redrsmk5

Hello all

How can i tell if i have an air leak and where on earth would i begin to check for one??

The reason i ask is when driving along and not using the turbo my centre pod boost gauge sits at 0 instead of the -0.6 resting on the stop, whereas my friends (stundies) sits on the stop when driving along , also when i first start the car it rises up to 2k+ fast idling for about 30 seconds or so then settles to a nice idle level. It also revs slightly higher than it should changing from 1st to second and only revs normally when clutch fully out or when sat completely still????

My car has always done this i thought it was normal but having seen my friends sit at -0.6 now im not so sure

As always any help appreciated
Many Thanks
Martin

L3 COS

you,ve probably polished a hole in the inlet manifold buftying..

ryan_belfast

ANTI LAG

AJC

iTrader: (6)

yes, sounds right martin, get some one to sit in drivers seat nd watch the gauge,

then check all vac hoses, map sensor, inlet etc

i found one in mine behind map sensor, caused the car to boost funny.

probably one of the inlet ones seeing your inlet been of etc

redrsmk5

Cheers AJ!! some serious help!!! When the other persons sat in the seat do i pull all these hoses off or just check them????

L3 COS: yours should leak like a sponge then

Ryan : I doubt it mate!!!

stundies

Give me a shout if you want me to help you to find it mucker, might give Demon Tweeks a miss on Saturday, could come round then to do some investigation if you wanna

adamski frst

hose clamps can also be a problem too so check them too matey i'm off to buy some more milakor clamps tomorrow how sad am i...

probably something silly

lowman

the easiest way to find the air leak..is to spray carburetor cleaner on different parts of the engine..where it sucks air..and check if the idle is rising when you spray...for an example spray around the inlet manifold..or around hose connections

good luck mate

AJC

iTrader: (6)

redrsmk5

dont pull them of martin, as that will definately give an air leak and wont help find it,

listen best you can for an air leak, use the back of your hand where hairs are to try feel it, or alternative, top lip is a good one

so you can kiss your engine

Aaroncast

get a small bore tube and stick it in your lug!! or use a doctors stethescope!!
I USE ONE WITH A PIECE OF BRAKE PIPE INSERTED INTO THE TUBE AND USE IT AS A PROBE-SUPRISING WHAT YOU CAN HEAR ESPECIALY AIR LEAKS-ALSO GOOD FOR TWIN 45/50'S FOR BALANCING AIR INTAKES

-OLD SKOOL STUFFS IS STILL THE BEST!!!!!!!!!!!!!!! GURU7001/2

Aaroncast

get a small bore tube and stick it in your lug!! or use a doctors stethescope!!
I USE ONE WITH A PIECE OF BRAKE PIPE INSERTED INTO THE TUBE AND USE IT AS A PROBE-SUPRISING WHAT YOU CAN HEAR ESPECIALY AIR LEAKS-ALSO GOOD FOR TWIN 45/50'S FOR BALANCING AIR INTAKES

-OLD SKOOL STUFFS IS STILL THE BEST!!!!!!!!!!!!!!! GURU7001/2

redrsmk5

Cheers mate...the listen best sentence makes you sound like yoda!!! ..........Mate i kiss it anyway Will give it a go on Saturday then and see you on Sunday.

Thanks everyone else

redrsmk5

Great advice and thank you but as for spraying stuff everywhere im not keen,maybe after sunday

redrsmk5

Ok guys,ive dug out my boost valve i bought late last year from fleebay which has a good vac and 20psi boost on it, where can i "T" into to get a good true reading on this as the car doesnt go into the broken lines on the standard boost pod hardly at all, driving it to and from the pod wasnt as rewarding as it should be and i feel it has so much more to offer, so i want to see what PSI its running after ive found this air leak or will the airleak make it have this performance issue?????

Thanks
Martin

AJC

iTrader: (6)

remove banana pod clocks and tee of the standard pipe to boost guage,

that way it is still going to work both of them, very simple to remove

redrsmk5

top man as always!!

AJC

iTrader: (6)

redrsmk5

redrsmk5

Hi all,bit of an update and help required from the findings please

Ive checked bloody everywhere for the air leak and i cannot find it .Ive tightened all inlet bolts and nuts, new gasket on iscv,cleaned iscv out, and car still high idles through low gear changes and idles high from first start up

Is it possible that when the previous owner had Stu@MSD live map it that the chip or setup would make the air be available when it probably shouldnt???

Anyway i tried the boost gauge today (only a 20psi one) and in 3rd gear it peaked at 14 psi then in 4th gear (the best gear apparently) 15psi. Vacuum on the gauge was showing 10 not 0.....is this right???

Surely i should have more than that with my spec !!! Im tempted to give the actuator a full turn tomorrow but am concerned in doing that incase i really do have an air leak....is it safe to do this or could it detonate????

What PSI do other stage 1s peak at or are running??

I have a high pressure fuel pump, Mongoose exhaust, PPP8 plugs, Group A Cone filter, -31 Forge actuator, Collins 305 chip, 60mm rs 500 cooler, T25 turbo which has no play.

Sorry to ask so many questions but im unsure on setups etc, will take em apart all day long Thanks in advance for any help given
Martin

THE RADMAN

iTrader: (2)

have you checked vaccuum pipes/fittings at bulkhead end of manifold,and the t piece on the inside of the manifold near the oil breather?

MATCOS

iTrader: (1)

Hope you get it sorted Martin

redrsmk5

Yes mate, that now has a blanking plug in it that came with the mirror image breather kit. The old pipe has a 1 way vac item in it, but to eliminate that i blocked it up completely with that 1 way item removed and still nothing. Its baffling me as i have all new cometic gaskets down the inlet side. When i bought the car it sat at 0 on the gauge, then it had all the standard black vacuum lines and boost hoses, now ive uprated the boost hoses to samco and changed the vacuum lines for good quality thicker walled items,not cheap shit from ebay, ive got zip ties on all unions and T pieces, ive disconnected the dump valve and still the gauge wont drop to -0.6.

Its so hard listening for an air leak as all i can hear is the engine but will try again today

Today im gonna try upping the boost a bit anyway as 15psi for my spec is a bit poor so will let you know later how that goes.


MATCOS: so do i mate

Rippers

Have you checked the inlet manifold to plenum gasket usually the most common place to find an air leak

Edit: just read you have cometic gaskets

THE RADMAN

iTrader: (2)

what hose have you blocked off? have you checked the boost guage hose? from manifold to back of guage itself? im sure it tees into something on the small t model

redrsmk5

i tried blocking the hose off that used to go into the inlet manifold from the pot type thing that lives on the chassis leg apparently from a previous post of mine it used to put tank fumes back into inlet. Will check hose to gauge again tomorrow but sure its fine.

Anyway the gauge dropped slightly today instead of being at 0 when driving its a third of way to -0.6 getting there but fook knows what i did to get it down that bit So i gave the actuator a full turn today, test run proved fine and no detonation, so another full turn saw it perform even better,checked all plugs and lovely brown colour after this run so safe to run at new setting holding 17psi now in 4th gear and 18psi in third

Goes really well now so am very happy but will get car booked in with Stu @ msd soon for full setup just to be sure

Thanks for all posts, great help as ever from all

MArtin

THE RADMAN

iTrader: (2)

dont blank off the fuel tank breather , i should reconnect it,just make sure the non ret valve is still fitted

redrsmk5

Its not blocked off, its on the chassis leg with the loom with the non return valve still on it

THE RADMAN

iTrader: (2)

i should reconnect it back into manifold, have you checked your dump valve? make sure its sealing properly and not sucking in air? could also be losing boost pressure if its dodgy?

Rippers

That's a very good point! if you have a DV and airflow meter! blank it off

redrsmk5

Thanks Guys

Blank what off though the dump valve or the vapour pipe back to inlet manifold??????

L3 COS

just reading yr post martin,and the guys took the words out my mouth right at the last post!!
i had a problem once on an rs turbo,couldnt stop it pinking,changed absolutely everything (literally) even the wiring loom,and in the end it was the dump valve leaking i know you have a slightly different problem but worth checking or blanking off as suggested..

redrsmk5

Have driven the car with dump valve isolated and still didnt drop on the gauge

Wastegate sounded mint through the big filter too, but dont feel safe running the car without the dump valve TBH.

THE RADMAN

iTrader: (2)

the d/valve

topham

i know is probs an old topic, but i work on the engines at mytravel aircraft engineering at manchester. And wen we fit new parts we spray them with a white developer, then if there is any air leaking from certain valves or clamps etc it turns the devoloper to like a white dust cloud, so u can quickly see where its coming from. I will check the item tonight in work and then post it up

it may not be handy to use on this occasion, but its handy for others who might be experiencing similar faults

THE RADMAN

iTrader: (2)

did you sort this?

redrsmk5

nope Since ive chipped the paint i havent bothered with the car its covered up

But........... i will be reconnecting this to the inlet manifold . I found the old T piece from the original breather system, i just need to figure out how to properly blank off the other side of the T piece somehow.

THE RADMAN

iTrader: (2)

prob be easier to buy another 90 degree one instead, 1/8 npt thread,one more thought did you use any studlock or similar on your throttle bracket bolts when you bolted it back on the inlet manifold? as it could be leaking air around those joints

redrsmk5

Nick..........Youre a genius!!! you may be right there you know on the throttle bracket, will try and obtain one of them from somewhere.....god knows where though.....maybe tweeks or my local engineering outlet

Aaroncast

USE A STETHERSCOPE (DOCTORS TYPE) ANY AIR LEEK IS MAGNIFIED SO LOUD YOU CANNOT HELP MISS IT----SNAP ON DO THEM!! HANDY FOR BALANCING TWIN 40S ETC ASWELL----------HAIRS ON THEBACK OF YOUR HAND!!!HA-HA-HA --------YOU A GORRILLA THEN-

redrsmk5

haha yeah right, my dad takes the piss enough as it is without me wearing a stethoscope,.......... might try and borrow one then try it when he goes out

THE RADMAN

iTrader: (2)

let me know if you cant find one [1/8 fitting]as i have some spare,i think most places should sell them ,normally used for fuel fittings etc,tweeks will deffo have some,most likely be brass ones