[jamesmurray]

Hi guys,

This time last year I ran my 335i on the Dynodynamics dyno at Surrey Rolling Road and made 436bhp and 510lb/ft running 15L of bioethanol in the fuel tank. You can read about it here;

http://www.e90post.com/forums/showthread.php?t=998694

With the bioethanol not really being a cost effective solution to everyday power I went ahead and fitted a BMS meth kit. After a few teething problems its running reliable on a 60/40 ratio.

I went back to SRR to see what she's putting down. Here's a list of mods and a breakdown of the results;

BMS RACE flash (with latest knock tables)
JB4 G5 (Map 3 with 70 additive)
BMS Meth kit (CM10 nozzle and 60/40 ratio)
Wagner Catless downpipes
Wagner FMIC
CPE charge pipe (standard recirc DV's)
Ramair duel cone filters
NGK single electrode plugs
Full tank of tesco 99

Dyno Dynamics 4wd dyno. All runs were in 4th gear (auto)




Crank: 447bhp and 530lb/ft
Wheels: 375whp and 450lb/ft

Previous dyno on bioethanol;

Crank: 436bhp and 510lb/ft
Wheels: 365whp and 430lb/ft

Stock;

Crank: 305bhp and 330lb/ft
Wheels: 255whp and 275lb/ft

I was able to log all the runs this time on the JB4, and apart from a little timing pull at the top end on 2 cyclinders it was very clean;



Overall I'm really pleased with how it performs, to go any further now will require hybrid turbos and some inlets....

James

[AlanYoro35i]

I ran 415 at SRR last year with just a cobb stage 2 tune... I now have a pro tune and i should get it dyno next few weeks and we can compare but i do expect a 450+ not on meth.. The numbwrs seem dissapointing with a meth kit to be honest

[jamesmurray]

I think you might be looking at the dynojet numbers from the states as a comparison, as they are always misleading and complete BS. Dyno dynamics rollers are known as the "heart-breaker" perhaps because they are conservative (or accurate) in their figures. I'll be hitting santa pod next week so trap speeds will be a good indication as to whether the power is low.

James

[AlanYoro35i]

If you actually read my post i said i had my dyno done at the same place as you did. SURREY ROLLING ROAD!

[jamesmurray]

I did read your post, and your comment on hoping to make +35bhp from a Cobb pro tune with no additional mods is why I questioned it. But by all means prove me wrong!

James

[AlanYoro35i]

Sorry i seem not understand your way of thinking.

I mentioned that i dyno at the same place as you did last summer with an old map. This year with a much more aggressive and refined map i would think i'll hit 450. I did not make any refence to USA dyno number or reference any american sources.

If you have been on this platform long enough you understand cobb uses more boost to achieve it's target than JB4.

I ran a sports map meaning boost wasn't as high as the agressive map, had leaky vacuum hoses and faulty wastegate boost converter. With all these fixed now i'm sure i will hit very close to your power. I've been in this platform for much longer and although everycar is different. If a N54 is FBO with meth you should be looking at around 450-480 hence i said your numbers are dissapointing.

Anyway it's obviously you taken offence by my comment about your low numbers and saying what i said is BS and misleading. I will go next saturday morning and your welcome to come over and watch the numbers!

[jamesmurray]

I think there's been a bit of a misunderstanding here! I was referring to BS numbers from the US (not your comment!) because a lot of people will directly compare to the dynos that they see in the US and immediately think that it should be producing near 500bhp. And therefore if its not making that kind of power then there's something wrong. I understand that the Cobb runs a high boost target of around 20psi, but also on pump fuel you cannot run highly advanced ignition timing because you are octane/cooling limited. I'm not arguing with your previous result, but expecting to make +60/70bhp from meth on top of an already high tune is a bit unrealistic, as the little turbos cant provide enough air at the top end to deliver any real gains in hp. The big difference would be with some RB's that can flow more air.

Id be more than happy to come along for a dyno shootout, but its just too far to travel again. By all means run it on the dyno, it would be good to see more dyno figures as we dont see enough of them in the UK!

James

[Sparky68]

I agree with Yoro, with your mods i would be expecting closer to 500bhp. We had a RR day a couple of years ago and everyone was getting more or less what was expected, phil200tdi ran close to 490 with meth.

[Cerbera9]

Nice to see tome UK figures. As above every car is different and that are many variable on a dyno that can effect the figures, last year with similar mods but minus the Meth and I ran 429bhp/490lbft. I'm looking to run mine again later this month as a comparison.

[wildjames123]

why did the tps roll out slightly at around peak torque, are you able to log DI pressure?

[windymissile]

Does seem a little low.
Each RR reads differently and are only really for comparison of different situations on the same vehicle. Cross comparisons between RR's cause lots of confusion.
Can you share the log?

WM

[jamesmurray]

Originally Posted by Sparky68

I agree with Yoro, with your mods i would be expecting closer to 500bhp. We had a RR day a couple of years ago and everyone was getting more or less what was expected, phil200tdi ran close to 490 with meth.

I think on a Dynojet it might show those kind of numbers, do you have a dyno graph of the 490bhp run by any chance?

[jamesmurray]

Originally Posted by wildjames123

why did the tps roll out slightly at around peak torque, are you able to log DI pressure?

The slight closure of the throttle happens all the time on n54 engine. From what I understand a slight closure doesn't affect power in any way. The high and low pressures of the fuel pump where fine during he runs. Ill post up a log of both runs.

[phil200tdi]

Mine ran 420hp but 520lb/ft it started to misfire badly at higher rpm..

It was only once I sorted the vacuum leak and replaced the clutch and FW that it really pulled hard. I had a wedge flash as the BMS map ran too rich at the time - may now be rectified... I never had a dyno at those levels though - expect it was fairly similar to yours. You could try upping the meth concentration?

450bhp and 500ft/lb is hauling in any case.

[jamesmurray]

Ok I cant upload an original .csv files to forum, so I've uploaded the logs to datazap for you all to see. You can click on the different toggles to see the various info. Also in the top left you can change between the two logs. Here you go;

http://datazap.me/u/jamesmurray/surr...25-26-27-28-29

[jamesmurray]

Originally Posted by phil200tdi

Mine ran 420hp but 520lb/ft it started to misfire badly at higher rpm..

It was only once I sorted the vacuum leak and replaced the clutch and FW that it really pulled hard. I had a wedge flash as the BMS map ran too rich at the time - may now be rectified... I never had a dyno at those levels though - expect it was fairly similar to yours. You could try upping the meth concentration?

450bhp and 500ft/lb is hauling in any case.

Meth concentration is the next thing to look at I think, plus I've got a 3.5 bar TMAP and adapter coming to allow 20+psi at the low end. Although to be honest I don't think there's a great deal left in it currently, as at the top end its managing to hold 17-18 psi which is already way out of the turbos efficiency range. A set of new turbo inlets might liberate a bit more headroom, but for the work involved i'm not sure if its worth it.

[russjonesr]

Always handy to have the TMAP upgrade just incase you manage to get to 20psi. It will be interesting to see how the inlets help spool. What are currently seeing at 4k rpm?

[AWSAWS]

Just had a FMIC fitted and my DCT gearbox serviced. New sump to replace the leaking one, fresh trans fluid and filter. The car is running great. No codes or misfires. Planning a run at Santa Pod to see my new trap speed and hopefully set a good ET. Actually went Sunday but queues were about a mile and a half out. Got there. It was so busy I turned back.

I keep deciding not to dyno as I don't know how reliable numbers are.



(*Note timing above is just 99Ron and water\meth. When adding in some Ethanol it's even more reliable)

[Alpine Saloon]

Nice numbers!