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Old 11-09-2016, 08:18 PM   #1
jblocka
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Default How to know when to switch nozzles,methanol

Vehicle: 06 sti with vc-50 MAP controller and snow performance safe injection unit with pump and bypass valve

Hello, I have been battling an issue with my safe injection unit putting me down to wastegate pressure. After talking with snow performance it seems my injection unit itself is not calibrated to the right "flow" setting for my horsepower.

My question is, once I swap to the 375 nozzle and adjust the unit to the correct flow setting would my tune then need to be adjusted?

Would there be a benefit to that adjustment in the tune?

I'm currently bypassing the 3 port solenoid so I'm not at WG pressure. Does anyone see an issue with that other than not having the safety net?

Lastly how is the methanol kit even knowing I'm not at the correct hp levels for my nozzle? Is it the manifold pressure?

I know it's a lot but I appreciate you're time for trying to help thanks!
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Old 11-14-2016, 09:16 AM   #2
point78
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Typically you use how much hp & boost you have & calculate the volume of water/meth you need. Next you pick the jet to get you close, then you free air flow tests& adjust pump pressure to get that volume.

Then you have your car tuned to something like 11.0 AFR on its normal tune. Next do a few pulls with the water spraying-your looking for a drop in afr's, something like 10.0 while spraying. Bigger drop means to much water, smaller drop means not enough. Adjust jet/pump pressure & repeat.

After you get the 1 to 3/4 pt AFR drop, you then pull fuel to get get back to 11.0 AFR, or whatever you want it to be. 11, 11.5, etc. then you start adding timing & or more boost if you want.
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Old 11-14-2016, 05:24 PM   #3
jblocka
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Thanks for that info
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Old 09-23-2018, 12:20 AM   #4
PDXREALTOR
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Quote:
Originally Posted by point78 View Post
Typically you use how much hp & boost you have & calculate the volume of water/meth you need. Next you pick the jet to get you close, then you free air flow tests& adjust pump pressure to get that volume.

Then you have your car tuned to something like 11.0 AFR on its normal tune. Next do a few pulls with the water spraying-your looking for a drop in afr's, something like 10.0 while spraying. Bigger drop means to much water, smaller drop means not enough. Adjust jet/pump pressure & repeat.

After you get the 1 to 3/4 pt AFR drop, you then pull fuel to get get back to 11.0 AFR, or whatever you want it to be. 11, 11.5, etc. then you start adding timing & or more boost if you want.
How much of this strategy changes when using a 70/30 water/meth mix?

I started with a nozzle that got me a .4 AFR drop, then put in a larger nozzle for a .8 AFR drop.

Keeping both AFRs on the WBO2 @ 11.00 (so true gas afr of 11.4 and 11.8) has me loosing 20 HP per .4 AFR drop.

I'm also running just over 100 octane so.... I'm wondering what direction I should take this.
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Old 09-26-2018, 03:38 PM   #5
pcampbell
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With 100 octane and water meth, why not lean out your gasoline so you are seeing 11.5 on your wideband?

Last edited by pcampbell; 09-26-2018 at 03:53 PM.
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Old 09-28-2018, 12:35 AM   #6
PDXREALTOR
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34 psi.

I put the smaller nozzle in and got a touch of knock at 11.8 true afr (11.4 WBO2) with almost zero power gain.

Dropped it back to 11.4 true afr and bumped timing up 2 degrees.

Zero knock, 480 whp/500 tq with awesome spool.
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Old 10-26-2018, 06:40 AM   #7
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Nice.
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Old 10-30-2018, 06:20 PM   #8
CarmelValleyWRX
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if your car is tuned for the nozzle in there then why not leave it alone and calibrate your controller? adding more water mix will just drop your power unless you get it retuned for the higher flow rate.
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Old 10-31-2018, 10:17 AM   #9
pcampbell
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Default How to know when to switch nozzles,methanol

Was the decrease in AFR purely water/meth flow or did you increase gasoline too?
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Old 10-31-2018, 11:06 AM   #10
PDXREALTOR
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Quote:
Originally Posted by CarmelValleyWRX View Post
if your car is tuned for the nozzle in there then why not leave it alone and calibrate your controller? adding more water mix will just drop your power unless you get it retuned for the higher flow rate.
The only tuning I can do on the meth system is the flow *on* rate. It's a snow stage one kit.

I tune my car. There was no recovering the amount of power lost by doubling the flow of meth. Even if I could recover the power the timing and afr would need to be so dangerous if the meth failed it wouldn't be worth it.

Keep in mind I run over 100 octane so the meth is just a cooling method more than a power adder. Being able to add 2* of timing is just a nice bonus.
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Old 10-31-2018, 11:11 AM   #11
PDXREALTOR
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Quote:
Originally Posted by pcampbell View Post
Was the decrease in AFR purely water/meth flow or did you increase gasoline too?
I ended up increasing commanded fuel by the same amount the wb02 was showing it decreased. In my case, 0.40.
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