Let's also recall what T.Lewis said in his post on 8/31:
"...The Pulstar engineer we are talking with said they expect 3-5% gains.
Assuming any number you want for starting rwhp, say, 350 rwhp.
-------3% is 10.5 rwhp increase.
-------5% is 17.5 rwhp increase.
Per the Pulstar engineer, they are ALREADY BELOW THEIR 29 RWHP CLAIM!!!!!
That's a 40% reduction ALREADY!~!!!
What did I miss?
I don't believe Pulstar officially claimed the 29hp. They did dyno runs on nmcoyotes car that showed a 29 hp gain and nmcoyote posted the numbers here.
I don't believe Pulstar officially claimed the 29hp. They did dyno runs on nmcoyotes car that showed a 29 hp gain and nmcoyote posted the numbers here.
It's called plausible deniability.
You are correct, my mistake. But then again, who is nmcoyote? And if s/he's claiming 29 rwhp gain, isn't it totally inconsistent with T.Lewis's conversation with Pulstar's "engineer" and his stated expectation of 3%-5% gain? It is to me.
But you've pointed out a valuable piece of info, thanks!
There is some rough country around there. You can just vanish into the high desert if you know too much.
It's not nice to mess with Mr. Pulstar. Our Forum members have either "gone native" or are now "resting at peace" in the high desert after witnessing the dyno results.
He's just "composing himself" for the big expose on Pulstar plugs. He's in awe of the magnificent horsepower gains made with only a simple, piece of ceramic and metal, all 8 of them, added to his magnificent (oops, I said that already) steed.
All the extra ponies found is befuddling the hands that are to reach the keyboard and post to us the final, definitive results of gains made.
A waiting audience, continues to .... wait..... impatiently....
OK, OK. We spent all day on the dyno, playing with the plugs and tuning changes. Bottom line first, we saw no gains in horsepower or torque. That's not to say we won't, just may require more tuning to use the differences in combustion we saw with these plugs.
We most assuredly saw that the plugs made a difference!
First, on an in-car wideband with stock plugs it was tuned for a flat 13:1 A/F. With no changes in tuning, just install the pulstars, the A/F went to a flat 13.2:1. Why did it go leaner? Best guess and feeling of the Pulstar team is that we were getting more complete combustion, giving less residual O2 in the exhaust. This is what the Pulstar plugs were designed to give, and probably better gas mileage. Any WOT horsepower gains would be a bonus.
The second thing we saw was increased knock retard. Why is a little more complicated. I'll try my best on this one. When you increase the voltage of the spark you get faster ionization of the air in the gap, and get a spark sooner than with lower voltage. A faster spark ignites the mixture sooner and is just the same as adding timing, so for this finely tuned motor, with as much advance as it wanted, now we had too much.
Long story short, with tuning on the A/F, and adjusting the plug gap (60 thousands Vs. 40 stock) we got it back to very little KR, and a flat 13:1 A/F and the same HP and TQ curves as we came in with.
Why the big gain on nmcoyote and no gain here? Best answer I can give is nmcoyote was stock, this was a heavily massaged and tuned vehicle. When you add these plugs you will end up a little leaner and with more spark advance, just what a tuner does to gain power. This vehicle came in with the A/F and advance curve already optimized, so no gain in HP, but time will tell if it gets better mileage.
Sorry if a stepped on Vettepartz toes, he'll post up charts and all gory details.
__________________
Porsches for breakfast
Ferraris for lunch
OK, OK. We spent all day on the dyno, playing with the plugs and tuning changes. Bottom line first, we saw no gains in horsepower or torque. That's not to say we won't, just may require more tuning to use the differences in combustion we saw with these plugs.
We most assuredly saw that the plugs made a difference!
First, on an in-car wideband with stock plugs it was tuned for a flat 13:1 A/F. With no changes in tuning, just install the pulstars, the A/F went to a flat 13.2:1. Why did it go leaner? Best guess and feeling of the Pulstar team is that we were getting more complete combustion, giving less residual O2 in the exhaust. This is what the Pulstar plugs were designed to give, and probably better gas mileage. Any WOT horsepower gains would be a bonus.
The second thing we saw was increased knock retard. Why is a little more complicated. I'll try my best on this one. When you increase the voltage of the spark you get faster ionization of the air in the gap, and get a spark sooner than with lower voltage. A faster spark ignites the mixture sooner and is just the same as adding timing, so for this finely tuned motor, with as much advance as it wanted, now we had too much.
Long story short, with tuning on the A/F, and adjusting the plug gap (60 thousands Vs. 40 stock) we got it back to very little KR, and a flat 13:1 A/F and the same HP and TQ curves as we came in with.
Why the big gain on nmcoyote and no gain here? Best answer I can give is nmcoyote was stock, this was a heavily massaged and tuned vehicle. When you add these plugs you will end up a little leaner and with more spark advance, just what a tuner does to gain power. This vehicle came in with the A/F and advance curve already optimized, so no gain in HP, but time will tell if it gets better mileage.
Sorry if a stepped on Vettepartz toes, he'll post up charts and all gory details.
thank you for your integrity!! my guess was right .00 i finally won a poll
Well if they TUNED the car... theres where your 29 horsepower came from, I dont get why anyone in their right mind would claim spark plugs increase horsepower unless the plugs you currently have are fouling up
Corvette Store
impatiently....
