[WillLowe]

I've been a bit irritated by my remap results since I had them and wondering If anyone has had similar. I had my car mapped by evolve a while back and got about 359 bhp. I've seen other posts from people saying they got around 390 from the same map. Now I'm wondering would fitting a CSF intercooler likely get me closer to the 400 mark? I had over 420 on my last e92 335d and would like for this car to feel even close to being as fast as that one.

Any suggestions?

[Eddamoo]

Intercoolers don't increase power output. They just prevent the power dropping off when the charge air gets hot. You shouldn't notice a difference unless you sustain a high boost, assuming BMW did a half decent job designing the stock cooler.

Did you get a before and after Dyno? Dynos can't calculate flywheel figures accurately so it could just be an error.

[James-335dx]

Is that a rolling road map or a generic upload?
I had my 335d done at Durham on the dyno and went from 316 - 412 which delivers a noticeable difference on the road. No other mods apart from a back box delete and Piper filter. 30% increase in power from a remap seems reasonable so possibly you're having another issue? EGR? assuming you have a 335d a 15% increase seems low :

[jackstrath]

Originally Posted by Eddamoo

Intercoolers don't increase power output.

Not true, Simply put they do, less restriction (although thats around the 380 mark mainly but every little helps) combined with a lower pressure drop,nicer end tank designs to aid flow, the turbo has to work less which then means it works more efficiently, more efficient means more power.

To the OP - was your car dyno'd before and after on the same rolling road?
As tbh comparing anyone else's car to dyno other figures is like pissing in the wind.

dynos vary so much, and iv found over the years theres some mega high reading dynos out there, at the end of the day they are tuning tools and should be treated like such, and unless your car was dyno'd pre and post map on the same dyno you cant take it for granted your car was making stock power ect ect

Do you have dragy? Comparing cars on that with the same map would be your best bet to find if your cars down on power.

Your last 335d to break 400bhp would of had to have been running ether meth injection or have hybrids/fuel pump upgrade? They simply cant fuel the power above that, does the car feel noticeably slower?

[Eddamoo]

Originally Posted by jackstrath

Not true, Simply put they do, less restriction (although thats around the 380 mark mainly but every little helps)

I was commenting based on the OP's predicament and you only partly quoted me. Of course if the power (and resultant charge air) demand was much higher a larger intercooler would help - you do that along with other mods. Throw a big IC on a stock engine and you'll just get more weight and turbo lag for lots of cash, its a delicate formula. Ultimately it wont help a stage 1 car on a 5-6 second dyno sweep.

To expand on my other comment and to agree with JackStrath, Dyno flywheel numbers are total rubbish and incomparable - they cannot accurately calculate coast-down losses as they disengage the gearbox and the weight changes over the driven axles. Any dyno operator who mentions a percentage loss, just walk away as they don't have a clue; its not linear!

The shape of the curve is the only real useful thing you can discern from them. Simply switching tyres can cause a massive swing on fake flywheel numbers. I was once at a dyno day in my VX220 and simply upping the tyre pressures from 24 to 35 PSI increased the flywheel figure by 12BHP!

[Wills2]

Just figure the car with a dragy/vbox that'll tell you more than a set of made up crank HP numbers on a RR. (It amazes me how many people hold on to them as something to be relied up)

The actual performance numbers don't lie.

[WillLowe]

Originally Posted by Eddamoo

Intercoolers don't increase power output. They just prevent the power dropping off when the charge air gets hot. You shouldn't notice a difference unless you sustain a high boost, assuming BMW did a half decent job designing the stock cooler.

Did you get a before and after Dyno? Dynos can't calculate flywheel figures accurately so it could just be an error.

I did get a before and after yeah the before was only like 285 I think and they did comment that my engine should be putting out around 315 - 320 or atleast thats what other x35d engines usually make

[g9icy]

Originally Posted by WillLowe

I did get a before and after yeah the before was only like 285 I think and they did comment that my engine should be putting out around 315 - 320 or atleast thats what other x35d engines usually make

285 for a stock 435d is very low... Get a second opinion...

Personally I'd have had the engine looked at after getting a value of 285.

Also, try using BP Ultimate if you're not already. Makes a difference for me on a stock 435d.

Edit: also ~360 is actually what I'd expect from a remap, people claiming 390 are probably lying or getting misinformation.

[Hooded]

Originally Posted by g9icy

285 for a stock 435d is very low... Get a second opinion...

Personally I'd have had the engine looked at after getting a value of 285.

Agree.. either the RR is reading low or your car is broken

[Hooded]

Originally Posted by Wills2

Just figure the car with a dragy/vbox that'll tell you more than a set of made up crank HP numbers on a RR. (It amazes me how many people hold on to them as something to be relied up)

The actual performance numbers don't lie.

This^

My 330d is supposed to be pushing around 325bhp according to Simon from emaps but it’s never been on a RR. I have no doubt it’s around that figure now by the performance numbers in my tests, 50-80mph is quicker than a stock 335d and around the same as a stock (354hp) Audi S5 or stock (326bhp) 340i, so I don’t feel the need to take it to a RR which may or may not give an accurate reading, I know it’s quick and making good power.

[doncarlyon]

Where did you take it ?

edit: just re-read... evolve.

[WillLowe]

Who would I go to to look at getting the engine checked? I've logged some data and there doesnt seem to be any issues with boost pressure, fuel pressure, intake temps, air flow or any of the normal low performance readings. I'm thinking maybe I just got used to the stage 3 335d and am comparing the performance to that.

[doncarlyon]

Try it on another rolling road, could be your low readings are just down to the rolling road reading low in general.

Failing that, buy a faster car