Ghibli GT -96 Max Power

[F456M]

I guess his Spyder was with late 2L 220hp or 2.8 18v heads. 2.5 turbos where real small and not sure they were water cooled.
You don't need better chips: just move SEM restrictors to the Ghibli position, you'll get 1bar boost instead of 0.8bar. Not sure EFI 2.5 had late heads with two big intake valves. Also find a short 3.73:1 Ranger diff (your 2.5 is 4 bolt I guess so it's a Sensitork).

I'm convinced the 18v heads are almost as good as 24v ones, while they are much cheaper, smaller and lighter. Intake valves are smaller however ports and are larger than on 24v, intake seats are same size as on 24v. I'm currently rebuilding my 2.8 18v (222E) and doing lots of mods: forged pistons (about 8:1CR), bigger unshrouded valves (BMW 30mm), many changes. Stock turbos, they should be enough up to 320-340hp at 1.2 bars with a better mapping (stock ECUs). It's a fun (and expensive) pastime. Also bought the ASMotor struts.

He had the original turbos and had 320 hp. on the real wheels at 1,3 bar. They are bigger than those of the 2,0 18v. They are tiny small. That engine was taken apart in the early 90ies and ported and done many tricks to. The smallest intake valve was changed to one bigger than the big one! The "bottle neck" lately is that the injectors can't deliver enough fuel, so bigger injectors are soon going in. It runs out of fuel at only 5.000 rpm. He want it to run 7.000. Max torque is now at 5.000 instead of 3.500.

 

[alpa]

He had the original turbos and had 320 hp. on the real wheels at 1,3 bar. They are bigger than those of the 2,0 18v. They are tiny small. That engine was taken apart in the early 90ies and ported and done many tricks to. The smallest intake valve was changed to one bigger than the big one! The "bottle neck" lately is that the injectors can't deliver enough fuel, so bigger injectors are soon going in. It runs out of fuel at only 5.000 rpm. He want it to run 7.000. Max torque is now at 5.000 instead of 3.500.

I'd be curious to know what springs he's using to be able to rev up to 7000 rpm. In the 18v engine both intake valves are driven by the same pushrod, this means twice more pressure on the cam and pushrod than in a usual setup. Stock springs are weak (22kg new, less after yeasr of service) while the pushrod is very heavy. To me the stock exhaust valve springs are not stiff enough either.
Injectors are just a matter of price and remapping, there are EV14 and EV6 injectors of the right size.

 

[94massa]

Nice work - my 222 4V uses upgraded Garrett ball-bearing turbo's, grafted on to the IHI exhaust compressor housing. Bosch motorsport fuel pump, uprated fuel injectors, Turbosmart electronic boost controller custom designed and built alloy intercoolers and pipes, blow off valves, air intakes etc. With conservative tune and a re-mapped Magneti Marelli ECU it produces 574Nm

 

[alpa]

Nice work - my 222 4V uses upgraded Garrett ball-bearing turbo's, grafted on to the IHI exhaust compressor housing. Bosch motorsport fuel pump, uprated fuel injectors, Turbosmart electronic boost controller custom designed and built alloy intercoolers and pipes, blow off valves, air intakes etc. With conservative tune and a re-mapped Magneti Marelli ECU it produces 574Nm

What's the power and at what rpm ?

 

[94massa]

From memory, max tq was achieved around 5200. Very flat curve at the peak - max between about 4600 and 5200. About 330hp at the wheels which I think converts to around 380-400 ballpark. VERY conservative tune as the car was my daily at the time, and I have no interest in owning a hand grenade!! Super good tune for the street, and really punches above 3200.

 

[alpa]

400hp make sense on a 2.8 engine with small ports and valves.