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The beginning of GTA Stradale build...
And from now on the project become really serious.
That is my approach on building 155 GTA Stradale nowadays and beginning of documenting it here :). The project will be executed by ICI Design, a well known tuning specialist here for Delta Integrale and alike models sharing same engines, drivetrain and not only.
Starting with the hearth of the car - the engine and in particular the bottom end of it.
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ZRP billet 4340 steel crankshaft for standard 90mm stroke
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That is a lightweight design with all counterweights, balanced to 1gr/cm with report included and many good manufacturing features.
JE Pistons asymmetrical 9:1 CR pistons from 2618 T6 high tensile forged aluminum
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As this have to be a modern build I decided to go with more up-to-date static compression ratio than standard one of 8:1. And expecting better fuel, power and thermal efficiency with it.
MaxSpeedingRods H-beam 4340 steel connecting rods
ARP2000 rod bolts (included with rods)
King Racing XP-series main bearings
King Racing XP-series connecting rod bearings
Custom engine girdle plate
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Engine assembling continue
I haven't updated since long time, so here is such about head and engine closing.
Cylinder head have been serviced by head specialist with new bronze valve guides and 3-angle valve seats job. It have been ported by ICI Design
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Valves have replaced with:
- Supertech black nitrided intake valves
- Supertech inconel exhaust valves
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- camshafts have been replaced with new intake and exhaust ones for Tipo 2.0 16V Sedicivalvole
- Athena racing MLS head gasket
- ARP M12 head studs
- adjustable cam wheels for fine tune of valve timing
- balance shafts have been removed
- 22mm width timing belt
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Turbocharger and exhaust manifold
Next will be the source of power - turbocharger and exhaust manifold on which is mounted.
As this is a modern build, then have to be used modern turbocharger. I haven't considered at all popular and easy to install options for upgrade from time when this and other models with same engine was more popular used cars let say like T3 or T34 variants from other cars like Cosworths for example or hybrids. The technology in general have moved on a lot in the last 10-15 years let say. Basically the choice came down to one turbocharger from two modern turbo series - Garrett G25-660 and Borg Warner EFR7163. Then G25 was newly released and there wasn't much real life info about them, but its data for given size look impressive. On the other side EFR7163 was available from some time and there is good reviews for its performance. After some research my choice fell on EFR7163 with T4 twin scroll 0.80A/R turbine housing with internal gate.
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That is best responsive version of it and with internal gate and integrated compressor recirculated valve, plumbing will be simplified and close to "like original" look. Here is a official information about that series of turbos -> EFR Technical Data
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And one good explanation video
https://www.youtube.com/watch?v=EIHQDw0mBV0
For mounting of that turbo was made custom tubular twin scroll manifold with as close as possible equal length runners .
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Twin scroll turbine housing and exhaust manifold have many benefits in low and mid rpms and that approach is used on many modern turbocharged vehicles.
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Assembly process in the engine bay
Now some pictures from assembly work in the engine bay.
Front subframe have been cleaned and painted before installing it back.
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Some pictures from work on exhaust manifold
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Some more pictures related to engine assembly and not only
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Turbo installation and not only
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Downpipe have been wrapped, but exhaust manifold will stay exposed.
Aeroflow big cone air filter with length of 230mm is located at lower left on front of car with short, straight route to it.
Intercooler piping are custom made stainless steel as can be seen from photos.