I'm tuned with OSIRIS on 91 octane (CA) and WG is allowing ~8psi. If I start using 93 octane (NY) could I/Should I open WG to, say, 9psi? IF its tuned properly on 91oct, what is the effect of using 93oct, without tuning for 93oct?

 

Fail plan imo

 

It's a question, not a .

I'm getting out of the Marine Corps in a month, stationed in Camp Pendleton, CA for 4 years. My VQ has been in CA since "born", where 91 octane is the highest fuel I've ever seen. My car will be transported with me back to NY, where 93 octane is available. My question is based on whether or not it would run rich on 93 octane...if someone with knowledge knows, will Osiris be able to adjust to 93? should i turn up waste gate slightly to compensate? or should I just continue to use 91 in NY?

There are no Uprev tuners near me in NY...plus I'm not keen on dropping another $350+ on a new FI tune.

 

Why not? Including an additional map for 93 would be the best option.

 

I agree, it would be the best option. But in searching UPREV.com find dealers it seems that the closest is 3 hours away. We're talking a 8-9 hour day. Plus tune, gas, and wear and tear. I'll call Uprev tomorrow to see what they say as to the three option's I believe are most feasible.

 

You can do it. No re-tune needed for 1psi jump and 93 is better anyways-imo. I jumped 5.5psi to 8psi no prob/no retune-stock block. Runs perfectly fine here in SC on 93oct all day. Im no tuner at all--So dont take my words--anyonecan blow anyday anywhere anytime.

 

^No change in AFR?

If your on Pendleton, there's Church's and GTM that I know of off the top of my head. Both shops are under 2 hours from that location.

 

There's no 93 octane in CA that I know of.

 

So you jumped from a dynotuned 91oct @5.5psi...to 8psi and 93oct?

 

Always ran 93 octane. Yea. I'd say around 5.5-6 & went to about 8-8.5psi.
AFR has always been around 10.2 - 11.2 range.

 

octane in a fuel will not affect your tune one bit. So if you put 91 or 93 in it the tune will stay the same.

Do not listen to anyone that says raise the boost without a retune. That's a recipe for a blown engine. If you change the pressure at all you need to have a person with experience tune it to make sure it's safe.

 

Yea. I told him not to listen to me. I've been ok. But I don't do anything crazy. And I think I backed out to about 7ish psi mark last month. Going more for appearance now anyways. So the HP stuff cn wait for later.

 

Okay so this seems to answer my question. 93 will not make a 91 tune run rich. Thank you.

 

True, but shops can mimic a different octane if required.
I understand there's little difference between 91 and 93, but to what extent does your statement hold true? What about using 100 octane or higher on the same tune?

 

Good points

I agree

 

binder knows his stuff, so let him be the end all if he will chime back in. I think the point he made was that the octane does not effect the volume of fuel that is being injected. Meaning you AFR would not change.

That being said my understaning is you could tune for more boost and cam advancement with a higher octane being you are reducing the chance of detonation.

 

That's what I got out of it too. Thanks for the response.

 

octane aside..if ur turning the boost up then you need to tune for that...if your bringing the car to ny then you might as well wait and go fill up on 93 run thru a tank then fill up again and go to either r/t tuning in pa or performance motorsports in ny for a tune with the added boost and the 93 octane...i beleive those are pretty much your only 2 options for the uprev software

 

your boost probably already swings between 7 and 9psi

 

The dyno sheet said 7.97psi...I assume that is Max boost.