What can I do for 30-40 more hp?

[Roy]

<blockquote>quote:</font><hr>Originally posted by phoenix64:
race gas or 100 octane makes more power because it is better formulated. It has more hydrocarbons and it makes a bigger bang. even in our cars.<hr></blockquote>
octane is the resistance to detonation.... higher octane gas on a stock motor will only make the car faster if you are experiencing knock retard. If you are not experiencing knock retard it may actually hurt since it will detonate later than expected

maybe if you lean it out lots and advance the timing a lot, to the point where 100 octane is needed, then i would increase power. by itself on a stock program it wouldnt gain any power (assuming no real knock).


<blockquote>quote:</font><hr>Originally posted by Fat_kid_in_little_camaro:
of course there aren't any visible gains in going from 89-92 octane. but when you jump up to the 100 octane, you can feel a difference. why do you think it cost so much more? <hr></blockquote>

[img]graemlins/dunce.gif[/img]

i hope to god youre kidding. it costs more because its a longer process to make (more refining and whatever else they do), more chemicals to reduce the burn rate, and is less common of a gas.

i dont know the processes of making gas or what is done to it, but i dont know the jists of it. 100 octane isnt like caffine for your car where all of a sudden you will gain a bunch of power, especially cause it "costs more" :rolleyes:

[Dominic]

<blockquote>quote:</font><hr>Originally posted by Fat_kid_in_little_camaro:
of course there aren't any visible gains in going from 89-92 octane. but when you jump up to the 100 octane, you can feel a difference. why do you think it cost so much more?<hr></blockquote>

No, higher octane wont give you more power, it only reduces knock and ping. If you have no preignition (knock, ping) then don't bother with that. Go read up on octane please.

[Only4U]

i'm quite curious myself as to if this maft+ can be custom built by any single person. does anyone here know where this info can be found or anyone know about doing this yourself? thx.

[magic1872]

NOS

[Cale]

<blockquote>quote:</font><hr>Originally posted by magic1872:
NOS<hr></blockquote>

NNNNAAAAAWWWWSSSSSZZZZZZZ

[Silver3800V6FBodyKY]

Something I'm looking into while I have my engine opened up putting a cam in is raising my compression. I've calculated that if I raise my compression to 11.0:1 I can gain about 30 Horsepower at the rear wheels. That along with a cam will give you about 55 - 60 additional horsepower. Also, the higher compression would work great with Nitrous if you decide to get that later down the road.

[Dominic]

If say with a cam alone you made 260hp, going to 11:1 would push you to 300hp - pretty incredible power increase if you don't knock/ping on super at those levels.

[Silver3800V6FBodyKY]

Very true Dominic. I would definately need to run 93 all the time, and maybe even octane boost. I'm not sure the limits of Compression on 93 octane but I'm guessing it's between 10.8 and 11.2. I know that Winston Cup cars, with a 12.0:1 compression run 104 octane, so I'm thinking I might be good to go with 93 and not have any knock or detonation.

[V6Bob]

"I know that Winston Cup cars, with a 12.0:1 compression run 104 octane"

Their piston head/combustion chamber design is just a tad more sophisticated than yours :D .

[zlightning]

You all are gonna hafta make me brake out the damn article aren't you. Well I'll try to find it and post the numbers for all of you trying to say I'm wrong oh yeah there was no I repeat no knock on the car and the higher the octane the more power.

[Ttop34]

Just curious zlightning, what car are you talking about? A V6 Fbody with a stock computer?

[Roy]

every full point increase in compression you get 3% increased power at the rear. forgot what stock is- like 9.5? you can easily raise compression by taking some material off your heads. in turn, you will need shorter pushrods though (unless you have a smaller base circle after a cam swap).

I got my heads milled down to raise the compression to around 11.3. I will still be able to run 93 on the street no problem. I may want to run 100 at the track and advance the timing to get the most out of my car though.

i dont know if you guys have aluminum heads, but if so, then 11.1:1 compression is fine with 93 octane.

FWIW im hoping to see 12RWHP at the rear with my increase in compression. if i get more, ill be happy...

[zlightning]

It was a v8 but the same pricipal should still apply considering the engine did not have knock when they tested it. The jump in hp and tq was not much but ever little bit helps right. I'm still looking for the magazine. I have been cataloging them all and have yet to come across it but I am sure it had the article on the front page. Something like does fuel really matter or something.

[V6Bob]

zlightning - here's what might be going on.

If a car has knock sensors (like ours) it will retard the ignition to avoid knock. So, with knock sensors, if you use too low octane the car will be slower and still will not knock. That might be the message of the article you saw.

Too low octane is bad whether the car knocks or not, but once you have what the car is designed for and are avoiding knock or ignition retard, just increasing octane more will not add power.

[Ttop34]

Actually the LS1 has higher compression so it needs the higher octane to not ping. I know a guy that runs regular in his LS1 and he says it pings a little but still runs, what a chode. He's more concerned with saving a couple of dollars at the pump and risking his engine. I'm not sure, but I bet the LS1's computer is able to take advantage of the octane beter than our cars can stock.