Turbo FZ Build

[05_RXP]

Man that sucks. However he did step up a little. Still don’t make it right. This how ever is the same reason I never let anyone ride my ski. I let a buddy take my ski for a ride. Wanted to show his gf around so o thought what could go wrong. Set out some basics guidelines to follow. Sure enough broke everyone. Came back f,d up 3500 in repairs. Down a month with out ski in prime season. Luckily he paid for all the damages.

[hotbutta]

What ring gap and piston to wall clearance did you put in the new engine? That motor should have taken those 20 pounds at 9300. Check end gaps for evidence of contact in the damaged engine.

[mittens]

The motor that was in it was the factory motor.

& I replaced with a factory OEM short block. Bolted new head that I built to it.

it held 9300 & 20 lbs fine... just not for 6 miles strait, on 95 degree day. I can look at the piston rings but I don't think it just failed cause lean or the boost looks to me like exhaust gas temps on back jig got too hot. I don't even know how he held on for that long that fast.. I do 10-15 seconds max.

[hotbutta]

Is there any detonation erosion on the other pistons?

[mittens]

All look like this, soild edges, smooth, &

[1tommygunner1927]

All look like this, soild edges, smooth, &

WOW, you're a good man, Mr. Mittens! You handled this well and the new stuff looks great!

Those end cylinders run leaner (hotter) than the middle two needing more fuel. Its quite evident in the pic of the head. Maybe its time for a stand alone ecu.

[mittens]

In my experience & most others the middle 2 jugs run leaner from direct air flow. Riva/ Jesus & Dean have to add fuel to the middle not the ends.

thanks for the compliments so far so good. 3.2 hours & oil change & now another hour or so, about to take it in a all day ride.

[1tommygunner1927]

WOW, you're a good man, Mr. Mittens! You handled this well and the new stuff looks great!

Those end cylinders run leaner (hotter) than the middle two needing more fuel. Its quite evident in the pic of the head. Maybe its time for a stand alone ecu.

In my experience & most others the middle 2 jugs run leaner from direct air flow. Riva/ Jesus & Dean have to add fuel to the middle not the ends.

thanks for the compliments so far so good. 3.2 hours & oil change & now another hour or so, about to take it in a all day ride.

Yup, I got that wrong......again. However, it appears the other end cylinder was somewhat leaner the the middle 2? Are you datalogging?

[mittens]

Why do you say the other end was leaner? All 3 pistons that made it all look the same. Plugs looked the same as well when reading them. I do not data log. Don't have the ability. But I don't see this as a lean condition. I keep it fat 11.7AFRs but that rear just got too hot from exhaust gas temps / long long time.

[1tommygunner1927]

Why do you say the other end was leaner? All 3 pistons that made it all look the same. Plugs looked the same as well when reading them. I do not data log. Don't have the ability. But I don't see this as a lean condition. I keep it fat 11.7AFRs but that rear just got too hot from exhaust gas temps / long long time.

11.7:1 afr may not be rich enough, especially if you're using pump 93 octane. At your level of performance datalogging is highy desirable in order to "see" knock and other important tuning factors. At a minimum, consider switching to Maptuner, or go MoTeC.

[mittens]

Well I don't have maptuner. Use deans team. & personally not looking to push it past 93 octain. Whole point is to stay at that level. Has been fine for 2 years until just abused.

[1tommygunner1927]

Well I don't have maptuner. Use deans team. & personally not looking to push it past 93 octain. Whole point is to stay at that level. Has been fine for 2 years until just abused.

Abused or 1 tank of bad gasoline will have the same results at your current level, but it is avoidable. Proceed with caution.

[hotbutta]

Bad gas would have shown damage on the other pistons. This is the result of too much heat for too little piston to wall clearance that Yamaha puts in to pass emissions. I wish Mittens would have honed out the new block. With the right numbers, 6 miles is not abuse. Mark Hahn knows what I mean.

[1tommygunner1927]

Bad gas would have shown damage on the other pistons. This is the result of too much heat for too little piston to wall clearance that Yamaha puts in to pass emissions. I wish Mittens would have honed out the new block. With the right numbers, 6 miles is not abuse. Mark Hahn knows what I mean.

I agree, however, I was referring to the possibility of it in the future; buying fresh 93 pump gas but its actually 89 or 87 octane, and stale!.

With his current tune, stock internals/clearances, 20# of boost, and "fresh" 93, he's at the limit.

[mittens]

Little update.
installed R&D grate. First day with it I did notice it handled rolling waves better. So hook up in chop was better then stock cut grate. Speeds seemed close maybe 0.5-1mph faster.. hard to tell small changes on different days.

second day out I swapped back to 85mm nozzle as temps where in 70s not 85-90.
9240 rpm's, 94mph, right at 20 lbs of boost 19.7-20.0 at WOT.
was a little cooler and & I had fastened it up to 11.4-11.5 AFR just shot at the fuel to get safer with temp change 53psi vs 51 from week before. I think the 87mm nozzle works good in the heat 85-95 degrees & in then cooler days swapping back to the 85mm bring rpm's back to make up for the gain. 93 in heat 94 in 72 degree weather.

maybe some tweaking AFR, & holding it longer with less shit in ski (beer, fuel, tools) get 95? Who knows. Happy it's back together. Probably only have 1-2 more rides this season. Debating a dual stage boost controller over winter so I have a 17-18 setting for most the time & then a 20psi on a switch just when needed. Maybe keep it safer for 99% of the messing around.