At last !

Got my car booked in on a brand new 500bhp rolling road at one of the local tuners.

At present I have stainless semi race system from the downpipes back ( decatted ), Viper 2 chip running on the standard throttle body and standard BMW air filter.

Having a power run with it in that spec, then the garage will be fitting the race manifolds and downpipes, I will quickly change to the big bore throttle body, and then drop in the K+N panel filter, then to finish the job another power run etc.

Will post the results back here for those who were interested before.

Sadly I cannot afford to do a power run inbetween adding those bits, it would be nice to have a run after each of those other bits were added of course. This should at least give people a general idea of what gives power and what doesnt ?

If I can strike a deal with them I may see if I can have a seperate run for just the BBTB and K+N as these are the bits people seem to ask about more than anything else on the forums.

My viper2 chip was optimised by Jason at chippedUK for the BBTB aswel btw.

Gonna stick my neck out here and make my guestimates , be nice to post back and see how close they are once the runs are done.

Current Power Est: 165 at the wheels, Around 195 - 198 flywheel.

With Manifolds: 170 at the wheels, Around 204 at the flywheel.

Plus BBTB + K+N: 172 at the wheels, Around 206 at the flywheel.

The above is based on a conservative 20% transmission loss ( which is maybe on the generous side ).

Gonna fill the car with optimax aswel as im nearly needing a fresh tank of fuel anyways.

Hi Sleeper, This thing seems to be one of those ones thats "depends" who you ask, be very interested to know what you have based your theory on etc, this would at least enable me to make a more accurate calculation once ive been on the rollers ?

Cheers

24.7% is the losses on this vehicle.

This is why many rollers give different results.

@ mark - this is the figure that has always been used for my BMW's both E34 & E36..

This is very much Jay's field though!

Thanks chaps......

Slight change of plan, I will be having the run in current spec, then changin to the BBTB + K+N panel and having another power run.

My mate has offered to do the manifolds etc with me but cant do it until the weekend, I will go back and have another power run sometime in the near future instead, this will actualy probably be more useful to the average forum member anyways as most people generaly go with the Viper2 chip, BBTB and K+N and stainless exhaust from what ive seen which is basicaly the spec im taking down on thursday.

thanks for doing all a service!

will you be posting graphs?

Hell yer, this is the kinda stuff I woulda killed to see in advance of spending a few hundred quid LOL, maybe a mod could edit this topic once I get the results and pin it for the other members etc ?

Every car is different and I appreciate that, its good to have a rough guide tho.

Cheers

Mark.

Defo.

Should apply to E36 with M50 too.

By Jay's figure for trans loss, I gots me over 200 bhp!!woo!

Following is with:

Downpipes back full stainless and decat + Viper 2 Chip.

Best of 3 runs.

All power is at the rear wheels.

152.9 bhp @ 5450rpm
147.2  NM @ 5450rpm

Please note I haved traced over the lines with bold pen so it would show up on the scanner properly.

Same spec as above but with Big Bore Throttle Body + K+N Panel Filter.

156.5 bhp @ 5900rpm
142.0  nm @ 4800rpm

As above but replaced the K+N and put the std BMW Air Filter back in.

151.8 bhp @ 6050rpm
142.0  nm @ 5200rpm

Looks that way..

thats a big drop with the std filter!

Torque is a bit more ironed out with the mods, even though you have lost 5nm, you have more constant push elsewhere.

Whats it like to drive though??

P.s. I got 160.5 RWHP from mine with the BMW filter in... hmmm...

Good work mark!

are you sure that's NM?

it has got to be lb/ft. You should have 181lb/ft as standard.

were these all done on the same day ?

in this case the results wont be worth much as you never gave the ecu even a tenth of the time it needed to adapt to the extra flow of the throttle body.

You need at least 50 miles for the ecu to adapt to the extra air intake.

No worries Jayson, its going back next week for more runs after we have fitted the manifolds etc this weekend. I reset the ECU and gave it the 10min burn in time btw......

this isnt enough with the throttle body though.

in reality 200-400 miles is needed for the carbon to build a seal ring round the joint to the manifold from the throttle body so the air flows smoothly.

it is not common for cars fitted with a bored throttle body to actually lose power just after being done.

but give it time and it will reap rewards i guarantee you.

Well its still fitted atm, did over a 100miles yesterday runnin around, see what gives when I take it back for the next RR session.

Have you any ideas where I could be losing the Torque Jayson ~?  Im a long way off the std even without the BBTB and K+N etc....even further away with those fitted !

Just FYI, I have new Lambda, new MAF, both brand new genuine Bosche parts............cost a fortune lol.....

Looking at getting the fuel filter replaced and fuel pressure regulator checked before I got back with these manifolds on etc.

Cheers

Mark.

i have to agree with sleeper.

what gear did they do the run in ?

definately wrong labels on the graph!  ???

I added the BHP and Torque labels if thats what you mean ?

If your refering to the torque, well if its NM it works out 130 ish ft/lbs of torque, and if its already ft/lbs on the graph its still down by some 40ft/lbs ??? Thats the biggest no brainer for me anyways.

Run was done in 3rd gear Jayson.

he did the runs in the wrong gear mate.

your car needs to be done in 4th as this is the 1:1 drive.