JMortensen

Here is a partial list of what Larry has done for me and my friends who all grew up 510 and Z people: Rebuilt engines Rebuilt transmissions Diagnosed various electrical problems Installed limited slip carrier in a Z and my Toy truck Built a pie cut exhaust for truck Installed coilovers (cut spring plates and welded new perch on) Cut holes for GC camber plates Helped me make strut tower bars Changed out a timing chain on my Toy truck cam swaps rebuilt and tuned SUs rebuilt and tuned Mikunis and Webers valve adjust (can do an L6 in about 10 minutes flat, does them hot and gets it done before they cool enough to screw up the lash setting) converted a dual point distributor to single point by changing out the breaker plate brake upgrades rear wheel bearings installed Tilton pedal box I'm sure there is a lot more, but that's what I'm coming up with off the top of my head. Needless to say, he can do just about anything. When I moved out of CA about 17 years ago his welding wasn't very good and his fabrication skills weren't super high level either. I imagine he's improved a lot in that time though.

The scoop will eventually be sealed to an airbox on the underside of the hood. It isn't now, but that's the plan.

Just a little race recap/brag. Super happy with the way yesterday went down. I've had my 5.3 swapped Z out I think 5x, and every time I've had mechanical issues. Not yesterday. Well, I did have some driveshaft bolts loosen up, but I fixed it at the track. Went to Evergreen Speedway's autocross in Monroe, WA. This is a 5/8 mile asphalt oval with a smaller oval in the infield. They run it as kind of a roval with slaloms for autox. There are workers there, no cone shagging, and they limit events to about 90 to maximize runs. I ended up with 12 race runs and another 3 fun runs. Finish line is down the front straight, I was hitting about 90 mph. Mark and I worked on his car all day Saturday fixing a throttle cable issue and bracing his fender so that the tire didn't hit it, then raced all day Sunday. It was a full weekend. We wore Beta Motosports T-shirts in honor of JohnC and of course our cars have hoods and hatches from Beta, mine FG and Mark's CF. Still miss that guy a lot. About midday someone asked what my times were like. I had no idea, so they looked it up (phone app) and I was 5th overall. Then Mark got a rerun and I was able to ride with him and he went into the first turn 10 or 15 mph faster than I was. After using this data point to adjust my driving I ended up placing 2nd overall, and 2nd in class behind a supercharged, stripped S2000. Very happy. Mark was about 1.5 seconds behind, still in top 10. 9th actually. A very successful outing! Anyway, Mark is much better at sharing videos and pics and tagging appropriately than I am, so hopefully he will see this and post some more up, but here is my FB page where we have both posted a bunch: https://www.facebook.com/Jon.E.Mortensen And here is a link to one of my earlier runs. I did better later on, but I kept leaving my phone in my pocket and it was damn near impossible to get out, put the phone in the holder, get it all set up, and get back in the seat while in grid, so I didn't have any vids for the last half of the day. https://youtu.be/XmwkU3N8FB4

FWIW, I would prefer to have a stiffer pp and a normal style clutch than a puck clutch with a lighter pp. Seen flywheels gouged from puck clutches, a friend had the thrust bearing on the crank destroyed by a puck clutch in a CA18DET, etc. I ran an ACT stiff pp with a stock disk and that held down my L28/Mikuni combo just fine.

Sure. Relatively slow speed, say 30 or 35 mph. 4th gear with clutch in and floor it. When the engine gets up to ~5000 rpm, dump the clutch. The rpms should immediately fall to 1500 or whatever it would be at that speed. If it comes down slowly, your clutch is slipping.

I think he'd know if the timing chain jumped.

Not really getting how the clutch slipping is making the accelerator stick, unless it's slipping and you're just flooring it. That wouldn't be the best way to handle a slipping clutch though... Sounds like maybe the clutch can't hold the power down. The test for a clutch is to go about 35 mph or so, rev the engine to 5K rpm, put the trans in 4th and drop the clutch. If the engine doesn't immediately slow down, then the clutch is slipping and can't hold the power you have. When a clutch is marginal you'll also feel it on redline shifts in the higher gears. The rpm will slowly drop to the actual speed of the engine in the next gear. As to the sticking throttle, I had an aftermarket carpet kit that caught the corner of the gas pedal a couple times. After a couple incidents I finally just removed the carpet on the driver's floor to fix. Usually carpets or floor mats. Do you have auxiliary return springs on the triples? Not a good idea to rely on the springs on the carbs. Most (all?) racing orgs will require two additional springs on the linkage. Pretty easy to fab it up too.

It's been 20 years so my info may be out of date, but my machinist who did my E31 picked Schneider springs because they had much lower seat pressures than the competition, which I think was Erson and ISKY.

It's still worth doing the pedal depressor. If you just let the fluid drain out you'll have to get air out of a lot more places. Masters will run dry, etc. Much easier to bleed if you limit the amount of fluid loss.

You are correct about the soft lines being attached to the strut housings, I wouldn't grind them off, just disconnect and replace if they're old. Pedal depressor works. Done it many times. Can just cut a stick to fit between the seat and pedal with the pedal depressed a bit. Will squirt a tiny bit when you crack the lines initially.

Sounds like you needed a booster anyway.

Interesting to see this one pop back up. I figured out what was going on with the rough running. Wasn't wires or plugs; it was faulty battery disconnect switch and alternator charging. Basically the alternator was charging intermittently and on the dyno day it wasn't working, and the voltage got low enough to cause the ignition to start to fail. Went to an autox after this, ran great. Then went to another and it ran horrible and I saw a tiny wisp of smoke out of the battery disconnect. Swapped out the switch and wired it differently and then it still wasn't charging correctly. Cut the old switch open, the contacts were bent and it was BARELY making a connection. Was looking around for loose connections and turned out the dash idiot light in the charging system was intermittent as well. Moved the bulb around in the housing and suddenly had 14V on the gauge. Point is that the rough running was something entirely unrelated to carb or spark plugs/wires. 2nd lithium battery was killed in the process of figuring all this out. New LED light installed, new switch, new battery coming. Should be back in action very soon. From what I understand it should be making somewhere in the neighborhood of 370ish whp when running right.

Sounds like reaction disk issue. I saw you said you had checked it, but that's what I'm seeing looking at your post.

Oh, nevermind. I thought the issue was with the ITBs getting in the way of the booster. Was thinking L6, not V6. My bad.

Still need space for the booster though. I think GM's Hydroboost solution would work, not sure, but I keep coming back to wondering why you don't just tweak the manual brakes? Smaller masters will give a lighter pedal, larger will give a stiffer pedal that needs more pressure. It's not that hard to get it right. Here's a youtube video on replacing a broken Hydroboost setup:

I would suggest you don't go mild on the cam. People tend to undercam L series. I had a .490/280 cam which I ran on a stock compression L28 with SU's and it was great. When I moved up to triple 44s I felt like I needed more cam. Then I went to a higher compression shortblock and I REALLY needed a bigger cam (wouldn't run on pump gas). Never got around to it and went V8 instead, but I was looking for something in the 300 to 310 duration range.

LOL at I5 comment. I had a 99 Miata with factory Bilsteins. They overvalved the shocks, so that they packed down and you'd end up on the bumpstops, jackhammering your spine for a good 30 miles or so between Tacoma and Seattle, which is IMO worse than the part north of Seattle. Absolutely painful.

If you just delete the booster and go to the appropriately sized (smaller) manual master you should be able to get decent brake feel. If you drove my car and I didn't tell you the brakes were manual I doubt you'd say anything about the pedal feel at all.

Couple points: the smaller master usually goes on the front since a smaller master will give higher pressure, and you generally need that in the front where most of the braking is done. Might make sense if you have gigantic front brakes and tiny rear brakes though. The stock master is 7/8, so by going larger you're making it even harder than just getting rid of the power assist. About a month ago I ran across a guy on FB who was saying how dangerous manual brakes were, because his friend had installed larger than stock masters and then couldn't stop and rear-ended another car. Simple answer: he did it wrong by going with larger masters. Just be careful when you get it together and take that first drive, and be aware that there is a good likelihood you'll need to swap them around or go smaller.

Farrell's Automotive in Atascadero. (805) 466-1004 Larry and I kinda fell out and don't get along that well. Still, he is 10x the mechanic I'll ever be.

Adjusting camber with plates is pretty easy to DIY too. I'm guessing your wheel is off center after replacing tie rods, they can fix that for you too, but it should be a quick and easy alignment for the tech doing it.

Do you have any adjustable suspension parts? Control arms, camber plates, camber bushings, etc? Stock you can shim a tiny amount of caster in the front and set toe, and that's it. You can do that yourself, not even worth taking it to an alignment shop, unless you just want to see how bad it is.

You could try to track down my ex-roommate Larry Butler. 510 guy, was Nissan master tech, worked at a Z shop in SLO in the 90s. Lost touch with him, last I heard he lived in Atascadero, but I'm sure he's still turning wrenches and the guy knows old Datsuns backwards and forwards.

Yeah his Datsun project is basically putting his Enviate hill climb chassis under a very modded Z kinda sorta shape. It will be badass, and there won't be very much Datsun left.

Sounds like a badass swap to me. My understanding is 325 whp is pretty easy to do NA. If you start thinking that isn't enough power, turbo it and make ridiculous power. BeastieHatch has a J swapped Civic and it's putting down 600 to the front wheels (now has electric motors on the rears too). https://www.turnology.com/features/beastie-hatchback-the-v6-turbo-powered-civic-to-end-all-civics/