T25 on KA-T making noise and not reaching full boost! Help! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

ShimiBoi · 05-27-2013, 01:43 AM

Hello all,

First off, thank you all for your help in advance. So I just turbo'd my KA with SR piping and a T25. I recently replaced the hose going to the wastegate from the intake piping (between the IC and TB) with a much longer hose that is about a foot longer to accommodate a MBC. However, I decided not to connect it but left the hose long. Now I have noticed that there is a weird noise coming from the turbo under boost and a whistle when slowing down in neutral, which never used to happen. Motor slightly bogs down then idles at 700rpm (normal was 900rpm). AFR is still mid 15s at idle. Boost gauge needle shakes between 6 - 7psi in 3rd gear at WOT. Turbo no good? Wastegate opening? Sorry for the long post. Please help.

cotbu · 05-27-2013, 09:12 AM

.................Lame

ShimiBoi · 05-27-2013, 03:27 PM

Anyone? Please help.

ShimiBoi · 05-27-2013, 03:29 PM

I meant I didn't use the MBC but the vacuum line is still connected to the WG. I'll check for oil in the pipes now.

***FaLKoN240*** · 05-27-2013, 03:34 PM

Check for a boost leak?

ShimiBoi · 05-27-2013, 11:45 PM

Couldn't find any boost leaks. But I did notice that there is a loud rattling noise at 3000rpm in all gears. I'm fearing that the turbo is making the noise. But I'll look more into it tomorrow. Boosting seems to be fine. No metal know the intake piping before the IC. Not sure what is causing the rattle.

Sileighty_85 · 05-27-2013, 11:50 PM

check for shaft play on the turbo.

jr_ss · 05-28-2013, 05:32 AM

7psi is max psi on just wastegate spring pressure. Post a video of the rattle.

ShimiBoi · 05-28-2013, 08:36 AM

I know there was some shaft play when I installed it a few weeks ago, but not that bad. I hope it is just something rubbing other than the compressor wheel.

ShimiBoi · 05-30-2013, 12:07 PM

So it turned out to be the downpipe bolts backing out. Thanks everyone for the help.
Anyone know what a good base timing is on a ka-t running an Enthalpy tune is?

Duncan Steele · 06-01-2013, 10:45 PM

Should have just gone SR...

Duncan Steele · 06-02-2013, 08:55 AM

Also did you upgrade the injectors? Adding boost is going to make the car run leaner, so your engine might blow cause it's running to lean.

*!Zar!* · 06-02-2013, 09:24 AM

Sounds like you have a boost leak between the maf and the turbo.

motteramm · 06-03-2013, 02:00 PM

Quote:

Originally Posted by ShimiBoi

So it turned out to be the downpipe bolts backing out. Thanks everyone for the help.
Anyone know what a good base timing is on a ka-t running an Enthalpy tune is?

Set your timing back to normal. The timing on any Rom tune (or any tuned ecu) is done in the ecu itself. You don't have to change timing at the distributor or anything.

05-27-2013, 01:43 AM	#1
ShimiBoi Zilvia Member Join Date: Feb 2009 Location: Hawthorne Posts: 216 Trader Rating: (9) Feedback Score: 9 reviews	T25 on KA-T making noise and not reaching full boost! Help! Hello all, First off, thank you all for your help in advance. So I just turbo'd my KA with SR piping and a T25. I recently replaced the hose going to the wastegate from the intake piping (between the IC and TB) with a much longer hose that is about a foot longer to accommodate a MBC. However, I decided not to connect it but left the hose long. Now I have noticed that there is a weird noise coming from the turbo under boost and a whistle when slowing down in neutral, which never used to happen. Motor slightly bogs down then idles at 700rpm (normal was 900rpm). AFR is still mid 15s at idle. Boost gauge needle shakes between 6 - 7psi in 3rd gear at WOT. Turbo no good? Wastegate opening? Sorry for the long post. Please help.

05-27-2013, 09:12 AM	#2
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 47 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	.................Lame __________________ LoverTechnologies "Half Broken Things!" Last edited by cotbu; 05-27-2013 at 03:29 PM..

05-27-2013, 11:50 PM	#7
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	check for shaft play on the turbo. __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

05-28-2013, 05:32 AM	#8
jr_ss Post Whore! Join Date: Dec 2005 Location: Pa Posts: 6,056 Trader Rating: (34) Feedback Score: 34 reviews	7psi is max psi on just wastegate spring pressure. Post a video of the rattle. __________________ My SR20VET

06-01-2013, 10:45 PM	#11
Duncan Steele Join Date: Jan 2011 Location: New Caledonia Age: 31 Posts: 34 Trader Rating: (1) Feedback Score: 1 reviews	Should have just gone SR... __________________ 1f y0u c4n r34d th15, y0u r34lly n33d t0 g37 l41d.

05-27-2013, 03:27 PM	#3
ShimiBoi Zilvia Member Join Date: Feb 2009 Location: Hawthorne Posts: 216 Trader Rating: (9) Feedback Score: 9 reviews	Anyone? Please help.

05-27-2013, 03:29 PM	#4
ShimiBoi Zilvia Member Join Date: Feb 2009 Location: Hawthorne Posts: 216 Trader Rating: (9) Feedback Score: 9 reviews	I meant I didn't use the MBC but the vacuum line is still connected to the WG. I'll check for oil in the pipes now.

05-27-2013, 03:34 PM	#5
*FaLKoN240* Super Moderator Join Date: Jun 2004 Location: SF Bay Area Posts: 16,761 Trader Rating: (73) Feedback Score: 73 reviews	Check for a boost leak?

05-27-2013, 11:45 PM	#6
ShimiBoi Zilvia Member Join Date: Feb 2009 Location: Hawthorne Posts: 216 Trader Rating: (9) Feedback Score: 9 reviews	Couldn't find any boost leaks. But I did notice that there is a loud rattling noise at 3000rpm in all gears. I'm fearing that the turbo is making the noise. But I'll look more into it tomorrow. Boosting seems to be fine. No metal know the intake piping before the IC. Not sure what is causing the rattle.

05-28-2013, 08:36 AM	#9
ShimiBoi Zilvia Member Join Date: Feb 2009 Location: Hawthorne Posts: 216 Trader Rating: (9) Feedback Score: 9 reviews	I know there was some shaft play when I installed it a few weeks ago, but not that bad. I hope it is just something rubbing other than the compressor wheel.

05-30-2013, 12:07 PM	#10
ShimiBoi Zilvia Member Join Date: Feb 2009 Location: Hawthorne Posts: 216 Trader Rating: (9) Feedback Score: 9 reviews	So it turned out to be the downpipe bolts backing out. Thanks everyone for the help. Anyone know what a good base timing is on a ka-t running an Enthalpy tune is?

06-02-2013, 08:55 AM	#12
Duncan Steele Join Date: Jan 2011 Location: New Caledonia Age: 31 Posts: 34 Trader Rating: (1) Feedback Score: 1 reviews	Also did you upgrade the injectors? Adding boost is going to make the car run leaner, so your engine might blow cause it's running to lean. __________________ 1f y0u c4n r34d th15, y0u r34lly n33d t0 g37 l41d.

06-02-2013, 09:24 AM	#13
!Zar! Premium Member Join Date: Nov 2004 Location: North Korea Posts: 14,576 Trader Rating: (27) Feedback Score: 27 reviews	Sounds like you have a boost leak between the maf and the turbo. __________________

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