SleeperZ

Rock on!

That's nice. My '78 is 2600, without heavy wheels, cage or bumpers.

Hey, my shift knob may not be labeled as explicitly as yours, but I do remember upshifting into 5th near redline and noting my speed. In a Z, I do consider 135mph f@#!ng fast!!

Hi Brandon, I was wondering if that was you. I looked at your "boost" post and thought it must be. I don't know of anyone but Ryan running a bug at 10.3@133. The reason your 18psi of boost isn't blowing piston chunks out the tailpipe is 1) the altitude, and 2) no intercooler, so the air mass isn't great enough to run you lean -- with a 750 Holley you've got plenty of fuel I would think. I will try to get to the strip to see you run in July. I get a vacation as the wife and kids will be out of town then. You are welcome to the slicks, I don't plan on using them. I think when you start hitting 1.8 and lower 60 foot times, axles will start snapping. You can also try running my drag radials as I am not running drags anymore and my tire stacks in the garage are hitting the ceiling. I'm glad you are having some success with that car now. Too bad the injection setup didn't work out. Don't worry too much about hurting stuff as long as you are running rich. Shane was running 22 psi boost on an injected setup, stock engine, for many seasons with no issues. Do consider running the highest octane fuel you can get and an alcohol injection would give you added detonation resistance.

For only 250hp, your running gear (n/a tranny and 3.90 rear) will do nicely. You don't need CV shafts either, even for 250 hp. I dyno 313 rwhp and still run stock half shafts with no breakage, even with drag radials and 1.8x 60 foot times. Good advice here: Stick with installing the stock engine and getting it running. Then focus on building more power -- a "BOV" comes later with higher boost and an intercooler.

Sounds like I got lucky with my conversion. I just bolted the mess up, and have no problems. It sounds like ThunderZ (local guy!) is taken care of now.

Ouch, I bet that stung!

I'm running the same exhaust with the Dynomax Ultraflow, and I agree, it's a mellow idle note, and the turbo spools before you even get on it. Nice job.

That's wicked...

Yep, that's where I got mine, same deal 2 years ago.

Tony, I'm sure he meant 5 bar boost.

All pistons are aluminum, or various alloys thereof. Forged are generally considered strongest, but factory turbo pistons are cast with stronger ring lands. If you've built a 3.1 with a normal or higher compression ratio (higher than 9:1), I would not consider any power adders with cast pistons.

Are you plumbing them one per bank, or common? Obviously you can run a single big external wastegate if the exhaust is joined before the turbos, otherwise you will need separate wastegates.

Depends on your plumbing arrangement, but typically twins are on opposite sides of the engine (VG33TT), so each turbo must have a wastegate.

I use the 3" Ultraflow and I love it. It is quieter than my original 2-1/2" chambered muffler, and the difference in flow is noticeable. A FAR better solution to a dynomax chambered muffler, I'll never go back.

I've been dragging with a T5, as several Colorado Z people, and we all agree it's a fine transmission. I much prefer it to the Nissan unit, which seems to break under duress more often. And you can't beat the aftermarket shifter support.

I run my diesel on regular old diesel oil and change it at 5000 miles. I send it in for analysis, and it reads good for soot concentraion, the additives are working, the viscosity is good. My opinion is you can run oil as long as it's good -- you can check this through regular oil analysis. Every vehicle is different; this 3000 mile thing is BS, and a waste.

I've been thinking about the same thing, although with a factory ECCS there would be some challenges if it's to run right on the street. The O2 sensor would not read properly. Another reason, other than detonation resistance, is ethanol or methanol can be derived from renewable and domestic sources. Since I'm running diesels on B100 biodiesel, running my gassers on ethanol or methanol has appeal.

When I had my P90 built with a turbo cam, my builder flowed 2 options: Stock and oversized valves. What he found, on a stock bore, stock exhaust valves with some relief flowed better than an oversize exhaust valve due to the shrouding of the cylinder wall. Oversize bore is undoubtedly better with a larger valve.

I've been away, and you've been at work. Nice job!