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FastWoman

Efficiency potential of the L28 (MegaSquirt)

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Incidentally, the option to use sequential injection becomes more significant when the engine is N/A and has a lot of cam.

I ignored that, just figured the real loping idle was OK until Holden Special Vehicles Co brought out their variant of one of the LS V8's using sequential. Hmmm, decent idle yet this thing cranks out 420hp net from 5.8 litres???

Took some time getting everything else right and the L28+ still doesn't purr like a kitten but it sure is better.

Even more so on the L29+ with ITBs and stupid cam profile.

The cams in the GM LSX V8s have very little overlap and that's why they idle as smoothly as they do (stock). I doubt if you could find a cam like that for an L series. Maybe you could have one custom ground. If you could I'm curious how that wold work with the aforementioned 37+ year old engine design. Edited by sblake01

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It may be a 'dead horse' on Hybrid but except for a couple of sideracks (what else is new?) we're just trying to continue with Sarah's thread.

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It may be a 'dead horse' on Hybrid but except for a couple of sideracks (what else is new?) we're just trying to continue with Sarah's thread.

Oh, that's alright. There seems to be a lot of beating all around. I didn't really want that.

But I think I got my questions answered. I'll study it further on my own, and when the weather gets cooler, I might decide to take on a project. Dunno. ;)

Thanks, everyone! :)

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Re 2) what serious engineering to "retro fit"? The injectors are exactly the same parts as used in a non sequential system, the difference is entirely in the ECU and wiring. Any other suggestion is leading interested people astray.

Wrong again.You need to retro fit a cam position sensor..

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sblake - that is only correct for the soft American market engines. HSV variants have significant overlap

Z train - it's actually simple enough to create a cam position sensor that one can almost do it with hand tools. Have a look at the simplicity and advantages of a 50/50 sensor in an old distributor body (which can even be lifted from a four cylinder)

Hopefully FastWoman has gained enough encouragement and seen there's so many opposing opinions that she will research deeply and go for it.

edit:

posted this on JB's forum a while back, it should help some

http://forum.jbperf.com/viewtopic.php?f=2&t=467

Since that post I've dumped the TechEdge WBO sensor interface and switched to a SLC/OEM from 14point7.

Main reason for the change was getting rid of the analogue > digital > analogue > digital chain and go to analogue > digital with the result sent over I2C to the IO/X as a data stream for forwarding to the MS3 via CAN.

Edited by aarc240

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Wrong again.You need to retro fit a cam position sensor..

Which, with your skill set, you consider "serious engineering". Very telling.

Steve

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sblake - that is only correct for the soft American market engines.
Precisely why I don't have the stock cam......:)

(If others still wish to argue about sequential injection, etc., then I can talk about LSX engines)

Edited by sblake01

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Seems to me everyone is overlooking the obvious. You are trying to prepay for fuel economy. You've been watching too many Prius commercials.

If gas is $4.00 a gallon: The car gets 22 mpg, that is 18 cents a mile. At 30 mpg, it is 13 cents a gallon. Driven a 1000 miles, you have saved $50. At the cost of the $1000 megasquirt system, you need to drive 20,000 miles to reach the break even point. How likely is it that you will drive your Z 20,000 miles?

If your goal is to improve fuel economy, it is a fools errand. You will spend everything you are trying to save, if not more.

My 280 gets 22-28. It is what it is. No complaints at all. My Benz gets 17. It is what it is. My 240 is STILL on the rack. It too is what it is........ : (

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Seems to me everyone is overlooking the obvious. You are trying to prepay for fuel economy. You've been watching too many Prius commercials.
Not everyone...........;) Edited by sblake01

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The move to MS is justified by the huge increase in system tunability, not a gas mileage increase, that would be a bonus. You can put in as much fuel and spark advance as you want at any point of your engines operating curve with the press of a button.

And since when does MS cost $1000? You can put together a system at less than half, maybe even a quarter of that price depending on the hardware you get.

Edited by LeonV

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Precisely why I don't have the stock cam......:)

Your car list tells me you have a VZ Holden Monaro CV8, well a detuned version anyway (aka 2005 Pontiac GTO).

You'd be in 7th heaven if you had access to the stuff fitted standard to them over here, let alone the aftermarket and HSV variants

Edited by aarc240

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Seems to me everyone is overlooking the obvious. You are trying to prepay for fuel economy. You've been watching too many Prius commercials ...

Now don't go and spoil the fun, the other half hasn't yet got wise to the real reason!

Edited by aarc240

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Your car list tells me you have a VZ Holden Monaro CV8, well a detuned version anyway (aka 2005 Pontiac GTO).

You'd be in 7th heaven if you had access to the stuff fitted standard to them over here, let alone the aftermarket and HSV variants

I've had the car for almost three years and I've done lots (and I don mean lots!) of research on it. I'm well aware of the differences between the CV8 and the U.S. Pontiac GTO. Mine is not stock. Some of the aftermarket goodies I have in mine actually did come from over there (JHP Vehicle Enhancements) I could go into detail but I think that would be more appropriate on the GTO/Holden sites that I spend time on. My only point for commenting on the LS engine in the first place was to realate how they achieve a smooth idle here in the U.S. Let's get back to Datsuns..... Edited by sblake01

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How else would you go about squeezing efficiency out of the L motor without going to internal engine work? Skinny tires, remove the side mirrors, driving habits, AND a modern engine management system? If it's not your daily driver, then don't bother because the payoff will be pretty far away. However, if you want to have fun, learn a ton about IC engines, and push your tuning skills into power and efficiency, an engine management system that is programmable, is an ice cream sundae.

Do it because it's there. :)

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