? about Valve Springs and Tuning

Elaborate on this for me. What is with the duration on those cams.

Originally Posted by Iceman00

Elaborate on this for me. What is with the duration on those cams.

Do the math with the #s I provided, you'll see....

where was I? good thread

Originally Posted by PEI330Ci

Do the math with the #s I provided, you'll see....

I see what appears to be a lot of duration. I'll try to decipher this, but it's not my strong point.

Originally Posted by PEI330Ci

Intake cam at idle
Open: 18.2944 deg after TDC
Close: 54.8870 deg after BDC
Cam lobe centerline versus TDC: +126 deg

Intake cam advanced
Open: 21.7056 deg before TDC
Close: 14.8870 deg after BDC
Cam lobe centerline versus TDC: +86 deg

TDC to BDC is 180 degrees

duration is a constant 216.5926* (@ .050)

That's really not much (at least what I'm used to).....weird.

Originally Posted by NightRunner

duration is a constant 216.5926* (@ .050)

That's really not much (at least what I'm used to).....weird.

How did you figure that one? There has to be something I'm missing here...

Originally Posted by NightRunner

duration is a constant 216.5926* (@ .050)

That's really not much (at least what I'm used to).....weird.

Bingo!!!

And this makes the power that BMWs make that much more impressive.

Originally Posted by Iceman00

How did you figure that one? There has to be something I'm missing here...

I find it helped me in the beginning to look at a "cam card" from one of the big name cam companies. This is one of the best websites I've found out there for easy to understand info on cams:

http://harveycrane.com/

Originally Posted by PEI330Ci

http://harveycrane.com/

Jesus! That's terrible but glad to see he is still around for us pups!

Originally Posted by PEI330Ci

Bingo!!!

And this makes the power that BMWs make that much more impressive.



I find it helped me in the beginning to look at a "cam card" from one of the big name cam companies. This is one of the best websites I've found out there for easy to understand info on cams:

http://harveycrane.com/

I've seen the cams cards before, crower would send them out with a set of cams to help you degree them.

Originally Posted by PEI330Ci

The TMS dyno plot.

I did 156 pulls on the dyno in 2009, all with 264/248 Schrick cams.

....and I've got all the cam specs anyone could want about those cams.

I look forward to reading about the testing with your car.

Just to update this thread since I never posted up my baseline dyno...

In this thread, http://forum.e46fanatics.com/showthread.php?t=735323, I posted my baseline and post-header dyno.



When I went to dyno after the headers I bought a new thumb drive and got my baseline dyno as well.

Subscribed.
Tune-wise you might want to talk to NickG - especially if you're going turbo down the road. His shop's in Pompano Beach - nickg@techniquetuning.com

Originally Posted by McSpeed

Subscribed.
Tune-wise you might want to talk to NickG - especially if you're going turbo down the road. His shop's in Pompano Beach - nickg@techniquetuning.com

Thanks! I will contact him in due time.

**********************************

Guys here's something new, next month I will be taking the plunge (for the better of E46Fanatics! jaja) and I will try to get an Apexi SAFC-II to work on my car.

I dont see why people here have not tried it before (I searched and no one seems to have used one, maybe because most are just scared to do some mild cutting into their DME harness, or that it does not work, but since no one has posted a thread mentioning it, I'll try it out).

My goal here is not to squeeze every possible HP from my engine with an AFC, after all, this will only take care of air/fuel tuning. But given how much richer my engine is running after the headers, Im sure I'll see a benefit from a/f tuning alone. On the richest spot which for my was 6000rpm, stock was at 12.92:1, with headers it was 12.05:1. There would be a few horses to be had there by just taking it up in the 13.1-13.3:1 range. I would have to sit on the dyno for some time to really see what a/f this engine likes best.

The dyno here shows the best baseline run Vs 2 of my headers dyno runs. I blew up the air/fuel box to get a closer look at the change...


This is of course wishful thinking; I still need to see if the AFC can work on my car. I do not see why it would not. AFCs are super easy to work, and require very little input. I know some folks on bimmerforums.com with M54s had problems getting it to work simply because they could not get a clean Throttle % signal, but on my M52TU it SHOULD not be a problem given that I have a cable-operated TB. Also people often have had problems getting piggybacks to work with the ignition system (and fuel system for the injectors); that would not be the case with an AFC because they tune by modifying the MAF signal before it reaches the DME, so as far as the DME is concerned, the AFC does not exist.

Anyways, here are my questions...

- Does anyone here have the M52TU DME's wiring diagram and pinout? I would need to identify a few cables to make it work... DME 12v Power, DME Ground, Throttle Position, MassAirFlow Signal... that's all I'd need
- Ebay has those Repair Manual CDs, are those worth the $10 or should I just dish out the $ for an actual Bentley CD? This way I can just get this information myself

Thank you guys in advance! Hopefully someone out there can steer me the right direction.

bump to the top :-p

SAFC's do add to ignition timing(not user controlled), be careful, and good luck.

Look into a B30 manifold, that will give you a good boost in power too.

Originally Posted by Iceman00

SAFC's do add to ignition timing(not user controlled), be careful, and good luck.

Yea I know, I just didnt want to get into a technical convo regarding that here when the majority of people here are scared of anything other than a plug-n-play tuning medium (like a SharkInjector lol). On my 3.5 swap I had actually upped to fuel pressure to a constant 55psi in order to do more correction via the AFC (I remember at 4500 I was already at about -27% IIRC). Running an OBD2 scanner program, I saw gains of ignition timing around that RPM of just about 5-6*. So yes Im aware of this indirect timing changes that can happen with tuning via MAF. . Im sure this engine could use some of it as well.

Originally Posted by Iceman00

Look into a B30 manifold, that will give you a good boost in power too.

One step at a time, but maybe around summer time I'll be doing this. Right now I need to upgrade my phone/plan, gym membership, and also starting to save up for tuition, as I'll be getting back into school this summer .

Do you happen to have a before and after dyno comparison of this swap on your car? Just wondering.

Thnx!

Originally Posted by 95blkmax

Yea I know, I just didnt want to get into a technical convo regarding that here when the majority of people here are scared of anything other than a plug-n-play tuning medium (like a SharkInjector lol). On my 3.5 swap I had actually upped to fuel pressure to a constant 55psi in order to do more correction via the AFC (I remember at 4500 I was already at about -27% IIRC). Running an OBD2 scanner program, I saw gains of ignition timing around that RPM of just about 5-6*. So yes Im aware of this indirect timing changes that can happen with tuning via MAF. . Im sure this engine could use some of it as well.



One step at a time, but maybe around summer time I'll be doing this. Right now I need to upgrade my phone/plan, gym membership, and also starting to save up for tuition, as I'll be getting back into school this summer .

Do you happen to have a before and after dyno comparison of this swap on your car? Just wondering.

Thnx!

Phones are overrated, you can get special gym membership rates if you go to the Y, and are a student. I understand school is important, because I'm a student too, awesome to see your priorities are in check.


No before and after dyno yet, but I'm working on that.