Turbo Intake Pipe Length

[GTS4onP]

Tried searching, no luck

As per the title was just wondering if the length/angle etc of the intake pipe between turbo and AFM would effect the car stalling when coming to a stop at traffic lights etc etc as my car is now doing. I have heard that a longer pipe will increase turbo backpressure and help stop this. Car is not running a BOV at all, and has a top mounted turbo etc etc

Cheers

[rob82]

Yes it does matter - plus the car will not run correctly without a proper recirc BOV.

[GTS4onP]

Yes it does matter - plus the car will not run correctly without a proper recirc BOV.

It used to run mint with standard turbo setup, generic front mount cooler kit and had a atmosphere venting bov on it though. Just since going Top mount with shorter intake pipe so thinking maybe that was the cause

[femno]

Is the new turbo BB?

A BB turbo tends to spit more air back at the AFM when you back off.

If you make the intake pipe really long, the effects of overfuelling you are experiencing will be minimalised.

[JonnoHR31]

yep, pays to try and stick to the standard style of a nice long pipe with a bend in it to help stop reversion over the afm

[r33cruiser]

I had to make mine come out about a foot, then right angle it to the airbox. Bit of ally did the job. I would like to put a few bends into it like the stock rubber intake hose, but I just dont have the room. I found a good tune will help, but only to a point.

PFC, no bov, hi mount 35r. Drives like normal. But when your on the track it can bog down when you jump on the brakes and stop quickly.

DAAAAMN U PFC DISEASE AND AIRFLOW REVERSION !!!!!!!!!!!!!

Here is a super gay fuzzy phone pic. But this length seems to work.

Edited May 12, 2010 by r33cruiser

[Dose Pipe Sutututu]

depends, the acoustics of the pipe affect the AFM, the louder the dose/flutter/re-circulation will alter the reading of the AFM. Even going from a stock intake to a metal intake change the AFM voltage reading causes slight idle problems when backing off, but I fixed this by upping the fuel deceleration cut off to 1200rpm on the powerFC

[Dose Pipe Sutututu]

Yes it does matter - plus the car will not run correctly without a proper recirc BOV.

that is a generalisation, if you adjust rows 1~3 on the fuel map this will correct over fuelling problems on deceleration. Most days I run my plumb back bov so tight there should just be a plate there instead and there's no farts/back fires or stalling issues.

[R31Nismoid]

I had to make mine come out about a foot, then right angle it to the airbox. Bit of ally did the job. I would like to put a few bends into it like the stock rubber intake hose, but I just dont have the room. I found a good tune will help, but only to a point.

PFC, no bov, hi mount 35r. Drives like normal. But when your on the track it can bog down when you jump on the brakes and stop quickly.

DAAAAMN U PFC DISEASE AND AIRFLOW REVERSION !!!!!!!!!!!!!

Here is a super gay fuzzy phone pic. But this length seems to work.

Rubber piping also helps alleviate that apparently - as a random side point

[GTS4onP]

Sweet as, Might get a longer pipe then, Does the diameter of the pipe affect it aswell? Or will just 3" mandrel bent be fine?

[JonnoHR31]

just use whatever size suits your turbo inlet

[rob82]

All the issues in this thread are can be alliviated by using a proper BOV.

[paulr33]

agree with Rob and also its not the ECU's fault so dont blame that

the stock rubber intake piping is accordian style for this exact reason, so if you remove the accordian style pipework, its likely to reverse on the airflow meter hotwire

dont hate the player, hate the game

[GTS4onP]

Can't put a stock Bov on, has custom I/C piping because standard J-pipe would hit the turbo

[paulr33]

the stock rubber intake piping is accordian style for this exact reason, so if you remove the accordian style pipework, its likely to reverse on the airflow meter hotwire

[r33cruiser]

Rubber piping also helps alleviate that apparently - as a random side point

Now ya tell me u bum.

ah well. good for a dose

And rob................no, no it cant.

Edited May 12, 2010 by r33cruiser

[rob82]

Now ya tell me u bum.

ah well. good for a dose

And rob................no, no it cant.

If your revering to maf reversion, which is the problem in this thread then yes a proper BOV will fix the issue.

[R31Nismoid]

Now ya tell me u bum.

ah well. good for a dose

And rob................no, no it cant.

I must have missed when you've said it before?

[adis]

I did the same thing, upgraded to 3 inch intake instead of, 2.5 inch standard intake. The car was running super rich and turning off inbetween gear changes... As soon as i unblocked the blwo off valve, car was back to normal, running normal and no stalling.

[rob82]

that is a generalisation, if you adjust rows 1~3 on the fuel map this will correct over fuelling problems on deceleration. Most days I run my plumb back bov so tight there should just be a plate there instead and there's no farts/back fires or stalling issues.

Maf reversion can occur at almost any maf voltage - so you maybe able to "tune" it out at low maf voltages but unless youwant big lean holes in your tune you can't fix the issue at higher voltages via "tuning".