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Old 11-09-2016, 09:18 PM   #1
jblocka
Scooby Newbie
 
Member#: 414762
Join Date: Feb 2015
Chapter/Region: MAIC
Location: Dover, De
Vehicle:
06 Wrx sti
Blllllack

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, 10:16 AM   #2
point78
Scooby Specialist
 
Member#: 344329
Join Date: Jan 2013
Location: Summit County
Vehicle:
2008 Wrx, 6mt

Default

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, 06:24 PM   #3
jblocka
Scooby Newbie
 
Member#: 414762
Join Date: Feb 2015
Chapter/Region: MAIC
Location: Dover, De
Vehicle:
06 Wrx sti
Blllllack

Default

Thanks for that info
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