help on loss of power
Turbo Mini Forums

Can you explain that to a chimp please robert lol

Joe , theres a lot more play than a moth ago or when it was new. I struggle to load a vid on here , i might do one once facebook

,sure Rick , when you pull the rod from the wastegate actuator to fit it on the flap actuation arm pin ,it has a bit of pre load .

if you lay the arm on the pin without stretching it against the spring , it should overlap the arm pin by half a hole .

then you pull it that little bit more for it to slot onto the pin .

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Is the flapper valve actually full open when you experience boost creep?

what device are you using to increase boost?

I don't need a device at the min Colin it increases boost itself !!

I have a bleed valve fitted and it looks like the actuator is set at 14 psi as that's what it boosts to from 3.5k up to 5.5k then every few hundred revs up it keeps adding more boost




my efforts this morning , but looking at the pic there could possibly be a tiny bit more .

top pic is what I already modded so its smaller than that std

Edited by cossierick on 25th Jun, 2017.

are you well on the safe side for fuel and timing?
to late and or to rich can substantial raise the manifold pressure
might need to go external gate?

Bennys turbo crapped itself, Brett will probably know more as he was helping him tune it. And he sold up after his turbo went.

There was a thought of the timing being out loads if that could contribute to it !
The acctual megajolt is a safe conservative map on at the moment ! Fuel is rich enough

both extra fuel and safe timing will mean extra folow for the same amout to power... or more correctly less power for the same amount of flow...

I would thik you'd only be talking of 10-15% though, but thats a total guess.

could the internal wastegate be blocked somehow and an external fitted?

yep, not a hard job to tig a disc over the hole, also Ive seen external wastgegate take offs welded straight to the turbo so you wouldnt nececarylu have to mess witht he manifold.

Ohh that would work !

Im going to the turbo place tomorrow to see their thoughts on it

Thanks joe

no probs, I'm sure the std one can be made to work, but just in case its handy to know this shit LOL.

Rick and I talked about welding the housing up to give a larger flat surface then milling it flat and boring the hole larger. Then make and fit a larger flapper out of stainless. To make the internal larger.

I like that idea,

Ive been considering how I would get an external in if I get creep on my holset, i'd deffo give that a go first though.

Looks like you're OK on the bottom one, if it still creeps at that, it's going to creep no matter what...

What about at the other side of the waste-gate penny? There aren't any obvious obstructions in there that need to be relieved are they?

If something is worth doing, it's worth doing half of.

Had the die grinder in john and done as much as poss , the rest looks ok . Just need to try it again now

Do you think dave ? I'm not really sure what the hole to psi ratio would work out at ! Although it's bigger it's either going to make a missive difference or nothing at all

Edited by cossierick on 27th Jun, 2017.

well I am sure there is a fairly easy calculation for x flow through x hole, but as soon as you have that 90 deg tak oof fromthe main flow it goes astray, basicaly bang it on and fingers crossed.

just an idea..

rip all the internal gate stuff out hog the hole out something big and go with an external gate

need to actual copy and paste link to get it to work

http://www.atpturbo.com/mm5/merchant.mvc?S...tegory_Code=BCS

Attachments:

1.43mb

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Edited by Brett on 29th Jun, 2017.

Yes i moved to the darkside

Instagram @jdm_brett

the wastegate penny only just seated

if i had to do it again, i would maybe weld a 24/26mm penny onto the wastegate arm and bore to size
or
external wastegate it
when i had to slim down the turbo on the skyline to make it fit i welded up the wastegate and used a tial external
and still didnt go big enough

Yes i moved to the darkside

Instagram @jdm_brett

That should do the trick

Looking at it I'm wondering whether it would make sense to try to mount a larger flap further up. plenty of unused flat area there.

Are these turbine housings just cast steel?

Edited by minimole23 on 29th Jun, 2017.

No, they are not "just cast steel". I forget what it is, but they are a twat to weld in a high stress area, eg where already cracked.. They just keep recracking.
If you have it opened out, blended on the inlet to the hole, and non restrictive downstream of the hole (easy to overlook) you should be good to go,,,