Gtb twin turbo engine problem

[Gtbdenz]

hi I have a 2litre gtb twin turbo jap import but as soon as I Rev to 4500rpm it shakes the car and doesn't go any further and the speedo has also stopped work does anyone know what the problem is cheers

[WideSam]

Boost leak somewhere? That's about the point you'd be having the second turbo kick in...

[Tlag]

The engine running out of steam at 4500rpm does sound like boost or fuel cut but why it should make the whole car shake is beyond me.

Read the ecu codes first. That's always the first step with any running problems. It should at least point you in the right direction.

Which generation GTB is it?

[Gtbdenz]

It's 1998 bh5 5 speed manual it's weird as it won't go past it in any gear but why would the speedo also stop?

[Tlag]

to allow these cars to read in mph instead of kph, a converter chip is fitted (usually behind the instrument cluster). It's not unheard of for them to fail which would cause the speedo to stop working. However, that would be a bit of a coincidence, for it fail at the same time as the revs stopping at 4500rpm.

As I said above, read the codes stored on the ecu first. If the car is totally new to you and it's always done this since you owned it, read the codes, make a note of them, clear the codes and go for a drive. Then read the codes again. The reason for this is that you may have stored codes from a long time ago that are no longer applicable.

[5heffield 5ubaru 5ervice]

The first thing I would do is rectify the speedo issue as the ecu needs a vehicle speed signal from the speedo. If it is anything like Imprezas this will more than likely rectify the 4500 rpm problem.