More torque for V8D1

[nsgnomad]

Hopefully all you guru's out there can give me a bit of advice. I own a 3.9V8i (auto 1996) recently converted to LPG. I have almost completed my 6500 km trip towing an 18ft caravan (about 1700kg) and this has highlighted that my D1 could do with a bit more torque to handle the towing. There doesn't seem to be much loss of power on gas compared with petrol and as it's only got 146k on the clock the engine is still in pretty good condition. But I have wondered if there is any fairly inexpensive fixes for this.
I have thought maybe
1. A snorkel to improve air intake temp.
2. A better (larger, free flowing) exhaust
3. Perhaps putting a longer throw crankshaft but this will of course be much more expensive.

I would appreciate any comments, particularly on the crankshaft replacement - will a 4.0 or 4.6 one fit straight in?

[shorty disco]

wat about a new camshaft?

[jazzaD1]

or an m90 supercharger will surely give you the increase in torque you are after

[Slunnie]

Would the cost of supercharging be comparable to stroking?

[jazzaD1]

i suppose it depends on how much fabrication of mounts etc you can do yourself, and a megasquirt conversion would certainly be a help to prevent the engine leaning out

stroking a rover v8 can get expensive, it may even be worth buying a 4.6L and swapping it in instead of fiddling with the current 3.5

[shorty disco]

CAPA : Supercharger Kits (http://www.capa.com.au/kits_landrover.htm)

decent price i would say.

[Slunnie]

i suppose it depends on how much fabrication of mounts etc you can do yourself, and a megasquirt conversion would certainly be a help to prevent the engine leaning out

stroking a rover v8 can get expensive, it may even be worth buying a 4.6L and swapping it in instead of fiddling with the current 3.5
I think we must have typed at the same time. I would have looked at supercharging. I'm gathering the cost would be similar but with more gains.

[mike 90 RR]

CAPA : Supercharger Kits (http://www.capa.com.au/kits_landrover.htm)

decent price i would say.

.... Holy snappin duck's nuts ..... That's a serious load of spondula :eek:

I'll wait for a wreck to come on the markets ... :)

[V8Landy]

Hopefully all you guru's out there can give me a bit of advice. I own a 3.9V8i (auto 1996) recently converted to LPG. I have almost completed my 6500 km trip towing an 18ft caravan (about 1700kg) and this has highlighted that my D1 could do with a bit more torque to handle the towing. There doesn't seem to be much loss of power on gas compared with petrol and as it's only got 146k on the clock the engine is still in pretty good condition. But I have wondered if there is any fairly inexpensive fixes for this.
I have thought maybe
1. A snorkel to improve air intake temp.
2. A better (larger, free flowing) exhaust
3. Perhaps putting a longer throw crankshaft but this will of course be much more expensive.

I would appreciate any comments, particularly on the crankshaft replacement - will a 4.0 or 4.6 one fit straight in?

Free flowing exhaust will help a small bit. I am looking at doing the same thing but am going to put a high torque cam in(next cheapest). I will price a stroker kit but think this will be more expensive. Then there is supercharging woul be nice but expensive.

[jazzaD1]

yeah i suppose it can become expensive, although ive already done the megasquirt conversion and dont mind knocking up a few mounts so it would be way less expensive than a capa kit

also the capa kits are centrifugal superchargers (like a turbo with a belt driven compressor instead of using the exhaust gases) their characteristics are more like those of a turbo in that they need to spool up to get to the sweet spot

the m90 is a roots style supercharger which has a fixed displacement, 90 cubic inches per revolution so the pressure increase is always the same no matter where in the rev range, assuming it doesnt choke the engine (hard to do with a 3.5)

the roots style has the advantage that it produces instant boost off idle, and hence much more low down torque, a downside is that they are usually mounted in place of the intake manifold which means intercooling in that setup can be a challenge, if i were to do it (and i am, just waiting on a good deal for an m90 from US ebay) i would make up a bottom plate that adapts to some 2.5" piping and run the supercharger off to the side, possibly above the passenger side exhaust manifold, you can run them sideways or even upside down if that is easier to work, then you just run the outlet from the intercooler straight into the current intake manifold, so you eliminate the problem of getting an even distribution of air into each port

although with my EDIS coil packs and LPG injection it may take a bit of working out to get it all to fit in the engine bay, its getting cramped in there now

but before all that i will be getting a cam from Tighe cams that produces more low down torque and a stronger midrange, my stock cam is stuffed anyway (worn lobes) and my lifters rattle like nothing else so i can maybe justify it as 'maintenance' haha
IIRC, the price from Tighe was $280 odd with a 3 day lead time, and Holden v8 lifters fit just fine in place of expensive rover items

[Pedro_The_Swift]

which profile are you going with Jaza?

[jazzaD1]

id have to double check but i think it was the 300 or 422A, id have to call ivan again, it was a few months back

[Traco]

My suggestions are:

3.9 petrol - high torque cam (RP4 or similar), tin head gaskets to lift compression, clean up heads around back of inlet valve seats for more flow (not too radical), fit freer flowing 2.25 (if auto) or 2.5 inch (if manual) exhaust from Y back (but keep OE downpipes), advance your ignition timing slightly, use premium fuel.

The ultimate fix is a 4.6 high compression conversion with all the above (except keep the composite head gaskets if you're using 29cc heads) plus a Tornado ECU chip. You can get 300+ftlb of torque with this set up with buckets of toque low down and then a huge boost at 3krpm when it comes "on" properly.

[Disco95]

My suggestions are:

3.9 petrol - high torque cam (RP4 or similar), tin head gaskets to lift compression, clean up heads around back of inlet valve seats for more flow (not too radical), fit freer flowing 2.25 (if auto) or 2.5 inch (if manual) exhaust from Y back (but keep OE downpipes), advance your ignition timing slightly, use premium fuel.

The ultimate fix is a 4.6 high compression conversion with all the above (except keep the composite head gaskets if you're using 29cc heads) plus a Tornado ECU chip. You can get 300+ftlb of torque with this set up with buckets of toque low down and then a huge boost at 3krpm when it comes "on" properly.

And what do you need to do with the ECU for all this?

[Boxer]

After having a good look inside my engine while the heads were off, my 3.9 is still pretty good. Eventually when I can scrape 3 mins together I'm going to make up a turbo manifol for the passenger side and a cross over pipe from the other to feed it. Turboing it shouldn't be too expensive.

[klappers]

After having a good look inside my engine while the heads were off, my 3.9 is still pretty good. Eventually when I can scrape 3 mins together I'm going to make up a turbo manifol for the passenger side and a cross over pipe from the other to feed it. Turboing it shouldn't be too expensive.

You just said the magic word.... TURBO :vampire::vampire::twobeers::twobeers::arms::arms:

https://www.aulro.com/afvb/images/imported/2009/02/1271.jpg

[Traco]

And what do you need to do with the ECU for all this?

Fit the Tornado EPROM chip developed by Mark Adams. It can be tailored to your exact engine specs though chances are, having produced scores of these for RV8 hot wire systems over the years, he'll already have the correct configuration programmed off the shelf.

[dirtdawg]

You just said the magic word.... TURBO :vampire::vampire::twobeers::twobeers::arms::arms:

http://www.tweakit.net/shop/images/garrett_gt3040r_sm.gif

lol like disco fuel econemy isnt bad enough lol :p