Dyno results

[karl_760ti]

Ok,got my volvo dynotuned today.

Pumped out 100.6kw at the back wheels. Car is a 85 760 turbo,with z31 turbo an straight thru 3" exhaust running lpg. Pushin 9.5psi with a Automatic(zf).

Cheers Karl

[striknine]

100.6 kilowatts = 134.906822 horsepower says google, for those wondering :D

But..Curious...Isn't the stock HP figure for a 760 turbo supposed to be around 140-150? I'd like to know, considering it's my car too.

[karl_760ti]

Another note, this was its first run an the motor is 225000ks old and fairly knackered. Dyno operator was abit worried about it an reckons cam timing is off aswell.

[Dauntless]

How much boost are you running mate? Manual or auto?

[striknine]

Not too bad then, only 25k more miles than mine, but my engine seems to be in overall pristine shape for its age (driven only by one old guy).

I'm quite interested in your z31 turbo modification, is there somewhere I can get info on this? Once I have my car running satisfactorially from a maintenance standpoint, moving to a water-cooled turbo is my first priority...

Edit: I'm a dumbass, as the z31 uses the same Garrett t3 that's already in my car. duh. Oh well, still learning :)

[Tilstar]

My car stock (89 740t) recorded 96kW at the wheels.
With 3 inch down pipe, rear muffler removed and air filter and 12 psi it went to 138 kW.

My engine's done a hard 240 000 (blows a little smoke and needs a rebuild)

Oh yeah, is auto (vs manual at rear wheels makes a difference)

[Tilstar]

LPG vs Petrol..... How much difference does that make??

I've got a mate with a dual fuel Ford 351, and it seems to have more balls top end on the petrol than on gas.

[karl_760ti]

My intank pump is ****ed so it dosnt run on petrol so i could only try gas... Motor has lot of blow by an there sounds like some piston slap. Looking at rebuilding it... Just wanted to get the lpg right so if i did rebuildit i could run it in hard without worrying about the tune.

[Bishop]

Hmm, not great, I'd be looking for something obvious like cam timing or ignition problems, that's low for an engine that is rated at like 182HP stock, I know a stock unit is supposed to put out like 112kw at the wheels, I found a dyno run on some site I lost track of...

My 760T had like 220000kms on it, and apart from being a little loud at times, made good power, I doubt it was much down from stock, hand timed runs showed it as good as road tests I found for it.

[karl_760ti]

How do i definatively check cam timing so I know FOR SURE it is correct?

[Bishop]

You need to pull the belt cover, find top dead centre, usually by pulling number one plug and feeling compression, then checking on the main pulley mark, and check the timing marks match up on the cam gear.

[PWRPUFF]

Am I the only one seeing that it's LPG, which because of its lower density, will output less power over petrol? :???:

If the timing is still at factory levels, then that may be a reason to poorer running. LPG can stand more advanced timing.

-- Kane

[karl_760ti]

It does drive like **** though. Absaultly nothing off boost. Has trouble just holding 80-100ks in top gear.

[MikeHardy]

Am I the only one seeing that it's LPG, which because of its lower density, will output less power over petrol? :???:

If the timing is still at factory levels, then that may be a reason to poorer running. LPG can stand more advanced timing.

-- Kane

not sure how you could do that, B230ET's don't have a adjustible timing.

LPG is very demanding on the igntion system too. though it does have higher octane so you should be able to run more boost to compenstate for the lower calorific value compared to normal petrol

[Dauntless]

So in other words, upgrade the ignition system and crank up the boost to about 12 psi? :-D

[volvorsport]

unless you can adjust the ecu internally , theres a setting for fuel quality for all markets , if its got an adjuster , i think you can advance it like 3 degrees maximum .

[flying242]

Am I the only one seeing that it's LPG, which because of its lower density, will output less power over petrol? :???:

If the timing is still at factory levels, then that may be a reason to poorer running. LPG can stand more advanced timing.

-- Kane
:werd: with LPG you can run more timing, more compression or more boost or a liitle bit more of all. It is hard without a programmable EMS to get things right.

Don't compare your dyno results with results from non-lpg engines, it will only lead to you pulling your hair out in frustration.

daz

[MikeHardy]

unless you can adjust the ecu internally , theres a setting for fuel quality for all markets , if its got an adjuster , i think you can advance it like 3 degrees maximum .

the fuel adjuster has 8 positions, 4 for fuel only, then 4 more with the same fuel settings but -1 to 2 degrees timing. it doesn't have any advance positions

[Angus242164]

I'd be looking into the LPG setup, every dual fuel car I've seen tends to run poorly on both gas and petrol, it's very hard to optimise the car to run on both well, it's usually a compromise. Dual fuel is almost always used purely for fuel economy reasons.

Straight gas is often a good way to go for performance engines, as you can set it up to run well on gas (advanced timing, higher compression etc) without worrying how it will behave when on petrol, because it will never be running on petrol.

I'd fix the pre pump and make sure the rest of the petrol system is working well (new fuel filter etc) and remove any restrictive gas system bits from the intake tract, and give it another run and see how much more power it puts out.

Where did you take it for the dyno run? I wouldn't mind putting my 760 on a dyno, it's stock, auto, has a 1.75" non turbo rear muffler and tail pipe, and has piston slap, but it seems pretty damn powerful to me.

[karl_760ti]

It was taken to Casey Automotive in cranbourne.

[Bishop]

Even taking into account losses with LPG on a stock setup, power should not be that low, I have owned and driven enough LPG only and Duel fuel setups to know you don't loose "that" much power with LPG.

The duel fuel Ute my father used to own ran damn near perfectly on both petrol and LPG, power loss would have been 5% max on LPG, and even then it's hard to say cause LPG feels stronger under certain types of engine load.

[MikeHardy]

are you using a singel or multi-point Lpg setup,

[karl_760ti]

WOOHOOOWoohoo

Fixed the piece of crap.
Cam timing was off. Now it aint an its running great. :D :rofl:
Now just needs new plugs and to find the gas leak(occasinally when driving i can smell gas).
Otherwise its heaps better than before, good for another 20kw easy i reckon. Boosts up HEAPS quicker. Will fix these issues then turn the boost up a few more psi :) :badboy:

[Bishop]

Good to hear, a B230ET is a nice weapon when running well.

[karl_760ti]

Yea, its going well. Can even get about 2psi if i stall it up on the line! :-D

Turned a corner last night an gunned it, filled a entire lane with tyre smoke for about 30metres :twisted:

Now its just some new leads and sort that bloody gas leak smell i get sometimes when i drive it.

[Angus242164]

You know Karl we might have to meet up and go for a bit of a cruise around Melb one night in our 760T's, I'm also pretty impressed with the performance of mine, even with a tiny exhaust, totally rooted dizzy cap, wrong ECU etc.

I can't wait to get all the maintenace out of the way (new filters, timing belt, fixing various minor issues) so I can start doing a few mods.

Last night I bought an Autometer "Sport Comp" 2 5/8" boost gauge with chrome mounting cup and bracket, so that will go in as soon as I get a vac line fitting for it. Let the ricing begin :-P (just kidding).

[karl_760ti]

You know Karl we might have to meet up and go for a bit of a cruise around Melb one night in our 760T's, I'm also pretty impressed with the performance of mine, even with a tiny exhaust, totally rooted dizzy cap, wrong ECU etc.

I can't wait to get all the maintenace out of the way (new filters, timing belt, fixing various minor issues) so I can start doing a few mods.

Last night I bought an Autometer "Sport Comp" 2 5/8" boost gauge with chrome mounting cup and bracket, so that will go in as soon as I get a vac line fitting for it. Let the ricing begin :-P (just kidding).

Yea man sounds sweet.
In a couple of weeks i should have mine pretty much tip top an going as good as it can. Gotta get new intank pump, new set of leads an work out were the f*ck the gas leak/smell is coming from an then it should be just about perfect.
Things are finally starting to go my way with the car after almost 3 months of tearing my hair out an draining my wallet, i can now sleep well at night :D