Stalling on boost in the rain - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

canadians14sr20det · 01-20-2015, 01:01 PM

Okay so I have a really weird problem:

Car is TOTALLY fine when it is dry or mildly raining.

If the car is totally soaked (as in driving in the rain for 30 mins or more), the car will stall when transitioning into boost. Like totally stall. Engine sputters and bucks, then dies and dash lights come on.

Air filter is protected and shrouded from water (welded up the previously open holes in front of the wheel well). I don't think the maf is ingesting a large amount of water.

Car drives fine on part throttle and cruising in the rain. Just boost in the rain.

Relevant Motor specs:
SR20DET
Z32 MAF
Wiring harness done by me, should be good, seems dry when car dies
profec B spec-II boost controller
power fc l-jetro
full race manifold, gt30, tial 44mm wastegate
water methanol injection from aem kit

bmaddock · 01-20-2015, 02:49 PM

Could be moisture collecting at the coilpacks? Maybe you have small cracks that create more noticeable shorts when under load (boost) and enough moisture is present.

g14novak · 01-20-2015, 04:10 PM

Maybe blowing out spark when going into boost with moisture in the air because of bad plug gapping.

joe3180 · 01-20-2015, 11:27 PM

still got the weather striping where the hood and the firewall meet?

canadians14sr20det · 03-02-2015, 12:05 PM

Bringing a thread back from the dead!

I fixed this. g14novak was right, water was blowing out the spark, but it was the combination of rain (moisture in the air) and my water methanol. I was using the largest jet which worked great in the usually dry climate I live in, but when the humidity and mist from the rain was high enough there was simply too much water in the intake charge.

I fixed this by disabling the meth in the rain. I've yet to figure out a better solution that senses water content in the intake charge and drop meth injection. I'll update this if I figure out a better way of solving this problem other than disabling the water meth.

01-20-2015, 01:01 PM	#1
canadians14sr20det Join Date: Oct 2011 Location: Canada Posts: 43 Trader Rating: (0) Feedback Score: 0 reviews	Stalling on boost in the rain Okay so I have a really weird problem: Car is TOTALLY fine when it is dry or mildly raining. If the car is totally soaked (as in driving in the rain for 30 mins or more), the car will stall when transitioning into boost. Like totally stall. Engine sputters and bucks, then dies and dash lights come on. Air filter is protected and shrouded from water (welded up the previously open holes in front of the wheel well). I don't think the maf is ingesting a large amount of water. Car drives fine on part throttle and cruising in the rain. Just boost in the rain. Relevant Motor specs: SR20DET Z32 MAF Wiring harness done by me, should be good, seems dry when car dies profec B spec-II boost controller power fc l-jetro full race manifold, gt30, tial 44mm wastegate water methanol injection from aem kit

01-20-2015, 02:49 PM	#2
bmaddock Zilvia Junkie Join Date: Sep 2011 Location: Richmond Posts: 506 Trader Rating: (1) Feedback Score: 1 reviews	Could be moisture collecting at the coilpacks? Maybe you have small cracks that create more noticeable shorts when under load (boost) and enough moisture is present. __________________

01-20-2015, 04:10 PM	#3
g14novak Zilvia Member Join Date: Aug 2009 Location: FL! Posts: 168 Trader Rating: (1) Feedback Score: 1 reviews	Maybe blowing out spark when going into boost with moisture in the air because of bad plug gapping.

01-20-2015, 11:27 PM	#4
joe3180 Zilvia Junkie Join Date: Aug 2005 Location: 909 california Posts: 356 Trader Rating: (11) Feedback Score: 11 reviews	still got the weather striping where the hood and the firewall meet?

03-02-2015, 12:05 PM	#5
canadians14sr20det Join Date: Oct 2011 Location: Canada Posts: 43 Trader Rating: (0) Feedback Score: 0 reviews	Bringing a thread back from the dead! I fixed this. g14novak was right, water was blowing out the spark, but it was the combination of rain (moisture in the air) and my water methanol. I was using the largest jet which worked great in the usually dry climate I live in, but when the humidity and mist from the rain was high enough there was simply too much water in the intake charge. I fixed this by disabling the meth in the rain. I've yet to figure out a better solution that senses water content in the intake charge and drop meth injection. I'll update this if I figure out a better way of solving this problem other than disabling the water meth.