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2nd gear slow boost pop noise then loss of power WTF??

chop91vr4

Well-known member
Joined
Jul 31, 2014
Messages
61
Location
new haven indiana
In second gear if i take & build the RPM's & boost slowly & get to I'd say around 4500 RPM there is a horible pop sound & loss of all boost & power, I let off & can get right back into it. Can anyone tell me what is going on? Thanks
 

chop91vr4

Well-known member
Joined
Jul 31, 2014
Messages
61
Location
new haven indiana
I haven't tried to dup more then just once due to I was worried I may damage something. So didn't try any other gears, all pipes are still in their clamps but I will check tightness. I am running about 17psi at max but I unfortunately I was not watching boost guage when I duplicated because I watching reevs to see if my tach/shift light was reading the same as the factory tach & i wasn't hitting redline.
 

chop91vr4

Well-known member
Joined
Jul 31, 2014
Messages
61
Location
new haven indiana
It felt & sounded different then when I have blow a intercooler pipe out of its' boot, & what was odd is that I could get right back into it and had boost it was just like i built up to a point to where it just blew it all off or should say dumped it out the waste gate. Does that sound logical?
 

strokin4dr

Well-known member
Joined
Aug 30, 2005
Messages
2,770
Location
Savannah, GA
What plugs are you running and what are they gapped at? Sounds like an ignition problem to me. I have some experience in that dept. /ubbthreads/images/graemlins/rofl.gif
 

chop91vr4

Well-known member
Joined
Jul 31, 2014
Messages
61
Location
new haven indiana
NGK BPR7ES plugs & I can't that I gapped them to any thing, I should of thought of that when I put them in, I just put them in about a month ago. I have no clue what they should be gapped to. here is the list of mods..

- Eagle Rods
- Wiesco Pistons
- Arp Fasteners & Head Studs
- 4 bolt rear
- Updated 1993 Headlights and Tail lights
- 60k miles on a fresh JDM 4G63, 200k+ on body
- Balance shafts eliminated, 4WS eliminated
- rebuilt tranny with a welded diff
- Coil on Plug ignition upgrade
- NGK BPR7ES plugs
- aftermarket fuel pressure regulator
- AEM Fuel rail
- manual boost controller (set@17psi)
- large front mount intercooler w/custom piping
- Tial BOV
- 3" turbo to 2.5” back with Thermal muffler
- K&N filter w/adapter pipe
- GM-MAF
- MAF Translator
- Ported EVO3 16G turbo
- Godspeed Header
- Godspeed down pipe
- 560cc injectors
- upgraded 255 fuel pump w/correct rewire
- battery relocated to the trunk
- ACT 2600 clutch
- 5-lug conversion
- urethane sub frame bushings
- Urethane Engine mounts
- new master cylinder, new slave cylinder with extended push rod
- HR lowering springs
- KYB adjustable struts
- Replaced oil return gaskets & Tube
- 300mm Momo steering wheel
- Manual seat belt conversion
- Boost Gauge & Narrowband a/f gauge in dual pillar pod
- Water Temp Gauge
- Short throw shifter
- Shift light W/ Digital Tach
- Slim Rad fan
- Oil cooler delete
- Full A/C delete
- FIAV Bypass
- Sony Clie Data logger
- Apex turbo timer/multi-function
 
Last edited:

strokin4dr

Well-known member
Joined
Aug 30, 2005
Messages
2,770
Location
Savannah, GA
Ok, pull the plugs back out and gap them down to 0.028" to start with. That should be fine with your current setup. If it still breaks up, try reducing the gap a bit more, to about 0.025".
I had the same issue. Just kept reducing the gap til the problem went away.
 

iceman69510

Turn Right Racing
Staff member
Joined
Mar 5, 2001
Messages
10,971
Location
Michigan
Quoting pot:
More than likely a boost leak. In this case ensure your intercooler hose clamps are tight. Is it only in second? What boost are you running?



I seem to remember someone on here having a split in a hose that only opened under boost of course.
 

EHmotorsports

Well-known member
Joined
Sep 25, 2012
Messages
1,278
Location
Beaverton
I also remember something about that. boost leak test it to verify. Run the pressure up to what you would normally run or 25 psi. whatever is higher.
 

ade

Well-known member
Joined
Aug 16, 2011
Messages
303
Location
Paumanok NY
are you chipped? dsmlink? afc? what engine management solution are you running?
 
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