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My Intake Pipe Design, Stalling Issue And Lean Popping

SargeRX8

By SargeRX8,
in Engines & Forced Induction

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SargeRX8 Grand Master

SargeRX8

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Well I pulled off my old intake to measure up a newer new one. Attached are the pics below. The bends are two roughly 45 degree bends with some angling done to face the side of the car. Since these are two 45 degree straight cuts, will this pose an issue? I see some people using curvy bends while mine is a sharper bend. Ive attached some pics so you can see how it looks. It was awesome too, the pringles container is exactly 3" awesome piece of tube to have to measure up some piping, easy to cut, tape together and measure!

Anyway, after I measured it and put the car back together with the old pipe, 3 times today my car switch off when clutching in after coming on boost. To ensure I am on the right page, is this an indication of boost leak or a vacuum leak? If it was a leak under boost, I would be blowing smoke because I am not breathing enough air. But it stalls after clutching in... I do not run an atmo BOV and my current intake pipe never had any recirc issues where the BOV line affected the AFM(its facing the turbo on the return and is after a bend. I haven't pulled it apart again but everything looks tight. The car was not stalling before.... It was also not lean popping. Now it appears when I am on idle and try to hold say 2500rpm in neutral, it will splutter and pop. This is NOT evident when driving but when I clutch in and the engine revs down to idle it splutters. Could all these problems be related to a vacuum leak? I didn't have time to check it out as I just got back from work.

I hope my fuel pump isn't failing again. I am sick of going into that damn tank. I can hear it priming and under full boost the car drives brilliantly. It seems just under tiny tiny load(like the throttle JUST touched) when cruising, and more evident when in neutral.

In the pictures, the metal bottom of the pringles tube is facing the turbo.

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DVS JEZ Grand Master

DVS JEZ

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What fuel pump did u fit again? Wasnt it a second hand gtr pump?

Maybe its starting to fail, it is a bit weird that its only happening since u made a new intake pipe.

Try earthing the fuel pump in the boot so that its not a variable earth. This may fix the lean pop issue at idle.

boostn0199 Grand Master

boostn0199

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I see nothing wrong with the intake design itself as i run one with a 90 degree and 45 degree bend with no problem.

Why didnt you just put a decent new pump rathet then mucking around with 2nd hanf parts that are just as old.

SargeRX8 Grand Master

SargeRX8

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  On 15/09/2011 at 9:19 PM, boostn0199 said:

I see nothing wrong with the intake design itself as i run one with a 90 degree and 45 degree bend with no problem.

Why didnt you just put a decent new pump rathet then mucking around with 2nd hanf parts that are just as old.

I needed a pump asap. I ordered a 040 new but it took its time to come so I found a wrecker selling the gtr pump on saturday. I needed the car asap. I'll ground it today and see how she goes. I'll then adjust my intake setup double check for leaks then test the stalling. Luckily I'm on last quarter fuel.

SargeRX8 Grand Master

SargeRX8

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I'll be fitting the fuel pump in tonight if I can. Grounding this pump didn't fix it and it seems I'm stalling after boost and clutching in. I've even blanked off my bov incase I was having recirc issues and no luck. Also noticed my fuel cap was so pressurised it was hissing when closed... How do you pin point a intake leak?

paulr33 Grand Master

paulr33

Posted
Posted

the stock intake piping is accordian style to avoid reversion over the AFM hotwire signal

you might find using prefectly curved pipework with a smooth edge introduces reversion which makes the AFM tell the ECU you have whacko air flow meter load, thus it stalls

this is common when people change their intake pipe to nice smooth shiny finish pipework (like what you are doing)

scotty nm35 Grand Master

scotty nm35

Posted
Posted

I have never had a customer complain of reversion with one of my intakes, as long as the bov points towards the compressor the two bends should stop any further reversion. I do use lobster bends though which may help a little.

GTSBoy Grand Master

GTSBoy

Posted
Posted
  On 16/09/2011 at 3:28 AM, paulr33 said:

the stock intake piping is accordian style to avoid reversion over the AFM hotwire signal

you might find using prefectly curved pipework with a smooth edge introduces reversion which makes the AFM tell the ECU you have whacko air flow meter load, thus it stalls

this is common when people change their intake pipe to nice smooth shiny finish pipework (like what you are doing)

Bullshit.

SargeRX8 Grand Master

SargeRX8

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Those pipes are smooth but they do have some crazy angel on the return pipes., my old pipe on my old car just wasn't working. this pipe was fine. it probably isn't reversion because I did disable the bov. It seems like a leak somewhere. Anyhow I am installing a 040 now. Lets see how we go.

wolverine Grand Master

wolverine

Posted
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  On 16/09/2011 at 4:54 AM, scotty nm35 said:

I have never had a customer complain of reversion with one of my intakes, as long as the bov points towards the compressor the two bends should stop any further reversion.

I think this is the key reason for reversion.

SargeRX8 Grand Master

SargeRX8

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  On 16/09/2011 at 5:44 AM, GTScotT said:

Woman driving lol.

Sarge are you off work today? I dont mind taking a look for you, am in Penshurst.

This would be very appreciated. Are you free this sunday? I can bring it to you then as I need help because I just fitted the new fuel pump and no luck. Issue seems evident (the popping issue) after the engine is above 45c. new spark plugs go in tomorrow as well as examining more vacuum lines

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