electronic replacements for the 2.8 K-jet system
Discussion
Just kicking this off for any info and ideas.
I've been looking at the idea of a megajolt/megasquirt for ignition control, especially now that the 2.8 engine doesn't seem totally at ease with this unleaded fruit cocktail they sell now. I came across a couple of US sites which do EFi Megasquirt ign AND fuel conversions for K-jet Audi and Mercedes engines, even down to little adaptor bosses for the injectors !
I know, we could go 2.8 Efi from the Granny, but these are very rare, so I wondered has anyone done anything like this to their 2.8 ?
There's bugger all chance of me finding a 2.8 Efi out here, although there is the odd 2.9 Sierra around.
Nothing against the V8 guys, but you were lucky enough to have electronic injection part already, from basic through to 'proper' full management... have any of you gone to digital (= non-dizzy) timing systems ?
Any experiences would be interesting to hear about
I've been looking at the idea of a megajolt/megasquirt for ignition control, especially now that the 2.8 engine doesn't seem totally at ease with this unleaded fruit cocktail they sell now. I came across a couple of US sites which do EFi Megasquirt ign AND fuel conversions for K-jet Audi and Mercedes engines, even down to little adaptor bosses for the injectors !
I know, we could go 2.8 Efi from the Granny, but these are very rare, so I wondered has anyone done anything like this to their 2.8 ?
There's bugger all chance of me finding a 2.8 Efi out here, although there is the odd 2.9 Sierra around.
Nothing against the V8 guys, but you were lucky enough to have electronic injection part already, from basic through to 'proper' full management... have any of you gone to digital (= non-dizzy) timing systems ?
Any experiences would be interesting to hear about
Also - there's all this stuff about whether you can fit a 2.9 inlet manifold to a 2.8 (and vice versa). Anyone know ?
From the sites I can find with pictures, the manifold gaskets look identical, but lots say it doesn't fit - the USA confuses things as they had a different port layout on their 2.8, which definitely won't fit ...
A 2.9 mfold gives a quick way into EFi ..
Yeah, wasn't all that impressed by Amethyst writeups, looks like a very small ignition map. Megasquirt just for ignition would be more flexible.
From the sites I can find with pictures, the manifold gaskets look identical, but lots say it doesn't fit - the USA confuses things as they had a different port layout on their 2.8, which definitely won't fit ...
A 2.9 mfold gives a quick way into EFi ..
Yeah, wasn't all that impressed by Amethyst writeups, looks like a very small ignition map. Megasquirt just for ignition would be more flexible.
I know that the US got heads with 3 exhaust ports, and those heads had different inlet port spacings too, so you would need the matching manifold. From web reports, they don't actually flow much better overall. Offenhauser used to do both European and US layouts for their manifolds, but now only do the US ones.
USA ones had a reputation for cracking, but I think that got fixed after a while.
I looked around for pics of the 2.8 inlet mfold gaskets, and you can see the difference between USA and Euro ones.
So for the Euro 2.8 versions, there is actaully a carb manifold, K-jet manifold, and an Efi manifold (Efi is rare...). Euro 2.9 were all Efi, but I think USA got some carb ones ? Anyway, European-wise, the 2.9 gasket looks identical to the 2.8, but manifolds don't interchange ?? hmmmmm.
Swaps - If I was in USA, I would be looking for a pushrod 4.0 version - they do exist, so I'm told.....UK companies use the 4.0 crank for the 3.5 stroker I think.
Self learning ? Nah... the whole point is to be able to fiddle with it !!!
And I've got other threads on engine swaps. That Lexus V8 looks good .....
USA ones had a reputation for cracking, but I think that got fixed after a while.
I looked around for pics of the 2.8 inlet mfold gaskets, and you can see the difference between USA and Euro ones.
So for the Euro 2.8 versions, there is actaully a carb manifold, K-jet manifold, and an Efi manifold (Efi is rare...). Euro 2.9 were all Efi, but I think USA got some carb ones ? Anyway, European-wise, the 2.9 gasket looks identical to the 2.8, but manifolds don't interchange ?? hmmmmm.
Swaps - If I was in USA, I would be looking for a pushrod 4.0 version - they do exist, so I'm told.....UK companies use the 4.0 crank for the 3.5 stroker I think.
Self learning ? Nah... the whole point is to be able to fiddle with it !!!
And I've got other threads on engine swaps. That Lexus V8 looks good .....
Yep - I'm always keeping an eye on valve clearances, as my engine doesn't have unleaded valve seats. Seems OK so far.
I set them just a little wider than spec, Cologne engines seem to like that (I've had a few)
Injectors are in good condition - I replaced them, and they haven't done many miles.
Timing is the issue really.
It DEFINITELY doesn't run right with vac advance connected, and retarding as recommended (9 degrees BTDC or even 6)
makes it feel flat. I've played with this a lot to get the best combination. I don't think the dizzy springs are badly worn, they look OK too (not too slack). Currently running 10 BTDC with no vac advance.
So - a digital mapped setup is what I am considering, but probably keep dizzy - you can't remove it anyway, as it drives the oil pump.
The cheapest and most able combination (functionality vs. price) at the moment does seem to be a megasquirt contolling
just the ignition (and then later on, might go full Efi)
I set them just a little wider than spec, Cologne engines seem to like that (I've had a few)
Injectors are in good condition - I replaced them, and they haven't done many miles.
Timing is the issue really.
It DEFINITELY doesn't run right with vac advance connected, and retarding as recommended (9 degrees BTDC or even 6)
makes it feel flat. I've played with this a lot to get the best combination. I don't think the dizzy springs are badly worn, they look OK too (not too slack). Currently running 10 BTDC with no vac advance.
So - a digital mapped setup is what I am considering, but probably keep dizzy - you can't remove it anyway, as it drives the oil pump.
The cheapest and most able combination (functionality vs. price) at the moment does seem to be a megasquirt contolling
just the ignition (and then later on, might go full Efi)
Found this looking around on the web - how to electronically control a K-jet system by replacing the WUR (warm up regulator) with a new unit, and then using a microsquirt to control fuel mixture.
Interesting idea....and I like the name !
http://www.frankencis.com/
and that gets you spark control too, if you want it.
Interesting idea....and I like the name !
http://www.frankencis.com/
and that gets you spark control too, if you want it.
Gassing Station | Wedges | Top of Page | What's New | My Stuff