Ok where to start.
Firstly one turbo is perfect we route the rear pipe back to the front on the cam belt side with a collector just after the front manifold outlet and root the outlet between the motor and gearbox where the front down pipe would normally go. A 3inche pipe fits without a problem.
My honest opinion is that adding a turbo to the v6 will be cheaper and you still have a motor running oe management when not boosting so it stay as economical as before if you behave.
We do not change the motors internals since they can take close to a bar boost as is and 0.5bar normally produce more power than what you can use close to +/-300bhp on a 2.5.
Fueling is sorted with a 7th injector preferably 1000cc run by a standalone management that can be set precisely according to the manifold pressure.
You can get prices on the following items for costing purposes.
1. Turbo should be something in the old T4 range not going to do matching for now since it is just a basic costing exercise and turbo’s depend on your budget.
2. External ware gate no smaller than 35mm
3. Intercooler of about 400mm x 200mmx100mm
4. 1000cc injector
5. We use Gotech mini x to drive it +/- R3000.00 SA rand
6. High pressure oil fuel pipe for turbo.
7. Backflow fabricated on sump as high as possible.
8. More pipe for the back flow.
9. Silicon boost pipes
10. Obviously clamps
Assortment of other bits and a lot of time but you can do it yourself.
On the 3.0 with +/- 0.5bar boost you should have in the region of 340bhp.
I am a bit cash strapped at this stage so my GTV is standing. Things went wrong and we were forced to deviate from our normal setup with her. But with low fuel pressure and les than 0.3bar boost she already made 220whp below 4000rpm we couldn’t up the boost or rpm at that stage thanks to a faulty FPR.
This motor is actually a 2.8 24v and not a 3.0 anymore thanks to engineering stuffing up my 3.0 crank but all internals are oe as with our other cars.
You can look under turbonutters on You tube and will see a 2.0 and white 2.5 156 both bolt on turbo’s the 2.0 making 253hp and the 2.5 228hp if I remember correctly.
Before anyone ask why the TS makes more it is because we are boosting it more than the 2.5.
I know of a 156 2.5 driving around with a turbo boosting 0.5bar without any fuel or timing changes the oe system are extremely flexible and can compensate a lot more than we think.
Although the car doesn’t really make proper power since it wants more fuel it is not self-destructing. Personally I will not do it but I am thankful that another clown proved that it can be done.
With the SA rand value so low at this stage we should start manufacturing all the pipe work and ship it to you.
Who are in the export import business?
My GTV turbo but it evolved over time and should produce in the region of 600bhp when it is finished I really do not know when thanks to the economic situation.
On this pick you can see the pipe coming from the rear bank.
Under the bonnet of the TS turbo on you tube
More picks of the GTV Turbo but like I said it got out of hand but the basic outlet setup stays the same on the other cars.