AlloyTech V6

[Captiva Fan]

That's what inlet air temp, water temp, MAP sensors, and compensation tables are for.

Yeah, but if Mr Holden buys a water temp from Mr Marelli, fits it to 250000 Commodes, and then Mr Marelli's water sensor fails in a way that the ECU thinks it's working & blows up 1% of engines ... that's a fuckup of massive proportions with repurcussions that Holden rather than Marelli will feel.

[morerevsm3]

morerevsm3 - any (& I mean ANY) head can benefit from a little time with a die grinder & some r&d on the seat angles - believe it or not you rarely have to take out much metal to get substantial gains - economy of production means the seats/bowls/short turns are never ideal.

TK

I realise you can get signifigant gains with minor work, but friend bought a 190kw engine to put in modified production speedway car, but ports are so small, and castings so thin, it would be hard to make it match the current ecotec he has in it now

[muttaburra]

thats not a bad gain at all. alot of motoring jorno's canned this motor for being unrefined.


off topic. does anyone know if there is software for the new hilux. i would love to give mine a exhaust and tune and maybe the limiter lifted (5500 is stupidly low). there would have to be a few Kw's in the exhaust, its gotta be the worst i have ever seen.

[Nero]

I realise you can get signifigant gains with minor work, but friend bought a 190kw engine to put in modified production speedway car, but ports are so small, and castings so thin, it would be hard to make it match the current ecotec he has in it now

not knowing what the ecotech is doing it is hard to judge, but it may well respond to different approach?

[10sec rx7]

Bill hit the nail on the head, the inlet air temp corrections are stupid, 5deg change in air temp reduces timing up to 15deg!!!

we towed the boat with it on saturday afternoon and it really showed the difference, it used to struggle bad but now it just cruses away,

still dosent tow as good as the old boys Auto LS1 but a hell of a lot better,

[TK]

I realise you can get signifigant gains with minor work, but friend bought a 190kw engine to put in modified production speedway car, but ports are so small, and castings so thin, it would be hard to make it match the current ecotec he has in it now

It's not so much the size of the port, but the shape - methinks the alloytech heads would have a better port design than the ecotech, ie higher ports with a better angle into the bowls (though I can't say for sure, haven't seen one in bits yet).
You can get a lot of flow out of the old ecotech's, but I'd be surpised if they couldn't be matched by the new heads, & probably with better velocity too.

An extreme case to demonstrate the differences in port design - ever looked at a set of 4V clevo heads? - ports are humungous, but they really don't flow well for the size, the best way to make them flow is to fill up about 1/3 of the port with 2-pack epoxy & make them smaller with the centreline of the port higher up.

TK

[morerevsm3]

It's not so much the size of the port, but the shape - methinks the alloytech heads would have a better port design than the ecotech, ie higher ports with a better angle into the bowls (though I can't say for sure, haven't seen one in bits yet).
You can get a lot of flow out of the old ecotech's, but I'd be surpised if they couldn't be matched by the new heads, & probably with better velocity too.

An extreme case to demonstrate the differences in port design - ever looked at a set of 4V clevo heads? - ports are humungous, but they really don't flow well for the size, the best way to make them flow is to fill up about 1/3 of the port with 2-pack epoxy & make them smaller with the centreline of the port higher up.

TK

looking at the ports, I would guess the angle to be ~20*, they are not really any better angle than ecotecs

[gti6]

Hi 10sec_RX7, sorry this is a minor thread hijack... I've just had LPG fitted to the daily hack VP Berlina (V6) and I'd like to optimise the ignition curve - is this hard to due with a standard VP Computer?

[10sec rx7]

to do the stock VP setup you will need kalmaker, unfortunatly i dont have this yet!

[gti6]

damn! Thanks anyway Dale.

[Billzilla]

An extreme case to demonstrate the differences in port design - ever looked at a set of 4V clevo heads? - ports are humungous, but they really don't flow well for the size, the best way to make them flow is to fill up about 1/3 of the port with 2-pack epoxy & make them smaller with the centreline of the port higher up.

TK

'American' is secret code for 'my inlet ports are too big'.

I always get a laff out of the quote from Keith Duckworth when he visited the Ford factory in Detroit, and had a look at the big block V8's. He started laughing, and said, "You need and arrow right there", pointing to the bottom of the port.
"Why's that?"
"So the air will know which way to go."

:D

[F|sh]

the alloytech's can't be that bad if there making 300Hp for the Fholden open wheelers

[HoonBoy]

Don't they use ecotechs for the Formula Holdens and other catagories? I haven't seen a class for the Alloytech's yet.