My Dyno Report:
The start of the test:
Some people may be wondering what we are talking about 'equal length pipes' and what that means. Well anything that vibrates creates what's called resonance and harmonics. This is the true meaning of 'Tuning' an engine, not just setting the timing. Equal length pipes will all 'resonate' or vibrate at the same frequency, thereby keeping the engine 'balanced'. The cylinder ports will not be 'off balance' with equal pressure on each one. With unequal pipes, there is different pressure on each cylinder and that throws the engine off balance. So if each of the exhaust pipes is exactly the same length, there is the exact same pressure and vibration on each cylinder. It won't have pressure X on these cylinders and pressure Y on others and pressure Z on the rest. All are equal and the engine is balanced.
Here are some other things we discussed:
He is Polish and learned his craft over there. That is why he is familiar with MB's and their needs and differences. He has worked on them over there and has done a lot of 124 work too.
Headers: He is going to take my car for a week and mold and bend the pipes to create the equal length headers. He says it will clear the steering box and he knows about the heat issues and says to stay away from chromed pipes because they retain more heat. Base price for a set of pipes will be $1200.00. He said if you want them out of Stainless that will be an additional 800 in material and maybe a little more for labor. He is going to take my set of pipes and make a jig so that he can replicate them for production for you guys. They can be finished however you want them for an additional fee and he will ship them anywhere. You will need a pro exhaust shop to have them installed though because I am sure it will need severe mods to it and it will be beyond most members capabilities here.
Heads: He is going to use the AMG heads we have to copy the porting and he will also polish them out and see if that is the optimum porting (not second guessing AMG, but hey! Gotta check to be sure because of "modern" techniques!). $800.00 to port and polish a set of heads to AMG specs.
Cams: He is going to copy the AMG cams we have and copy the angles and see if that is the optimum performance too. He can make them "Hotter" if wanted or needed. I am going with the stock AMG lobe profiles. I want mine to be as close to an old school AMG engine as can be produced today. $800.00 to grind a set of AMG replica cams.
Intake Manifold: He is gong to P&P that too and I am going to have the outside polished out to a high gloss as well as the VC's, C/C servo, brackets etc. $400.00 to port and polish the IM.
AFSP (Air Flow Sensor Plate): This is important and gauges the amount of air demand the engine needs and is taking in. This has a tension spring that holds it closed under a no load situation. As the engine revs and needs more air, a tension spring allows it to open, however this spring is usually hard and tight. But if it is too loose, it will be open too much and will richen the car too much at the wrong time throwing off the performance. If it is too tight, not enough air will get in the engine and it will starve performance too. So he says he knows how to adjust the tension on the spring to give optimum performance. He will do this as part of the $400.00 tuning fee.
Ignition: He says he is well versed in Bosch ECU/EZL's and can fine tune the car a little better than stock to adjust for the headers. He can also install an aftermarket one if wanted. $1500.00 to $2500.00 depending on the model selected plus a $400.00 "Tuning and Dyno fee".
Valves: He is going to do a "3 angle" valve job for $350.00.
Complete exhaust systems: He is going to fabricate my complete exhaust system from front to back. It will all be completely tuned and smog legal. Twin HP cats going back to the rear. Don't know how I am going to do the outlets. I have twin AMG chrome tips, but I would like quads. He says no problem if I can get another set. I may have the twin pipes (this will be a real twin pipe all the way back design) go into a single can with twin ins and outs and just use the twin tips I have now... But I REALLY like those quads...!
Real Horsepower increase: My car had a baseline of just under 200 HP at the wheels. Tom says that he believes he can get my car up to just under 300 HP at the wheels with all of these mods, with the HP at the crank at about 380. With a total price of between 5000 and 6000 installed, including the engine swap. I will be starting with the RÜF motor which is a HC motor. My goal was 350-375 HP so that is over what my best hope was so that will be well worth it. That will be about a 50% increase in HP for like 5 grand or so.
If anyone else wants any of these mods, let me know and I will put you in touch with Tom directly. I am NOT profiting from this at all... I am doing this for my car, and passing the info on to you guys so that others who want more performance in the AMG vain can get it. I am not saying that this will be an AMG motor, but a replica based on AMG designs with all of the advances of the past 20+ years incorporated using modern materials and techniques.
I will append to this as more info becomes available and I will start a thread on the engine mods as they progress..