Quote from: Brucelinc on July 21, 2013, 05:57:02 PM
What was done to make a stage 4 that could be run on 91 octane - and how much more aggressive can it be than stage 3 without risk of detonation?  There may be a lot less difference between stages 3 and 4 on 91 octane than there is on the 93 (or higher) octane versions. 

That's is what I was thinking also. But with the Mycal, more parameters can be adjusted, so stage 4 may be more noticeable.

Yes, maybe with the MyCal, the stage 4/91 will be better.  I think the stage 4/91 is relatively new and was not even available with the SCT when I got my tunes back in January.

I know there has been much discussion on this but when I got my tunes, I asked Rick lots of questions about differences between the tunes.  Some he couldn't answer and had to go to Dan before he could get back to me.  At that time, he told me that stage 4+ had higher boost (up to 14.5-15 PSI), advanced timing, and altered A/F ratio.  It was also set up to hold the boost longer into the RPM range.  He stressed that it was really designed for 94 octane but many used 93 and got along fine.

When I went from stage 3 to stage 4+, the most striking difference I found was at about 4000 RPM and higher.  From a dig, launching at 1500 or so, I could not tell a huge difference.  Both would break the tires loose for a second or so and chirp again on the 1-2 shift.  However, from 4000 - 6500, the stage 4+ was crazy strong compared with stage 3.  Overall drivability was smoother and transmission behavior was more refined after about 100 miles or so.

Just my 2 cents....

So what's this about a 91/4 tune? When I got my in March they only offered 2 and 3 for 91 octane. Is this dependent on the MyCal vs SCT?

On a happier note I did find 93 octane locally - however its E10, how will that impact usage (if at all) w/stage 4+?

Thanks Guys!!!!

Mark

Ethanol is actually a high octance fuel - that is probably how they got the octane rating.  I think you'd be fine with E10.

Here in Minneapolis, the only way to get 93 is with an ethanol blend and that is all I use.  My car seems quite happy with it. 

Speaking of that Bruce - you asked me about 93 octane in Des Moines on "the other forum". Well (as seen above) I did find it in ONE location. Its at the Murphy USA station in Altoona just of I80  north of Des Moines not too far east of I35, so should be easy access for you as you head south from the Cities. Addie is 3405 8th St SW, Altoona, IA 50009

Check out google maps.

Now to get Stage 4+ for me!!!!!! 

Vernonator, that is good to know!  I go to Southern Iowa a few times a year to visit family.  Ecobrick Bob informed me that 93 was available at Murphy USA in Mason City.  That is where I have been filling up on my way to and from Southern Iowa.  The Altoona location will be more convenient since I always take the bypass around Des Moines on my way to Indianola and go right by there.

Quote from: Brucelinc on July 22, 2013, 12:13:02 PM
Vernonator, that is good to know!  I go to Southern Iowa a few times a year to visit family.  Ecobrick Bob informed me that 93 was available at Murphy USA in Mason City.  That is where I have been filling up on my way to and from Southern Iowa.  The Altoona location will be more convenient since I always take the bypass around Des Moines on my way to Indianola and go right by there.

Good to hear!!! I am kicking myself about this one. It's like 5mi from my house and I drive by it probably 1x week to get to Lowes. Never stopped to even look what they had. 

Quote from: Brucelinc on July 22, 2013, 11:26:44 AM
Here in Minneapolis, the only way to get 93 is with an ethanol blend and that is all I use.  My car seems quite happy with it.

Bruce, where in Minneapolis do you find 93?  I'm taking delivery in Sept and plan to have it tuned that week.  I've only ever seen 92 around here.  I'm in Plymouth.

Thanks
Art

Any BP gas station.

Quote from: ecoboostsho on July 22, 2013, 03:05:36 PM
Any BP gas station.

Not by me, 92 is the max at the few BP's I've checked.

The BP on Bass Lake Road/494 has 93.  So does the BP in Champlin - that is where I buy mine.  There is a BP at 3855 Plymouth Blvd. that has 93 - I just called them to confirm.   

Hmmm...in the southern metro (Bloomington, Lakeville, Burnsville) there are a number of BP's that have 93 Octane.  At least that is what the label says!  Hope they are advertising correctly...I don't understand why BP would bother to have different octane ratings in different areas around Minneapolis...seems like it would be a distribution nightmare.

Quote from: ecoboostsho on July 22, 2013, 04:03:40 PM
Hmmm...in the southern metro (Bloomington, Lakeville, Burnsville) there are a number of BP's that have 93 Octane.  At least that is what the label says!  Hope they are advertising correctly...I don't understand why BP would bother to have different octane ratings in different areas around Minneapolis...seems like it would be a distribution nightmare.

I agree, that seems like a distribution nightmare.  But the BP in Wayzata and one I stopped at in St Cloud both only had 92.  Interesting.

I appreciate the tips and will check out a few more of the BPs around me.  Good news in all, since I was originally thinking I'd be having to add some Torco Accelerator with every tank.

Art

Will an octane booster do the trick? If you are on a road trip and can't get 93 just toss a booster in right?