Fuel cut?

[dsmBear]

Installed my front mount, recirculated greddy type s, 13 psi. stock turbo and wastegate. 94 gsx.
(90 94 Eclipse Talon Laser Intercooler Piping Kit DSM 1g | eBay)

So after first installing it, i was getting on it, maybe a bit past half throttle and the car made a loud clunk, and jerk movement from front end.maybe lasted a second or 2 and i let off and it stopped and havn't gone past half throttle since. Was it fuel cut? Do i need a tune for the larger amounts of air going through the turbo now?

 

[DogWhistle]

You certainly experienced the classic symptoms. Scary, huh?

You mentioned the IC, turbo and turbo system parts you put on, but were these larger than you originally had on it?

Perhaps your old setup had a boost leak that you sealed up now and the lack of fuel is showing up.

 

[dsmBear]

You certainly experienced the classic symptoms. Scary, huh?

You mentioned the IC, turbo and turbo system parts you put on, but were these larger than you originally had on it?

Perhaps your old setup had a boost leak that you sealed up now and the lack of fuel is showing up.

only thing different u put on is a different bov and a front mount

 

[phr0st]

only thing different u put on is a different bov and a front mount

Have you done a solid BLT? A large leak (or a multitude of smaller ones) may cause a bit of maf over-run. Although I'm not even sure that's possible on a stock turbo.

 

[codym]

http://www.dsmtuners.com/forums/bol...el-cut-backfire-issue-after-fmic-install.html
http://www.dsmtuners.com/forums/newbie-forum/403481-problems-after-new-fmic-install-please-help.html
http://www.dsmtuners.com/forums/turbo-system-tech/311641-fmic-boost-15psi-problems-fuel-cut.html
http://www.dsmtuners.com/forums/newbie-forum/324255-fuel-cut-after-fmic-install-no-boost-leaks.html

I'd verify 100% you are boost leak free ,

Since you did order that from eBay I'd double check for pinholes around any welds and around the core , did you visually inspect it before installation ?
I got a brand new eBay Fmic that came with my 1g when I bought it , never opened or used.
Right out the box I noticed 3 holes , 2 in the outlet of the core and 1 on the inlet. I tossed the core and kept the piping , all that was good.

 

[dsmBear]

http://www.dsmtuners.com/forums/bol...el-cut-backfire-issue-after-fmic-install.html
http://www.dsmtuners.com/forums/newbie-forum/403481-problems-after-new-fmic-install-please-help.html
http://www.dsmtuners.com/forums/turbo-system-tech/311641-fmic-boost-15psi-problems-fuel-cut.html
http://www.dsmtuners.com/forums/newbie-forum/324255-fuel-cut-after-fmic-install-no-boost-leaks.html

I'd verify 100% you are boost leak free ,

Since you did order that from eBay I'd double check for pinholes around any welds and around the core , did you visually inspect it before installation ?
I got a brand new eBay Fmic that came with my 1g when I bought it , never opened or used.
Right out the box I noticed 3 holes , 2 in the outlet of the core and 1 on the inlet. I tossed the core and kept the piping , all that was good.

Welds are fine, I re tigwelded any spots with question, there was about 3. Easiest way to do a boost leak is the pvc cap with a pump and pressurize the turbo and listen for leaks right?

 

[phr0st]

Welds are fine, I re tigwelded any spots with question, there was about 3. Easiest way to do a boost leak is the pvc cap with a pump and pressurize the turbo and listen for leaks right?

There are a ton of threads and videos on how to do a proper boost leak test. I like Jafro's vids because he is very meticulous and informative. Here you go:

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[98_tsi_]

Do you have a boost gauge? Shouldn't be hitting fuel cut at 13psi...

 

[97_4g63t]

+1 on doing a blt. Ran fine before you changed intercooler and bov so I would say a coupler is leaking, intercooler or bov is leaking.

 

[maxharmony537]

probably sprung a leak and engine lost boost and then smacked into the engine bay.moter mount

 

[dsmBear]

Do you have a boost gauge? Shouldn't be hitting fuel cut at 13psi...

yes an autometer boost gauge

 

[97_4g63t]

probably sprung a leak and engine lost boost and then smacked into the engine bay.moter mount

Do whaaaaaaat? Ha ha ha ha

 

[codym]

Any results of the blt ?

probably sprung a leak and engine lost boost and then smacked into the engine bay.moter mount

Umm .. WTF

Well damn I haven't thought about getting the motor mount for the entire engine bay, darn.
I'd have negative wheel hop. Gravity suit maybe ?


If you said that in reverse order , perhaps you meant ...
IC piping Smacked into the bay motor mount , sprung a look , then the engine lost boost... ?

I've never had an issue with "smackage" between a properly mounted fmic and ( I'm assuming) the exhaust side motor mount that sits on the cross member directly behind the radiator, or any other mount locations.

Unless your IC pipe is made of toilet paper than I don't see bumping it causing a problem unless you knocked a coupler loose.

 

[WES_393]

Like mentioned, it sounds like your typical "bucking" due to a boost leak. True fuel cut will leave skid marks on the road and your underpants.

Pressure test the intake and spray soapy water onto the piping- Any leaks will show up as bubbles.

 

[dsmBear]

Like mentioned, it sounds like your typical "bucking" due to a boost leak. True fuel cut will leave skid marks on the road and your underpants.

Pressure test the intake and spray soapy water onto the piping- Any leaks will show up as bubbles.

Took it out today, floored it on an unpopulated road, boosted fine all 5 gears and no jerk movement... and I havnt event done anything yet.

 

[miguelmcv]

I have experience this sound and the problem with the car keeping up when boosting after the sound.

In my case was a loose coupler, I checked everything and couldn't find anything, everything looks normal, after moving the pipes (hard) side to side, I found a loose coupler.

I suggest like all the others here.

Do a boost leak test.

 

[dsmBear]

I have experience this sound and the problem with the car keeping up when boosting after the sound.

In my case was a loose coupler, I checked everything and couldn't find anything, everything looks normal, after moving the pipes (hard) side to side, I found a loose coupler.

I suggest like all the others here.

Do a boost leak test.

Finally got time to make one. What method would work the best(2 pics below)

I followed vfaqs but 2.5" tube is rubber hard to find so I had to get an almost hard plastic tube, and would have to cut it. The one with the red coupler is just my idea when I had all parts layed out.

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[untouchablecc]

Your on the right track sir. Most valuable and inexpensive tool in your dsm arsenal.

 

[dsmBear]

Your on the right track sir. Most valuable and inexpensive tool in your dsm arsenal.

Yeah but I have no idea which one to use .

 

[97_4g63t]

I would use the second one without the hose. Definitely getting there though.

 

[dsmBear]

I would use the second one without the hose. Definitely getting there though.

Alright thanks. So once I have that all ready just disconnect the tube from the maf where it goes to the turbo, out the tester on, and pressurize it

 

[97_4g63t]

What size of coupler do you have? I just take my intake off and clamp it to the turbo. You using an air compressor?

 

[dsmBear]

What size of coupler do you have? I just take my intake off and clamp it to the turbo. You using an air compressor?

2.75" and bike pump cause I'm poor.

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[97_4g63t]

2.75" and bike pump cause I'm poor.

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Ha ha ha ha all you need to do is try to hook it up where your intake connects to turbo. My first one was with a pump. I ended up getting a lil 3 gallon air compressor. Garage sales have them cheap. If you cant hook it up there try connecting it to your intercooler piping right after the turbo. That coupler is going to be too big. You might be able to rig it but idk it has to be air tight. Get it hooked up somewhere and have a spray bottle with soapy water ready. If you have a bad leak you probably wont build any pressure. Have to spray everything down first or get some help to listen and look.

 

[dsmBear]

Ha ha ha ha all you need to do is try to hook it up where your intake connects to turbo. My first one was with a pump. I ended up getting a lil 3 gallon air compressor. Garage sales have them cheap. If you cant hook it up there try connecting it to your intercooler piping right after the turbo. That coupler is going to be too big. You might be able to rig it but idk it has to be air tight. Get it hooked up somewhere and have a spray bottle with soapy water ready. If you have a bad leak you probably wont build any pressure. Have to spray everything down first or get some help to listen and look.

I got 2inch coupler but my only air hose fitting is pretty much permanent in that cap and the cap doesn't fit the 2"