I've been wondering if i should use 89, or 91 on my SOHC D15. Any ideas?

 

well if your cheap then just use regular but if you have money then use premium because you car will feel faster! lol, i would reccomend you use 89

 

hmmmmm so i can run 87? Wouldn't that be bad for the engine?

 

if your car is near stock or just bolt-ons, 87 will do.

 

I've heard that the lowest octane gas you can run, w/o detonation or "ping" will yield the highest test power.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by =GAMEOVA= &raquo;</TD></TR><TR><TD CLASS="quote">if your car is near stock or just bolt-ons, 87 will do.</TD></TR></TABLE>
yup

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EG2 SiR &raquo;</TD></TR><TR><TD CLASS="quote">I've heard that the lowest octane gas you can run, w/o detonation or "ping" will yield the highest test power. </TD></TR></TABLE>
i have seen that this is true with stock internals and b elow 11.1 comp anything more and 91+ is usefull

 

high octane gases are for high compression engines..
if you put low octane gas in a high compression engine.. then the gas will explode during compression before the spark plug ignites it..
on the other hand.. if you have a low compression engine.. then you can use low octane gas since it won't explode during compression.. and will explode when the spark plug ignites it which is what we want

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EG2 SiR &raquo;</TD></TR><TR><TD CLASS="quote">I've heard that the lowest octane gas you can run, w/o detonation or "ping" will yield the highest test power. </TD></TR></TABLE>

We have a winner.

 

I have a JDM GSR and i was wondering the same thing about gas. I wanted to know if the 87 would work or if i should use premeium

 

no I wouldn't use 87 on GSR, unless you like your engine to knock.

 

what about 89 or should i just pay the extra $1 and get the 91

 

Just use 91

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 0ptimus Prime &raquo;</TD></TR><TR><TD CLASS="quote">I've been wondering if i should use 89, or 91 on my SOHC D15. Any ideas? </TD></TR></TABLE>
the cars compression ratio is well under 10.0:1, anything over 87 will be a waste, and you will not gain power. higher octane=higher power is an old wives tale.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EG2 SiR &raquo;</TD></TR><TR><TD CLASS="quote">I've heard that the lowest octane gas you can run, w/o detonation or "ping" will yield the highest test power. </TD></TR></TABLE>
so very true

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LiL Jon &raquo;</TD></TR><TR><TD CLASS="quote">Just use 91</TD></TR></TABLE>
obviously you do not know what you are talking about when it comes to fuel.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 0ptimus Prime &raquo;</TD></TR><TR><TD CLASS="quote">hmmmmm so i can run 87? Wouldn't that be bad for the engine?</TD></TR></TABLE>
no that would be very good, as 89+ will not be completely cumbusted, and will add carbon deposits to your valves, pistons, cumbustion chamber, and exhaust ports, and can lead to the clogging of your catalytic converter. what you need to do is pick a specific brand of fuel, and don't jump around from brand to brand. my preference is chevron. every oil company uses the same amount of detergent between there own grades of fuel. while you may find the off brand or mom and pop gas station cheaper, they still are selling a major companies fuel. they buy whatever brand of fuel is cheapest on the day of their order. this fuel is called generic brand fuel, but still comes from the major oil companies. the difference in price is because the detergent level in the fuel is only made to the minimum standars of the EPA resulting in the price difference, while the name brand stations level of detergent is much higher. this is why you may of heard in the past of people say they have gotten bad gas from that off brand.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GAMEOVA &raquo;</TD></TR><TR><TD CLASS="quote">if your car is near stock or just bolt-ons, 87 will do.</TD></TR></TABLE>
until those bolt on include nitrous, forced induction, advanced timing, or something to raise compression 87 is all you will ever need





Modified by Huggy Bear at 1:21 AM 5/20/2004

 

i have a jdm d15b... and i ran 91 octane for quite some time.

switched to 87, and the butt dyno says its better