I'm running a Markski tune on my car.

 

But still, I thought that was a fundamental safeguard built into the Bosch ECU.

 

I had an issue where my 3 stage fuel pump wasn't ramping up because the sensor wasn't set up property and it shut itself down into limp mode of some sort.

 

Octane related?

 

It pulls timing when it detects knock events, not directly based on fuel quality, but lower fuel quality can lead to increase knock events so in that sense it does pull it out. The ECU doesn't really learn to keep the timing out long term though it tries to restore timing to the target as quickly as possible from the hundreds of logs I've seen, and then if it detects knock again it pulls it back down again, sometimes by pulling out more and for longer duration. There are also different severity levels that change how much timing is removed and how long it is kept out, but the knock based timing cuts only last a few seconds. It works this way because the low quality fuel isn't going to knock under low load conditions so it goes back to what Porsche decided was optimal for the engine/emissions, you can run these cars on 87 without knock if you don't get into boost.

 

it is a tunable parameter. It shouldn't be touched imo, but I've heard years ago that some do because stock it is very conservative and on modded cars ends up pulling timing out for false knock which ends up limiting power.

 

That makes sense, although, I don't think I'd like to run on 87...

Cheers,

 

used to love the smell of VP U4 and C12 from 4-stroke MX bikes as the roost used to hit my face.

Does it smell like that..?

 

I'd do it if I could force the wastegates open..

When people say getting into boost..does that mean like getting into it from a 2nd to 3rd gear highway merge or does boost mean hitting .2 bar in traffic?

I've read certain tuners say not to get into boost when breaking in new turbos but i find it hard not to get into boost unless you're going really slow from stops. My TT goes into boost if im on the highway and hit an incline..it might only be .1 or .2 bar but its still in boost and will stay there depending how long the incline is

 

Generally, people mean no full throttle full boost pulls. Even on catpiss gas you're fine with 3-5psi putzing around.

 

I have catless straight pipes and my exhaust does not smell at all even when I stick my nose right up to the exhaust pipe. I think the reason some complain that their catless application smell is due to a poor tune which results in an overly rich idle mixture which allows you to smell the unburnt fuel exiting the exhaust, hence the rotten egg smell. I don't really know of any of the mainstream "tuners" addressing any of the idle and part throttle maps. They all essentially just "tune" the top end based on a 3 or 4th gear pull datalog. There is very little "tuning" that is done besides that contrary to what many may believe. I think that is the overriding issue here.

 

Most stock maps are not tuned for this either.

So are you saying the afrs need to be leaned out @ lower rpms?

 

I am not a tuner myself but I know Cervelli spent a tremendous amount of time with my car on his mainline dyno tuning the low and partial throttle low load maps. Not just my car actually, whenever he tunes any car, a large part of the process is focused on low load and off throttle tuning, not just the high load full throttle maps. This is what gives you excellent drivability even when putting around at 1000rpms in traffic with a LWFW assembly for example. The guys that bitch about how their car behaves with a LWFW and recommend a DMFW as a result typically don't realize that their tune is crap and is the culprit.

 

Every quality tuner should be tuning for part throttle and WOT. And the idle is mostly target based I'm sure. Unless the car is dumping fuel, it really shouldn't smell. My car smells fine, not noxious at all. The idle is always targeting 14.7.

 

Castor based Blendzall oil smells great and reminds me of my youth.

What has been said re tuning and the noxious fumes of un-burnt fuel makes sense. I only smelled it when idling and who does that for long. The unburnt fuel smell is livable. I just learned to avoid "karen" while tempting fate running catless in CA. The CHP can impound a car if it is found running without cats. I was thinking of going catless again but I think I'd have to deal once again with bung extenders or whatever I had used to eliminate cels. It's been some years but I do recall that the car enjoyed it's time as an outlaw in CA.