immature, beginner, what ever you call it questions
Turbo Mini Forums

just few quiries

i have just checked through 'search' but i must be putting in the wrong words because i am not getting any answers

what horsepower does the DON run???
(i dont think this should be in this catergory but it saves opening another topic)

whats a good, nice, but safe amount of boost for a standard metro turbo engine, running a intercooler with the finned section measuring about 350x100x150mm??? also what sort of power would i be expecting (after a good needle tweak on the rollers)???

i was told there was once a metro at a friends old place of work running 156bhp on the rollers (unsure weather wp or flywheel power) and the only mod was montego turbo jet and needle and of course and interbreeder

thank you in advance
jack

Jack Jones

Edited by Rob H on 3rd Feb, 2009.

standard turbo with intercooler you dont wand to be going over 120 bhp
the drop gears clutch and box wont take it for long and thats about 11 to 12 pounds of boost ...ish

ive been told to run about half a bar as a safe amount on a good condition std metro engine, i wil be running 7 psi to get everything sorted and iron out any niggles in the setup then i will build my other engine up to a much better spec.

thanks guys

Jack Jones

PS- there is no such thing as "waste gate chatter" please alter your signature!!!!!!!

Yes i moved to the darkside

Instagram @jdm_brett

hey tom, this is why my questions are under immature and beginner, because i dont really have a clue, but alas i will try

what is the noise i am thinking of called???

Edited by just_jack on 18th Feb, 2009.

Jack Jones

Yes i moved to the darkside

Instagram @jdm_brett

change waste gate for Turbo and it will make more sense.

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

i had a word with a lad at work and it said the noise i am thinking of (which i first heard on his 620ti) is the throttle butterfly 'chattering' as the throttle is closed, after the turbo is nearing max boost

probably wrong again, but this is what i was told, any body shed some light???

Jack Jones

right. when you close the throttle from being on boost the air then hits the butterfly. correct.

it is not however the butterfly chattering. this air then has nowhere to go so it goes back down the charge piping straight into the spinning turbo.

this back flow of air then stalls the turbo.

it is this that gives you the noise. i am not sure if its the noise of the compressor wheel slowing suddenly or if its the blades of the wheel cutting through the air that is traveling through the wrong way.

it is however (deemed to be) bad for turbo life at high boost levels and this is the reason for dump valves being installed.

thank you james, very well explained

Jack Jones