Smog-xperiment

Oy.

280z still didn’t pass. But got some useful data.

From the previous post, I installed a new catalytic converter, popped in new spark plugs, and re-filled an empty tank with 87 octane. Here are the old / new numbers:

CO% Levels   1st Try   2nd Try  
Speed MAX AVE MEAS MEAS
15 MPH 1.36 0.17 2.03 1.73
25 MPH 1.16 0.15 2.66  n/a

1st Try: Catalytic converter was supposedly original, but no numbers when inspected. Bosch Platinum Plus spark plugs had heavy carbon buildup. Ran 91 octane gas.

2nd Try: New Magnaflow catalytic converter, NGK spark plugs and 87 octane gas.

Thankfully Nguyen from Smog Tech did a quick CO% test just to see where we’re at. It ran steadily at 1.73% CO, just 0.37% more than MAX. Okay, time to adjust the 280z’s AFM (Air Flow Meter) to run a bit more lean air/fuel mixture.

3rd times a charm, right?… right?

New cat, ready to pounce (smog)!

Roar! yeah, you know it. Barreled into San Jose Mufflers (i like local) just off 24th street ready to meet Acardio.

I talked to Acardio a few days back looking for a catalytic converter to replace the non-CA legal one I have on now (read the beginning of the smog story). Hopefully with a fresh cat, we can tear up that smog test like cheese-less mouse it is (California, i love your shores, but not your government).

Over the phone, Acardio said he’d have it done in an hour and i could wait. He had that old street cat cut, dumped, and the new Magnaflow lion welded in like 10mins.. no really, more like 8.

He was so fast, I only got two pics shot before he said ‘take it ah waaaay’. Damn.. do you mind, um, could you just stand and pretend while i take some pictures for my blog?

Daily Datsun at San Jose Mufflers

GT40 bodykit on Fiero at San Jose Mufflers - Daily Datsun

nope, a Fiero with GT40 body kit

Daily Datsun at San Jose Mufflers

Took him longer to lift the thing than cut / weld a new cat on.

Daily Datsun at San Jose Mufflers

Daily Datsun at San Jose Mufflers

Daily Datsun at San Jose Mufflers

Wow, never seen the under side so well! It’s clear i need one of these lifts…

Daily Datsun at San Jose Mufflers

Daily Datsun at San Jose Mufflers

Shoot! got a call, and couldn’t get a pic of the welding! Oh well, regardless, i feel like…
Let’s go get that smog test.

Best spark plugs for a Datsun 280z

What ARE the best spark plugs for the Datsun 280z?

ClassicZCars forum, Haynes service manual, and many others swear by only one: NGK’s copper core spark plug.

During this smog-crisis I’m having, I did a switch up to help pass smog (more on that later), and after a bit of research,  sometimes the plain, simple and cheap solutions work best. This is certainly the case.

The best spark plugs I’ve experienced for a 280z are the NGK 7734 (BR5ES) or the  NGK 7634 (BR5ES-11).

Daily-Datsun-Sparkplugs (3)

 

But why? Why not platinum? iridium? Hell, if kryptonian-nuclear-nitrous-laced-ium spark plug was real and can wallup Superman, I’d think it would have been the best for that straight L6 engine, right? Nope. Save the precious metals for wedding rings. Platinum et al. may fire hotter, but you’ll notice right away that the contact point is much much smaller. Our 70’s era engines aren’t perfect, so there’s certainly going to be carbon build up over time – so less surface area, easier for carbon to build up and over.

Stats:

NGK BR5ES (7734) / BR5ES-11 (7634)
B – Thread Size / Hex Size: 14 mm / 13/16″ (20.8 mm)
R – Resistor
Heat Rating Numbers : 5
ES – Firing End Construction: Standard 3/4″ Thread Reach (2.5 mm) Center Electrode
11 – Spark GAP: 1.1 mm (.044″)

The Nissan / Datsun factory service manual says the spark gap should be between .039″ – .043″ (.028″ – .031″ for Canada). So though they’re somewhat pre-gapped at the factory, you should still buy a gap gauge to measure and adjust, checking for variability.

 

Here’s what the plugs looked like, taking them out of the 280z after 2 years…

Daily-Datsun-Sparkplugs (1)

Ooo not good. So I replaced each one, and let her rip.

Woohoo! More power, instantly. From the moment I pressed the throttle (and i’m usually kind of a turtle), I notice the difference right away!

I’ll definitely be monitoring the spark plugs more closely, and be adding it to a biennial or yearly maintenance routine since the NGK 7734 (BR5ES) or NGK 7634 (BR5ES-11) are cheap enough.

Now on to that cat…

Smog saga…

Sigh – “if it ain’t one thing, it’s another…”

Heard that before? We’ll let’s take this journey of the Smog Saga story together.

Last post was about having to get the Datsun 280z smogged because it’s a 1977 (and in CA, cars 1975 and prior are smog exempt!). Lo and behold the San Jose’s Smog Tech Test Only station was finally open. I was hoping Zac, the last technician who helped me out, would’ve been there, but I guess he’s gone. So, Nguyen (first name) help me out and put the Z on the machine.

Vvrrroom… vrroom.. [small chat].. i’m nervously looking at the digital gauge nearly falling out of the green passing zone. He pokes / prods.. gets under the car.

“You don’t have a legal cat”, he says.

Doh. Seriously. So i guess i know what a bagel and oj got me last time.

He mentions that CA gov passed a law recently about catalytic converters needing a special number. I quickly clamor, “But but mine’s a ’77 and they probably didn’t have numbers back then. I swear it’s all original!”. Nope, no go. Not only that, I failed out of CO spec on the actual smog test. Not by much, but still beyond the max % allowed:

CO% levels
15mph – MAX: 1.36; AVE: 0.17; MEAS: 2.03
25mph – MAX: 1.16; AVE: 0.15; MEAS: 2.66

*AVE = Average Emissions for Passing Vehicles

So as you can see, I’m just out of the range of passing 😦 Some google searching shows this is related to a few things, but probably due to running too rich (too much fuel in the mix). After a post on ClassicZCars.com forums, rcb280z pm’d me and we had a good chat about bringing those CO% levels down. His suggestion was to also check out the spark plugs for excess carbon (ah!). He swears by NGK, and lo-and-behold, most Z drivers do!

Time to get that 280z catalytic converter changed, new spark plugs, 87 gas, and head over to Smog Tech!

oh yeah.. if it ain’t one thing..it’s:

Daily-Datsun-broken-alternator-bracket
a broken alternator bracket (that’s why my car’s been squeaking!) and…

Daily-Datsun-cracked-EGR-tube
cracked EGR tube! oy…

i need a beer.

Smog time, sort of

It’s been two years and that “Stop!” DMV letter came in the mail – gotta get the 280z smogged!

Again, thanks CA for requiring cars 1976 and up to be smog certified. 🙂

Well so I’m back at Smog Tech Test Only (Nov ’11). Since we passed with flying colors (actually barely passing colors) thought I’d give them some repeat business…but looks like they don’t want me.

Their website says open on Sat 8am, yelp says 9am, guy next door says “usually comes in now (9:25am)… But it’s 9:30am (as of this sentence) and still no show.

Guess they didn’t want me.. Or the Stingray that also showed up. And left.

20130921-093315.jpg

20130921-093327.jpg

Interesting Part: Turbo Tom

I’m on my morning Datsun CL search routine. and come across something very interesting: a Turbo Tom.

CL-TurboTom-1

The Turbo Tom was an aftermarket turbo setup in the 70’s for the early Datsun L-series engines (think, a turbo before the 280zx). It was developed by SCCA racer Tom Wyatt III, which in his own right has a pretty inspiring Datsun racing story of his own. Supposedly as he raced his turbo’d L20b Datsun 510, they had to continue to move Wyatt up in class. He was blowing doors off each class all the way up to the Corvette and Cobras.. the big boys. And even then, he beat Porsches and Cobras by seconds*.

From what i gathered, the Turbo Tom was a BYOT (bring your own turbo) setup, coming with intake and exhaust manifolds, and featured a mount for a sweet 4 bbl carb.

ZCar-TurboTom-1

 

240Z car straight 6 with a Turbo Tom

Like any other aftermarket product, it’s subject to nay-sayers and the Turbo Tom is certainly no exception (one forum member harked it should stay dead). But also with pieces this interesting, there are those who create builds specifically around this turbo setup (zcar.com forum). Personally, I like the setup – it’s unique, it’ll no doubt give that L-series some more get-up-n-go, and it’ll be sure to generate talk with who ever sees it.

Worth $700? eeehhh sounds like a stretch, but I suppose for the right enthusiast, it’ll be turbo-riffic.

Original posting: http://sfbay.craigslist.org/eby/pts/4006283760.html

*DatsunHistory.com, http://www.datsunhistory.com/Racehistory1.html

4-speed or 5?

Ah yes! we’re talking transmissions today.

The Datsun 280z came with two manual transmission options in it’s lifetime: the 4-speed and the 5-speed (for which the car is also badged noting the upgrade). And after driving the 4-geared ’77 280z for nearly two years, I’m kinda at that point: I want more gears! :]

But wanting is often different from needing, and we just need to build a case to bridge the two. Call it, justification through research – let’s do it.

Here are the gear ratios for Datsun / Nissan transmissions at the time*:

’74-’78 280z 4-speed:
1st…. 3.321
2nd… 2.077
3rd…. 1.308
4th…. 1.000

’77-’78 280z and first year ’79 280zx 5 speed:
1st…. 3.321
2nd… 2.077
3rd…. 1.308
4th…. 1.000
5th…. 0.864 (13.6%)

’80 280zx 5 speed:
1st…. 3.062
2nd… 1.858
3rd…. 1.308
4th…. 1.000
5th…. 0.773 (22.7%)

’81-’83 280zx non turbo 5 speed:
1st…. 3.062
2nd… 1.858
3rd…. 1.308
4th…. 1.000
5th…. 0.745 (25.5%)

As you can see the ratio drastically changes in the ’80 280zx 5-speed when going from 1st to 2nd. Additionally, the ratio of the 5th gear gradually moves further from 4th’s 1.0 ratio as the years go on (differences noted by percentage changes).

With regards to the first difference mentioned, the change to 2nd gear really depends on driving style and fuel economy needs. A taller ratio in 2nd (closer to 1.000), will require more power, higher RPM, and thus more fuel. Gears 3 and 4 are ok because we’ll be moving quite a bit at those gears, but 2nd is tricky. Spend more time in first, or bang through gears?

For me, I actually spend a lot of time in 2nd. I usually take back roads for my commute, and time out traffic lights so i’m rolling into the green. So it’s natural to use 2nd to get the rolling 280z moving again (deeper than that, I’m terribly used to 2nd because i swear we used to have to start my brother’s 510 in 2nd gear – 1st was kind of wonky…though he says it was never that way hahaha).

So just by looking at the gearing, we can see with the early Datsun 5-speeds we’ll get better proportioned low-end, but not as tall on the top-end. Now that we’ve decided on a 5-speed…what are our 6-speed options? :]

Data specs from Ratsun post, DatzenMike, 09 July 2012.

PART III – WE MADE IT! – DailyDatsun’s Wedding 280z Complete

WE MADE IT – we did it! What started as a daily driver project, transformed into a serious restoration and finished as our wedding chariot. My fiancee and i tied the knot on Sunday, May 27th with a wedding nothing short of amazing. And getting this car completed on time was definitely a part of that weekend. 4 days and 10 people later, the 280z barreled it’s way over to our hotel and drove us to our wedding.

DailyDatsun 280z - Just Married

Truly starting the week before, I had already ordered the parts i had needed for the final assembly – window seals, weatherstripping, carpet, seat covers, and a front windshield (more on that later). I needed to those parts ordered quick to be ready as soon as the car came back. Once the car rolled out of the painters garage it was already Tuesday evening – literally only 4 days and 5 nights remaining. That night i got straight to it, sorting out the pieces getting it ready for a full attack the next day.  We quickly got into full swing with my brother Kris and a groomsman Erik helping hammer it’s way back to road-worthiness.

DailyDatsun 280z - instagram

We were able to complete the rear tail lights, some trim repaint, side marker lights, headlights, hood louvers, hood rubbers, floorboard prepping, and the front feet area of the carpet.

Thursday rolls around for another big day. During the afternoon I had the neighbors install the front and rear windows – truly a blessing to have a family who owns an auto glass repair company live next door to you! Late afternoon, brother brought over another groomsman Jerry and his girl Kennie (who had just both come over from Hong Kong) to lend a hand, helping clean windows and tackle the carpet. Carpet continued to dominate our time because of the measuring / cutting required for all the interior fittings: both sides of the seat belts, shifter, e-brake, and seat rail holes among other things. Carpet needs to go in first because it instantly transforms the visual impact of the car. Additionally, once that’s in, seats, center console, door trim, all that can go back in.

Later that evening, I had three more sets of hands arrive: my future sister-in-law Dana, my sister Kathryn and her boyfriend Jake! It was great, we all had our hands on this thing! Jake and Jerry tackled doors, Kennie and Dana helped clean parts, Kathryn helped me assemble the last seat, while Kris had the dreadful task of installing the rear driver-side interior quarter panel trim. Imagine having so many people who, for the majority, have never worked on cars (let alone re-assemble one) all help out at the same time – yes, it was a circus. Yes, you’ve gotta make sure all the correct bolts were used. But truly it was such a fun experience. I love working on projects with friends, more so with my brother and sister!

DailyDatsun 280z - Seat and sister

To top off the night, even LATER that evening, my parents flew into town, and they too dropped by to check out how things were going. I wish i got it on video / photo, but both my mom and dad would later return the next day to help out to complete the re-assemble.

Friday, My dad and i put in the seats, dash and door trims; while my mom cleaned parts, and even tackled the biggest task: clean / organized the storm of parts and trash that my garage was left in the previous night. Yes, I definitely should have gotten photos of my mom and dad helping out but we were just so focused on getting this done. Wipers went on, the last three pieces of chrome front windshield trim were found and installed. I got to say the whole project has been amazing, but there’s nothing like working on a car with your dad. More over, he’ll be driving it while we’re away on our honeymoon. It’ll be 40 years since he last drove a Z, and I can’t wait to hear what he’s got to say!

I had a two hour window to install the final touches late Saturday afternoon – front grill, front parking lights and their trim, horn, side-view mirrors, and of course, the c-pillar ‘Z’ markers. I took it off the battery tender attached the night before, and started him up. Perfect – solid and strong. Looks – amazing and fast. I’m proud and thankful that my friends and family helped get car back on the road, and ready in time for the wedding.

Sunday night we drove it back from the reception only to be stopped by a police officer 1/4 mile from our hotel. Doh. Were parts falling off? Lack of rear bumper? Nope. No tail lights. Brake lights were working but the car was “invisible out there” with no running tail lights. Luckily the officer was more concerned about our safety, and with the ‘Just Married’ sign and us still being in our wedding get-up we were let go with a congrats rather than a ticket. :] Sigh! now this rebuild story is complete!

Pictures of the re-assemble will come soon – for now here are some pics straight from the painter that Tuesday afternoon.

DailyDatsun 280z - fresh paint

DailyDatsun 280z - fresh paint 2

DailyDatsun 280z - fresh paint hood

DailyDatsun 280z - fresh paint 3

 

 

 

Got A/C?

Did an oil change on the 280z this weekend.
5 quarts of Mobil 10w30 and the car is purring.
This is a bit of an experiment because I’m using slightly thinner oil (i used 10w40 last time). Hopefully all the gaskets and seals will hold up, otherwise, it’ll help show where there needs to be re-done.

What’s missing from this picture?

280z AC belt - missing

While i was under car, i noticed a pulley without a belt… then another pulley… and another!
Hmmm i don’t know why i didn’t see that before – though i DID always wonder why the AC never got cold nor did i feel the engine power reduce a touch when turned on.

For those looking: Datsun 280z AC Cold Compressor takes a 11/16″ x 36.5″ belt.

280z AC belt - TR22358

I had to lower the adjustment pulley all the way down before i could get the belt on.
Tighten to a 1/2″ deflection, and we’re ready for summer! Now i wonder how cold the AC actually gets…

280z AC belt - installed

Got Issues? Nothing new…

Everyone’s been waiting for it – yes, the Datsun 280z has issues. But at almost 35 yrs old (come this April), who doesn’t? Isn’t that like 65+ in car years? :] Let’s go over a few…

1) Coolant Drooling – had to re-top off the coolant this weekend… there appears to be a small leak on top of the radiator. It slowly leaks, steams up against the hood, and there’s a small green pool forming on the top of the radiator. Appears to be coming from the cap itself (which would be a good problem to have). Interestingly enough, no matter how irregular the coolant is refilled, it always goes back to minimum.

2) Acceleration Hesitation – this has got to be priority #1.  Randomly, when the throttle is pushed down, the car hesitates as if it’s gasping for air, and RPMs drop. I’ve yet to figure this one out. Sometimes it happens on a cold morning, sometimes when warmed and humming down the freeway in 4th gear. It can happen when the fuel is low or when the fuel is full. It can happen when the 280z barrels out of a deep turn, or driving straight. Interestingly, it’s happened twice in the same spot on 101 flying by the 880N on ramp). Here’s what we’re looking at in terms of the priority cue:

  • Replace fuel filter ~$13
  • Clean gas tank ~$60 (muratic acid / chain / POR-15 method)
  • Air Flow Meter (AFM) ~$100 (after core exchange)
  • Replace fuel pump (previous owner replaced it already, i presume he had the same issue…)
  • Replace injectors ~$400
Now just so the readers aren’t worried, it’s NOT a frequent problem – but concerning none the less.
So i started with the cheapest option first: the fuel filter. Since I didn’t know when it was last replaced (replace every 24k miles), might has well start there.
new and old filters
Datsun 280z fuel filter
Two worm gear clamps, a tightening screw, and the replace was easy. Word of note, make sure you have a bucket to catch the fuel left in the filter (and dispose of it properly).
Datsun 280z new fuel filter installed
After the change, even though it’s been running well, I’ll always have to keep an eye on the issues.
Rained again lastnight… forgot about the leak in the windshield. If you do see a 280z rolling around, i’m the one with the orange bandanna in the corner soaking up the water hahaha