Pressure Tesitng Intake Hoses

[Doug_RS2]

My boost pressure peaked at 4000 rpm and dropped right off - Mihnea thought I would have a leak - Didn't have any other faults.

I think he was right

[Doug_RS2]

It was that bad I tried pumping the intake system with a bike pump (a decent one) and got no pressure build up at all.

I connected a compressor and switched it on for short bursts - and could hear the hissing.

[Doug_RS2]

I also checked my wastegate actuator with a Mityvac - It held 20psi without leaks(I'm assuming that psi is ok?)

[Doug_RS2]

I'm happy I found the leak as it means my car should be a LOT faster and pull harder at higher rpm.

Greg might save some cash now as the RS2 setup should be a lot better than it was when he was in it at the weekend

Just waiting for my metal T-piece pipe from Demon Tweeks so I can chop that hose up - no point buying a new one since the SAMCOs should be here soon??? It probably costs £200 to replace that one hose :eek2:

[blu_s2]

Related... where can I get a MityVac from?
Cheers

[Doug_RS2]

http://www.auto-tools.co.uk

Make sure it is the one that can to pressure AND vacuum - most sites say they can do both but they don't - about £100 for the Dual one : Mityvac Pump & Dual Converter MV4050.

[blu_s2]

thanks

[Greg_S]

Originally posted by Doug_RS2
I'm happy I found the leak as it means my car should be a LOT faster and pull harder at higher rpm.

Greg might save some cash now as the RS2 setup should be a lot better than it was when he was in it at the weekend

Woah, felt very quick when was out in it the otherweekend anyway.

Want to take me out for another spin once its done....

[Doug_RS2]

Greg - I plotted the boost pressure against RPM and Speed in another thread (for sale section I think) and it reaches 22psi at 4000rpm but then drops right down. It still gets the kick, it's just that it doesn't carry on pulling.

The split on the inside of the hose is about 40mm long, 25mm on the outside but the cloth embedded in the silicon is keeping it together - it's hard to see - still a big hole though

Can't wait to try it when it's fixed - I'll get more boost graphs and I'll do the vag-com power/torque curves

[Doug_RS2]

Link to other thread

[Dr H]

@Doug

I just tried to test my intake hoses using pretty much the same setup and could get no pressure reading on the bike pump gauge. It was a pretty decent 'track pump'.

I did get some pressure in the system but not a lot. If I released the valve it hissed but only slowly and if I took the filler cap off there was a realease of pressure. What sort of compressor did you use, a tyre inflator or something a bit more serious?

@ Anybody!!!!

I'm having some strange problems with my car and it seems to be flat spotting when peak boost occurs and the boost drops off really quickly. Seems worst in 5 and 6th but I can get it to do it in 4th and sometimes even in 3rd. I saw very high peak boost in 3rd yesterday (as high as O/boost should be) and I am sure that the turbo sounds like it is spinning really fast but it doesn't seem to equate to rapid forward movement

Any suggestions anyone?

Leigh

[S2central.net]

Leigh - best to get one of those cheap little 12V compressors for car tyres - it'll shift enough air to pressurise the system much quicker than a bike pump.

Paul

[Dr H]

Halfords here I come

[Doug_RS2]

I got nowhere with my bike pump - there is a lot of volume there to fill - and if you have a leak you are going to be pumping all night

I used a apray gun compressor, only switched on in short bursts as I didn't have a clue what pressure it was reaching - that weas enought though to hear the leak.

I recently realised I can move my boost gauge onto the dash and keep an eye on that through the windscreen, to see what pressure I was getting.

[Glen Chamberlain]

Originally posted by LPHUK2002
@Doug

I just tried to test my intake hoses using pretty much the same setup and could get no pressure reading on the bike pump gauge. It was a pretty decent 'track pump'.

I did get some pressure in the system but not a lot. If I released the valve it hissed but only slowly and if I took the filler cap off there was a realease of pressure. What sort of compressor did you use, a tyre inflator or something a bit more serious?

@ Anybody!!!!

I'm having some strange problems with my car and it seems to be flat spotting when peak boost occurs and the boost drops off really quickly. Seems worst in 5 and 6th but I can get it to do it in 4th and sometimes even in 3rd. I saw very high peak boost in 3rd yesterday (as high as O/boost should be) and I am sure that the turbo sounds like it is spinning really fast but it doesn't seem to equate to rapid forward movement

Any suggestions anyone?

Leigh

Make sure the lambda is clean and genuine! Also clean the MAF plug with brake cleaner and put a touch of WD40 on or sommat similar on to prevent corrosion and try that! Even if it looks good just do it! I did and so far so good?

Also to test the boost pipes its aint too easy or may be I did it the hard way? I took the pipe off the IM and blocked it with a aerosol can and tighten the clip. Also did the same with the turbo exit pipe (need to find sommat smaller though, can is too big) Then I used a 8mm 1/2 inch drive socket in the idle valve pipe with some rubber hose over the end and charged it with 18-19 psi of pressure. (U may need to block the dump valve etc.) I used a pressure reducer on the airline at work with a tyre gauge on and watched how fast it drops?
You may get it with the mini compressor but if you have a reasonable leak then I wouldn't put too much money on it. (Have you seen the size of them little compressor pistons?)
I originally tried from the MAF but with no success cos it leaks into the engine breather hoses and god knows where else! Anyhow I didn't like the way the MAF to turbo pipe expanded with pressure after I block a few holes so I did it the other way?

Anyhow see how you go on!