[justpete]

Originally Posted by TheAxiom

WOW, 1400?! Prices have really gone up, I think it was $800 back when we last looked (and there was a group buy for it, knocking the price down further) AT took their sweet time in making it, but I'm not sure about much beyond that.

I will say I haven't heard of any harmonic issues with the N52 like there was with the M54, but you'd want to check with the club racers on what the common wear areas are. Worst case scenario, you have to treat it like a consumable item.

I'm REALLY curious to see how the headers change the powerband, it's my next project.

Followup - I've gone ahead and ordered a new crankshaft for $1400 to make the necessary measurements for ATI. Assuming their engineering department approves the submission it'll take as long as twelve weeks and could cost as much as $1200. Reread the form, I was wrong about the amount before. I've attached the form for the heck of it.

[justpete]

Originally Posted by TheAxiom

Mine had the enforcer plates. I'm just not a fan of Poly anything, they chunk and break off from what I've seen.

These have the Enforcer cups installed as well. May have to rip and replace them regularly, wouldn't surprise me.

[Taskmaster]

I got sick to my stomach thinking of the money spent.
Honestly, I'm looking forward to seeing what works and how well - this is awesome!

[justpete]

Originally Posted by TheAxiom

I got sick to my stomach thinking of the money spent.
Honestly, I'm looking forward to seeing what works and how well - this is awesome!

Oh yeah, it ain't been cheap. At all. $1400 for a crank and $1200 for a damper is a freakin' drop in the bucket at this point I'm afraid.

Will have enough CAN channels to log a decent number of derived parameters as well, except for linear suspension pots and real time tire temp. Should be able to find out how well it runs once I get it to the track. Or not. I'm thinking the car will outdrive me for a good while...but then that's the point of all this really.

[justpete]

Stock and 3-stage dyno for reference. Finally found the original, and seriously lousy pics of the dyno plots. Sorry, best I got.

Stock with BMW PI and PE


With PI and PE and AA 3-stage manifold specific tune


These were run on the same tie-down back-to-back without adaptation other than during the pulls. Temp was mild, indoors, and data is uncorrected.

[Taskmaster]

Nice graphs!

[justpete]

Originally Posted by TheAxiom

Nice graphs!

Interesting how the three stage hp curve drops to the same point as the non-stage-three manifold number at 4500rpm but takes off from there.

After the diff was installed and broken in we ran it again with the AA tune specifically for headers and the curves are exactly the same just down a little since it's a different run a month later, different tie-down, etc. Not a big difference, within tolerance of error anyway.

They have a fresh drum of Sunoco 260 GT so if we can get the tank near empty we'll try it with some of that stuff and see if it makes any difference after running a baseline with the cat-delete tune on Shell 93. Doubt it'll be significant though but ya' never know.

[Taskmaster]

Originally Posted by justpete

Interesting how the three stage hp curve drops to the same point as the non-stage-three manifold number at 4500rpm but takes off from there.

After the diff was installed and broken in we ran it again with the AA tune specifically for headers and the curves are exactly the same just down a little since it's a different run a month later, different tie-down, etc. Not a big difference, within tolerance of error anyway.

They have a fresh drum of Sunoco 260 GT so if we can get the tank near empty we'll try it with some of that stuff and see if it makes any difference after running a baseline with the cat-delete tune on Shell 93. Doubt it'll be significant though but ya' never know.

Header tune and no headers will cause the car to run rich and lose power, so when you add the headers thps numbers should bump back up.

As for that dip, I was comparing it to the stock graph and it does make less power there than stock which is surprising. ST|G and Andry will probably rub it in my face that Evolve gained in that area hahaha!

[justpete]

Originally Posted by TheAxiom

Header tune and no headers will cause the car to run rich and lose power, so when you add the headers thps numbers should bump back up.

As for that dip, I was comparing it to the stock graph and it does make less power there than stock which is surprising.ST|G and Andry will probably rub it in my face that Evolve gained in that area hahaha!

Good point, I hadn't thought about it much but you're probably right. Been running like that since, I never went back and swapped the tunes.

The rpm point for the DISA motor actuation can't be moved in the MSV80 DME so an increase there would be something different with this DME. I did notice some adaptation over the several runs with the header tune and the hp did increase at 4500 but not a heckuva lot. I wonder if Evolve's figured out a way to shift DISA operating points.

Has anyone ever compared AA and Evolve tunes on a single dyno tie-down?

[Taskmaster]

Nope. But are you local to OE? They could probably do it. Who said the MSV80 can't control the DISA, the N51 engines come with the manifolds. Do you have a dyno and/or overlay of the header tune?

[justpete]

Originally Posted by TheAxiom

Nope. But are you local to OE? They could probably do it. Who said the MSV80 can't control the DISA, the N51 engines come with the manifolds. Do you have a dyno and/or overlay of the header tune?

OE? Evolve's tune is only $899 but it'd be a waste if it wasn't likely to provide any significant usable improvement.

It's not that it can't control it just that it can't shift the rpm actuation point like the msv70 could.

I have the dyno of the header tune but not sure where, just have the pdf of the images. I did compare it point by point and it's the same, just lower a bit like I said. I'll look for it and see if I can post it up too. Thanks for the help.

[justpete]

Heard the engine run today with open headers. Didn't make a recording 'cuz the mic in my phone can't capture that much awesome.

Vibration is negligible, at idle anyway. Barely there resting hand on open door. My G35's armrest vibrates nearly as much at idle with the door closed. OK, maybe not quite that much but it's nowhere near obtrusive afaic. Surprising but relieved it isn't worse.

Settled how to route the DASH3 cable to the console, where to mount the Safecraft fire suppression system bottle and the pull handle. And the location for the front struts' remote reservoirs is determined with them already mounted against the back of the bottom half of the cowling, the top piece is permanently removed now and Burger Tuning filters to be installed in openings. Very clean, very clever. Dang if everything new doesn't look like it was there coming from the factory.

[justpete]

HPA Ultimate Clutch Pedal install:

Original



HPA pedal



Interestingly there wasn't an overcenter spring installed from the factory so there was nothing to install to one of the three anchor positions on the pedal bracket. Maybe it wasn't installed in the 2011 model, dunno. It was built in the last month of production though, maybe they ran out of 'em.

Regardless, it feels a lot more solid than the plastic OE pedal.

[StealYourFace]

How do you like the 3.73 rear? I had 3.64s in mine until that rear end broke, and when they sent me a new one, I went with 3.38s as more of a compromise for highway driving. The 3.38s are still better than what it came with and make the car feel a lot more lively the 3.64s were really cool

[justpete]

Originally Posted by StealYourFace

How do you like the 3.73 rear? I had 3.64s in mine until that rear end broke, and when they sent me a new one, I went with 3.38s as more of a compromise for highway driving. The 3.38s are still better than what it came with and make the car feel a lot more lively the 3.64s were really cool

It just rocks, wouldn't give it up fer nuthin. Having a true six speed that produces ~15% more thrust at any given speed beats the stock gearing hands down. I don't make highway trips so the overdrive was completely pointless to begin with and I don't miss it at all. Runs about 3500rpm at 80mph I think.

It's a Performance Gearing diff and we think it's a street version, hard to say as the man who spec'ed it isn't with us any longer but I know it's a 2-way 70% lockup and it's unquestionably progressive but I don't know the ramp angles or static lockup. I'm guessing it's a street spec'ed diff at the upper end of the available lock range. I really need to ping them and see if I can find out more. So far it's just been completely indestructible and I say that not because the engine is a monster, cuz it ain't, but mainly cuz I just abuse it too much with fast marginally poorly timed shifts. I really hate synchromesh transmissions. And they know it...

Dang but that diff was expensive tho, maybe I should quit abusing it. Um, nah, that's half the fun. Right up till it's not. Maybe it'll give me an excuse to get it rebuilt as a street/track version. Highly highly recommended tho.

[justpete]

Forgot to mention the trans is now running Redline MTL, that's new. The diff has always run Redline with friction modifiers.

And the pedals are all from Ultimate Pedals. Mounted with milspec screws and jet nuts on the brake and clutch pedals, stainless Type AB thread cutting screws (I think) for the throttle and dead pedals.

All the chassis assembly has been done using Flexbar Rocksett ceramic adhesive threadlocker instead of Loctite, including the RE PRO wheel studs.

fwiw

[justpete]

Originally Posted by TheAxiom

WOW, 1400?! Prices have really gone up, I think it was $800 back when we last looked (and there was a group buy for it, knocking the price down further) AT took their sweet time in making it, but I'm not sure about much beyond that.

I will say I haven't heard of any harmonic issues with the N52 like there was with the M54, but you'd want to check with the club racers on what the common wear areas are. Worst case scenario, you have to treat it like a consumable item.

I'm REALLY curious to see how the headers change the powerband, it's my next project.

FWIW, after more careful study of the engine and the images of existing dampers at VAC it's clear the crankshaft dimension data for the custom damper form isn't needed. ATI should only need the hub dimensions for the pilot and bolt circle so they can make a bolt-on damper with the correct multi-groove pulley. At least we don't need a crankshaft now.

And the data at http://bmwfans.info/parts-catalog yields the weight of the crank by subtracting that of the bearing shells and adding that of the sprocket, hub, and bolt. Assuming the crank weight ATI is looking for would include the hub, etc.

Well, that was a whole lot easier...

[Taskmaster]

Originally Posted by justpete

FWIW, after more careful study of the engine and the images of existing dampers at VAC it's clear the crankshaft dimension data for the custom damper form isn't needed. ATI should only need the hub dimensions for the pilot and bolt circle so they can make a bolt-on damper with the correct multi-groove pulley. At least we don't need a crankshaft now.

And the data at http://bmwfans.info/parts-catalog yields the weight of the crank by subtracting that of the bearing shells and adding that of the sprocket, hub, and bolt. Assuming the crank weight ATI is looking for would include the hub, etc.

Well, that was a whole lot easier...

PLease tell me you cancelled the order on the crankshaft.

[justpete]

Originally Posted by TheAxiom

PLease tell me you cancelled the order on the crankshaft.

Oh yeah, last night. In a big hurry. I ain't the sharpest knife in the drawer I guess...but better late than never, huh?

[chris82]

Originally Posted by justpete

It just rocks, wouldn't give it up fer nuthin. Having a true six speed that produces ~15% more thrust at any given speed beats the stock gearing hands down. I don't make highway trips so the overdrive was completely pointless to begin with and I don't miss it at all. Runs about 3500rpm at 80mph I think.

Can you confirm this? I mean for that ratio, 3500rpm does not seem too high at 80mph. I think I could live with that on the street. I'd just have to wake up a little bit earlier for work because I'd definitely want to keep it under 3k haha

[justpete]

Originally Posted by Chrisar82

Can you confirm this? I mean for that ratio, 3500rpm does not seem too high at 80mph. I think I could live with that on the street. I'd just have to wake up a little bit earlier for work because I'd definitely want to keep it under 3k haha

Yeah, that's about right, taken from OBDII rpm and GPS speed. Been driving with it since last August.

[chris82]

Originally Posted by justpete

Yeah, that's about right, taken from OBDII rpm and GPS speed. Been driving with it since last August.

Can you get a video of it with some acceleration?