how much HP @ WOT assuming you are not running into detonation?

I am running 16* @ WOT with 93 octane and at 17* there is a slight amount of audible ping. I'm looking at running alcohol injection, and at 15-16lbs boost, I am thinking I can go up to 22* at the same level of boost. I've seen Jody's posts, and I believe he was running 20* with 91 octane and a couple pounds more boost.

Is 5HP per pound of boost realistic, or is it less HP per pound?

Thanks.

 

Thats sounds about right. Maybe a little low. I've allways heard the rule of thumb is 7hp per psi as long as the air charge/ density/ temp are the same. As far as timing goes it really depends on each L. They seems to react so different to timing on a case buy case baisis.

 

Jim Bell says 11-13 Hp for 1 pound boost and 4 Hp for one degree timing.
Each pound of boost requires 1.5 more octane.
For each 3 degrees of time requires 1.5 more octane.
Mat Snow says the water/methanol injection is 120 octane.

Seems to work that way for me.

NoSurprise

 

HI!... Well I'm running 28 degree's of timing on a N/A engine running on SUNOCO 94 octane. No pinging here, no detonation here. Makes over 340H.P (flywheel). Been running like that for over 4 years. No problems here.

 

Interesting topic. How are you guys checking your timing? I've heard you can use the Predator? I have one. I checked the user's manual. It doesn't say anything about it??

 

Neal: being naturally aspirated, you don't count. Sorry.

fast1: Under the "diagnostic" mode, then you go to "real time data" and pick either "show all" which shows several things at once, or you can pick "select from a list" and you will find the timing option which is either spark or ignition (I can't remember exactly what they call it, but they don't use the word timing). Then go out and hit WOT and see where it is. Just be careful not to look at the Predator more than you're looking where you're going.

 

Thats a funny question.....I just picked up this months MM&FF and they have a blower test in there on an '03 Cobra motor.

To make a long story short when they went from 11 to 14 lbs boost on the stock Eaton blower the engine picked up 11 hp and when they went from 11 to 13.6 lbs boost on the turbo setup it picked up around 80 hp So I guess it depends.
Dale

 

Correct!!!...Basically, there isn't a "Rule of Thumb"....

 

I was asking what the general concensus is on a L motor with around 400 RWHP with the Eaton, if each degree of timing was approx 5 HP (or more)?

I've seen an article of a turbo motor that was under 500 FWHP naturally aspirated, and with less than 14 lbs boost made just over 1000 FWHP.

I'm asking about timing on our trucks with the typical bolt ons required to get to 400-425 RWPH. If we start talking about other combos, turbos and different motors, it would be a different thread. Thanks.

 

Hmmm...the last line in your first post is asking about boost I guess I'm confuesed

 

You are right. I just think that comments on turbo combinations on some other motor was kinda irrelevant. I was asking for trucks with superchargers, such as Lightnings with Eaton blowers, but I guess if I don't specify, I'll get all kinds of non-Lightning related answers. I guess I'm gonna be sorry for throwing that the question about boost and HP increase. I'm really more concerned about timing.