Jak63AMG

Hi all,

I have installed Cargraphic Headers with no primary but haven't got the chance to do the dyno testing. So today i did some dyno and the result is 393.4 RWHP and 338 RWTQ which is a gain of 23.6 RWHP and 22 RWTQ from the last mods.


So far the progress is as follows:
Stock Dyno : 309.9 RWHP 300 RWTQ
Eurocharged Tune : 351.2 RWHP
Sec cats+resonators delete : 369.8 RWHP 316 RWTQ
CG headers, primary cats delete, Eurocharged header tune : 393.4 RWHP 338 RWTQ

I'm pretty happy with the power that the car is making now and the sound is crazy LOUD now

jacob502

Dont be happy. Be ashamed. caragraphic headers alone should give you at least 35-40HP. I have seen them being tested on a one of my friend's car. How is it that your only getting 23HP?

Do you even have a headers tune?

Do you have a check engine light on?

393HP on dynodynamics especially at this time of the year is pretty low. your car should be making at least around 425HP.

something is wrong. find out what it is and fix it

Jak63AMG

Hi Jacob,

Thanks for your advice. Yes it seems low but look at the stock dyno result whic is only 309 RWHP and I'm using the same dyno to check all the modifications so I gain about 84 RWHP so far. One thing that I must consider is fuel quality in Indonesia is very crappy so always remind the tuner to be safe on AFR.

I don't have CEL because Jerry took care of it and yes it is hot and humid as hell this time of the year in Indonesia. Maybe there is something that needs to be fix and I will do some checking.

Sirex63

Jacob502 +1

That's too low , u should get around 400 with at least a tune , then pushed to 425-435 with headers.

Jak63AMG

Yup agreed but somehow this dyno is very low, i think one of the lowest in the region. Even a friend of mine E63 with weistec sc "only" reads 430 RWHP on this very same dyno

Sirex63

then why dont u just try a shot on another dyno , if the same then there's a problem

Jak63AMG

That's the problem since this dyno is the most reliable and "true" dyno among others in Indonesia. Most tuners and car enthusiasts choose this dyno

Maverick1975

How can you stand the noise of longtube headers no cats and resonators? The volume at wide open throttle will be unbearable after a while.

jacob502

Jaks,


I understand the consequences of fuel and all, but in your case it should not matter. you started out at a baseline of 309HP. you ended with around 393 by getting an ECU tune, Caragraphics headers, and deleating the secondary cats. the total HP gained is 84. A headers and tune alone should give you 100RWHP gain on any dyno. installing a catless pipe will give you about another 10-15HP extra. The gains you should be witnissig is around 110-115RWHP. Therefore, you are off by about 27-31 .You mentioned that the gains you got from your CG headers was only 24. Something is seriously wrong with your tune. Maybe you need to ask your tuner to adjust the necessary timing and ignition for your new exhust. I dont think Eurocharged worked with caragraphic before. They must have loaded a headers file for the headers that they have worked on and not yours. I know a tuner that has a a specific file for your caragraphic headers that will do magic for your car. If your intrested PM me.

Jak63AMG

Guys,

I've just been informed by the dyno technician that his particular dyno dynamics reads around 35% lower RWHP than the supposed Engine HP figure.
What is the normal HP loss from engine to rear wheel HP? 15-20%?

jacob502

If thats true, then your car is making 604 HP at the cranks. I personally think he is full of ****. a Dynodynamics dyno is the same Dynodynamics elsewhere. I dont know where he got this 35% figure. Anyway, tell him your car with your set up should still read around 420-430 RWHP

Jak63AMG

Got my PM?

golfinz

84rwhp from LTs and a tune isn't all bad...all a dyno is is a tuning device, which can be altered by the dyno operator to make all cars read higher/lower just by changing the settings. Take it to the track to see the real results. I would imagine Jerry did his job in tuning as well

C230Kompressed

I have a question about C63 tunes and sorry to semi-hijack your dyno result thread, but when you guys get tunes, are tuners loading up pre-made maps or custom tuning your car on a dyno? This may have something to do with why you are not getting full potential HP.

Although I do agree with OP, he went from 300whp to 393whp from stock to his current mods, I'd say that's about normal, and the dyno might be a very low reading dyno due to elevation/weather/last time dyno was re-calibrated etc. The most imporant is base vs tuned gain, and 93 is a good gain.

SonnyakaPig

I would say if your car is running nice and there doesn't seem to be any hiccups in drivability, then your gains are solid.

You're doing the right thing by sticking with the same dyno.

84 rwhp from stock is right where you should be given the following factors: 1) The weather is not ideal for making best power, 2) Your fuel octane isn't great so your car is not programmed to advance as much timing as it would if you were running better gas, 3) Your headers are great quality no doubt, but they're not MHP LT's which seem to make the most power for these cars.

If your car is making 600 bhp, your car is strong and right where it should be for your mods.

SonnyakaPig

Easy there. Nothing to be ashamed about. These are mass produced items on a mass produced car, so the variables are not likely related to the hardware or the car (if the car is running well), rather, they probably have to do with this particular dyno, ambient temps and fuel.

23 whp on this dyno may be a good gain because it is very low reading. There's no way to know because there are so many factors to consider when you dyno. So you can't just attach a fixed hp gain to every car around the world. In reality, the hp is there, but the measurements can vary.

Also, the headers were installed after the OP removed the secondary cats and resonator so there was already a gain from the increased exhaust flow from that modification, as can be seen in the OP's stated results. The subsequent header install, then, may contribute to less hp gain than might be the case if the headers were installed prior to the secondary cats/resonator mod.

bhamg

Exactly...well put.

loungn14

nicely done...you beat me to it...

people just have to remember that when staking mods, the overall gains don't stack. IE a pulley might gain 50whp and a tune 50whp but together they won't give you 100whp.

GHAZAN

numbers sound good, i gained about 90-100rwhp for headers/tune (catless), 91 octane....Jacob sounds mistaken. BTW most of us use 18% drivetrain loss.

W109 W211 6.2L

Yep!

Also who cares what number it reads, you gonna enter a dyno contest? If so you will lose. The only contest that matters is the street contest , there will always be other cars with big numbers. If you can get a street tune and forget the dyno numbers.

bhamg

GHAZAN - what combination did you go with?

SonnyakaPig

Thanks.

SonnyakaPig

Thanks for the post.

Good point about the stacking too.

Jak63AMG

Thanks Sonny,

Yes the car is running strong and no problem whatsoever

Merc63

Take it to the track. I wouldn't worry about dyno numbers too much. 90+/- RWHP is nothing to be ashamed of lol. That's good gains in my book!