ahl395's Build Log - Methanol Injected / P1X / 4500W sound system

[ahl395]

Washed it, and installed my NT555RII's Love the way they fit to the rim. Not stretched looking like my MPSS. New nozzles for the meth system on the way. Dropping down to 29GPH total.

Also, photos from the dyno.

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[Jay-rod427]

Yeah, I think with that much boost and timing 950 should be easily achievable.

I believe I found the culprit. Doing some more research and talking to some people more knowledgeable than me, my assumptions about pressure are correct. 60psi meth pressure is NOT enough to properly atomize and spray it.

My meth is working but it's probably just about dribbling out of the nozzles rather than spraying. It's not going to burn very well like this, and I think that's part of the problem. It also makes the resolution of control and my failsafe much smaller, which I noticed when tuning it.

ProMeth severely oversized the nozzles. Double checking their math with other nozzle calculations, its almost 2X too much nozzle. Most calculatiors put me between 24-28GPH. NOT 50. Waiting to hear back from them because I am not a happy camper. A new set of nozzles is $250 and I don't feel I should have to pay for their incorrect calculation. We shall see.

UPDATE: Great customer service. While he tried to convince me otherwise and said he's never heard of not needing 50gph on 900whp+ setup, he is swapping the nozzles out for free. Apparently coyotes just work different and don't need a ton of meth for no reason?

That 60 psi isn't even accurate. That's the line pressure, the working pressure is less than 40. Have to offset the boost pressure on the other side of the nozzle. Just like injectors 70 psi line pressure minus boost pressure is only 50 lbs working pressure on 20 lbs.

 

[ahl395]

That 60 psi isn't even accurate. That's the line pressure, the working pressure is less than 40. Have to offset the boost pressure on the other side of the nozzle. Just like injectors 70 psi line pressure minus boost pressure is only 50 lbs working pressure on 20 lbs.

Definitely true! I brought that up with them on the phone actually.

Dropping 21GPH off my volume should definitely let me push the duty cycle up and raise pressure by a good amount. Also may add a little bit more water to the mix and make it 70/30. Water will make a little more pressure than meth, reduce cost, and allow me to spray a little more.

Nozzles are set to be here Monday. New Dyno appointment scheduled for the following weekend.

 

[ahl395]

Chrome finish came off my Xlume GT badge again, plastidipped it red again.

 

[ahl395]

Swapped my nozzles. Went from 60psi to about 120psi meth pressure. Much better! It didn't make any more power, but at least I know I'm getting good atomization now.

Something interesting I found looking at my logs and dyno charts. It makes peak power at about 7600rpm. At 7600rpm it's only at about 16-17psi. From 7600-8k it rises to 21psi with no power gain, I think this is just where the 18 manifold stops flowing. My numbers look alot better when you consider only 16-17psi. I think I could gain something by putting on a smaller pulley and making peak boost at the manifold's peak. And therefor only revving to ~7600.

At this point I'm going to have the boost controller dial it back down in the upper RPMs and keep boost around 17. No reason to shove in another 4psi if it's not making more power

 

[Jay-rod427]

For sake of racing if you do at all and maximizing power usage you always want to shift well beyond peak power so the shift drop doesn't put the engine back well under peak power. Lot's of other variables but that's the jist of it.

So say peak power @7,600 shift at 8,000 so the next gear starts at 7,000. Otherwise if you shifted at 7,600 the next gear would start at much lower power at say 6,600 and have further to climb to get back to peak power. This is why the 10 spds excel so well they stay closer to peak power output.

 

[ahl395]

For sake of racing if you do at all and maximizing power usage you always want to shift well beyond peak power so the shift drop doesn't put the engine back well under peak power. Lot's of other variables but that's the jist of it.

So say peak power @7,600 shift at 8,000 so the next gear starts at 7,000. Otherwise if you shifted at 7,600 the next gear would start at much lower power at say 6,600 and have further to climb to get back to peak power. This is why the 10 spds excel so well they stay closer to peak power output.

Only on the street in Mexico lol. But makes sense, I've heard that before.

I'm gonna think over it. Might just leave it as is or might try it since a pulley isnt too expensive. Lund said the reason my numbers are alot lower than the other max effort P1X's I'm comparing to are because they're gen 3's with more compression and better heads. I noticed the 951whp P1X car revs to only 7500 though.

Overall I just need a D1X lol. But I have to take a few years off from spending money on this car and buy a house, so that's a future goal.

On another note, these tires are rocking my world. It's like a whole different car with these things on. Hooks at WOT in 2nd gear and I can even use way more of 1st than before.

 

[80FoxCoupe]

Swapped my nozzles. Went from 60psi to about 120psi meth pressure. Much better! It didn't make any more power, but at least I know I'm getting good atomization now.

Something interesting I found looking at my logs and dyno charts. It makes peak power at about 7600rpm. At 7600rpm it's only at about 16-17psi. From 7600-8k it rises to 21psi with no power gain, I think this is just where the 18 manifold stops flowing. My numbers look alot better when you consider only 16-17psi. I think I could gain something by putting on a smaller pulley and making peak boost at the manifold's peak. And therefor only revving to ~7600.

At this point I'm going to have the boost controller dial it back down in the upper RPMs and keep boost around 17. No reason to shove in another 4psi if it's not making more power

The 18 intake isnt the restriction here. PM sent.

 

[ahl395]

After looking over all my dyno graphs, comparing to others, talking to people, etc. I've finally accepted it's nothing to do with the manifold and I'm just out of blower. Didn't want to accept it at first lol. Had high hopes after comparing to 18 cars and raising my compression but overlooked the improved heads, etc.

Pretty sure I'm just at the cap of what the P1X is capable of on this motor. Right around rated blower RPM its around 16-17psi and after that it doesnt make anymore power even though boost keeps rising. So I'm going to put the wastegate back in action and drop it down to a healthy 17psi so I'm not shoving in more boost than necessary.

All that aside -

I did some testing running 70/30 instead of 80/20 and think it may work to my benefit. Was still reaching full timing advance, but fuel trims weren't swaying as much and it was staying in the high .7 lambda range instead of mid .7s. Also going to change out the kinked outlet hose coming off the blower like in Sheepdog's writeup. Any optimization of what I got won't hurt!

Ceramic coating scheduled for the end of August.

 

[ahl395]

Put a DW400 pump in. Intermittently in 1 or 2 logs, unrelated to the meth (one was before it was even turned on), the car went lean and STFT was adding. Lund said looked like I lost a fuel pump but then the next logs would be perfect again.

Decided not to play with fire and swapped it out lol. 2+ years of the stock pump on the voltage booster probably started messing with it. Shouldn't need to worry about that anymore.

 

[SolarFlare]

Mine did something like that. Wonder if one of mine died momentarily. Do you have a pic of the log doing it?

 

[SolarFlare]

1-2 shift spike to 1.00 on both banks.

 

[SolarFlare]

To be fair I was racing with a dead battery, dunno if that had something to do with it, volts never dipped when that happened. I don’t want to swap pumps unnecessarily. Pass after that was all good.

 

[ahl395]

Interesting. My log was just a single gear pull but it was consistently lean, not a spike.

Was quite scary to see and I was lucky my motor didnt go kaboom as that was ~12psi at around 1.0 lambda.

One other time after that with the meth on it wasn't as bad, but still abnormal. Went up to .80 lambda and STFT wasnt pulling like it usually does with the meth. Meth definitely helped save it there, but after that I said enough of this fuel pump and got the DW400.

 

[SolarFlare]

yikes!

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