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(Not*) Mediocre 242

all good. curious to see how it performs, been hearing a lot of good stuff regarding xonas
 
The compressor map is honestly perfect for what I want. Here it is:

npDcGCAl.jpg


If you or anyone else ever has questions about Xona or TiAL turbos, I'm happy to get whatever information or compressor map you need. I've put a lot of work into making the Xona data more accessible but things can still definitely be confusing.

I'm hoping to get this on the dyno in a week or two, so I'll try my best to remember to post here again with results.
 
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I put some ethanol in this weekend and was driving around on E58 last night testing the new turbo. My full target of 30 psi comes in at E60, so I was just barely below that, targeting 28.4 psi. At ~7200 RPM, Motec calculated my inlet mass flow to be 73.6 lb/min. I need to verify this on the dyno, but my injector data should be pretty good, so the inlet mass flow value should be reasonably accurate. That means I should be making a little above 700 hp. This also lines up well with the compressor map, so just another bit of evidence that it's making pretty good power.

I'm happy with this turbo, and the high efficiency islands are great. At my peak boost, I should be right around 78% efficiency. There's still more left in the turbo, but I think I'm going to leave it at 30 psi all in. I don't really want to start killing parts.

I really need to figure out how to implement my downshift blipping properly. Once I figure that out, it's going to be such a blast to drive.

1sMWhfL - Imgur.png
 
i'm kind of surprised you're not scattering anything already, but i guess that demonstrates the longevity of a drivetrain if it's treated right. i don't remember, does it still have a stock rear end?
 
Quin said:
i'm kind of surprised you're not scattering anything already, but i guess that demonstrates the longevity of a drivetrain if it's treated right. i don't remember, does it still have a stock rear end?
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It has a truetrac, but axles and stuff are stock.

I haven't ever used big sticky tires and tried to launch at high boost, so that probably helps keep things together. Mostly pulls from a roll.
 
RoadRacer4Life said:
If you don't upload a video of this thing driving soon I'm gonna scream. I need some IN CAR DSG ACTION ASAP!!!!
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I'll see what I can do, but it'll be a bit. I just pulled the exhaust manifold off last night so I can get some EGT and EMAP bungs welded on. I'm gonna instrument EMAP right away so I can get the data when I go to the dyno. EGT isn't going to happen right now, but I want the bungs there for the future.

I also am swapping my turbine housing from a .82 A/R to a .63 A/R. I want a little boost lower in the RPM range, and the turbine should still flow enough for some good power.
 
While I was swapping to the smaller turbine housing, I had EMAP and EGT bungs added. I'll leave the EGT bungs plugged for now, but I wanted my manifold to be ready in case I came across a deal or something on the signal amplifier and thermocouples.

smqeX0Fl.jpg


I also made the oil feed part hard line instead of a hose all the way to the block while I had the manifold off.

xN30Wojl.jpg


The smaller turbine housing was definitely the right choice. Based on my logs I haven't lost any power, my EMAP:IMAP ratio is right around 1:1, and I get boost ~700-1000 RPM lower in the range.

I'm going to the dyno on Saturday, so I'll get some more data and hopefully validate my ECU mass flow numbers. I'm hoping for something between 600-650 whp, but we'll see.
 
Did you have to use one of those canisters for the emap sensor. i just installed a emap on my wagon because its blowing the valves open intermittently and im wondering if i need a canister before i ultimately condemn the manifold/turbo.
 
cosbySweater said:
Did you have to use one of those canisters for the emap sensor. i just installed a emap on my wagon because its blowing the valves open intermittently and im wondering if i need a canister before i ultimately condemn the manifold/turbo.
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Yeah I'm using a canister. The EMAP signal is surprisingly smooth with it. But you don't necessarily need a canister. A test car I've worked on uses a pretty nice sensor just plumbed straight to the manifold with tubing.
 
okay cool, im using a international emap sensor right now and its pretty smooth but i was just curious. at WOT im seeing 3.5bar emp vs 1.8bar map......

car looks really nice man cant wait to hear how the dyno goes
 
cosbySweater said:
okay cool, im using a international emap sensor right now and its pretty smooth but i was just curious. at WOT im seeing 3.5bar emp vs 1.8bar map......

car looks really nice man cant wait to hear how the dyno goes
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Nice, I'd say you're probably fine with no damper canister, but it may affect the life of the sensor.

That's definitely not ideal backpressure. Might as well get a bigger turbo lol.
 
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