sneakyneon

So here the deal, I went to the track with my only mod being a rear trunk mount water tank and upgraded pump, I ran 3 pass's @ 112 and figured this as ok with the track conditions, It was 90 degrees outside at 300 feet above seal level. Ok since then I installed a 178 pulley, K&N filter, and 3 inch exh. deleted the 2nd cats and removed the res and put in high flow magnaflow mufflers. I go bck to the track and run 3 pass's at 112 this time it was 68 degrees outside, I did try and ice down my supercharger for an hour and it netted me a 115 mph trap speed. Plus I have raced a friend of mines e55 with before and after resuts being the same if not slightly worse. I've data logged the boost and there does not seem to be any real isues with belt slip?
Is it all cause of not having a tune? Am I wasting my money on future mods with out tuning the car?
Some other area of the car that I'm overlooking?

jturkel

i/c pump failure?

you should be fine without a tune.....you just wont see all the potential hp without it. your times should not have worsened unless the conditions were dramatically worse. like a skyhigh DA, high temps, and such.

shardul

iTrader: (1)

IMO the ecu makes the engine run rich with all the additional boost hence you don't gain any power. get a tune and you will be happy.

sneakyneon

The DA wasent great, I foget what it was though, I kinda doubt the pump is failing, Its mounted in the trunk so its easy to check wile its running, plus I made some crazy high speed pulls for 30 miles sunday with 2 other e55 and one cls55 both of the e55's had shutdown issues wile mine as ok. I wonder if my pump is to big?

sneakyneon

Yes its rich but not crazy rich
Not trying to be a know it all but heres a good look at my AFR. I want to get a tune but I want to wait till some of the companys come out with a hand held tuner. I think its oing to be worth the wait. Going to be geat to be able to flash betwen a 92 and 100 octane map!

prodigymb

i was in the same boat. i got all the things done and could not break into 11s until i got a tune. i did around 12 passes that day all 12.0-12.3 range trapping at 115-116. got a tune and went 11.8 the next time at the track then 11.71 with more rpactice then 11.66.

you car will feel faster from the gain in torque but it looses some top end without a tune.

AZIPOD

I drove my E55 for about 2-weeks before I got a tune after installation of the 180mm pulley. It drove like crap. However, after the tune my butt-dyno told me the car is a lot more powerful. Get a tune done and you'll be happy.

Ali_E55

i found that mine doesn't have a tune ><

i went back to the tuner and he always says it has a tune

i feel the car is better then before but not i big bang in preformance

who can do online tuning !!

shardul

iTrader: (1)

no one does online tuning, but you can give some tuners a deposit and they will ship you a laptop with all the instructions on how to reflash the ecu and load their file onto your car.

Jakpro1

Just trying to get in your head for sec.

Wondering why you would spend all this time and money on mods and not get the ECU tuned?

Been on this forum for years and gotta say, I think that you have done the most mods I have ever seen without getting the ECU flashed.

Just found it interesting and was curious as to why?

Talked to many MANY tuners and they all seem to say the same thing, without telling the ECU to relax, it's seeing additional boost, other parameters etc, and trying to compensate for it (opening bypass under throttle body etc)

ECU next for sure bro.....you won't be sorry. In fact with all those mods, you are gonna be really pleased.

AZIPOD

+1. From what I can understand, doing a pulley without a tune can be very dangerous.

Jen_Kenne

Interesting data. Modifications to a car should always follow the concept of Pareto Optimality. Good luck.

bassn_07

Hey Jerry, I'm not sure if that's completely true. My friend, even though he hasn't called me in a while , has headers, and air filters that ran extremely strong. He ran a 11.8xx at 118 mph with a 1.9xx 60' time. I believe he was running a 168mm pulley.

With that said, I also don't understand why people would mod this far without a tune. If I couldn't do the package together, for whatever reasons I would definitely wait until time or money permitted me to. There's no doubt that a stage 1 package will give you the most bang for your buck. Plus this mod package will prolly give you the most gain over any other mod you'll add on after this, besides nitrous. From here it really starts getting expensive. JMO.

Edit: He has no tune...I initially put he had a tune and he doesn't.

stevebez

You have to do a tune... when I just had a pulley the car had more low end torque but I doubt it had more top end power.

After the tune the car's power felt more distributed over the revs ... not just bottom end.

You wont be sorry... get a reputable tune done... and preferably one that is customised to your cars mods and has your car on a dyno.

220S

Although in the real world, how can one ever know how one mod is necessarily affecting the other mod without a complex addition and subtraction game?

I'm guessing that's why we should slowly add the mods, one at a time, and then the ECU remap to get it to conform to all the bolt-on mods

TopGun32

I'm a walking testimony that 178mm pulley with NO tune is worst than stock.. specially at the higher Rpms.

The by pass valve just lets all the extra boost out and timing gets pulled.

Search for a my dyno review when I got my first LET tune and you will see that I gain close to 80 RWHP from the tune.

I dynod 380/390 and with tune I was hitting 470 RWHP.

I waited 1 year to tune my car, due to cost reasons and ease of install. Now that most tuners can flash your car with OBD2 and price is much cheaper, it should be easy a must mod.

Recently I got a reflash of a newer LET tune and man.. my car is very strong from 2k to redline. First time in a long time I can feel my car very healthy at all rpm levels.


For my C32, (it does NOT have a bypass valve, therefore tuning was optional. But once I got that tuned, the car performed even better)

rberga1

If you've had your car at the dealer within past 2 years, the dealer may have flashed it with the 2006 air pump recall which added some TQ limiting software. The torque limiting software would pull timing, bleed boost, and dump fuel. Stock I was running 118mph traps. After a pulley and no tune I was running 110mph traps. You can read all about it here

https://mbworld.org/forums/w211-amg/...-1-4-mile.html

TopGun32

Bingo! You speak the truth.

I had the same issues.

Jen_Kenne

Exactly! If you change more than one thing at a time, it will be impossible to determine which change gave you the result.

sneakyneon

Thank you for all the input, Its good to know my results are not out of line. I agree that a tune is important, I just can't belive what they charge plus with the option of hand held tuners at half the price in the near future I still think I'll wait and see.