[bmwMcrzy]

Does anyone know if a dinan S2 is suppose to hit 170 @ WOT?

 

[TMcNasty]

Test your thermostat also.

 

[CSBM5]

Does anyone know if a dinan S2 is suppose to hit 170 @ WOT?

Yeah, that's the range S2 owners have reported in the past.

 

[bmwMcrzy]

Yeah, that's the range S2 owners have reported in the past.

Thanks, I get only 140 :sad2:

 

[CSBM5]

Thanks, I get only 140 :sad2:

Look into it. rneedham1979 (banned now for a few years) found the source of his S2's weak numbers (in the 140s) by changing his fuel filter. That one change popped the result to 170 range. FWIW, my stock M5 (well Dinan exhaust but that is irrelevant) has been turning out 143-145 this weekend, uncorrected, at 64F and 400ft elevation.

 

[bmwMcrzy]

Look into it. rneedham1979 (banned now for a few years) found the source of his S2's weak numbers (in the 140s) by changing his fuel filter. That one change popped the result to 170 range. FWIW, my stock M5 (well Dinan exhaust but that is irrelevant) has been turning out 143-145 this weekend, uncorrected, at 64F and 400ft elevation.

I was going to test the MAFs via Direct Voltage method to be 100% sure.
I might get a evolve alpha-N tune later this year.
The BEAST pulls hard so it's not a priority at the moment.

 

[OsinO]

Just adding my two cents here. I bought my M5 with 140k on the clock. As part of my regular maintenance I replaced the fuel filter and the spark plugs. I didn't feel any difference with the fuel filter but I did notice a difference with the plugs (much smoother pull, not more power per say).

 

[Racedriver777]

Hello Experts hehe

i just got my car out of vinterstorage , just a few days after i put it away i read about this MAF test stuff , and ive been biting my lips for 5 months to test this out

my car has a complete supersprint exhaust on,and its reading 139 at WOT 3rd gear , i saw 139 myself , but my buddy NeXT to me said just before it hit limiter it was at 143 , should this be higher with the supersprint exhaust ? i see a dinan S2 should be 170 , im not quite sure what a dinan s2 is im afraid , embaresing i guess , but this car is fairly new to me

thanks for ansver in advance

 

[Jimbotsi]

Hello Experts hehe

i just got my car out of vinterstorage , just a few days after i put it away i read about this MAF test stuff , and ive been biting my lips for 5 months to test this out

my car has a complete supersprint exhaust on,and its reading 139 at WOT 3rd gear , i saw 139 myself , but my buddy NeXT to me said just before it hit limiter it was at 143 , should this be higher with the supersprint exhaust ? i see a dinan S2 should be 170 , im not quite sure what a dinan s2 is im afraid , embaresing i guess , but this car is fairly new to me

thanks for ansver in advance

http://www.caranddriver.com/reviews/dinan-s2-m5-specialty-file
Dinan is a man that owns/ owned a BMW specialty shop in the USA. S2 is a performance package they designed for the car. I'm not the dinan expert but a catback exhaust shouldn't effect the MAF reading -- so it looks like your car is running quite well irregardless.

 

[Racedriver777]

Thanks very much for the answer she feels healthy :tonquesmilie:

However i do get that emissions light on the dash sometimes :-( can that be because of the upgraded exhaust? The readings just say too high emission. Then I go to bmw and get it switched off then it comes on again it did this morning that's now 3rd time in 15000 kilometres :-(

 

[paul88]

I have changed:

Tps's
Cps's 4 of them
Plugs
Mafs
Upper and lower coolant sensors
TS
Vanos seals and tested solenoids
Fuel filter
Fuel relay
Fuel pump
FPR (fuel pressure regulator)
Line that goes to FPR
O2 all of them

I'm hitting about 100 L/H on the test.

The car sometimes pulls hard and sometimes not, but I have never seen it over 110. Past week coil 8 went bad, so I replaced that.
When I start the car and the rpm drop to 900 or so the engine starts to wobble somewhat, once it wattles down to idle it goes away. I'm have reached the end of the road at this point.

Now just so you know, I drove with bad Tstat for a long time and I'm sure that caused rich conditions, could this cause the O2 sensors to go bad? Another thing I noticed is that there is hesitation when going WOT.

I did notice the car pulling very hard on few occasions just to go back to low power. This usually happens when I unplug the battery for a day or so. Any ideas? Would a leak from break booster caused such condition? Does the adaptation need a reset?

 

[technician117]

I have changed:

Tps's
Cps's 4 of them
Plugs
Mafs
Upper and lower coolant sensors
TS
Vanos seals and tested solenoids
Fuel filter
Fuel relay
Fuel pump
FPR (fuel pressure regulator)
Line that goes to FPR
O2 all of them

I'm hitting about 100 L/H on the test.

The car sometimes pulls hard and sometimes not, but I have never seen it over 110. Past week coil 8 went bad, so I replaced that.
When I start the car and the rpm drop to 900 or so the engine starts to wobble somewhat, once it wattles down to idle it goes away. I'm have reached the end of the road at this point.

Now just so you know, I drove with bad Tstat for a long time and I'm sure that caused rich conditions, could this cause the O2 sensors to go bad? Another thing I noticed is that there is hesitation when going WOT.

I did notice the car pulling very hard on few occasions just to go back to low power. This usually happens when I unplug the battery for a day or so. Any ideas? Would a leak from break booster caused such condition? Does the adaptation need a reset?

I think you just need to bite the bullet and replace more of the vac lines as suggested in your other thread. Maybe replacing the booster will help, maybe not. Has the booster ever sucked water because the drain in the body (of the car) was plugged? If so, you will want to replace the booster.

A lean condition will cause the car to rich the mixture over time (hence feeling of losing power) If you reset your adaptations and it runs better for a while then degrades, it's possible you have an air leak. If you have access to INPA for clearing adaptations, you can also monitor the long and short term fuel trims.

 

[///DeafM5]

I think you just need to bite the bullet and replace more of the vac lines as suggested in your other thread. Maybe replacing the booster will help, maybe not. Has the booster ever sucked water because the drain in the body (of the car) was plugged? If so, you will want to replace the booster.

A lean condition will cause the car to rich the mixture over time (hence feeling of losing power) If you reset your adaptations and it runs better for a while then degrades, it's possible you have an air leak. If you have access to INPA for clearing adaptations, you can also monitor the long and short term fuel trims.

How can you monitor long and short fuel trim? I have been looking for those trims and couldn't find on INPA? Maybe I am looking at wrong part of software?

 

[BMW_Harrastaja]

How can you monitor long and short fuel trim? I have been looking for those trims and couldn't find on INPA? Maybe I am looking at wrong part of software?

Read status and from there analog values 2.

 

[///DeafM5]

Read status and from there analog values 2.

Which bar or which term should I look for?

 

[bmwMcrzy]

I have changed:

Tps's
Cps's 4 of them
Plugs
Mafs
Upper and lower coolant sensors
TS
Vanos seals and tested solenoids
Fuel filter
Fuel relay
Fuel pump
FPR (fuel pressure regulator)
Line that goes to FPR
O2 all of them

I'm hitting about 100 L/H on the test.

The car sometimes pulls hard and sometimes not, but I have never seen it over 110. Past week coil 8 went bad, so I replaced that.
When I start the car and the rpm drop to 900 or so the engine starts to wobble somewhat, once it wattles down to idle it goes away. I'm have reached the end of the road at this point.

Now just so you know, I drove with bad Tstat for a long time and I'm sure that caused rich conditions, could this cause the O2 sensors to go bad? Another thing I noticed is that there is hesitation when going WOT.

I did notice the car pulling very hard on few occasions just to go back to low power. This usually happens when I unplug the battery for a day or so. Any ideas? Would a leak from break booster caused such condition? Does the adaptation need a reset?

Your car felt fine in November when I was your passenger.
Have you raced another stock M5 when it felt slow? 40 - 120 mph?
Have you ever dyno'd your car when it felt slow?

There has been a few days when my M5 felt slow but it wasn't enough to have me replace parts.
I don't know if the tires are simply gripping better that day.

 

[BMW_Harrastaja]

Which bar or which term should I look for?

"Adaptation additive" for short term and "adaptation multiplicative" for long term. I'm no expert with these so someone else please correct me, if i'm wrong.

 

[technician117]

"Adaptation additive" for short term and "adaptation multiplicative" for long term. I'm no expert with these so someone else please correct me, if i'm wrong.

I believe that is correct. What values you should expect? I can't help with that. 68FB has a depth of knowledge on the topic though. I suggest getting us some screen shots and maybe a video of the graphs in action.

P.S. - All of this nonsense could go away if you just bought a supercharger :dunno: cherrsagai :haha:

 

[Mini88]

Will this test be skewed if you are running Alpha N?

 

[paul88]

.