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Easy power on turbo lux's
Posted: Sun Mar 22, 2009 6:51 pm
by Outer Limits Hilux
G'Day all
Just doin a bit of talking around about turboed 2.8 luxs. The reason why they dont respond too well to large amounts of boost (15 to 20 psi) is because the engines run such a high compression ratio.
To resurrect this prob is easy, maybe too easy. was thinkin, if you got say 3mm copper sheet, (quality grade) and an old head gasket, you could take them to a laser cutting shop, cut it out and put that in instead. it would def lower compression ratio which in turn could run more boost. a simple compression test would show results.
Yay or Nay??
Posted: Sun Mar 22, 2009 7:26 pm
by macca81
could work... in theory it should.......... give it a go and tell all about how it goes!
Posted: Sun Mar 22, 2009 7:34 pm
by brad 93hilux
just a question, since a diesel uses compression (and heat) to ignite, wouldn't putting in a 3mm gasket lower it too much at idle so that it may not run properly?
I know with the turbo on 20psi boost, the compression will be high but with out the boost when the compression drops to idle is where i thought it might cause problems?
Just a idea. i have no idea
Brad
Posted: Sun Mar 22, 2009 7:53 pm
by Z()LTAN
It will only be a problem when cold, the glow plugs wont work as well so youll need to glow it more than usual.
Once runing the cyl temps are enough to create the correct detonation timing.
Posted: Sun Mar 22, 2009 7:59 pm
by 80's_delirious
lowering the compression ratio will mean it will be more gutless at low rpm until significant boost is produced. Also less engine braking when going down steep hills
Posted: Sun Mar 22, 2009 7:59 pm
by howesy
Sitting here scratching my head. I had a 2.8 hilux with a DTS turbo running max 9lb boost and it drove like a petrol car went fantastic. Just buy a V8 and do the conversion. Seriously mine went real well maybe you should look at who set up your injector pump.
Posted: Sun Mar 22, 2009 10:27 pm
by redv8lux
I've got the v8 conversion an a mates got the gutless 2.8
when he's flatout in top gear i'm just starting to think about changing into 3rd,
Mine seems to have just as god engine braking on hills an will out pull his anyday of the week
Best value way of getting more power out of the 2.8 is to convert to v8
Posted: Tue Mar 24, 2009 7:16 am
by Sic Lux
brad 93hilux wrote:just a question, since a diesel uses compression (and heat) to ignite, wouldn't putting in a 3mm gasket lower it too much at idle so that it may not run properly?
Brad
Run boost at idle
be alot like the 2stroke diesel
Posted: Tue Mar 24, 2009 8:10 am
by 302 cruiser
be nothing like a 2 stroke diesel
Posted: Tue Mar 24, 2009 11:56 am
by big_fyt
changing the compression on a diesel kind of defeats the purpose of having a diesel correct?
Re: Easy power on turbo lux's
Posted: Tue Mar 24, 2009 2:39 pm
by -Nemesis-
Outer Limits Hilux wrote: The reason why they dont respond too well to large amounts of boost (15 to 20 psi)
Do you mean you wound up your boost and it didn't give the gain you had hoped?
My guess is with that much boost you're sending in hot air from an overworked turbo. Heat is your enemy with boost on any engine.
If you want 20psi, run a big turbo and big cooler. If you throw a compressor of any sort out of it's efficiency range there's a good chance you could even lose power with too much boost, because of the hot air density.