Ian's 99 post-TB screw re-rebuild. - Page 22 - Miata Turbo Forum -Boost cars, acquire cats.

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Old 10-23-2015, 05:07 PM   #421
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Your boosted cells are pretty similar to mine. Only real difference is after 6,500 I keep adding timing, you keep it flat from 6500 up. Why is that? Dyno said no more power? Or you don't rev that high?
I have stock cams, so there's no point in going over 7000, and my 96K mile, OEM valve springs aren't strong enough so the valves are floating around 6900 anyway. I should do something about that.

--Ian
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Old 10-23-2015, 06:34 PM   #422
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Gotcha, makes sense. I too had valve float with a turbo at higher RPMs with stock springs. So I guess the answer to why you don't run more timing at 7K vs 6.5 is that the valve springs are floating and you don't rev that high anyway?

I'm actually working on my setup to try and make more midrange so I don't have to rev it as high for reliability and stock cam happiness.
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Old 10-24-2015, 04:12 AM   #423
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I spent a while looking at compressor maps today -- got tired of picking points to compare them and decided to play with them in photoshop. I took the 6258 vs 2863 maps, rescaled them to the same size and overlaid:



The two compressors are pretty close to each other!

--Ian
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Old 10-24-2015, 11:50 PM   #424
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Washed the Audi, went out and shot some non-cell phone photos of it today, finally:







--Ian
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Ian's 99 post-TB screw re-rebuild.-0p7a4377-l.jpg   Ian's 99 post-TB screw re-rebuild.-0p7a4405-l.jpg   Ian's 99 post-TB screw re-rebuild.-0p7a3852-l.jpg  
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Old 11-12-2015, 04:08 AM   #425
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So I guess my Miata has been trying to pretend it's an FD -- blowing vacuum lines off all over the place. It never did it with the 2560, I guess the extra 8 or 9 psi of boost is enough to make the difference. Lost the MAP sensor line at the dyno before Laguna, lost a bunch of the wastegate lines *at* Laguna, and then blew off the the little right-angle line that connects the upper and lower halves of the VICS manifold at the dyno a few weeks ago. This evening I was prepping the car for Thunderhill and decided to go through and properly secure whatever hadn't been done yet and found that the line that feeds the VICS chamber was about 1/4 inch from blowing off. Had to pull the manifold apart to get to it, but I *think* I've got them all now.

Thunderhill 3 mile course on Friday!

--Ian
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Old 11-12-2015, 12:50 PM   #426
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Thunderhill 3 mile course on Friday!


PDC open event?
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Old 11-12-2015, 01:04 PM   #427
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So jealous.
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Old 11-12-2015, 03:34 PM   #428
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Argh, all loaded up and the truck threw a couple of glow plug codes. I hope it starts at 7AM tomorrow in Willows at 40 degrees...




--Ian
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Old 11-12-2015, 03:36 PM   #429
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Shoulda bought a cummins

This is why you should camp at the race track. Then you only have to worry about your car starting.
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Old 11-12-2015, 04:33 PM   #430
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So I guess my Miata has been trying to pretend it's an FD -- blowing vacuum lines off all over the place. It never did it with the 2560, I guess the extra 8 or 9 psi of boost is enough to make the difference. Lost the MAP sensor line at the dyno before Laguna, lost a bunch of the wastegate lines *at* Laguna, and then blew off the the little right-angle line that connects the upper and lower halves of the VICS manifold at the dyno a few weeks ago. This evening I was prepping the car for Thunderhill and decided to go through and properly secure whatever hadn't been done yet and found that the line that feeds the VICS chamber was about 1/4 inch from blowing off. Had to pull the manifold apart to get to it, but I *think* I've got them all now.

Thunderhill 3 mile course on Friday!

--Ian
Yeap! I run zip ties on every vacuum hose for this reason.

Good luck at the track! For the truck, if you are actually worried about it starting, grab a can of WD40. Worst case it won't crank, it will with a shot of WD40.
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Old 11-12-2015, 06:08 PM   #431
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He's been using zip ties and still blowin' lines. Last time we were at MRLS safety wire was the only thing that was holding up for him.
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Old 11-12-2015, 06:09 PM   #432
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Get some hose clamps.
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Old 11-12-2015, 06:11 PM   #433
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Retap everything in NPT and run compression fittings and 1/8" copper pipe.
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Old 11-12-2015, 06:12 PM   #434
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Man up and run AN lines.
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Old 11-12-2015, 06:19 PM   #435
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Replace all the vacuum things with linear actuators.
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Old 11-12-2015, 08:22 PM   #436
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He's been using zip ties and still blowin' lines. Last time we were at MRLS safety wire was the only thing that was holding up for him.
Odd. I've never had a vacuum line come off using a zip tie to secure it on my miata. And I've run as much boost as Ian.
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Old 11-12-2015, 08:23 PM   #437
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I bet heat has something to do with it. His wastegate line likes getting brittle and blowing off.
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Old 11-12-2015, 08:31 PM   #438
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I bet heat has something to do with it. His wastegate line likes getting brittle and blowing off.
I always ran 1/4" fuel line with hose clamps, and a fire sleeve over that. Lasted for years. External gate though, not sure what he runs.
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Old 11-13-2015, 02:12 AM   #439
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The heat from the turbo was destroying the zip ties on the wastegate, they got brown, lost all flexibility and started cracking. Safety wire was the right answer for those.

I think the MAP sensor I'd just forgotten to zip tie it, so it's zip tied now. Most of the vacuum lines on the car are just zip ties.

The ones in the guts of the VICS manifold are straight pipe with no barb on them, and zip ties don't have anything to grab onto, plus they're almost impossible to get tight due to lack of clearance. I used safety wire on those this morning.

There *is* one vacuum line left with no restraints on it, it's the one that connects to the VICS vacuum reservoir that's integral in the bottom half of the manifold. It's underneath the fuel rail, and seriously a PITA to get to, but it's also on the other side of a one-way check valve, so it should never see boost.

I am too old to camp at the race track. Hell, I was too old to camp at the race track when I was 25. I like the Baymont in Willows, much better than the Best Western because the rooms are actually quiet enough to sleep in without being woken up by trucks rumbling down the freeway.

--Ian
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Old 11-13-2015, 02:13 AM   #440
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Actually, now that I think about, I'm simultaneously both too old and not old enough to camp at the track. I'm too old to put up with a tent, but I'm not old enough to bring an RV.

--Ian
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