.
No i didn't dyno at HOP yet but i will soon. I understand your frastration but be patient with Jim and Bill. They are doing their best right now with the software. Wait until the software is done then decide.
If you didn't know about cars, now you do. Having a supercharger has really taught me a lot about making safe power. I'm greatful you are willing to share your experiences with the other board members, because it is educational and can maybe help others in the future.
The Best of Mercedes & AMG
I hate to say it, but this is exactly why I didn't purchase the HPS kit months ago for my C55. When I talked to Adam & Bill (though they were quite nice) they couldn't give me any meaningful answers to my questions befitting "technically inclined" people. Frankly, I've dealt with these tuning issues before on my BMW's and it's a joke if someone expects it just to work right & adapt by only changing the injectors. Also, there were many tricks required (even with the older OBD1 DME's) to force the computers adaptation into working with you, instead of fighting you. Many inexperienced tuners (when I was more involved back in the late 90's) took the incorrect approach to ECU reprogramming, and the ECU simply worked to undo what they've done as the car was driven.
I can't say for certain what's happened here without far more information, but I'm way too skeptical to believe that simply bolting on a s/c and larger injectors & relying on the ECU to adapt will work on any car, even one with a more advanced modern OBD2 DME. Also, if you have a basic tuning problem from the changes that were previously made (original s/c & injectors), just throwing more new parts at it is probably the worst thing to do until someone figures out the TRUE CAUSE of the problem, and not just trying to cover up the symptoms. Any of this of course figures the basic parts are still functioning within their designed range. I thought I remembered hearing your car ran OK for the first week or two, correct? So ask yourself what changed & why...
Read Fast 55's post yesterday on the SLK55 board. He only gained 5rwhp after a 420rwp preliminary pull which is 1.1% after he gave the ECU time to "learn".
It's the transmission that can adapt more as you drive. For example, your shifting pattern as you acclerate, etc... The body control portion is for your acccessories like temperature control, etc..
I don't believe HPS and Mech Tech have figured out the TRUE CAUSE which in my opinion is the computer! Maybe the reason my car is causing them so much headache is because it is a 2006 model with only 600 miles on it when they installed the kit.
Last edited by AMGSC; Feb 1, 2006 at 11:49 AM.
Regarding your second statement...Then why did it not gain any significant power when the injectors were changed out? The 25+ hp came from the pulley kit and air filters, not the injectors even though the A/F ratio was now super rich at 15-1.
Why don't you just go get your car dyno'd in your presence and let's hope you are still that optimistic when it's YOUR car. What are you waiting for?
1. There is no need to replace injectors if the goal is to make lmid 400s at the wheels. Proper FMU is enough to fuel the motor up to 450 RWHP. Just look at Kleemann (Dragons C55 makes 440s)
2. When one does replace injectors, DME needs to be reprogrammed to accomadate higher flow of fuel. That means all of the fueling maps will need to be rescaled. I doubt that who ever is doing programming has the knowledge or the ability to do it.
In addition, beside flow rating, every injector brand has its own slope graph. In simple terms, every injector flows different amount of fuel per pulse width per fuel pressure. This curve is programmed in DME's software and also needs to be properly scaled.
What I leading to is this - TUNING is a very complex operation that best left to an experienced software engineers who have many years of programming experience, understand engine theory, have access to the car and to hundreds of hours of dyno time.
AMGSC - you are ginny pig for HPS. In my opinion, even if they do manage to get your car to run half-way decent, there would be some kind of damage to engine as a result of their inexperience.
HPS lied to you before, why do you think they will not lie to you again?
Take that refund offer and go with a proven company.

Regarding your second statement...Then why did it not gain any significant power when the injectors were changed out? The 25+ hp came from the pulley kit and air filters, not the injectors even though the A/F ratio was now super rich at 15-1.
Why don't you just go get your car dyno'd in your presence and let's hope you are still that optimistic when it's YOUR car. What are you waiting for?
RE: Check out hps c55 dyno chart!!!
Vdoc,
First off your wrong about who's dyno is who's. HoP dyno'd "AMGSC's" C55 not SuperC55 that you are reffering to.
Here's the deal sport......... I have $1,000.00 that says you can not beat my CLK 430 at a 1/4 dragstrip with your HPS tuned CLK 430. Put up or shut up smiley. Your playing in a big boy's game now.
The TRUTH shall set you FREE!
Looks Like Josh wants to step up to the plate with a $1,000.00 for a Put up or shut up at the 1/4 track...HPS vs HOP Both with the CLK 430 systems.....
This sounds like a Great time for a GTG...
I Say Bring it on!
This sounds like a Great time for a GTG...
I Say Bring it on!
The best advice I can give you is to get your refund and go with the Kleemann setup.
Last edited by dragonAMG; Feb 1, 2006 at 02:20 PM.
1. There is no need to replace injectors if the goal is to make lmid 400s at the wheels. Proper FMU is enough to fuel the motor up to 450 RWHP. Just look at Kleemann (Dragons C55 makes 440s)
2. When one does replace injectors, DME needs to be reprogrammed to accomadate higher flow of fuel. That means all of the fueling maps will need to be rescaled. I doubt that who ever is doing programming has the knowledge or the ability to do it.
In addition, beside flow rating, every injector brand has its own slope graph. In simple terms, every injector flows different amount of fuel per pulse width per fuel pressure. This curve is programmed in DME's software and also needs to be properly scaled.
What I leading to is this - TUNING is a very complex operation that best left to an experienced software engineers who have many years of programming experience, understand engine theory, have access to the car and to hundreds of hours of dyno time.
AMGSC - you are ginny pig for HPS. In my opinion, even if they do manage to get your car to run half-way decent, there would be some kind of damage to engine as a result of their inexperience.
HPS lied to you before, why do you think they will not lie to you again?
Take that refund offer and go with a proven company.
The hardware needs to be baselined & the software reverse engineered enough to know where & how to change the code. We're not just talking a few lines here either. There needs to be much dyno testing while tuning it in, and street driving in different conditions & altitudes as well, all with adaptation turned off. Then the adaptation can be turned back on after everything is dialed in correctly by someone who knows how. Lots of luck if they can do that properly in a couple days...
Maybe we can setup a GTG in March. I know there's the Pasadena Rosebowl meet in March. I'm going to go to the AAA auto club office for info and ask if we can reserve a day in March for dragstrip runs at the California Speedway. It would be awesome if we had the Rosebowl meet and dragstrip runs the same day. I want to test the new engine in March, especially since I have a California Speedway/AAA membership now.
Vdoc,
First off your wrong about who's dyno is who's. HoP dyno'd "AMGSC's" C55 not SuperC55 that you are reffering to.
Here's the deal sport......... I have $1,000.00 that says you can not beat my CLK 430 at a 1/4 dragstrip with your HPS tuned CLK 430. Put up or shut up smiley. Your playing in a big boy's game now.
The TRUTH shall set you FREE!
Looks Like Josh wants to step up to the plate with a $1,000.00 for a Put up or shut up at the 1/4 track...HPS vs HOP Both with the CLK 430 systems.....
This sounds like a Great time for a GTG...
I Say Bring it on!
HPS lied to you before, why do you think they will not lie to you again?
Take that refund offer and go with a proven company.
Get a refund, take all their crap out of your car, and get it inspected to see if any damage has been done to your car...expecially the motor. If there is damage and they refuse to compensate you for it...I would start thinking about talking with a lawyer.
Good luck
Good luck
http://www.1320video.com/vids/12.28RedRumDyno.wmv
http://www.1320video.com/vids/12.28RedRumDyno.wmv
I was referring only to the practical fwhp limits of a MP112 and how he may acheive his goal of 600hp. I would assume that any work that is done would be professionally setup which would include tunning... the correct tuning
Did my post did not say that adding NO2 would solve his current tuning issues? NOPE
Last edited by John Long 55; Feb 2, 2006 at 09:46 PM.
http://www.1320video.com/vids/12.28RedRumDyno.wmv
They are using a stck 2g 7bolt long blck with stck rods and pistons at 35lbs of boost? How do you spell DOPES!
That is the main reason why that motor blew.The stck small 7 bolt rods cannot deal with that kind of boost on those dyno pulls.
That's why they flew out the side of the blck! Back to Mario's post! Yes I do agree with Mario that all the car needs is proper tuning.The splt second piggy back seems pretty impressive and has wrked wonders in tuning gregc's car(S/C CLK55). Just throwing in those big injectors and expecting the ECU to compensate is retaarded on HPS's part.I'm really surprised and dissapointed that they would just flood the motor with bigger inj without properly custom tuning the ECU to compensate for the change.Amazing!
If this keeps up you will be saying goodbye to that motor . Get the splitsecond system and let Josh tune the car with the HPS system.All you need is proper tuning with the stck injectors.If you keep those big injectors,you will certainly need the piggy back to retune the car.If you are going headers cams ,port and polish ,I would probably keep the bigger injectors if you are gonna continue using the HPS system.But you will need the piggyback.
I love the way the splitsecond system can control timing and fuel trim.Get that and you'll be happy with the HPS system.Give it to Josh or GregC and let either one of them tune away!
I was referring only to the practical fwhp limits of a MP112 and how he may acheive his goal of 600hp. I would assume that any work that is done would be professionally setup which would include tunning... the correct tuning
Did my post did not say that adding NO2 would solve his current tuning issues? NOPE

They are using a stck 2g 7bolt long blck with stck rods and pistons at 35lbs of boost? How do you spell DOPES!
That is the main reason why that motor blew.The stck small 7 bolt rods cannot deal with that kind of boost on those dyno pulls.
That's why they flew out the side of the blck! 





