Maybe someone can clear this up for me or at least give me some logic because I just don't get how manufacturers market their products...

Ok anyways renntech's performance package (pulley+ecu) claims a gain of 45 horse power crank horsepower I assume... http://renntechmercedes.com/R170_SLK.html Now when you look slightly bellow their performance package they also offer an ecu remap without the pulley set that they state gives a 25 horse power gain..? Now this confuses me a little... because an ecu remap to give a larger performance gain could be possible....but...

Second then i decide to take a look at the evosport site and compare the pulley sets.. or at least what they say about their pulley sets... http://evosport.com/product/proddeta...VO.PER.M70.P12
Is the link to their just pulley upgrade without the ecu remap.. the claim is 30 horsepower with a dyno showing an increase of 30 rwhp... Next i take a look at their package with the ecu it claims that together with the ecu the set gives "50-60 rwhp" http://evosport.com/product/proddeta...VO.PER.M03.S01 and it tuned to take for 91 octane, but isn't renntech's tuned to for 93 octane? and it states C32 AMG with this package has 400 hp...? how can this be possible because if the stock car has 349 to the crank and 50 horses to the rear wheels are added there is no way that the crank would get no less than 410?

Now i know that renntech uses tuned stock pulleys while evosport manufactured their, something just looks wrong... 45 Crank HP from renntech performance package and 50-60 rhwp from evosport?

Some how i feel that although there is a difference in performance it just is not any where near this vast... I feel like someone is overrating or someone underrating?

If anyone can clear this up for me it would be really helpful... since both these sets are priced the same I am taking my time to decide which way to go...

Thanks,
- Sid

 

I just ordered the Renntech kit yesterday. They will remap your ECU for 91 or 93, take the red line up about 200 RPM and get rid of the speed limiter. They are claiming a 45 h.p. gain and 60 pounds of torque, also they don't sell a pulley kit alone. It's either a ECU upgrade or a pulley & ECU upgrade together. I went with them mainly because of the name and reputation, I believe they have been around long before all the other guy's. I was told that just doing a pulley kit would cause your supercharger to heat up too.

 

Couldn't wait just another day...

 

thanks for the info, but it wasn't exactly what i was asking... i am aware of this information already... i am interested why one claims 45 crank horses with 93 octane in mind and other claims 50-60 rwhp with 91 octane in mind... why such a huge difference?

 

you really should of waited, my car is na and i cant imagine how much power i would have made with a supercharger. their supercharger kit (ecu flash, tune, pulley) made 344 whp. and its alot cheaper, you wasted your money.

 

haha agreed.

renntech cost a fortune and SI's ECU tune, (PROVED) to be doing as much or even more than the renntech one, and cost a fraction of the cost!

btw, evosport is a dealer, they make their own parts, but i'm not sure if you should get their ECU. might as well get it from SI, and if your EAST COAST NY (area) loca, there's even a group buy for it.

 

I'm really not sure about these questions, and wasn't that concerned about the difference of 5 or 10 h.p. My main concerns were more about safety and reliability of the product that I was buying. Renntech has been doing the performance work for years on these AMG engines, I would rather spend a little more money and know I went with a company with years of experience and a good reputation.

 

A fraction of the cost? I've seen no prices for a comparable kit to the Renntech kit for the SRT6, so can you tell me what this fraction you are talking about is? I'm more concerned about a reliable product, from what I understand from Renntech if you have a warranty problem with your car Chrysler will have to prove that Renntech's kit caused it and if they do so Renntech will cover the cost of repairs. I just hope the guy that just got his car tuned by SI won't be starting a new thread called "Name That Ping" in the future. I would gladly pay a little more money for a product that has a long history and reputation just to feel confident in what I bought.

 

yes by no means am i saying you made a wrong decision what i am asking is why are their claims so much less than those of evosport... also the claim only a 10 horsepower gain for an ecu remap on the 320 non supercharged, when speed invasion was able to do over 20 to the wheels...? i don't know if that's the key to reliability or is it just too conservative.

 

So what is SI charging for the tune, pulley and ecu flash? Is this 344 whp on 91 or 93?

 

I was told by Renntech that other companies say they can get you the h.p. to get the you to buy it, but of course that's coming from a company thats trying to make a sell to me. In my opinion it does have to do with being a little conservative to have a reliable and safe product. In the case of the guy that got his car tuned by SI, the car was on a dyno so they could tune it in "just right" for that car. But not all cars are exactly the same from the engine all the way through the drivetrain. In what I read about his tune it was retuned three times to get this out come, so if I was the guy at the magic table and was wanting to make sure I was not putting someone's car at risk and someone sent me a ECU, I would probably do the second remap just to be on the safe side. The only way to tune a car to get all you can out of it is to have it on a dyno to get input from the changes that you have made to see how much farther you can go with the adjustments in the ECU.

 

Steve,

Realize though, we have over 20 different tunes to reference, and quite honestly, we could have the car literally tear apart it's transmission for the sake of power (which, sadly, other tuners might go for), but all our tunes are conservative and within safety specifications. We are aware (financially) of the problems this industry entails... else we wouldn't be doing what we do.

Yes, every car is different, which is why we take a different adventure everytime we see an ECU and see how maps differ via VIN# - no car is the same and we take this into account on all our tunes (dyno or not).

 

Advanz made a post that I had wasted my money by going with Renntech, that the SI kit was a fraction of the cost. So I replied to ask just exactly what the fraction was, but I did not get a reply, so I really don't know how much money I wasted, HA. As for the 91 or 93 question, in my opinion a company that is claiming the higher H. P. gains are probably going with 93 so they can crank up the timing a little more. From the info I've received about the remapping process it's not all about timing curves and octane, it also has a lot to do with air/fuel mixture verses RPM's and a whole lot of other crap that I know very little about, so I better just stop with the info stuff before I stick my foot in my mouth.

 

The ~344 WHP/350 TQ ECU flash is mapped for 91 octane (so east coasters can expect even better).

 

Thanks for the info JP@SI, is this just with an ECU flash on a SRT6? And you are talking at the wheels and not the flywheel?