First I would like to thank everyone that helped me out on pointing me in the right direction on my last post. I have talked to a number of vendors but could still use some of the wisdom on this board.
I would like to go with a pulley upgrade along with an inter-cooler and pump upgrade as well to start with. The question I have is this: what size pulley? 172mm, 176mm, 180mm?... and should this be done in tandem with a smaller supercharger pulley? My goal with this car is to add as much horsepower and torque as possible, but do it in a safe way and keep the car within character. I have a dedicated 1/4 mile and track car so I don`t want this pristine 2006 E55 to become one of those. I also do not want to spend a ton of time tuning this car to "get it right". I am already deep into a 1200hp street car, and one project right now is enough. So.... what is the consensus... is a 180mm crank pulley too much? I would also like to do headers. At this point a 172mm with inter-cooler, pump and headers is the direction I am going. Can all of you please give me your opinions. Thank you in advance...I do appreciate your time. - Walt

 

I think the best set-up on these cars for a driver is a SC pulley, headers, heat exchanger. That's close to 500hp at the wheels and you can drive the **** out of it.

 

The 172, Heat Exchanger, Pump, and Headers is a perfect bump in HP, without running into fuel issues, and larger throttle body driveability issues.
Do it. You'll be plenty happy.

 

We have the 168mm crank pulley and smaller supercharger pulley on one of our shop cars and love how it drives.

 

This!!!

 

You have to ask yourself how far you are willing to mod. From what I have seen there are 2 thresholds of modifications the distinction between them being fueling system upgrades.

Scenario 1 no fueling mods needed
-SC pulley or 168mm or 172mm, boost generated will be about 12 psi
-Heat exchangee and bosch pump
-Kleemann Headers

Scenario 2 FUELING MODS WILL BE NEEDED FOR SAFETY
-180mm and up crank pulley, or any crank pulley bigger than factory compounded with a SC pulley
-kleemann headers or long tube headers
-with the above mentioned setup the stock 74 mm throttle body will be the bottle neck in the system so you would have to upgrade to 80 mm or 82 mm throttle body.
- if the car has more than 70k miles change the fuel filter and fuel sending unit.

 

Hey Shardul, in scenario 2 the fueling mods would be 550 injectors and what else..? Excluding fuel filter etc.
Edit: Also would a H/E and Bosch 010 pump with a trunk tank be able to handle the cooling for a 180? How bottle necked would the system be without the TB?
Thanks!

 

550cc injectors and looped rail is optional

 

Sorry Shardul updated that last post with more questions right when you posted!

 

heat exchanger and tank will be good for the 180 mm.
The rear tank does add volume to the system but eventually all the fluid will heat stock. Benefit of the rear tank is to add ice during runs.

In terns of the intake the 74mm will be a restriction with a 18 0mm

 

So as far as HP gains how much of a difference could someone expect from stock from a 172-174mm to a 180mm? Considering everything else would be stock with the exception of cooling/fueling?

 

25 to 30 rwhp

 

Thanks for the clarification Shardul!

 

The perfect DD/Sleeper: Upper pulley, headers, tune, HE, IC pump. 500rwhp on tap.

Done.

 

How bad does fuel mileage suffer from this group of mods, when your not on the gas all the time.

 

so with a 168mm lower, headers, if you were to add a smaller upper pulley 550cc injectors are needed? has anybody logged duty cycle with stock injectors and these mods..

 

This

 

Don't tempt me..

 

Agreed
Not much
This
No sir. Maybe 475 with the right tune and temps.





IMO a 82 tb with long tubes, HE and pump, would be a perfect daily driver. Trunk tank and pulley would be needed for track use. But the tune IS important. Stock boost is fine. But once you up the boost, you need to up the fuel( injectors). No need for the looped rail, I never had one. Air box and intake tubes do help, a lot. But not needed for DD.

 

Why risk it for 400 bucks you can have peace of mind .....blown motor is a lot more than four or 500 bucks

 

So RBJ what would recommend mod-wise for a DD ,that I would like to be able to run 11.5-11.7's trapping 120 or so? Pulley combo etc. Any insight is valuable from you! haha

Thanks!

 

That is pretty easy I ran a 11.7 @ 121 on 19s with just a 185, HE, and intake.

Since then I have added 195, 82TB, MBH LTH, injectors, KC, meth and trunk tank. Haven't ran it since all that was added as I don't really care about track times, I only went once 2 years ago.

So it really doesn't take much.

 

185 is a bit large though isn't it? Seems like it would generate a lot of heat.. But I mean now you have a wagon wheel on there haha
I'm leaning toward a 180 and tune with a H/E and DR'S first. From there I plan to go with Kleeman shorties.. I'm just wondering if it will get too heatsoaked with just the H/E and the bosch 010 and lose driveability. Texas heat is always sucking power... 85+ degrees today..

Thanks!

 

i agree, i am still learning about these cars and the limitations of the stock parts. for 500$ I agree more injector won't hurt.

 

Tb, headers, HE, pump.
More boost would create more heat. Headers are a cooling mod. I'm in SoFlo and we live in heat and humidity. But you could have 11.7- 11.5 all day with this set up.