Down the rabbit hole -- 2276 MS3X Turbo build

[theDrew]

[Chip]

[theDrew]

well I seem to have reached a milestone in my tuning -- I can make clutch slip.

I have a KEP stage 1 with a copperhead disc. I'm leery to go to a Stage 2 as it might be to harsh.

Maybe theres a stage 1.5?
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Turbo 2276 MS3X build http://www.thesamba.com/vw/forum/viewtopic.php?t=673125
1985 Vanagon Campmobile w/ 2005 EJ25

[clonebug]

I’m using a Stage II AND CB Super disc and .031 shims between flywheel and PP.
Holds to 250 ft lbs plus using a torque wrench.
My turbo engine was slipping the Stage I at 22 lbs boost.

It’s been working nicely all summer.
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[Chip]

[clonebug]

[theDrew]

thanks for the input -- I think I'll step up to the Stage 2 pp, and maybe run a diakin disc.....or maybe stick with my copperhead. Unsure

Either my main seal is leaking or the cam plug....either way I was going to pull the motor to address it, so I'll swap the clutch/pp then.

Took me a while to figure out why my RPM's would go sky high at points in the power band and then it finally donned on me! I just thought my wheels were slipping.
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Turbo 2276 MS3X build http://www.thesamba.com/vw/forum/viewtopic.php?t=673125
1985 Vanagon Campmobile w/ 2005 EJ25

[Splitdog]

You were rotating the earth!

I have a stage II and a Daiken. Very pleased. Holds 235 hp no problem. And streetable as heck.
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CH³NO²

Z = z² + C

Der Blitzkrieg Kafers

#notacallooker

[Chase1]

I was just wondering if you started to tune the accel enrichment? I finally got my project up and running and was having issues with a pretty big off idle stumble. Here is what I did, let me know if this is similar to how you guys did it.

I lowered my accel TPSdot threshold to 20.0 as I had some noise in my TPSdot of 5.8% when idling (I assume it has to do with the wiring close to the coil wiring; I'll get this fixed later). This number will probably be lower once I get more testing done. I left everything else the same. Another point is that I'm not using any MAP based AE correction at this point (or ever).

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This we'll defend.

[theDrew]

Here are my current settings, I'd say there pretty good for my setup, I dont see big dips or spikes in the AFR when I punch the throttle.

First things first, do you have some type of restrictor for the MAP signal to help smooth it out? Otherwise this will be a tough task if you have a noisy signal.
I'm using a MIG tip (.035" i think) to help smooth the signal.

Next, I've found the best method is to go to a parking lot somewhere (so you dont annoy the neighbors) and turn all the AE off and then slowly start turning it up until the engine doesn't stumble and you dont see the AFR go crazy. First to tiny stabs on the throttle, get those right and then slowly make them bigger. Engines are pretty linear so you can start to see the trends once you have a few working data points.

Good luck!

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Turbo 2276 MS3X build http://www.thesamba.com/vw/forum/viewtopic.php?t=673125
1985 Vanagon Campmobile w/ 2005 EJ25

[58ragman]

[Splitdog]

Stage 2 with a daiken. Done.
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CH³NO²

Z = z² + C

Der Blitzkrieg Kafers

#notacallooker

[theDrew]

I think I'm going the cheapest route for me at this point which is Stage 2 with a diakin disc (already have one)

I also noticed one of my rhino engine mounts if split in half...so add that to the list when i take it out.
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Turbo 2276 MS3X build http://www.thesamba.com/vw/forum/viewtopic.php?t=673125
1985 Vanagon Campmobile w/ 2005 EJ25

[theDrew]

guys -- I'm seeing something that I can't explain yet.

After a big pull, I see my oil pressure drop considerably for a moment and then return to normal pressure.

its strange that it only happens AFTER I let off the throttle.

see here (white is OP, red is RPM) -- spun it up to 7k, pressure is pegging out my sensor (60psi sensor), then I let off the throttle, the OP drops to 3psi for 0.3s and then bounces back

its never happened DURING a pull, just after I close the throttle plate.

I have a deep sump, and my oil level is to the top dipstick mark.

can anyone explain this to me?

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Turbo 2276 MS3X build http://www.thesamba.com/vw/forum/viewtopic.php?t=673125
1985 Vanagon Campmobile w/ 2005 EJ25

[jeffrey8164]

[Towel Rail]

I'm tempted to wonder if the oil feed to the turbo is messing with the sensor after the engine RPMs come down (but the turbo still has yet to come down all the way), but I don't know how plausible that is.
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1974 Thing -- under the knife
1967 Beetle -- spring/summer/fall driver
1996 Subaru OBW (EJ22, 5-speed, AWD) -- winter car, 3-seasons "don't feel like biking today" car

049 > 070 > 053 > 009

[theDrew]

[theDrew]

finally got around to swapping the pressure plate.

Doing a Stage 2 with a diakin disc.

pulled off the flywheel, inspected the thrust bearing, changed the main seal and checked the end play. Nice to see its still where I set it.

all the wires, hoses and sensors make pulling the engine a bit of a chore!

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Turbo 2276 MS3X build http://www.thesamba.com/vw/forum/viewtopic.php?t=673125
1985 Vanagon Campmobile w/ 2005 EJ25

[clonebug]

Make sure you try to test the disc and pressure plate before putting it back together.
I tried a Daiken Disc with the Stage II PP and it slipped almost as bad as the Stage I with my CB Super Disc.

I ended up taking the engine out again and testing the discs with a torque wrench and transmission input shaft that I welded a big nut onto the end.

The Stage I and CB super disc held 165 ft. lbs torque on the wrench.
The Stage II and Daiken disc held 175 ft. lbs. torque on the wrench.
I ended up using the Stage II and my original CB Super Disc and adding 0.031 inch shims between the PP and the Fly wheel.
That brought the holding torque all the way up to 250 ft. lbs. on the wrench which also maxed the wrench out...... and it hasn't slipped at 24 lbs boost.

I just pull the body on my buggy to make it much easier for my old lard *ss to work on it.
There is NO room to get at anything without doing that.

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[d5626]

Mine slipped a little above 12psi when using the stage2 w/daiken, what a pain pulling motor again to put in the cb disk. No problem since.