Timing vs. Boost

[gasguzzler]

I decided to do a little reading over on the corral and it sounds like they are leaning more towards running more boost out of a k/b supercharger and less timing. I was thinking you'd be better off running more timing and less boost. What do you guys think? Thanks - Brian

 

[Raymond_B]

Are they talking about just making raw HP ?

If so run as much timing as you can with the boost you have and if that's not good enough throw more boost at it and run as much timing as you can again



Maybe that's why my truck is apart

 

[Lightning Struck]

Well maybe Raymond can help me out here..

Running more boost gets more air in,and increases cylinder pressure...That's good...

Timing increases cylinder pressure, does nothing for air..that's good and bad...

boost+timing increases air and cylinder pressure more..that's good till it goes POP...

I would run more boost, lower timing, creep back up on timing until it detonates, get out of the throttle, reduce the timing alittle bit more, then see what it MPH's in the 1/4... If the MPH is higher, you know it upped the HP..

Peak HP is on the threshold of detonation...Because that's when the combustion process is the most efficient...But if you fall off that razor's edge, hehe...You'll get good at pullin heads(LIKE JEFF!!!)

 

[gasguzzler]

It sounds like they are talking overall horsepower and quartermile times. One of the guys is pushing 10 lbs. of boost and 24* total timing and putting up good numbers. Right now I'm pushing 7lbs. and running as much timing as I can without detonation. Should I push it up to like 9 lbs. and take out that much more timing, leave it like it is, or reduce the boost and add timing? - Brian

 

[sstock]

I believe there is a point of diminishing returns here.
One thing you need to consider and has not been brought up is Fuel Octane. 6 to 7 pounds of boost is max on 94 Octane with the required acceptable ignition retard. I do not have first hand experience on the Kenne Bells but have researched it a bit and found that the KB makes a lot of heat when it compresses the air. And you get that heat(pressure) just past tip in if you have your foot into it. You start jacking up the pressure and you better find some good octane, never mind the ignition retard. You run 10lbs of boost on 94 Octane , the retard you would need to stop the rattle would make for a pretty lathagic combo. Just my .02
Leave the boost alone at 6lbs , when you get to the strip put on your 10lb pulley and run your 104 Octane and all is good.
I found out last week what some of the more senior members around here have been telling me for years and that is : it isn't how much boost you make, but how much airflow you can create.
Last week after my head install, I lost 2lbs of boost at shift- from 8 to 6lbs. But I picked up 44RWHP. See my point. Your engine will be able to run more timing, run cooler and last longer with good tune on the street with pump gas with lower boost(6lbs) and good heads.
Later
STeve

 

[Muddmann]

...and if you fill your garage with spaghetti, the cow may not jump over the moon after all

 

[gasguzzler]

...and if you fill your garage with spaghetti, the cow may not jump over the moon after all

... so that's why you blew a head gasket;t

 

[Raymond_B]

It seems to be they are comparing two different aspects. You simply can't ask the question "should I add more timing or more boost ?". The question that needs to be asked is how do I get the most gains from my combination.

Timing will be dependant on many things fuel quality, boost, air fuel ratio, intake air charge, etc.

Steve's right when you help the engine breath you will lose some boost (less restriction). Then you have to re-do your timing at that level.

It's all just a big Rubic's Cube

 

[Lightning Struck]

Really it's a rubic cube?? I have a guy in my English class that can do a Rubic cube in 2.5 minutes!! Maybe I should have him tune my Lightning!!!

 

[Raymond_B]

Does he say 5 mins to Wapner all the time ?