Those are some impressive gains. What size pulley was used on the E55?

 

180 MM

 

Serge,

Thanks for the clarification, but the numbers still seem a bit off to me. It seems that with Stage 2 mods, you are saying you picked up ~86.3rwhp with that CLS and ~70.4rwhp with that E55, again doing just pulley/ecu/heat exchanger/shorty headers (I understand the E55 did not have your headers)???

-m

 

The E55 does not have shorty headers......both cars are dyno tuned.

 

Can someone help me understand this? The dyno graph shows VERY HIGH HP but seems to have low torque.

This the complete opposite of my setup, where I have high torque but low HP.

 

The torque scale is on the right hand side of the graph. It makes the graph a little strange to read, since I typically like to see the horsepower/torque curve cross at 5252 rpm, but that won't happen if there is two scales. You can see it happen in your graph AZIPOD.

-m

 

Wow! now it makes sense. He has high torque and HP.

I wonder what happened with my HP!!!!!

 

I understand the E55 does not have shorty headers, but nonethelesss... 70-90rwhp from stage 1 (plus or minus headers) and a dyno tune??? Does this not sound strange to anyone else?

-m

 

2 years ago, it would sound strange to me too. But with what ive seen done lately with dyno tuning, on both my personal cars, as well as Serges projects. Im a firm believer that Dyno tuning is the key to quite a bit of horsepower. I saw both cars in question on the dyno, along with several others, and the numbers are real. This Im sure will be hard to swallow, but My car gained 60 rwhp from dyno tuning with Powerchip. I couldnt believe it myself

I guess everythings getting bigger and better on our E55s. I still have the old evo pulley on mine, small evo reservoir, I can only Imagine the gains in HP/TQ when I slap Serges 180 mm and go with a trunk reservoir.

 

Serg you are 100% right with all your figures

I am in Australia and e55 komp's on a DD dyno are making around 400rwhp.

There is a tuning work shop here in sydney that is the only tuning work shop that i know of in sydney that has the program to give a full tune to the ecu not only a flash but a full tune.

They tune your car with stock HEADERS, STANDARD PULLEY and NO COOLING MOD oh yea all they do is drop in K&N filters.

With the full stock car with k&n 's with a full tune NOT FLASH and they get 35 to 40rwkw gain so you leave there with about 335 to 340rwkw! so with just a pulley alone and re tune you would hit the dyno figures serg is saying!!

So serg you a spot on keep up the strong tunning

 

What is the stock pulley size? Anyone know?

I understand that tunes like LET, Powerchip, etc. are basically ECU flashes that rewrite the A/F ratios and default octane setting, but what other elements of the ECU do they adjust?

I'm running the original ASP pulley (177.6mm?) and want to find the proper amount to increase my A/F ratio. After I set it to 12% increase, the car still feels slower than when I didn't touch the ECU. Thoughts...?

 

If I'm not mistaken...the stock pulley size is 165 MM? Anyone feel free to correct me please.

 

most tunes don't change octane settings. besides a/f, it's the timing and tq limiter parameters that need to be altered. for the most part, after the secondary air injection pump recall, it's no longer possible to show gains with a pulley unless you get an ecu tune.

 

Im not too sure about that. I am running the 178mm ASP pulley, and before I touched my ECU (but after the pump recall) my car was stronger than any E55 I'd ever driven. I would easily pull on RT stage 1 cars.

Recently, I adjusted my A/F to be a 12% increase in fuel because data was showing that I was running pretty lean. (I was told that the 178mm ASP was the largest one could go without having to do an ECU tune). Also set the minimum octane rating to 87. Now the car feels slower than before

Should have just gone with an LET or Powerchip or something instead of trying to manually tune it I suppose. Im thinking of just going back to stock since the heat wasnt that bad (plus I drove without a tune for about 3 years on it). Once PTE's thermostat is installed, I'd stay 178mm on a stock ECU is safe...and FAST

 

Thank you.....

 

Hi,

Can someone explain what the difference is of installing say a 172mm pulley v 180mm pulley please. This is with no other mods apart from an accompanying tune / remap.

I've been told that the max boost increase with a pulley kit is 0.2bar as beyond this there will be a requirement for further mods especially one's that help cooling, is this the case?

Would a 180mm pulley and tune yield a larger bhp gain with a 0.2 bar boost increase than a 172mm pulley, or do they both yield the same bhp gain but with different power delivery across the rev range?

Thanks
Jules.

 

Anybody

Thanks
Jules

 

as long as your car can deal with the extra heat, you'll gain more power across the board with the 180. imho, without cooling mods and headers/exhaust, i wouldn't go over 178 (with a good tune) at the most.

 

Thanks for this, so with no cooling mods (I am in the UK) a 178mm pulley kit plus remap should yield the best gains?

Do you know how the size of the pulley relates to boost etc?

Jules.

 

sorry, don't know the exact figures for boost as it relates to pulley size but i have seen it posted before.

 

Seen 15 pounds with 180mm pulley with no other mods.

 

Thanks, is this with just a tune and no cooling mods? If so did the car run ok or did it experience power loss due to excessive heat?

Thanks
Jules