SR20 gt2871r losing power at full boost - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Jersthecool · 07-08-2012, 06:06 PM

So after a couple days of breaking back in my engine I decide to do a nice pull and see what happens. Turbo starts to spool and I get full boost at say 3800 and it pulls hard until about 5k and then it suddenly loses it's pull and keeps revving up while not pulling and the turbo is still at full boost according to boost gauge. I put fresh bk7re's in with a gap of .30 and decided to open the gap to .35 because that's what they were when I pulled the old ones and I took it for a rip and it pulled hard until I shifted at 7k, so I thought it wasn't getting enough spark before so problem solved right? Nope!

Take it out for a spin today and the same thing happens pulls hard and at about 5-5500 it loses it's power. Anyone know what's going on and what I should do?

ForeignMuscle · 07-08-2012, 06:14 PM

Sounds like a boost leak. Might just be inconsistent.

Jersthecool · 07-08-2012, 06:32 PM

Hmm where should I check for a leak?

*fliprayzin240sx* · 07-08-2012, 06:55 PM

What wastegate are you using? Exhaust pressure might be overpowering the internal wastegate's tension on the flapper. Seen it happen a couple of times.

Jersthecool · 07-08-2012, 07:11 PM

Using a stock 12lb internal. Never had a problem before I pulled the engine now it's doing this. Only difference I believe is I'm running richer then before (big backfires all the time)

ForeignMuscle · 07-08-2012, 07:58 PM

Really sounds like a boost leak. Check all couplers and lines. If you can't find it then buy the leak down test kit from siliconeintakes.com It's not very expensive. Sometimes the leak wont be present until the engine heats up and couplers expand.

jedi03 · 07-08-2012, 08:39 PM

wat maf and injectors are you using?

Jersthecool · 07-09-2012, 01:28 AM

Yeah it's weird it spools and starts to pull then as soon as I actually get full boost at like 3500 it stops pulling hard until about 5500 then my boost is instantly back and stays until redline.

I'm using a z32 maf and 550cc wrx sti injectors.

07-08-2012, 06:06 PM	#1
Jersthecool Zilvia Junkie Join Date: Jul 2010 Location: Calgary, Canada Posts: 308 Trader Rating: (0) Feedback Score: 0 reviews	SR20 gt2871r losing power at full boost So after a couple days of breaking back in my engine I decide to do a nice pull and see what happens. Turbo starts to spool and I get full boost at say 3800 and it pulls hard until about 5k and then it suddenly loses it's pull and keeps revving up while not pulling and the turbo is still at full boost according to boost gauge. I put fresh bk7re's in with a gap of .30 and decided to open the gap to .35 because that's what they were when I pulled the old ones and I took it for a rip and it pulled hard until I shifted at 7k, so I thought it wasn't getting enough spark before so problem solved right? Nope! Take it out for a spin today and the same thing happens pulls hard and at about 5-5500 it loses it's power. Anyone know what's going on and what I should do?

07-08-2012, 06:55 PM	#4
fliprayzin240sx I </3 VA Join Date: Aug 2002 Location: Ass Crack of Hamptin Vagina Posts: 15,882 Trader Rating: (17) Rides Gallery: fliprayzin240sx Feedback Score: 17 reviews	What wastegate are you using? Exhaust pressure might be overpowering the internal wastegate's tension on the flapper. Seen it happen a couple of times. __________________ If you think Zilvia has too many assholes... CLICK HERE!!! FS: Topline Aragosta Coilover, Zenki Sideskirts/Valence and Tial V44 gate

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07-08-2012, 06:14 PM	#2
ForeignMuscle In time-out for misbehaving. Join Date: Feb 2012 Location: waiting at the finish line.. Posts: 828 Trader Rating: (16) Feedback Score: 16 reviews	Sounds like a boost leak. Might just be inconsistent.

07-08-2012, 06:32 PM	#3
Jersthecool Zilvia Junkie Join Date: Jul 2010 Location: Calgary, Canada Posts: 308 Trader Rating: (0) Feedback Score: 0 reviews	Hmm where should I check for a leak?

07-08-2012, 07:11 PM	#5
Jersthecool Zilvia Junkie Join Date: Jul 2010 Location: Calgary, Canada Posts: 308 Trader Rating: (0) Feedback Score: 0 reviews	Using a stock 12lb internal. Never had a problem before I pulled the engine now it's doing this. Only difference I believe is I'm running richer then before (big backfires all the time)

07-08-2012, 07:58 PM	#6
ForeignMuscle In time-out for misbehaving. Join Date: Feb 2012 Location: waiting at the finish line.. Posts: 828 Trader Rating: (16) Feedback Score: 16 reviews	Really sounds like a boost leak. Check all couplers and lines. If you can't find it then buy the leak down test kit from siliconeintakes.com It's not very expensive. Sometimes the leak wont be present until the engine heats up and couplers expand.

07-08-2012, 08:39 PM	#7
jedi03 Leaky Injector Join Date: Jul 2008 Location: albuquerque Posts: 143 Trader Rating: (4) Feedback Score: 4 reviews	wat maf and injectors are you using?

07-09-2012, 01:28 AM	#8
Jersthecool Zilvia Junkie Join Date: Jul 2010 Location: Calgary, Canada Posts: 308 Trader Rating: (0) Feedback Score: 0 reviews	Yeah it's weird it spools and starts to pull then as soon as I actually get full boost at like 3500 it stops pulling hard until about 5500 then my boost is instantly back and stays until redline. I'm using a z32 maf and 550cc wrx sti injectors.

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