turbo running help (newbie)
Turbo Mini Forums

got a problem with my turbo, ive set my idle fuel pressure to 4psi. but i dont seem to have a pressure increase wen my revs increase. causing the engine to cut out. the pipe out the side of the plenum doesent seem to give any pressure out?

cheers eden

13.95 1/4 mile on a 2.95 fd. Carnt be that hard to beat!

you will only get a pressure increase when it comes on boost.

If I go up the road it cuts out? Basically the air pressure from the plenum to the pressure regulator isnt there.
Ive tried going up the road and get to about 10mph and it just cuts out. I can blow in the pipe to the pressure reg and get the pressure up to 8psi.

Any ideas?

13.95 1/4 mile on a 2.95 fd. Carnt be that hard to beat!

mmmm,

ok, can you put a pipe onto the plenum ake of and blow through it? if not its blocked and needs clearing.

No I am able to blow through the plenum with no resistance. I tke it there should be a noticeable amount of air coming out at idle?
If not, would the fact I have put the fuel return into the low pressure side of my fuel pump affect anything?

13.95 1/4 mile on a 2.95 fd. Carnt be that hard to beat!

There should be no air coming out of the pipe on the plenum at idle as the engine is under vacuum.

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I wouldn't have thought you would notice anything coming out at idle,

your not likley to see any pressure out of there unitil you are doing at least 2500 rpm with a decent load on the engine ie when it starts making boost.

I would be temped to drop the pipe off between the turbo and plenum (so it's running N/A) and try it like that if it still does it it suggests its not the reg.

oh and the return feed back into the low pressure side of the pump should be fine as long as all the hoses are large enough.

ok, so if i remove the pipe and run it N/A and its still faulty, what could the fault be?

13.95 1/4 mile on a 2.95 fd. Carnt be that hard to beat!

if you've (or someone else) had the plenum of of the carb the holes from the plenum to the dashpot could be blocked (there are some dodgy gaskets with out the holes iirc)

no oil in the dashpot

timing,

has the engine been running ok previously?

ive made the whole in the gasket to pressureize the carb, (pos blocked carb?)

oil in dashpot yes
and timing seems to be fine

ive only just fitted the engine, its a learning curve

13.95 1/4 mile on a 2.95 fd. Carnt be that hard to beat!

ah, you seem to have an idea what your doing, :)

it may be worth popping the reg apart, the diaghrams can split which will screw the regulation up.

unfortunatly I'm not really an expert on the boosted carbs,

ive checked my reg by blowing down the tube, i could rasise the pressure from 4 to 7 psi so im assuming thats all fine there as if the diaghram was split it wouldent raise at all and if id did it wouldent stay raised.

13.95 1/4 mile on a 2.95 fd. Carnt be that hard to beat!

may have found the problem, i havent blocked off the anti run on valve, i shall block it and try it tommorow so fingers crossed

13.95 1/4 mile on a 2.95 fd. Carnt be that hard to beat!

That will do it. Reconnect it or block both ends.

Mine split once and caused the exact problem you describe.

In the 13's at last!.. Just

i really hope so was starting to annoy me abit today, but you live and learn

13.95 1/4 mile on a 2.95 fd. Carnt be that hard to beat!

SORTED, it was the anti run on. thanks for all your advice

new problem, clutch carnt cope at 6psi of boost, wat do i need to get to convert from verto to pre verto?

13.95 1/4 mile on a 2.95 fd. Carnt be that hard to beat!

Pre Vert Fly, backplate, pressure plate, clutch plate and arm. Best get one second hand and move on from there. You could do an RTS conversion.

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


Fibreglass Parts? - http://www.tdkracing.co.uk/
Split Rims? - http://www.force-racing.co.uk/

As above but if you get second hand you'll most likely have to use an inertia starter as the pre-vertos have a different ring gear.
If you buy new, ie. a lightweight one, most of the suppliers offer them with the option of a pre-engaged ring gear rather than the inertia type.

Schrödinger's cat - so which one am I ???

Is it a turbo clutch?

My standard turbo verto was fine up to 12psi.

In the 13's at last!.. Just

also if you convert from verto to pre verto or viseversa, then your wiring will need to be altered too, so stick with the same style as what you have already got to make it easier, and if you ever get a problem whereby when it comes on boost and its misfirey then that could be the fuel pump, as i had this problem when i forgot to turn the pump on once when i started my car :) it ran fine and never cut out but just diddnt work on boost because of the fuel pump not being on LOL! doh..

thanks for the help, ive been morspeed as its round the corner from me to sort the clutch and flywheel out so thats all sorted.
its running great now, my first turbo and I LOVE IT! need more power now but all in due time

13.95 1/4 mile on a 2.95 fd. Carnt be that hard to beat!

So Mr Morspeed is still trading then.

Might be worth reading this before you go back again

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=245390

ive heard all of this before, i have no troubles with him as hes only round the coner from me, and hes doing me a good deal so im happy

13.95 1/4 mile on a 2.95 fd. Carnt be that hard to beat!

so im happy.......


for now