135i build thread. I'm done hobcobbling posts together

[i_love_cars]

installed kW street comfort coilovers this weekend and just had Big Bear Tire do the adjustments today. H&R springs were a cheap way to prove whether or not I could get in my driveway if I lowered my car, but I definitely think I waited too long to get these coilovers. The ride height is so much more even now between front and back. Before the front was sagging over the tire and the back was 1.5" above the tire. Not to mention having springs that are matched properly to the damper in a proper coilover setup has dramatically improved ride quality. 

[patsbimmer1]

Looks good man!

[bk335]

Looking good. 

I had my car aligned at big bear last fall and whatever they adjust in the steering has been squeaking ever since.  It gets worse when the temp gets colder so I'm really stumped what squeaks.

[i_love_cars]

interesting, I actually have a bit of a creaking noise when i turn the wheel at low speed/stopped as well, but it started about 2 weeks after having the car back together from the turbo install. I haven't been able to definitively figure it out either. I"ve re-torqued everything but it sounds like the steering boots are pulling. 

shoulda taken it back to them. They do a lot of track setups for people I know and I've had all 4 of my cars there and never any issues. Jason is usually really good. Our goal should be to get our steering problem fixed before the next WIBimmers meet, otherwise Snap will just have more ammunition to make fun of us with as he lashes out at others who have functioning cars because he refuses to man up and buy a 335.

[B C]

[patsbimmer1]

bk335 said:

Looking good. 

I had my car aligned at big bear last fall and whatever they adjust in the steering has been squeaking ever since.  It gets worse when the temp gets colder so I'm really stumped what squeaks.

All they do is turn the inner tie rod... unless the boot got jammed up it shouldn't make any noise, although if that happens it usually doesn't make noise and/or the boot will correct itself.  If it's only when turning the wheel it's likely a lower balljoint or upper strut mount.

[i_love_cars]

ran a data log with 19 psi targets from 3k to 7k last night. Some adjustment is in order to keep the boost target a little tighter and on track but it's starting to come together. Holding 18.6 when I let off throttle at 6750 rpm feels pretty good. Hopefully in the next week or two I will be in a spot to get on the dyno

[bk335]

patsbimmer1 said:

bk335 said:

Looking good. 

I had my car aligned at big bear last fall and whatever they adjust in the steering has been squeaking ever since.  It gets worse when the temp gets colder so I'm really stumped what squeaks.

All they do is turn the inner tie rod... unless the boot got jammed up it shouldn't make any noise, although if that happens it usually doesn't make noise and/or the boot will correct itself.  If it's only when turning the wheel it's likely a lower balljoint or upper strut mount.  

That's exactly what I thought. I took the tie rods off a while back and greased the outer ball joints but that didn't help at all. It sounds like it's more where the rack and pinion meet.

[i_love_cars]

Got some early dyno results here that I'm pretty happy with but my car clearly has issues. Went to LMT this morning and put down roughly 420/470 with a boatload of timing problems. You can see the horespower just flatlines at 5k when it should just keep going up higher and higher to redline.  The torque and hp lines start to drop at the exact same point when timing starts getting pulled. There is a nasty drop at 5400 as well. Data logs have continued to show cylinder 1 as the primary culprit.

So my plan is this:  figure out if I have a bad coil or injector on Cylinder 1, then get these new colder N20 plugs installed and working properly. Currently running a stock heat range plug and some of you know I tried the N20 plugs as recommended by Dzenno and PTF and I had some issues. I'm going to revisit that because they are a colder heat range and many other N55s are reporting success with them. Today I am going to swap coils between cylinders 1 and 2 to see if my timing issue shifts over to cylinder 2. 

Hopefully this will inform me enough to fix the car and resume tuning because at this point all I have is a cobb flash and a JB4 with high boost targets. No adjustments have been dialed in yet for AFR or timing bias in my jb4 map.

#exhaustFlames

http://vid1170.photobucket.com/albums/r526/wardjt1983/IMG_0127_zpsuzatlhtm.mp4

[suspenceful]

Nice! Not bad numbers for an N55. Fix those timing corrections and you'll be much happier.

Also, sweet flames breh.

[i_love_cars]

I swapped ignition coils yesterday and no change. Cylinder 1 still giving wonky timing. 

Going to pull the plug and check the gap next I guess.

[patsbimmer1]

Did the n55 have injector issues?

[Earl]

Couldn't you have simply pulled a plug and checked it there instead of running back and forth to the dyno?

[i_love_cars]

Earl said:

Couldn't you have simply pulled a plug and checked it there instead of running back and forth to the dyno?

probably. it only takes a minute to swap them but I was at the dyno more to just get a base run of where I am currently at. Not really trying to solve world problems there. LMT had $50 pulls for the month of May which is a pretty good deal so I figured why the hell not.

[i_love_cars]

patsbimmer1 said:

Did the n55 have injector issues?

not as widespread as N54 but it does happen.

[suspenceful]

Which backend flash are you running? E85?

I know my E85 backend flash drops all cylinder timing to 9-10° right when I hit full boost. From there, it tapers up to 12-13° advanced. Looks to me like all of your cylinders (except #1) aren't advancing timing.

[i_love_cars]

agreed, there should be way more timing advance up top - what I don't know is just exactly what is throwing everything off. I am not ruling out the tune at this point either - I have a custom E85 BEF but I emailed Terry again about getting 98F0B posted. He never wrote a bef for that version of the n55 DME, which is frustrating. I sent him some data logs of what i currently have pleading with him because we talked 1.5 months ago and he said he'd write it but never did. 

I would really like to have that in my pocket to upload and test with to see if it is just a tuning issue on the back end. Hopefully he responds today.

[i_love_cars]

Here we fucking go. Terry got back to me today with a BEF for my DME version and VOILA. Car is running MUCH smoother and these logs are totally stable now with the proper ignition advance. Not a single thing wrong with any of the hardware on my car. Everything was tuning-related.

[i_love_cars]

Ok people, I went back to the dyno today after the tuning adjustments. Now the car is running where I thought it should've been to begin with. Very happy and I finally feel like I can call this car "done" in my eyes. I know some people are pushing the N55 further but in my opinion that's a $$$ rabbit hole that just isn't worth going down. At some point I'm going to sell this car and move into V8 territory.

475 whp / 477 wtq on E50 was my best pull today. The power band looks fantastic and I really couldn't be happier, especially knowing that I put all the parts on the car together myself and shit isn't blowing up. 

First 2 pulls were back at 21 psi same as what I had last week when I was making 420. When those looked clean I upped the targets to 23 psi in the midrange. Pull 3 had intake temps of 120 degrees so I had their dyno tech spray the engine down a bit before the 4th pull and picked up an extra 9 hp / 8 tq on the 4th pull.  23 psi in the midrange gave a really nice power increase between 4k and 5500 as you can see. 

[suspenceful]

That torque after turning up the boost!

I hope you're not still running lean. I saw your post on N54tech and looked at your logs.