philram

iTrader: (3)

i'm running a t34.63 on a 7.2 comp yb at 30psi and i'm not getting full boost till about 5k and it seems to take ages to spool up.
can anyone advise me as to whether these wheels would have anything to do with it...





cheers

Carlsworth

not a geniuine garrett T34 is it??? like the ones from escort cossie

T34 intake is smoooooooth, and doesnt have a lip


wheres the turbo from

and before anyone says, get the shaft wheels cutback, dont bother...waste of money for the gain you will see

besides, i know someone thats selling a lightweight MarM-247 shaft that already has the blades cutback

see my sig


you would defo see improvement then

carl


edit to say...IF its a proper T34 spec, then its not to do with the turbo the reason it take so long to come in, try a different actuator

Turbosystems

iTrader: (5)

the compressor looks like a rally car one that has had the restrictor removed
check waste gate penny is sealing hole and check waste gate preload

Carlsworth

yep, good point....didnt think of that

philram

iTrader: (3)

cheers for the responses guys...
the turbo was 'apparently' from a grpa escos and still had the restrictor fitted when i got it. i'll try another actuator and see if that helps.. any other ideas

Turbo Zetec

iTrader: (1)

the actuator may be at fault, but make sure you look at the exhaust housing around the wastegate area, if its cracked, it'll take forever to spool my old t3 was really bad worked a treat when i changed the exhaust housing

mechanic28

iTrader: (5)

out of interest how much are a .55 or .63 exhaust housings?

MAD Ade

iTrader: (1)

Sounds like the waste gate penny may not be fully closed.

Tim

iTrader: (1)

air leak maybe

Ian M500COS

I'd be inclined to agree with Tony and Ade on this one. A turbo this "small" should not spool up that late unless it had a problem - the penny washer not sealing would be the prime suspect for that.

Happened on my 3 door years ago.... it was sluggish as hell. Got that fixed and it dropped the spool up time by 2000 rpm. Let us know what is it when you cure it.

philram

iTrader: (3)

cheers again guys... i'll try it and let you know

fuzzy

i also have a spare t34 with .63 housing but it has a 34mm restrictor fitted. whats the purpose of the restrictor as im advised its to big for my set up so i bought a stage 2 t34 with .48 instead and that spins up at about 1400rpm.much more usable

philram

iTrader: (3)

i've just looked at the penny washer and it doesnt seem to be sealing properly.
you can see from the photos that the washer isnt in the centre of the hole, and if i shine a torch from the exh side i can see some light from around the top of the washer.





can i just knock the sleeve that holds the washer arm up to raise the washer, or is there another way to do it?

philram

iTrader: (3)

the restrictor was required by the governing body, to basically slow the cars down by restricting airflow into the turbo therefore reducing the possible max power. it kept them to about 300bhp.

philram

iTrader: (3)

i've adjusted the penny washer and changed the actuator and this is what i'm getting... is this still slow for a t34.63 ?

foot flat from 2k in third..



foot flat from 3k in third..

davidreader5

Hi, if you have checked the obvious, no air leaks, on the exhaust & from the turbo to the inlet manifold including the intercooler,, also that the airfilter is in good condition, and set the actuator preload correctly, and the penny washer of the wastegate is sealing, then what chip have you got, as the boost is mappable,
i assume the turbo is in good condition, also check your exhaust system is clear, no restrictions. are you using a amal valve,


Regards Dave R.

philram

iTrader: (3)

checked all that apart for the intercooler, i might try putting a standard cooler on it to see if it makes any difference, also got a standard t3 so might try that aswell to see if its the turbo...

TiB

iTrader: (1)

I'd say the blades are cut back already.

Any cracks around the penny wont cause much noticable change.

If the rear wheel doesnt fit snug into the rear housing that will cause it to be laggy.

A boost leak would feel laggy too.


Lee