RB20 in a Silvia: RPM's Drop When Brake Applied - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

dbiz · 05-08-2012, 09:20 PM

i literally just had a 240 delivered to my house with an rb20, and it idles at 1.8k before warmup.. i was told thats normal?? lmao anyway when i apply the brake (clutch in or in neutral), i hear a loud ass leak-like noise, just sounds like air pouring out or some shit, and the rpm's just start to drop. previous owner told me to just tap the gas once or twice to keep it up. i havent really checked it out or tried to find out what it is yet. any ideas what it could be??

Yellow4g63 · 05-08-2012, 09:25 PM

LOL sounds like you have a huge vacuum leak. They prob turned up the idle to try and keep it running. My rb20 idles at 1200 for a short period but that's because I have big cams. Hope you didn't buy the car without getting it checked out 1st by someone who knows wtf is going on.

dbiz · 05-08-2012, 09:40 PM

Quote:

Originally Posted by Yellow4g63

LOL sounds like you have a huge vacuum leak. They prob turned up the idle to try and keep it running. My rb20 idles at 1200 for a short period but that's because I have big cams. Hope you didn't buy the car without getting it checked out 1st by someone who knows wtf is going on.

according to the previous owner he cleaned the iacv and it didnt do jack. and yes i am guessing your correct. will update tomorrow lmao

Yellow4g63 · 05-08-2012, 10:27 PM

Not looking too good man. People lie all the time, it could have been a hack job too.

Frank_Jaeger · 05-09-2012, 05:26 PM

Check brake booster check valve, and all vacuum lines.

Perfect Balance · 05-09-2012, 05:44 PM

I would definitely check the brake booster, especially since pressing the brake makes noise like you describe.

Hellother · 05-11-2012, 04:29 PM

Quote:

Originally Posted by Frank_Jaeger

Check brake booster check valve, and all vacuum lines.

This........^^

TougeSR20Kid · 05-13-2012, 06:26 PM

Most likely brake booster... Do you have normal pedal feel the first time u press on the pedal after the engine is off? Also how does it feel when the engine is on? Hard or normal? Good news is if it's what I think it is, it's not too bad

05-08-2012, 09:20 PM	#1
dbiz Leaky Injector Join Date: May 2011 Location: Chicago, IL Posts: 91 Trader Rating: (1) Feedback Score: 1 reviews	RB20 in a Silvia: RPM's Drop When Brake Applied i literally just had a 240 delivered to my house with an rb20, and it idles at 1.8k before warmup.. i was told thats normal?? lmao anyway when i apply the brake (clutch in or in neutral), i hear a loud ass leak-like noise, just sounds like air pouring out or some shit, and the rpm's just start to drop. previous owner told me to just tap the gas once or twice to keep it up. i havent really checked it out or tried to find out what it is yet. any ideas what it could be??

05-08-2012, 09:25 PM	#2
Yellow4g63 Zilvia FREAK! Join Date: Jan 2003 Location: Socal Posts: 1,454 Trader Rating: (5) Feedback Score: 5 reviews	LOL sounds like you have a huge vacuum leak. They prob turned up the idle to try and keep it running. My rb20 idles at 1200 for a short period but that's because I have big cams. Hope you didn't buy the car without getting it checked out 1st by someone who knows wtf is going on. __________________ 95 240sx RB20 415whp 91 Nx2000 VVL yo

05-08-2012, 10:27 PM	#4
Yellow4g63 Zilvia FREAK! Join Date: Jan 2003 Location: Socal Posts: 1,454 Trader Rating: (5) Feedback Score: 5 reviews	Not looking too good man. People lie all the time, it could have been a hack job too. __________________ 95 240sx RB20 415whp 91 Nx2000 VVL yo

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05-09-2012, 05:26 PM	#5
Frank_Jaeger Zilvia FREAK! Join Date: Jan 2012 Location: Port Charlotte, Florida Age: 33 Posts: 1,352 Trader Rating: (1) Feedback Score: 1 reviews	Check brake booster check valve, and all vacuum lines.

05-09-2012, 05:44 PM	#6
Perfect Balance Zilvia Junkie Join Date: Nov 2006 Location: Virginia Age: 34 Posts: 397 Trader Rating: (1) Feedback Score: 1 reviews	I would definitely check the brake booster, especially since pressing the brake makes noise like you describe.