Finally got around to installing my TBE. Only took two years from when I bought the car. :-) Went with a Helix v2 DP, Mil.Spec 100 cps cat, and RRE Stealth catback. Got it all installed and did a bit of tuning. Some highlights:

- 92 octane gase
- Have not touched AFR from those of the baseline tune. Still need to get my wideband installed. (AFR with stock motor was tuned previously via mail-in tune and then some fine tuning based on knock.)
- I'm able to run 1-2 deg timing across the entire rpm range.
- Tuned in 1-2 more psi in the mid-rpms.
- WGDC curve no longer needs to have any peaks/dips to maintain a smooth boost curve.
- The peak numbers did not increase greatly, but area under the curve is massively improved.
- The car is noticeably spunkier driving around town at low rpms.
- Doubt I could have got these numbers if I was using any other cat but this one.
- I gotta hand it to RRE for the noise control. If anything, its more quiet than stock from inside the cabin. Outside its definitely a bit louder, but nothing obnoxious at all.

Overall, I'm pretty happy with the result, but I'd still like more power. I would be curious to see the timing/AFR/MIVEC maps of other people running a TBE on 92 octane (OR, WA, elsewhere?).

 

Are you in WA? Btw seems like you should be able to extract a little more than 11degrees of advance up top. I run 92 and usually see about 12 or sometimes 13 if its cold up top. I usually hit about 19psi at 7000 too. My cars running too rich though and with that timing I'm seeing about 1650F on my Defi EGT at the end of 4th...no knock though. I really need to get a good A/f setup.

 

pretty darn good, I also only got a TBE and I see pretty much same timing 10 uptop.

 

Depends on who wants to know

1650F?!?!! Is that a typo? Your EGT probe might be going or something is wrong with the car. Thats pretty high for your mods/tune.

Mrfred still doesn't have his wideband so probably best to leave the timing alone for now until he knows exactly where it is.

 

Great results.

Mrfred, now you need to change your signature to read "MIL.SPEC 100 cell cat" as atlvalet no longer exists on this forum

 

Nope my EGT was brand new Defi BF I just installed per Evomoto (2nd runner about 2.5in from the head). Put in my stock tune today and only peaked to 1550f max. So I will be running my stock one until I am retuned.

 

Remember EGT's reach maximum dangerous point at the turbo where it restricts...not in the runner. I made a post somewhere else about this, but with modern metallurgy you can sustain higher EGT's than used to be thought safe.

However that aside-

800*C (1472*F) is considered the maximum AT the turbo. It is usually 250-300* cooler than the runner.

Looks your car definitely needs a retune, your mods shouldnt have changed it that much I wouldnt think. Hard to say with all the other problems we were having with some of those "Brand X" parts that were on there.

 

Yes that damn blue pill really screwed me. The tune still runs fine but I bet it could really be touched up now that the car runs the correct mods. I am working on getting a WB soon though so that should help in retuning. Btw what the max EGT I should see in the 2nd runner?

 

I generally use 250* as my rule of thumb from the middle of the runner to the turbo (works on big diesels anyway) so if you are seeing 1700 or 1725 thats about 1470 (800*C) at the turbo, or max continuously. This is based on what I have learned from diesels and other turbo cars. There is room for me to learn though, so dont take what I say as gospel.

There is also the 15-20 second rule. You can run higher than that but not for any pull longer than 15-20 seconds (diesel rule). Diesel EGTs are always lower than gas and the other turbo gas cars I have seen are always faster with higher EGT's (to a point).

Is there an engineer in the house?