Exactly.

If your tuner goes your route (instead of his) he'll throw his hands in the air when you come back with any kind of issue, and trust me it won't be perfect.

 

Fueling can be compensated for - large margin of error. The fact is that the SS box alters timing coming out of the stock ECU and without a reflash the timing that is run is unpredictable as the stock ECU can alter it on the fly. You can either end up with overly retarded timing which can lead to pre-ignition or overly advanced which can lead to detonation. It's a gamble, plain and simple, without direct control. Osiris provides direct control. There is no comparison.

 

Well technically you do not have direct timing control with Osiris like you do with a full standalone (or UTEC)... you can adjust the 'burn time' but the ECU still kind of does what it wants with the timing. Still better than SS which simply subtracts timing. It's a delicate balance.

 

I think Osriris has more direct control than the UTEC. As the UTEC can only intercept and retard timing? Osiris is changing the timing (advancing/retarding) at the code level.

 

The UTEC completely runs fueling and timing in open loop (when in boost). No adding/subtracting. You can tell it exactly what timing you want in each cell. It's really a bad-@ss piggyback aside from occasional glitches when switching from open/close loop most of which can be tuned out.

You can only adjust 'burn time' in Osiris which calculates timing based on many other parameters and since it's MAF based you lose a lot of resolution in your timing/fuel tables in boost. In other words, the difference between 6 and 10 psi might only be 1 or 2 columns in Osiris while on the UTEC you have a column for every psi of boost (at least when running <10psi).

Note: I'm speaking specifically of the UTEC. Most if not all other piggybacks for our platform do simply add/subtract fuel/timing from the stock ECU program.

 

+1
On boost, Utec is like a standalone. It doesn’t care what the ECU value because it has its own table for fuel and Ignition that it uses. If you want 18deg of timing at 5000rpm and 8psi and that is what you gonna get regaless of what the ECU value. Utec is totally a different piggyback and should not be compared to EU or SS. When you hit boost and open loop (tuning with Speed Density) Utec is just like a standalone with lesser resolution.. lol

 

My tuner has been tuning for well over 15years and he didn't want to touch my SS box he said they are primitive. Mine had a JWT base tune so we did dyno runs and logged everything it was safe so we left it alone. However when i decided to step things up I went with the ecu my tuner wanted (Vipec) because like someone else said it you go aganist him and you have issuses you might get an I told you so.

 

I used the SS box on my Vortech and I used the Haltech EMS . The Haltech of course is night and day difference . But after using both . I would stay with the stock ECU and tune it with the aftermarket tuners for it . There is no other ECU that will do a better job than the stock ECU tuned to what you have added to the car . JMO of course .

 

I am pretty sure that Osiris has complete control over timing. You do not enter the values in degrees BTDC - that is true. There are a couple of different tables that you have to address, but you do have full control based on what I have seen myself in the software and been told by Jared and others at UpRev. I'm not 100% on this because I use the Haltech so haven't bothered confirming...

 

You have control over 1 timing table and it is 'burn time'. Burn time is part of the undefined equation the ECU uses to calculate the actual timing values based on various other inputs. There is no direct correlation between burn time and BTDC, but there is enough that it works out in the end with some trial and error. I still haven't been able to get perfectly consistent timing plots on every pull... the ECU really kind of does it's own thing alot of times. In regards to timing control, UTEC and standalone certainly win.