"Silver Demon v2" build

Discussion in 'Mazdaspeed 3 Build Diaries' started by VTMongoose, Jul 30, 2017.

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  1. VTMongoose

    VTMongoose John/MD1032 Platinum Member

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    Thanks for the advice about the straps...will do.

    I've largely learned to ignore the "normal" noises in my car at this point. My clunks come from the RMM personally....I also have buzzing sounds from things vibrating from the built motor, and a mysterious, really fuckin loud squeak that comes from the front driver's side area and seems to follow the motion of the shock at "intermediate" temperatures. Never have traced it. The shock actually broke at one point on that side and was replaced. Now different camber plates. Same sound. I believe it may be the springs rubbing against the spring adjusters. I did sand down (by that I mean angle grind) the springs at one point to make them fit some helper springs and spring dividers. It also could be my catch can which is in the same area and ghetto mounted to the frame. But when I wiggle it by hand (or anything on that side), I can't get anything to make the sound! And if the car is cold or hot, it goes away. Guess I should just alternate between driving like a grandma and an asshole. Oh wait, that's what I already do.

    Today was a bad day at the Evo school sadly. First off the car was pissing me off because it just doesn't have enough rear grip now and it's super tail happy. I checked my alignment sheet and there's -1.4 deg DS, -0.8 PS...that's not nearly enough to keep up with the front at this point, so hopefully I'll be able to take it back to the alignment shop next few days and get that addressed.

    The real kicker is, 2nd gear popout is a serious issue now. It was kind of a problem before, now, even with no shift weight, and no knob, it pops out under heavy braking in bumpy sections. Realistically, I know it's the trans, but it sucks because I know the synchro and fork pads are still good since the gear engages perfectly under all conditions. But @phate tells me on his trans, he had popout because the dog teeth were worn. I'll look into fitting a temporary solution (hairband or something to keep it in gear), but I'm probably going to have to end up replacing the whole 2nd gear set and synchros. That is going to suck...I have never attempted anything so technical before. Oh, and to top it off, I found the pivot shaft seal is also leaking. FML.

    At least the K04 and the XS Power seemed to hold up great. The car ran perfectly all day, barely knocked at all even on 93 with crazy BATs. Multiple instructors thought my car had an "insane" amount of power. I started tuning it on E85 on the way home after picking some up, and I am finding E35 isn't enough octane so far, so I will bump it up to E40 or so and hen post results after that. I'm also having trouble maintaining traction in 4th with E85, so getting a clean log is difficult.

    With E85, so far it seems 24 psi is available consistently at 2500 in 4th. ;)
     
    Last edited: Apr 14, 2018
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  2. ConeKiller

    ConeKiller Motorhead Greenie Member

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    So happy that people are using those vorshlag plates!

    Regarding 2nd gear popout, if you still have a shift weight and/or heavy shift knob, take it off.
     
  3. VTMongoose

    VTMongoose John/MD1032 Platinum Member

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    Thanks for the suggestion, but I already removed both and unfortunately it's still a problem even with no shift knob installed.

    I took the car to the alignment shop Monday before the dragon and had him put 2.5 degrees on both rears. He said the Megan Racing camber arms on the car are almost maxed, so I'll need some SPC's if I want more in the rear. When I took the car to the dragon, it was back to its old self, that is, understeering. I need more camber for sure, especially in the front. I killed my DS front's outside edge in about two dragon runs, after which things started getting greasy and cornering ability significantly reduced. Luckily I picked up a spare set of Nexens a few weeks ago at ~$400 shipped to my door so I'll have the alignment shop max out the camber in the front, then toss those on and re-evaluate my car's behavior. I'm getting to the point though with the car though where I only have minor complaints about the suspension. It's hard for me to imagine the steering response getting any better than it already is honestly.

    At phate's suggestion, I removed the ABS fuse and found it improved the braking a little bit. It feels about the same as not having ABS, with the exception that overdoing it on braking will lock up the fronts and turn off the engine, which interestingly was possible on my pu but wasn't possible on this car while I had the ABS enabled. But when I'm on the limit, there's a little more braking force available for sure, and the car also stopped doing this odd thing where it wanted to rotate slightly under braking.

    As far as reliability is concerned, nothing significant broke during the trip. The car ejected a couple more exhaust manifold bolts on the way down which was promptly fixed within a half hour with some 10x1.5 nuts and split-lock washers an advance auto parts somewhere in the middle of nowhere and those have stayed on.

    I am having a minor engine issue I need to look at that started at the end of the trip. Around 2500, north of 20 psi I intermittently get nasty spark blowout, and sometimes the CEL will flash indicating a severe misfire and throw a p0302 for a cylinder 2 misfire. If I ease into it, it's fine, and once it does it, it won't do it again for about another hour. I'll pull the spark plugs and check leakdown on all 4 and see what's going on. It's definitely possible I damaged something (or something was already damaged) because I was getting a shit-ton of KR at WOT at 2500 RPM's on the dragon, even on 50/50 E85, which seemed to be reduced by cutting VVT above 2.0 calculated load. Other than that everything seems fine. The car burned less oil than usual this trip to the dragon which was nice for a change of pace.

    upload_2018-4-22_21-4-16.png
     
  4. ConeKiller

    ConeKiller Motorhead Greenie Member

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    Bummer.

    I wouldn't recommend more than ~2 degrees of camber in a car that's daily driven, on either axle.
    There are other degrees of freedom for fore/aft balancing of a car which should probably be tuned before going maxxxx camber (e.g. springs, suspension bushings, bars, application of trail brakes).

    I pulled my juan's fuse a while ago, but at the same time, I also decreased the size of my front brakes (mz3 sport brakes). I'm sure it would be awful on the big track, but for braking in slippery/inclement conditions or for the purposes of applying brakes mid-corner to adjust pitch/balance of the car without the ABS freaking out, it seems better than stock.
    I would recommend leaving the fuse out and grabbing some mz5 caliper brackets and rotors on the cheap and seeing if you like it.
     
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  5. VTMongoose

    VTMongoose John/MD1032 Platinum Member

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    Agree 100%. To be clear, I'm adding camber because I want more grip, no other reason. The oversteer issue was caused by a large mismatch between front and rear camber and I thought it was interesting, hence why I wrote about it. But if I wanted to change the car's disposition towards over/understeer, there are better ways than with camber. According to my calculations, though, with the stock sway bars and these springs, the car should have roll stiffness distribution within a few % of its weight distro, so it should inherently be somewhere in the ballpark of neutral. My personal preference would be for it to stay on the understeer side because I'm a faster driver in an understeery car. But I'm not worried about that at the moment. I just want more grip.

    This car isn't daily driven and never has been. I had a 1994 Mustang GT as a daily which I sold last year and replaced with a 2011 Camry with a 6-speed manual that's been stellar for that purpose. I think I've only put 14k on the Mazda since buying it exactly one year ago.
     
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  6. VTMongoose

    VTMongoose John/MD1032 Platinum Member

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    Update time. Went to the dragon. Car decided it didn't want some of its exhaust manifold nuts (again) on the way down. Replaced at a random advance auto parts in the middle of nowhere. Everything finally seems to be holding as of now. I'm using a combination of all kinds of different stuff back there now, but neatness doesn't count if it works!

    At the dragon, I noticed my car was getting very greasy feeling on right handers, so I swapped the nearly dead DS front tire with the slightly fresher rear tire on that side. By the end of the trip, the "fresher" tire looked like this anyway, marking the first time I killed a set of tires' outer edges before the inner edges:

    [​IMG]

    So I got some new ones. Some random 2014 production Kumho 200TW autocross tires for $285 after MIR + $30 shipping. I'll bank the spare Nexen Sur4's I have in the shed for next season (if these survive).

    [​IMG]

    The last day I was at the dragon, I started getting some big KR at low RPM's (even on E48), and wicked spark blowout on cylinder #2, flashing CEL, whole 9 yards. Pulled the plugs when I got home and...oh my...

    [​IMG]
    [​IMG]

    I'm a little disappointed I killed a set of plugs in only 14k miles. I'm not sure what's to blame, other than me. I always hand tighten plugs (I've had bad experience with torquing in the past) but I'm careful not to overtighten. It could be a detonation issue, because I did autocross the car on 93, and tuning it on 93 really caused a ton of knock at low RPM's (logs looked nasty until I got it dialed in). At any rate, I had a new set of stock Gen2 plugs (SILTR6A-7G) sitting around, so I threw those in and torqued to 20 ft-lbs. I was still getting a touch of blowout during boost spikes (to 27-29 psi), so I pulled them again and regapped to about 0.024" (the factory gap is 0.028"). Problem solved.

    While I had the plugs pulled the first time, I rechecked engine leakdown at about 70 psi and got the following values rounded to the nearest 5: 0-10-10-0. #2 is the highest at 12%, explaining the oil residue on the plug. Oddly my engine has a new oil leak somewhere on the back of the block, yet consumption was lower than usual on my dragon trip (a little less than the usual 1 qt/1000 mi). I'm not sure what the deal is with 4 and how I have basically no leakdown now where before it measured about 10%. I'm thinking I didn't put the piston at TDC properly or something the first time.

    [​IMG]

    At any rate, the car feels stellar with the new tires and plugs. I was driving it on the street last night to get rid of the release compound on the tires (almost 180'd going into the first corner, whee!) and once I scrubbed them in, the car responded great to even really sharp inputs (the car was feeling super greasy before and my path through slaloms was looking more and more sinusoidal). Nothing notable about the Kumho's other than they have a noticeably lower slip angle than the Nexens. The car is super, super easy to drive at the moment and absolutely ready to perform in an autocross. Now I just have to get myself ready to do the same!
     
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  7. HawkeyeGeoff

    HawkeyeGeoff MSO Chicks Greenie Member

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    Bitchin' man. Keep driving the dick out of that thing...it's what it's for!!! <3
     
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  8. AYOUSTIN

    AYOUSTIN Silver Member

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    14k on a set of plugs for a car that's driven in an aggressive manor and not regularly doesn't sound out of the ordinary to me. I run cheapo copper NGK plugs in the evo, they usually last 3-4k miles before fouling but they're $2 a pop so I just keep a spare set on me every time I go to the track.

    Also, I'm surprised you were only able to get 5° of caster out of the car. I vaguely remember the newer gen 3 coming with like 8 or 9 degrees from the factory.
     
    Last edited: May 2, 2018
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