Can I get away with 91 Octane with a 525SC
09-14-2009 | 07:58 PM
#12
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Joined: Feb 2002
Posts: 6,656
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From: Lake Michigan
I have run 89 for 6 seasons when had the 525SC's... Just make sure your timing is set at no more than 35*@4500rpms.
Don't waste your time on an innercooler.
Don't waste your time on an innercooler.
Last edited by Back4More; 09-15-2009 at 09:18 PM.
09-14-2009 | 08:23 PM
#13
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Joined: Oct 2000
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From: Omaha/LOTO
I'm 99% sure you will be fine running the 91 octane on a stock 525SC. I ran 92 octane in mine and had the boost cranked up to almost 8# with no chiller. Never any problems at all and it had over 400hrs on it. Stock boost on a 525SC is 5.5#. Maybe dial the timing back 2 degrees to be 100% safe, but I highly doubt you really need to.
BTW, full advance on the timing does not come in until about 4500rpms.
BTW, full advance on the timing does not come in until about 4500rpms.
Last edited by Griff; 09-14-2009 at 08:40 PM.
09-14-2009 | 09:34 PM
#15
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From: NW Michigan
running them rich doesn't really help in the detonation though. you still need sufficient octane to with stand the combination of heat and pressure.
Last edited by getrdunn; 09-14-2009 at 09:49 PM.
09-15-2009 | 02:15 AM
#16
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From: Omaha/LOTO
Running a little rich will help keep cylinder temps down and help avoid detonation. They are plenty rich from Merc and have #98 jets squared. I had ran mine up to about 5 mins at WOT, buit mostly only 2-3 mins. The water temp would creep up about 5-10* and I would back off.
09-15-2009 | 07:54 AM
#17
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From: Lake Michigan
09-16-2009 | 12:07 AM
#19
Rob
Joined: Aug 2001
Posts: 21,637
Likes: 12
From: Ms
Mississippi math
say you burn 300 gallons a month , the differance in gas price 91 to 93 at $2.75 is usally 10 cents,thats $30 dollars a month you save.
But being thats all ya have there, like Biggus says,Ive never liked running timming real low,exhaust temps on pump gas
thats my $30.00 worthGoodluck
Rob
say you burn 300 gallons a month , the differance in gas price 91 to 93 at $2.75 is usally 10 cents,thats $30 dollars a month you save.
But being thats all ya have there, like Biggus says,Ive never liked running timming real low,exhaust temps on pump gas
thats my $30.00 worth
GoodluckRob
__________________
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The Only Time You Have To Much Ammo Is When Your Swimming Or On Fire.
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The Only Time You Have To Much Ammo Is When Your Swimming Or On Fire.
Last edited by Strip Poker 388; 09-16-2009 at 12:13 AM.
09-16-2009 | 01:18 AM
#20
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Joined: Jul 2007
Posts: 988
Likes: 2
From: San Diego
Mississippi math
say you burn 300 gallons a month , the differance in gas price 91 to 93 at $2.75 is usally 10 cents,thats $30 dollars a month you save.
But being thats all ya have there, like Biggus says,Ive never liked running timming real low,exhaust temps on pump gas
thats my $30.00 worthGoodluck
Rob
say you burn 300 gallons a month , the differance in gas price 91 to 93 at $2.75 is usally 10 cents,thats $30 dollars a month you save.
But being thats all ya have there, like Biggus says,Ive never liked running timming real low,exhaust temps on pump gas
thats my $30.00 worth
GoodluckRob
Unfortunately we can't even get 93 at the pumps where I boat in SOCAL. 91 is tops. I would gladly spend the extra 30 bucks for the added protection.
Darrell.
