[doughboy]

Originally Posted by 335rocks

I can understand that a leak in the vacuum system can maybe cause erratic boost behavior, but this would not be dependent on boost pressure.

Sort of, the DME will adapt for small vac leaks at normal boost levels by just adding more PWM to the solenoieds, where plenty of vac margin is available.

However, at say 50% greater boost, a 50% greater force is required to pull the wastegates shut against increased exhaust pressure, this is where vac leaks will show up much more and the system may be unable to reach the target (or WG oscillations may occur even giving overboost codes), thus the error codes.

[Sparky68]

Cant wait to get this sorted so i can feel what the car is really like with 370ish bhp.

[zltm089]

Originally Posted by 335rocks

Did they tell you which injectors they replaced? If not maybe worth to give them a call and ask. Perhaps your misfiring cylinder may be one they didn't change?


Interesting! Did Darren Woods change the DV's or did BMW do that when they changed the actuators. If they were changed separately, did you feel any difference?

In terms of the actuators then the waste gates are open by default and closed using vacuum. I can understand that a leak in the vacuum system can maybe cause erratic boost behavior, but this would not be dependent on boost pressure. Even on stock map you should feel issues here? Can you remember if the car was throwing 30FF & 3100 errors?



Misfires are a pain and you really need to problem isolate this by pulling codes over a period of time and see if the misfire always happens on the same cylinder. If it doesn't try to swap the coils between two cylinders and see if the misfire moves. It stays on the same cylinder, try to swap two spark plugs and re-test.

Have you had your injectors replaced and have you had any intake cleaning done?

Darren Woods changed the DVs and we took the car for a road test....the boost leak codes were still coming on at full throttle and was getting reduced power warning light.

The code was the 30FF one.

No issues at all on stock map.

All 6 injectors were replaced about 16k miles ago...


no intake cleaning done...

I will be switching coil packs and play around with the spark plugs soon...removing all the screws and covers is a real pain though...

[fastloop]

Originally Posted by doughboy

Sort of, the DME will adapt for small vac leaks at normal boost levels by just adding more PWM to the solenoieds, where plenty of vac margin is available.

However, at say 50% greater boost, a 50% greater force is required to pull the wastegates shut against increased exhaust pressure, this is where vac leaks will show up much more and the system may be unable to reach the target (or WG oscillations may occur even giving overboost codes), thus the error codes.

Makes sense. So if this is the case the WG DC should be quite high if this is the problem. Would the DC also be high if there is a leak elsewhere?

[fastloop]

Originally Posted by zltm089

Darren Woods changed the DVs and we took the car for a road test....the boost leak codes were still coming on at full throttle and was getting reduced power warning light.

The code was the 30FF one.

No issues at all on stock map.

All 6 injectors were replaced about 16k miles ago...


no intake cleaning done...

I will be switching coil packs and play around with the spark plugs soon...removing all the screws and covers is a real pain though...

Ok so in your case it sounds like bad actuators were the cause. Shame it's a 5-6h job to replace them which pretty much makes it last on the list to try unless you are in warranty. Even to inspect them properly is a DP off job.

Practise makes perfect. I have lost count how many times that cover has been off. I can swap a couple of spark plugs and coils in less than 15 min, but it helps having an electric screwdriver.

[Sparky68]

Can you take a quick look at this and tell me which ones i need to look at/replace ?
http://www.realoem.com/bmw/showparts...75&hg=11&fg=45

thanks

[phil200tdi]

Just buy about 5 metres of silicon vacuum hose and cut to size, the BMW items are silly money for the same thing.

Buy a vacuum gauge like this:
http://www.amazon.co.uk/Draper-59075...3325803&sr=8-3


Follow the BMS DIY to test them:
http://www.n54tech.com/forums/showthread.php?t=16548

Test the reservoirs too.

[phil200tdi]

Hey Guys

Looking at my logs in a little more detail I notice the PWM are eratic and hit the roof at around the time my power curve flattens out. Boost Leak?!

I have changed out my Diverter Valves and tightened all the Charge Pipe connections, Will do some logging later and see how the logs look by comparison...

[Imran@Evolve]

Hi guys

Was good to meet you all on Saturday.

Here are the dyno graphs in jpg format.

Ben 135i DCT



John 335i DCT



Mark 335i MT



Mike 335d



Phil 335i



Raj 325i



Sam 335i



Wafik E93 M3



And here is a 125i we tuned with just Evolve SW after most of you left. This remap is available to 325i owners with the 3.0 engine.

[Sparky68]

Map 4 leak is still present obviously, will have a look at replacing the vac lines this weekend then move on to the next bit if that does not solve it.

[E93learner]

Hi all,

was good to meet up on SAturday, thanks to Evolve for putting up with us. And supplying nice tea/coffee biscuits & crisps

The 325i map looks very good. Imran when will it be released, also could you squeeze more power out of it

hopign next time i dont have the lowest out put of the day

Thanks

[Imran@Evolve]

Originally Posted by E93learner

Hi all,

was good to meet up on SAturday, thanks to Evolve for putting up with us. And supplying nice tea/coffee biscuits & crisps

The 325i map looks very good. Imran when will it be released, also could you squeeze more power out of it

hopign next time i dont have the lowest out put of the day

Thanks

That car was running 95 octane. More is possible with Super Unleaded.

It is available now!

[JNW1]

Originally Posted by Vtec Abuser

Just has DMS software pal..

Get the impression 350 to 360bhp is about right for a remap on the N55 engine. However, out of interest what was the peak torque figure? Looking at the graph it appears to be pushing almost 400 lb/ft which is pretty impressive for an N55; mind, could just be that my eyes are a bit dodgy..!

[Sparky68]

Originally Posted by phil200tdi

Just buy about 5 metres of silicon vacuum hose and cut to size, the BMW items are silly money for the same thing.

Buy a vacuum gauge like this:
http://www.amazon.co.uk/Draper-59075...3325803&sr=8-3


Follow the BMS DIY to test them:
http://www.n54tech.com/forums/showthread.php?t=16548

Test the reservoirs too.

Thanks for that Phil, what size is the vac tubing? Will see if we have any at work.

[fastloop]

Originally Posted by Sparky68

Can you take a quick look at this and tell me which ones i need to look at/replace ?
http://www.realoem.com/bmw/showparts...75&hg=11&fg=45

thanks

For the lines across the engine you need:
05 Vacuum pipe 1 13717558227 £9.42+VAT
06 Vacuum pipe 1 11657565963 £16.12+VAT

So for £30.65 incl. VAT I wouldn't take any risk by replacing these with silicon hoses. This area get some serious heat from the engine and most of these pipes are hardened plastic with sleeved rubber vacuum hoses. On higher mileage cars these may become frail, but before replacing any then do some pressure tests using a vacuum gauge.

The vacuum hose from top of canisters to solenoids are:
07 VACUUM HOSE BLACK 3,5x1,8 11727545323 £8.48+VAT a meter
These are less likely to have gone unless the ends have been damaged.

If you are going to replace the pressure converters then these are:
04 PRESSURE CONVERTER 2x 11747626350 £70.37+VAT (each and you need 2)

The other hoses to the turbo actuators are #8 (sleeved vacuum hoses), but they will be a right pain to replace. Phil managed to do the front one, but couldn't replace the rear one. So before you go this far do some checks as per Terry's guide.

Originally Posted by phil200tdi

Just buy about 5 metres of silicon vacuum hose and cut to size, the BMW items are silly money for the same thing.

Buy a vacuum gauge like this:
http://www.amazon.co.uk/Draper-59075...3325803&sr=8-3


Follow the BMS DIY to test them:
http://www.n54tech.com/forums/showthread.php?t=16548

Test the reservoirs too.

Phil, how accurate is that gauge?

Sparky68, see my post here for how quick my vacuum where bleeding off when I tested this.
http://www.e90post.com/forums/showpo...42&postcount=6

[Sparky68]

A guy in Luton will do a smoke test on it for £45 which i think might be both easier and quicker. Plus, me being useless with a spanner i would end up with loads of bits left over

[fastloop]

Originally Posted by Sparky68

Map 4 leak is still present obviously, will have a look at replacing the vac lines this weekend then move on to the next bit if that does not solve it.

Wow, it's barely able to make 6 PSI. It would be interesting to see how a stock map log look?

Originally Posted by phil200tdi

Hey Guys

Looking at my logs in a little more detail I notice the PWM are eratic and hit the roof at around the time my power curve flattens out. Boost Leak?!

I have changed out my Diverter Valves and tightened all the Charge Pipe connections, Will do some logging later and see how the logs look by comparison...

The left scale doesn't go high enough. At the top how high does the PWM go? With your mods and 15-16 PSI boost your car should be somewhere in the 420-430BHP area. AFAIK increments of 1 PSI is roughly about 10BHP.

The RR graph shows that the run was done in 4th gear (normal), but I seem to remember that you said 4th produced 419. Did you mean 3rd? Pretty sure all my dyno's have been done in 4th.

Originally Posted by Sparky68

A guy in Luton will do a smoke test on it for £45 which i think might be both easier and quicker. Plus, me being useless with a spanner i would end up with loads of bits left over

Pretty good price if they can do the smoke test with 10 PSI pressure. It takes time to hook this up so easy an hours labour.
See comment about weakest joint in step 1a, so you don't think this is the leak.
http://www.n54tech.com/forums/showthread.php?t=13114

[Tak1986]

Just resized some photos and here are the few taken during the day.

[Vtec Abuser]

Originally Posted by JNW1

Get the impression 350 to 360bhp is about right for a remap on the N55 engine. However, out of interest what was the peak torque figure? Looking at the graph it appears to be pushing almost 400 lb/ft which is pretty impressive for an N55; mind, could just be that my eyes are a bit dodgy..!

Yes mate just under 400lb/ft, so you're eyes haven't given up on you just yet.. It has made 390+ on 3 different dynos, so pretty consistant.

Mine is around 15bhp down on Boz's N54 DCT, but he does have DCI and BMWP exhaust over mine. What they give in gains isn't a great deal though I wouldn't think, so still fairly close.

[Vtec Abuser]

Originally Posted by Tak1986

Just resized some photos and here are the few taken during the day.

Pic of every car on the rollers bar mine.. Sack the photographer I say..

[Sparky68]

Map 4 is basically a stock map with CAN active which is why its where it is, only starts to crap itself once psi gets to 7 or 8+ .

Yeh he said it takes about 2 hours to do [uses baby oil or something he said]

[Vtec Abuser]

Originally Posted by Imran@Evolve

Hi guys

Was good to meet you all on Saturday.

Here are the dyno graphs in jpg format.

Ben 135i DCT

Thanks for these Imran Did you get my PM mate? Have you got the ATW figures at all?