Stu...yes i forgot about the surge issue...i can see why Jims car is at its maximum with a T4....its only running about 26psi aint it????I would concur that this is the most you could run one at on a std engine....hence again a very strange conversion ...A T4 should only be used if you want proper bhp..therefore having a ported head proper cams etc at utilise the big ole turbo.

 

At last Phil, you said something that we can all agree on

T4 Turbo's ROCK

 

So it works? Someone show me how it works and il do it

 

dunno does it? someone show me too and i'll do it.

 

Hi Guys,

Sorry for not being around to thank everyone for their ideas, but I'm on a ship, somewhere off the Alaska coastline.

Anyway, Mike is correct, I still have standard cams in at the moment.

My decision to go for a T4 conversion and standard comp engine was two fold.

Firstly I could always use the T4 on a later more powerful conversion. (This was always an interim engine, and the reason it was done was to utilize my low milage engine, and use items that I could utilize in a later more powerful engine).

The engine is very well spec'd with regard to the ancillaries being capable of a big output engine, but at the moment I totally see the reasoning behind a T4 standard comp engine. albeit that to get the most from it, i need to have the head ported and a set of appropriate cams.

So far I'm very pleased with Karls suggested specs, and the only reason it isn't doing as promised is that the Turbo (T4) that "I" got and fitted, was available at a give away price (Relatively) and had just been fully rebuilt. What I didn't realize and didn't check before i fitted it, was that it is certainly a hybrid, and was advertised as such. It appears that the Exhaust wheel is cut back as is common practice on a T4 for a 500bhp engine. This obviously dosn't suit my engine at the moment, and I'll have the Turbo checked out by one of the turbo guys to see exactly what's been done. The good news is that the Turbo is in as new condition, and I'll just have to get it re-specced to whatever Karl suggests. You never know, he might even agree to one of the suggestions made on this post.

Karl will also be fully porting the head and putting in some appropriate cams very soon, and with the Turbo re-specced I'm confident of getting the 400bhp and good torque lower in the rpm range than it is at the moment.

For the money that this interim conversion cost, I can assure you it's a very worth while conversion, especially as you can use all the parts on a later big output 450+ bhp engine.

Thanks for everyones ideas and comment.

The lack of torque and mid range punch is down to me buying a wrongly specced turbo, no one else.

But it's only a matter of sorting the cut back exhaust wheel, so expect the results soon.

 

Could someone post a picture of a STANDARD .63 exhaust housing to show the blades, so I know what I'm looking at to see how much mine have been cut back.

 

BTTT

 

BTTT