Sleestack

I have one. I don't use it. It is a pain in the *** trying to level the thing. I think it works fairly well, however, I'd rather stick my car on a dyno to get some power ratings, then take it to a dragstrip or track and get numbers there. If you are really into 0-60 times it might be useful to you, however, I just don't find 0-60 numbers that interesting.

tery

Sleestack, how accurate is the G-Tech pro ?

Mach430

If you get it aligned properly, it is supposed to be accurate to a tenth of a second. The variable of course is whether you can align it properly... Any bumps in the road will affect the readings.

tery

wow sound pretty hard to have too a reading

theine

originally posted by arnee

Please post the graphs/numbers! I have K&Ns and the AMG exhaust also. It'd be interesting how much the UD pulleys add.

The ud pulleys will add 13 HP at the wheels, like 16.5 HP at the crankshaft.

Arnee

This is the major drawback of GTech Pro. I had it for awhile when I tweaked my SLK230 with its pulley and IC, etc. etc...

But where I live, there are alot of hills, etc. The road has to be FLAT since the GTech Pro senses G-load changes and does the math to convert it to power, given the vehicle weight (remember from Physics, F=ma??)

If you want to measure max HP with GTech, you have to be going @ top gear @ max RPM on a FLAT road the entire time....sort of impossible without getting a ticket or going to jail.

If you notice, GTech's commercials shows the Supra on the Salt Flats, that's the ideal place.

pocholin

I just borrowed a g-tech and my 1/4 times are terrible, I've only gotten 14.2s in the quarter mile when I usually run 13.3s and 13.2s in the real track. My best 0-60 mph has been 5.59 which I think is terryble, I don't trust that g-tech at all, I'm going to take it to the track and compare to a real reading (hopefully by friday)

AS far as gaining HP don't do the exhaust, so the other stuff you posted, and check the hp gains on the headers, it can't be 136 hp

theine

Eisenmann claims:

3.3 - 3.9% HP gain for the sport exhaust.
4.1 - 4.7% HP gain for the high performance exhaust.
6.1 - 6.4% HP gain for the racing exhaust.
Sound levels will increase proportionally.
6% of stock CLK430 is 16 horses!....wow.
So, if this is true, what I am doing with my AMG exhaust?

hinhin7

those numbers are what the Eisenmann claims, but is that true?
If I can get more than 10hp by only changing the exhaust, theine, maybe we can order and put them in our cars...
heheheh :-)

newguy2008

I did a search for the word "reflective" in this forum and it gave me the subject that you are talking about.

After reading some of the posts, I'm not sure if it's special "heat resistent" reflective tape that you need or if it's just aluminum tape which can be found at "Home Depot"- where it is designed to tape around the vents leading to the exterior of your house on you Clothes Dryers. It was only a few bucks, but again, am not sure if that's the stuff. In theory, it should work as well especially since clothes dryers give off alot of heat which needs to be vented out of the house.

It may be worth killing an entire afternoon to add a few more horses.

I'll do just about anything to add horses to my car but, , but is that grass roots "Micky Mousing" a car. I'm not judging, just asking for other opinions-I'm semi-considering this.

I guess that if you are operating the carin colder climates, then there is not gain since you're pulling in cooler air anyway??? So, 275 HP in November to March in Upstate New York is still 275HP with or without reflective tape. Am I wrong in this assumption???

pocholin

I have used it in my car, but it was a reflective insulating blanket from www.thermotec.com
Don't use the self adhesive from home depot, nor the one from thermotec, it falls off after a while because of the temps. But the last one I did I used thermotec's self made clamps and it seems to work good.
I did see improvements at the track on my 60' and 330' times, but humidity was so high the final 1/4 mile time was not that good anymore, I still have to try it on not humid weather, and today is sprinkling in Houston.

But the insulation of your air inlet pipes and bottom of the airbox (on the AMGs) is will worth the 60 bucks spent in materials for those ~8 HP earned.

Mach430

You will absolutely NOT get those gains from changing your muffler on the CLK! Eisenmann makes great mufflers, but it's just impossible to get those gains out of changing the muffler (unless your stock one has a sock stuffed in it).

theine

Maybe they meant to put HP instead of percentages, that would be more realistic, like:
3 - 4 HP for the sport exhaust.
4 - 5 HP for the high performance exhaust.
6 - 6.5 HP for the racing exhaust.

Mach430

That's still a little optimistic. We will never recommend a CLK muffler basd on performance, for the simple reason that there are very small gains to be had.

theine

So then Eisenmann is full of it posting this in his website?
http://www.eisenhaus.com/perfdetails.html

pocholin

They are advertising average gains for all the vehicles they've done, I'd be careful with the following note on their website:
"Average % HP gains are as follows: (note: numbers may vary based on the make and model of your vehicle)"

theine

The question here is: should I change me AMG exhaust for Eisenmann?

pocholin

I'd do the same thing I did with power chip, call them and ask them to garantee performance gains, if they agree to send you a letter stating performance gains or your money back, I'd do it. After you do it if you go gain something I'll follow because I'm looking for "cheap" ways to gain some performance too (don't want to spend 18-22 grand on a supercharger, I also can't spend that kind of money)

theine

Spoke with Jason at Eisenmann, and he says that the sport type is pretty much the same as the stock one, the high performance you'll get 3-5 HP and the racing one between 6-8 HP.
They claim those gains, and would put them in writing, but there is no guaranty, cause after the exhaust is installed they won't take it back.

pocholin

6-8 HP would mean 2 about 2 tenths in the quarter mile at the most, not bad. if they could only have a good way to guarantee.

So what are you going to do?

hinhin7

So...basically, it doesn't matter whether they put them in writing or not, because once you installed it, you cannot take it back.

To me, spending some money for muffler is only to create deeper tone and look cool.

theine

What I like to know is where does the AMG exhaust fit, high performance 3-5 HP? If so, going with the eisenmann racing exhaust I would gain between 3 - 5 HP, which is still worth it.
The other thing to consider is loudness. I wan't a deeper sound, not loud and the racing exhaust is supposed to be noisier.
What do you have in yours Poch.

pocholin

Well, my car comes with the AMG muffler, I'd have to put the racing mufler, which is about 12 db louder, and I don't want it loud all the time, I wonder if these mufflers are loud at idle thru 30% throttle.

theine

12 db is a lot. I'll be more confortable with 6 db which is what the high performance exhaust has, and should be the same as the AMG exhaust.

pocholin

Yes, but it doesn't bother me if it is only at 70% to 100% throttle.
If it is 1 or 2db at idle it is fine then.