I have a d16y8, and plan on getting the ihi rhb5 turbo. My engine uses 87 octane gas. Would i need to run on higher octane gas with that turbo? I guess it has to do with tuning as well, but im asking because i saw the price of gas for 87 octane today at almost $1/litre and the thought of having to use higher octane gas kinda scares me now :P

 

Just part of boosting.

you 'could' do a low psi 87oct ign tune that wouldnt ping, but why?

Just for ***** and gigs, I put 87 in my Wagon once, and I couldnt believe how much it ------- pinged. Night and day for me.

 

Really? Damn. What octane would you recommend then? I think the gas station that i go to only has 87 91 and 93

 

The difference on a fill in a Honda is what 4-5 dollars CDN [you said litres].If $20 CDN a month is a problem you shouldn't even be considering a turbo.

 

For a HMT setup, I'm doubting this guy is going to hit knock limit on 87 octane, much less on 93 octane. D-series knock limit is 350-380 whp depending on what you have bolted to the engine... I bet he's looking for 200-225 tops. 87 octane will do that for you. Just yank timing out all across the ignition map and call it a done deal.

 

Just run 93 .. its worth it

 

Worth it, how?

Characteristics of 87 octane cause it to consume more hydrogen early on in the combustion reaction, before enough water is formed to significantly cool chamber temps. Uncontrolled/uncontrollable hydrogen combustion is what leads to pre-ignition in some cases - and is the case we're worried about when considering the knock limit of 87 octane.

Regular available at any gas pump 91-94 octane does not contain any significant amount more energy than 87 octane does. You will not make any more or less power depending on gasoline flavor unless you are approaching the knock limit of your engine/setup - which in this case we aren't.

I've been dealing with combustion reactions, alternate fuels, additives, and diluents for power injection for the last six months. I can tell you that, while untried by yours truly as of yet, there is significant potential for silly cheap agricultural fertilizer rich in nitrogen, oxygen, carbon to add power when blended with gas or with some mixture to be injected into your engine. The nitrogen rich compounds are the ones that make killer power, and normally run a bit cooler/safer than the hydrogen rich compounds. How about old fashioned ascorbic acid powder, available in bulk at pennies a pound, aka Vitamin C, which will get it's testing in the near future? Or how about something tried, true, and documented - like hydrazine, where 20 mL per gallon renders 10% increase in power, and is commonly available in an easy to handle 35% diluted form called Scav-Ox used to clean boilers. EHN aka Cetane Improver to speed combustion reaction with next to no impact on effective octane.

Just because you need a different ignition map, and have a potential for fuel map tweakage, because you are running a different octane doesn't mean it's a waste of time or won't work. Think outside of the box, pls kthx!

 

^^ Well said and stated, I'm running to buy some fertilizer !!! woot, getto NOS


Anyways, I'm planing on running 87 on my to-be boosted accord too, u just need to tune it with 87 and it will be fine, less $ on gas= more $ to make boost safer

 

hi I live in the netherlands
we have only octane 95 1 litre now for 1,33 euro (and rising) dunnow how many $ that is, but its a lot -_-
we also have octane 98 (most of the crx drive on it), how ever its used for high compression cars, and crx isnt. just about 9,5:1 If you instal a turbo; the compression will rise ofcourse.. so if you think gas is expensive, you should stop driving cars, and not even considering comming to Europe... :P

 

so whats considerd a low boost set up? And is this an issue of psi or cfm?

87oct hit $2.50 today didn't see what 91oct was.