Motorsport3

Hello all!! I know its been discussed for long time and I've searching a lot about supercharging and swapping 55 motor. I was told that 43 amg engine has low compression and at the end of the day it would make similar number to SCed 55 motor since 43 engine can take more boost, and wondering if its true. I've had factory supercharged car but had never experienced putting custom/aftermarket FI system before, so I don't know much about it.
So, someone please help me out with right direction!! Go NA all the way?? or FI and call it a day??
I was quoted for custom SC for $9500 installed and dyno tuned, and its basically HPS gen II + larger heat exhanger, fuel injector, dyno tune. Then, I found 55 motor swap out the door is about 5k and I can sell my 43 motor with less than 47k miles on it.
Please tell me what you guys think
TIA -Curt-

austinholloman

Staying NA is going to be better for daily driving reliability. If you want all power. You can build out the 4.3 motor for the HPS SC and produce a claimed 650hp.... Its really up to you. If all your looking for is the drop into the 12's on the 1/4 mile, drop in the 5.4 and don't look back. If you want to build a crazy beast, keep the motor and see other threads located here about building out the 4.3 for the HPS SC. Read here https://mbworld.org/forums/c36-amg-c...ous-power.html post # 14.

Motorsport3

Thanks a lot Holloman!!! I never thought of daily driving reliability haha. It was'nt one of my concern, I was only thinking about $ to HP ratio. So, I guess the pro on 55 swap is reliabilty and cost of the swap.

320 dreamer

i run a s/c engine and it is fine for daily driving. personally its a toy for me but i have friends with the same amd they drive it everyday. my fuel mileage is 26mpg which isnt bad.
the key to adding f/i is to tune correctly. start with low boost and stay away from tuning for max boost unless you are going to race a bunch. n/a is great but theres no better sound than a blown motor winding up!

austinholloman

My point is. There is no point to me in SCing an engine unless your going all out power. A SC engine with 600+ hp is not as good for DD as an NA motor that gives you a little more power for getting around and a whole lot more TQ. You can supercharge the 4.3 but why? If all you want is around 100 more horses? Drop in the 5.4 and headers, full exhaust with an X and dyno tune. Bam, your there and with way less moving parts you need to maintain, keep cool and or repair. Just my views. To each their own.

320 dreamer

im seeing this 600 # being thrown around a lot on here. please realize theres a HUGE amaount of work thats required to get 600 pinoes from a small engine. your c43 rates what 300 crank hp? add your mods and your getting 400 crank hp add a s/c now your looking at 500 crank hp. no were near 600 and extremely reliable to drive. the main difference is the torque curve. by going f/i the torque can be tuned to slamm you into the seat and keep you there
theres no susitute for raw power and the f/i engines will get you there in a hurry. want more power go bigger engine

austinholloman

Because there is a member here that had made 550hp with the 4.3l engine but hes spent a lot of time and money doing so. He also only drives his car 1200-1500 miles per year. Once again. If the OP just wants a little more power, skip the charger that costs 5k and buy a 5.4l and drop it in for the same price. Its a better building platform to begin with anyway.

320 dreamer

cant argue with that logic. i guess im in a unique position because my mb isnt a daily driver. more of a toy i mod for fun. i drag race mine anytime i can but its also quite docile around town.
i think a large issue for a lot of people is they want the race car ability on a daily driver and thats a combo thats almost impossible to find

austinholloman

+1000

320 dreamer

if your up and about in june maybe you can follow the e/c crew to columbus oh for the timmayfest. ill be there and a ton of fast cars. racing all night! its gonna be an awesome time. then a full blown show on sat with close to 100 mb and bmw's and all that bling that everyone has on their rides

austinholloman

Sounds great. I am very disappointed with the lack of MB support and track event here in Dallas area. Seems like all the fun is out on the west coast.

320 dreamer

you should try my area!! closest track is 1.5 hr away. the only track with any brackets is 3 hrs away they mostly dont even know what im racing. but beating stangs and nissans is still fun!

Motorsport3

Thanks for all good info guys!!
I'm getting 55 swap as soon as the motor gets here and it will be dyno tuned with Kleemann headers. I already have supersprint exhaust and resonnator on the car, so I'm hoping to get some reasonable improvements out of it. Now, I'm wondering if I should keep primary cat or secondary cat.. I donno if lost in back pressure cause any power loss....
Do anyone know if theres significant weight difference between 4.3 and 5.5?? I kind of miss bmw's 50/50 weight balance : )
If anyone wants my motor, it ha 47,xxxx miles on it and will be ready to ship when my swap is done!!

ECTurboGSX

Same basic engine, very minimal weight difference.

King320

Thats it?? $5K?? Electronics and everything? Are you talking about the supercharged motor in the w211 e55? Wonder if this has been done in a C32

Motorsport3

Thanks a lot!! I was little worried about coilover height change.

Motorsport3

Oh, I'm talking about w210 e55 motor : ) I wish I can swap w211 e55 motor in it but I think the swap is pretty complicated. With w210 55 motor, its plug and play.

Motorsport3

Hello fellas! I decided Supercharge 4.3 motor.
I think its best $ to HP.
Hope I can get some good numbers.

Timmay77

Fixed. We had 130 BMW/MB's last year. I have a feeling we will double that number this year.....