hfm 3.5 questions concerns

[LINUS]

Possible a few of the injectors are dirty & starving fuel, causing ping?

[ericzz]

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&sspagename=ADME%3AB%3AEOIBSAA%3AUS%3A11&viewitem=&item=140135093021

The injectors are new from turner . the car idles perfect response is awesome does not miss a beat . Passed emmisions with flying colors . Other than the ping I have not a one complaint . Above is the link to the "generic" HFM I bought notice he is no longer registered .Anyone else buy from him ?

[LINUS]

Can you verify the gas in the tank is quality?

I think you're getting off track on the HFM thing, since the 3" didn't cure it.

Have you dumped the gas & put in fresh Super from a known retailer? - also the easy cure might be the toluene as previously suggested - at least then you know it's a octane requirement thing, not a flawed sensor.

[ericzz]

The tank is fresh and I added 104 booster . it pinged prior to the current tank and with evey thing I have tried nothing has made a bit of difference . I am unsure why going from a 3.5 to a 3.0 with the same software there was no change in the car in performance or in the running . One would think with the software and the injectors I would have noticed something !I am only rueling things out at this point . On the 14th it goes on the dyno . I have a used motor that may have cams installed as well ?? Turner thinks the dyno will tell that with ease .

[Mike B.]

Like I said earlier, wait for the dyno results before you start throwing money at the problem (i.e. buying a new HFM).

There also has to be a procedure somewhere to troubleshoot an HFM. Don't assume it's bad just because it doesn't look exactly like the 3" and you got it at a good price.

[BeirBrennerE30]

Eric maybe you ought to take a short ride out to Bridgewater and borrow Beir's HFM and ECU to see if it's truely the issue or does someone else have the parts you need nearby?

I would be more than willing to help if you wanna take the trip. Where are you located in CT? Your best bet is to show whats it doing on the dyno before you throw money at anything. if the 3" to 3.5" doesnt show any difference than its probably not your hfm. Check your plugs to make sure one isnt fouled. If you can find someone with a code reader and check to see if its throwing something.

[ericzz]

Thanks again for the offer . I have a code reader and it has no codes stored .I want to rule out the HFM . Worst thing that can happen is I list one of the hfm's on EBAY and loose a few dollars no biggy . I find it hard to beleive a plug could be bad considering the car runs so well . One other thing is if I am at WOT it pings if i back OFF and ease into WOT it seems OK no ping really hard to pin down . Just FYI I own a repair shop in CT so I am no rookie . I was a BMW tech in a dealership for most of the E30 YEARS and a few of the e36 years .

[ericzz]

Ok boys and girls it seems that the installation of a 506 dme has cured the problem . I was told the hard coded fuel /timing maping from each dme is not the same . I also had a thought I have a bone stock very quiet exhaust and from what I have read most of you have performance mufflers . My point is if you have a 413 DME and similar modes to me give it a listen in the 6k range under load .

[matt]

You put the same chip in a 506 and it behaved differently?

[ericzz]

Yes 413 to 506 same turner chip .

[grib]

Thanks again for the offer . I have a code reader and it has no codes stored .I want to rule out the HFM . Worst thing that can happen is I list one of the hfm's on EBAY and loose a few dollars no biggy . I find it hard to beleive a plug could be bad considering the car runs so well . One other thing is if I am at WOT it pings if i back OFF and ease into WOT it seems OK no ping really hard to pin down . Just FYI I own a repair shop in CT so I am no rookie . I was a BMW tech in a dealership for most of the E30 YEARS and a few of the e36 years .

FWIW I believe I have the same 3.5" HFM off of eBay. I run on 91 octane (CA) and only get knock if I stomp on it at low RPM. I don't think it's your HFM.

My understanding is that the red label 413 and 506 ECUs are exactly the same. Turner told me this over the phone, and the fact that they are both running the same software version seems to confirm this.

If there is evidence of a difference between 413 and 506 ECUs, I think most of the people on this forum would be very curious about it.

[matt]

FWIW I believe I have the same 3.5" HFM off of eBay. I run on 91 octane (CA) and only get knock if I stomp on it at low RPM. I don't think it's your HFM.

My understanding is that the red label 413 and 506 ECUs are exactly the same. Turner told me this over the phone, and the fact that they are both running the same software version seems to confirm this.

If there is evidence of a difference between 413 and 506 ECUs, I think most of the people on this forum would be very curious about it.

The difference is that his 506 is not failing, I would guess.

[ericzz]

One would have to think that a unit that is the same & size shape plugs in and runs either car would share a part number if they were indentical . I was told that the base tune or mapping in the unit itself not the chip is different . I can not confirm this is true but it made a difference in my car .

[BeirBrennerE30]

the 506 is a different computer from any 413... turner even has a different chip for each one. The wrong chip will work in that computer but it will run worse. The 506 automatically richens up the mix and was the computer specifically designed for the s50US only by BMW M. Thats all i know about it but there may be other differences too

[matt]

the 506 is a different computer from any 413...

No, it isn't. 506 is a software version, not a DME hardware version. The 413 and the 506 are identical except for the software inside the chip.

turner even has a different chip for each one.

I'd bet money if you ask for a chip for the same motor with a 506 and a 413 you'd get the same chip.

The wrong chip will work in that computer but it will run worse. The 506 automatically richens up the mix and was the computer specifically designed for the s50US only by BMW M. Thats all i know about it but there may be other differences too

The 506 software was developed seperately to run on the same hardware as the older 413 software.

It's like Windows 2000 vs Windows 98. Same basic functionality, they work on the same hardware, but 2000 tends to work better.