75 1.8t turbo characteristics

[E_T_V]

Originally Posted by Biggee63

A final thing that sometimes shows itself with these engines seems to be 'harsh lift off at load'
For example, say 2nd gear full throttle to 5500 rpm execute a quick gearchange to 3rd
do you experience a jolt?
Try from 3rd gear, full throttle to 5500 rpm, quick gearchange to 4th, still jolt?
3 to 4 gearchange test best done on private road though.

I hope that helps with the diagnosis.

Sounds like you are getting boost cut from a lazy boost control valve as that certainly isn't normal.

I'd be checking the boost levels to see what you are getting.

[danbmx_69]

Originally Posted by E_T_V

There is virtually no turbo lag as the turbo is so small. You are getting full boost before about 2500rpm which makes them almost diesel like to drive. There is no point revving past 5500rpm which makes them a bit dull to drive to be honest.

maby you should try mine

[Cockaa]

Mine is very lively & it's not remapped, yet! Nearly there Dan

[Biggee63]

Originally Posted by E_T_V

Sounds like you are getting boost cut from a lazy boost control valve as that certainly isn't normal.

I'd be checking the boost levels to see what you are getting.

Didn't say I was experiencing the problem, just giving an idea of what can happen.

If yours is a 1.8T do the test & see what the results are and please let us know.

[E_T_V]

Originally Posted by Biggee63

Didn't say I was experiencing the problem, just giving an idea of what can happen.

If yours is a 1.8T do the test & see what the results are and please let us know.

It is indeed and I don't get such issues. I did have similar issues until I bypassed the boost control valve though (I was getting boost cut as the turbo spooled and the valve wasn't reacting fast enough to control the boost level).

[E_T_V]

Originally Posted by danbmx_69

maby you should try mine

Ok I should have said standard mapped cars

It should be more lively once you remove the de-tuned map

I wonder if there is anything to be gained looking at the cams too as I'd guess they are setup for low down grunt rather than top end pull., (unless they were something out of the parts bin of course!)