Another S/C'd member worried about his AFR

[PETERPOOP]

They are saying there is possibly 20-30hp to gain with a tune.

[Loren]

Originally Posted by PETERPOOP

They are saying there is possibly 20-30hp to gain with a tune.

I'll believe that when I see it.

Let me qualify that. The bolt-on, out-of-the box Blitz SC kit with fully tuned and optimized fuel and spark. The initial installation is only good for about 25%, or 25-30 hp. No way is optimizing the fuel and spark going to DOUBLE that. You'll find another 3-8%... maybe as much as 10% or so, just like you would by tuning the car without the SC. That's the factory's margin of safety that you're playing with.

Now, you might see something close to that with a lot of OTHER additional mods, like a complete free-flowing intake, larger TB, better flowing intake manifold, some head work, a good header and a complete free-flowing exhaust. But, that's an awful lot of other stuff that doesn't really fall into the category of "fuel and spark tuning". And, even with all of that, I still don't think you're going to DOUBLE the output of the SC without raising the level of boost.

[kurokoma-kun]

Originally Posted by Loren

I still don't think you're going to DOUBLE the output of the SC without raising the level of boost.

Ok, well I do like what Loren said about leaving sleeping superchargers lie, as I said the same thing a few pages back

BUT, since he raised the topic of added boost, and mad science also appeals to me (and we have already strayed so far from the original topic) I'd appreciate it if you'd all give opinions on my theoretical question... NST is considering developing a set of pullies for the s/c application (overdrive crank and underdrive water pump, the only configuration that will fit in the given space). Mike estimates the combination of the two could produce an additional 2 psi of boost, or up to 20 whp. The way I understand it, boost works on a geometric progression--you get more power out of those last 2 psi than the first 2 in other words--so these pullies could nearly double the hp ouput.

I expressed interest in letting my car be the guinea pig--nothing difficult about changing out some pullies--but no one can say for sure whether the fuel system can keep up, and for all the reasons mentioned I hesitate to tackle a fuel system revamp...

Based on what you have all derived from this discussion, what are your opinions? Could I at least go ahead and be the test mule without too much danger to the engine?

I think we decided the fuel injectors are max 230cc, max fuel pressure at the rail is 46.9 psi, but even with these figures I'll be damned if I can find any way to calculate the max hp for sure.

[largeorangefont]

Originally Posted by Loren

I'll believe that when I see it.

Let me qualify that. The bolt-on, out-of-the box Blitz SC kit with fully tuned and optimized fuel and spark. The initial installation is only good for about 25%, or 25-30 hp. No way is optimizing the fuel and spark going to DOUBLE that. You'll find another 3-8%... maybe as much as 10% or so, just like you would by tuning the car without the SC. That's the factory's margin of safety that you're playing with.

Now, you might see something close to that with a lot of OTHER additional mods, like a complete free-flowing intake, larger TB, better flowing intake manifold, some head work, a good header and a complete free-flowing exhaust. But, that's an awful lot of other stuff that doesn't really fall into the category of "fuel and spark tuning". And, even with all of that, I still don't think you're going to DOUBLE the output of the SC without raising the level of boost.

I'd say we could get 10% under the curve easily, probably slightly more. Peak piwer increase I would expect 8-10%. You make more power with timing than you do with boost. LtNoogie is seeing single digit ignition advance under load. If we could get that up to where is should be, and add some fue,l the gains would be there. There is a lot of potential.