2.5 shor stroke engine, my plans Options

[michel richard]

So here's what I'm doing for the engine as part of my "GT style" conversion. First and foremost, I figure that an engine in a GT style car has to be rev-happy.

So, here's what I'm putting together, with the help of my trusty wrench, Ron Green of Campbell Gararge in Montreal:

Short stoke 2.5 Porsche engine:

1) Used 7R engine case, align bored, Timeserted, shuffle pinned
2) 90 mm JE pistons, 10.5 compression ratio
3) 90 mm replated Nickasil cylinders, sourced from EBS
4) Standard piston ring set
5) 66 mm counterweighted crankshaft
6) GE 80 camshafts
7) EBS racing valve springs
8) EBS valve spring retainer set for above
9) 2.0 connecting rods
10) ARP rod bolts and nuts for above
11) twin plugged heads
12) Electromotive HPV twin ignition
13) Turbo lower valve covers
14) front mounted ol cooler with "GT Style" installation
15) new bearings and gaskets all around
16) miscelaneous engine parts, stock.

I still need to figure out what to do with the port sizes in the head. The target is to have a 8,000 rpm redline, and 250 hp, although the redline is more important than the hp to me.

So that's the plan. I pulled the trigger on the hard parts above today. ( I already have the crank and the miscelaneous parts).

Induction is going to be 40 mm PMO carbs, jetting to be determined.

I'll post to this thread as progress is mad on the engine.

Michel Richard

[Brett W]

The SDS can't be setup to run in sequential injection, doesn't datalog to a laptop, can't interface with a laptop, and ghettos its way through several functions.

For example how can you tune an engine if you can't overlay read outs from a REAL wideband O2 sensor, map, tps, rpm, ect, iat, duty cycle? It would take all day to scan through a little screens worth of data. Where I can layup all of the fuel tables and ignition tables in 2D or 3D graph and quickly compare all data points without scrolling through single numbers. I can analyze trends quickly and make adjustments. Saving my customers money and time.

The SDS has no limp mode, no safety overides, can't effectively control Variable valve control and variable intake manifold operations, can't handle any pulse width modulated signals for devices utilizing such signals, no adaptive capabilities, no system diagnostic feature, etc.

For vehicle owners looking to upgrade to a simple fuel injection system and leave it alone, it may be OK, but I certainly wouldn't push it for any of my customers.

Is Autronic, Motec, Megaquirt, Hondata, AEM, etc the answer for everyone? No but they are better than the Simple Digital Systems. Your right, I have never, nor do I intend to waste my time and money with a system that will not do exactly what I need it to do.