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

[Mark Henry]

QUOTE (Brett W @ Dec 22 2005, 01:23 AM)

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.

Almost everything you said falls into the "who cares" department

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sequential injection,

Very few cars run sequential injection, very little is gained by this. You forgot it’s also batch fired…again very little to be gained.

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Doesn’t data log to a laptop,

This is the one I hear all the time....who cares besides techno geeks.
Sure it might come in handy on a high-end racecar, BUT a streetcar??? Come on. Just run the damn engine!

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Doesn’t data log to a laptop

,
again see above.

PLUS your behind the times as SDS got sick of hearing these lame reasons, gave in and you can now download for data logging.

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and ghettos its way through several functions

.

That’s a broad paintbrush with no substance...please explain the things it ghettos its way through.

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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?

In about 10min with no dyno....I counter-point that how can the average person tune with all this clutter (and dyno time).

The average person is so over whelmed with information overload that they shy away from PEFI systems. Look at Michel here on this thread, I've told him that the SDS will start right up, within minutes I'll have the A/F dialled in (not that I'll have to tweak it much from the pre-loaded base line), BUT still he wants to break it in with carbs.

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It would take all day to scan through a little screens worth of data.

Again the systems you use are not user friendly. Fast scrolling did take a day or so to learn all the tricks, but once you get the hang of it it's very easy.

In a race app I could make a major engine change and be dialled in good enough by about the 3rd corner. Can you say that?

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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

.

Again more clutter that boggles the end users mind....not to mention as I said SDS now has data logging.

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Saving my customers money and time.

I'm sorry but this is the biggest laugh! How do you save them Money! With dyno time? With a system they don't have a clue how to tune?
Please, it makes you money every time they have an issue because they can't figure out (or a just plain too scared to) how to fix it themselves.

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The SDS has no limp mode

Doesn't need it. Besides water damage and a couple of the old style coil packs the only failures they've had have been user error.
For me 4yrs (2 engines, sold one) and I've never broke down.

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can't effectively control Variable valve control and variable intake manifold operations,

Please again...what engine are we talking about?? I agree that if your running a V-tec or vario-ram this isn't the system for you, BUT in our apps this a TOTALLY USELESS feature.

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can't handle any pulse width modulated signals for devices utilizing such signals, no adaptive capabilities,

Many systems can't handle every single system out there...you should always check to see if your components are compatible. As far as Tach's and MDS it's plug and play, no moduails to buy.

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no system diagnostic feature, etc.

Almost every time SDS gets a return there's nothing wrong with the system. If there is something wrong it's a fried board because the user swapped the +/-.

I'm not saying SDS is the best system, as I don't think there is a "best" system. The biggest beef I have is the the SDS requires a bunch of in-line fuses that are not included, to me they should already be on the harness. Minor I know, but they just should be on it already.

I'm just pointing out some of your preconceptions are wrong and stating that a system sucks without ever having your hands on the system is just hear-say with no basis in fact.