Okay, why don't you Omey dyno your car before the X-pipe mod get the baseline numbers, AFR..etc and have it dyne again after the mod, & let's see if you have gains whats so ever.
All I know is that in comparing Jeremy Dyno number to mine, both done at the same place (Dynospeed, on a Mustang Dyno) that he has a little more HP than mine. We both have the same year with approximately the same mileage (02). The obvious difference that I saw was that my A/F ratio at the the top line is very rich compare to Jeremy, mine was around 12 and Jeremy was in the 13. So If I can get more air flow to the engine at the higher RPM, I expect to see the same HP number at the wheel. First I will check to see if my air filters are dirty, so I can easily change out the MAF, add the K&N filter and do the resonators delete and if I get the same HP as Jeremy, then it will be pretty clear.
.........the fact that your car and his car on the same dyno had different results is not really hard to believe. No two cars are the same. Some cars dyno higher than others and would have nothing to do with resonator delete or x-pipe.
agree with you there Ted, but one important thing is the A/F ratio though, that really was the difference between mine and Jeremy. Mine was around 12 at peak power and his was in the 13.
mrweelr is correct, a lot of vette guys do the x-pipe to help exaust pressure equalize b/w the two individual flowing pipes... similar to our systems. BUT, our system combines both pipes in the muffler... thus acting as a x-pipe. so, here is why i said, there is no need to equalize exhaust pressure using an x-pipe, b/c it is done in the muffler... now, if you had individual mufflers on each pipe, yea, a x-pipe would be beneficial...
Aj
P.S: anybody know the size of the stock pipe? just before the resonator or after the resonator. i need my mechanic to get the right size piping for the res. delete. thanks!
..........you are actually wrong. Exhaust restrictions do exist in the W211 E55. Infact the reason many W211 E55 owners don't get exhaust mods is that loss of those restriction points can cause you to loose boost and may have the adverse effect on torque numbers. But forget all of that.........I don't have a W211 e55. I have one of those older AMG's you speak of. I have a W210 E55.
Ted
Headers are part of the exhaust system and can add substantial gains to the 211 E55. Boost is a measure of unusable air. Of course a free flowing exhaust is going to reduce boost, you don't have as much back pressure when you free the flow. However, you will make more power with the better flow and reduced boost.
I think you may be confusing good exhaust mods with those that go too large. There is a fine line between increasing flow and reducing velocity. You have got to manage both but huge gains can be had with NA or FI engines from exhaust modifications.
Headers are part of the exhaust system and can add substantial gains to the 211 E55. Boost is a measure of unusable air. Of course a free flowing exhaust is going to reduce boost, you don't have as much back pressure when you free the flow. However, you will make more power with the better flow and reduced boost.
I think you may be confusing good exhaust mods with those that go too large. There is a fine line between increasing flow and reducing velocity. You have got to manage both but huge gains can be had with NA or FI engines from exhaust modifications.
.............No, I am not confusing anything. Exhaust mods do not yeild any HP agains in our NA MB's. Even in FI cars, the gains are marginal. Anyone that claims it does should post before and after dyno's or stop talking about it. My concern here is that people come to these forums for accurate info. Some end up wasting incredible ammounts of money based on unsubstantiated claims.
..........Having said that, headers do yield gains and I have seen many dyno's including mine with significant HP gains with headers. You are correc that headers are part of an exhaust system, but I was speaking about the exhaust system itself from CATs outwards. I have done all these mods many times over. If you are looking for HP gains, your exhaust is the wrong place to look.
Ted
Last edited by Ted baldwin : 09-14-2006 at 05:11 PM.
Ted is correct - the gains from doing mods from the cats back will be minimal, at best. You may gain a few HP by adding an H or X pipe or free-flowing mufflers, mandrel tubing etc. but don't expect anything noticeable. I believe AMG included the resonator to keep the noise levels down, but I prefer a throatier exhaust tone so I chose to remove it. I did notice more burble/crackle in the exhaust tone after removing the resonator. An X-pipe vs. two mandrel pipes in place of the resonator should help equalize exhaust pressure and improve the exhaust tone.
This Corvette setup is really nice:
Do the W211 E55's have true dual exhaust or is it a 2-1-2 setup? Do they have an x-pipe? I've never seen the W211 exhaust other than the 4 tips so I have no idea.
__________________
-Jeremy
02 MBZ E55 AMG (0-60 in 4.9, 13.5@104mph)
91 Syclone #434 (0-60 in 3.7, 11.95@112mph)
07 GSX-R 750
.............No, I am not confusing anything. Exhaust mods do not yeild any HP agains in our NA MB's. Even in FI cars, the gains are marginal.
Ted
OK, I get what you are saying. I thought you were generalizing on all exhaust systems from the engine to the tail pipe. What you are saying is correct about the stock Mercedes exhaust. Changes after the catalytic converter will yield minimal to no gains. However, I don't understand why Mercedes installs such crappy exhaust manifolds on the AMG's. Every stock Mercedes I've seen can see good gains with a better manifold/headers.
i generally agree with you all. a setup with headers, cat & resonator delete, adding an x-pipe, and high flow mufflers would give great gains over stock... but im not thoroughly convinced that just an x-pipe in place of resonator would be beneficial... the distance b/w the x-pipe and muffler is not long enough to justify equalizing the flow... if the x-pipe was placed down by the headers, it would be benefical!
anywho... my reason for not gettin an X-pipe...im cheap, i just want a nicer sound. i don't care for any more performance then this machine already has... if i want speed, i'll hope in my beast in the sig pic...
Aj
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