jay26

as above what is safe to run in psi or bar.

p.s. as far as im aware its all standard conversion parts on the car at the mo

johnenright150rst

got a 2.0l zvh mainley standard bottom end with skimmed pistons and im runnin around 10-12 psi been told that with skimmed pistons no more than a bar of boost (14.7psi) if the pistons are standard probley arond 3-4 psi
hope that helps which makes 175bhp 205fpt

jay26

all info helps mate cheers

do you know what the slim pistons are from or a part number

fezzaturbs

3-4 psi on a 2.0l zvh? standard frst run 7-8 psi... n 16 psi wit a stage 2 chip n beige injectors n obviously -31 actuator n ugraded fuel pump as mine is set so surely u could get more than 3-4 psi outta standard 2.0 zvh?

clarke5700

you dont want to be aiming for how much boost you can run you want to be looking at the power out put.

one engine mite make 200bhp at 15 psi yet one with a ported head mite make 200bhp at 12psi

xr2wishy

iTrader: (2)

that is quite a low reading of power for the boost on a zvh.

i'm running/was running 11psi and just shy of 200bhp on a 1.8 on skimmed early pistons, as they have thicker crowns than later ones or the 2.0 pistons.
15psi is said to be fine, but i know a guy running 20psi on a 1.8zvh silvertop with skimmed pistons and he puts his on track and is still on the first engine, kicking out 318bhp with NOS on top of that.

fezzaturbs

nice. i should be around 200bhp in my frst but on wat boost i wont no till rollin road but at min im runnin 16 psi as recommended for my spec but it might want tweakin down coz dont wanna run more than 200 bhp. im thinking 14 psi n ill b bout rite

xr2wishy

iTrader: (2)

the general info i've been told about on zvh's is that 11 psi or there abouts should give 200bhp(ish) on a CR of around 8:1
very general i know, but a frst LUK clutch can't hold the power/torque back on 10.5psi of boost and they're usually good to 180-190bhp and what ever torque may be applied to that.

fezzaturbs

lol tell me bout it. 1st thing i hadda do after stage 2 n biger turbs etc was clutch, then fuel pump. gear box next i think. lsd

Chip

iTrader: (3)

30psi wont damage your engine if its fuelling right and not detting or running high EGT's

But 0psi with the wrong fuelling and timing could easily kill it.


Boost really is NOT the critical factor in setting up an engine, as clarkey mentioned.

jay26

etg ? sorry im new to all this

also i have one of these compression testers ( pic below) what would be a good number for a 2.0 zvh p.s this is urgent please help

xr2wishy

iTrader: (2)

compression would be good from 130 to around 200, there is no definite as it's all determined by the seal in the valves and tight tolerances in the rings.
egt is exhaust gas temperature which if too high can melt pistons/wreck the turbo.

Chip

iTrader: (3)

Cam spec will massively vary the reading you get from that.

xr2wishy

iTrader: (2)

/\ they are only good to make sure engine wear is consistant throughout the cylinders.
so compare results of all the cylinders to each other, not an ideal reading to aim for, although if too low i'd be concerned.

jay26

it was wher the big number nine would be across all 4

xr2wishy

iTrader: (2)

seems ok that, i'm guessing engine was cold at the time though.

jay26

yep it sure was