So my car has m1 with 93 oct. tune. It’s a 5.3 gen3 with cam and head gear. Twin turbo. Plenty injector/pump. I don’t have maps and did not tune myself.

Tuned, The car made 580 with an air fuel of 11.6 and the Alkycontrol kit on setting 6 of 8. Meth turns on at about 4-5psi. The car felt awesome and smooth, couldn’t feel any meth turn on but your seeing the air temps drop like crazy.

My gauge was reading 14 so I went to the dyno to turn boost up some, turns out the car made 554 on 16psi With 15* timing from 4psi(3500rpm) to limiter. The air fuel was actually 10.0 entire time in boost. Instead of turning boost up, we slowly turned down the m1 until it was completely off! That pull with 0 meth was an air fuel of 11.8 and power was 657 on same 16psi. So the car picked up 100whp on just lowering the meth. I turned the meth back on at the lowest setting and car made 625 with a 10.9 air fuel and I left it there.

now I know because I have 15* timing going up my tq curve whole time, I do a lot of highway pulls and 11.8 without meth was still a tad lean, I had to run the meth. I guess my questions is, at what point is the meth a background safety or a crucial part of the tune? Is it “safe” to have that 10.0 air fuel from the added meth knowing the injector tune runs a 11.8 or should the end result tune with pump and meth still be an 11.4-6 air fuel?

i couldn’t turn more meth on without drastically richening the tune and dropping a ton of power. So I turned the boost up to 18 and turned Slightly more meth on (2.5) so it’s now a 11.1 going through a pull but much more power. Timing dropped to 14* on extra boost. No power number cause not on dyno for this. The nozzle was just too big for lower boost. When meth on it dropped air fuel crazy on lowest setting and car just to lean without it.

Ive read the air fuels need to be 1.3 lower with the meth turned on but it’s hard to know if that’s true because everything I find is pure meth car or no meth. What exactly should the air fuels read with the pump/m1 going through entire boost range, knowing car drops ton of power when it’s too rich?

because such a long post, figured I would put my newest draggy pull on the 18 😁

 

Meth is coming on too soon . You need some heat in the cylinder. My ls/ whipple car was the same . I switched to come on 8-9 lbs and it’s alot better. You also have to take some fuel out . It’s too rich with meth on , so take some fuel out till your afr leans out a little .

 

so my air fuel was 11.8 on 16psi with no meth... now I’m running 18psi On the same fuel map. it would be much leaner so the meth keeps it at 11.1 I’m assuming. also I’m running a lot of timing down low with the tq so wouldn’t the meth help? What’s the correct air fuel supposed to be?

 

What’s your afr down low with meth on?

 

3300 rpm-ish meth turns on (4-5psi) and air fuel goes from 12 to 11.5 than as power is climbing until about 5500rpms the air fuels stay around 11.5-10.9, at peak power (5500rpms) the graph starts to fall off and the air fuels flatline to 10.0

so now I am not exactly sure how exact the air fuels are at the 18psi but my wideband in car shows around high 10s to 11.1 and my timing says does 14* instead of 15*

 

Well if it’s 10.0 up top you either have to take some fuel , or meth out up top . I would think fuel . I would go back to tuner ,or find a tuner that has tuned a lot of cars on meth . Did you try turning meth down a little ? Is it progressive? Or on/ off? Not really sure what the afr should be @ 18 lbs on a turbo car .Need to find that out first . Mines around 11.0 on 14-15

 

I wouldn't run 11.8 on 93 at 18 psi unless your compression or timing is in the dirt. I'd shoot for low 11s and turn the meth down if you're not going to rely on it for added fueling and just want the cooling.

 

so it was at 11.8 on pump only at 16psi... With meth on setting 1 it was at 10.9, so I turned the boost up to 18 AND turned the meth to setting 2.5, so at this point I am 100% needing the meth because I cannot edit the fuel table. If it was too lean on 16psi on pump than on 18 the meth is only thing keeping it alive.

right now on 18 the air fuels are around 10.9-11.1 with methanol. Should I turn meth up alittle more or leave it at this A/F?

 

I would be inclined to leave it, but you need to read the plugs to confirm. What's your timing at peak torque and peak rpm?

 

it’s at 14* on the 18psi

was at 15* on the 16psi

the meth sprays at 3300rpms at 4-5psi so meth is there entire time

 

Guessing your 5.3 is relatively low compression so that looks ok. Check plugs to confirm.

 

it’s bottom end bored .020 over with stock gen3 rods with arp bolts. 706 heads with ls9 gaskets. Pistons are just off the shelf no name I was told.

compression test was 160psi before the tune.

 

The tune is the issue. Can't have your cake and eat it too! It's not going to run well without a tune dedicated to the methanol. If its going to be a meth car, and you want the power... tune it for the meth. The meth isn't coming on too soon if the engine isn't drowning. You want the meth all in quick to keep the cylinders/pistons cool before detonation or problems set in. You just need to tune the engine accordingly. If you want the most out of the kit, turn the kit all the way up and pull fuel from the tune until the power falls inline.Your peak power AFR window does open up a ways with meth. So you can target a richer AFR than you could with pump alone. I believe Julio suggests 10.8 at 20-30% of the total fueling being replaced (It's been a LONG time, may want to verify). But it depends how much of your total fueling your providing with methanol. Most kits won't flow more than 25-30gph at higher pressures. 40gph or so around 100psi. General rule is 10gph supplements about 65hp. So around 200hp of supplemental fuel for most decent pumps.Dont' focus on intake temps that means diddly. You want as much meth in the cylinder as possible for the biggest gain and best octane/anti knock.

Really an aftermarket ecu would be the way to go. Look into the Holley terminator at $800. Be cheaper than the dyno runs and paying someone else to alter the ecu all he time. MS3 is even better IMO but 1040 + software. Things like boost by speed are game changers for a highway setup.

 

I setup my tune so I'm low 11's no meth, and high 10's with meth. Meth kicks in around 5-8 psi. Single M10 nozzle. No bog no nothing. I am running WWF not straight M1 to be fair though.

 

How are you peaking at 5500rpm? Must be falling off pretty hard after that to go that rich.

What's the full setup again?

 

5.3
btr springs/pushrods
btr stage2 cam
twin cxracing gt35s T4
80 dekas
92 tb
2.5 bar map


im full boost before 5500rpm but it’s creeps boost up to 5500. This was dyno before I fixed the boost controller and put new plugs. So only point of this was to show the creep of boost