best upgrade for alfetta gtv

Darryl · March 28, 2015, 05:13:34 PM

Mr Rossi means just cable tie the (flat) filter onto the top of the alloy lower half, no top cover (so no restriction in inlet). Or at least that's what I think he means... Or you could fabricate a more free flowing cold air intake by hacking up that cover + some large diameter hose (untested, but I did check flow on something similar that I really need to get my act together on and test in practice).

carlo rossi · March 30, 2015, 05:09:38 PM

yes ill send a photo its great for low end speed but the top cover makes a big diff at speed ie over 100 kph
but these covers are hard to by, because they are plastic they didnt last well
so for damo racing maybe just a cable tie could do be better outcome , but if you have the cover use it and you can get a second air ram of the hot air inlet
ps the canberra show was great ,racing ferrari's down the highway ( I was not racing ) they were racing each other
sits very happy at speed wont post the actual speed

Alfapride · March 30, 2015, 05:53:21 PM

I have the plastic bit original wondering if I should remove it or keep stock I blocked the second air pipe that goes to the exhaust side as its hot air on that side thought would be best to keep only cool air coming in

carlo rossi · April 01, 2015, 03:48:56 PM

yes thats the one and it works better with the lid on over 80 kmph doesnt sound as good thou
what jets are you running? if you have stock cams using 145 main with /8 emulsion and 57 idles works best in essence almost euro spec , 33 mm chokes and stock cams 145/148 main /8 emulsion 59/60 idles (2.5 turns out)
I will get some dyno figures on wednesday.to qualify it

carlo rossi · April 03, 2015, 09:07:42 AM

Damo next time you track the car try the 145 main i think its a little sharper than 148 considering also that you have the race 7 emulsion tube
love to see outcome, good luck

DHDamo · April 03, 2015, 09:35:03 AM

Yeah, you think it'll be an improvement? It's easy to change so I might have a play.

Duk · April 05, 2015, 03:56:08 PM

Given the success of such small changes, it would be interesting to see the results of having some nice and accurate 3D ignition timing control.
When I had my Giulietta, I noticed how much nicer it's idle characteristics were when I advanced the ignition timing. Now I was smart enough to know that simply winding 10+ degrees of additional advance into the engine running from a mechanical advance distributor wouldn't work. But when you see any programmable computer or factory computer's ignition map, you realise just how much low load ignition advance an engine can accept.
Being able to accurately give the engine the ignition advance it wants at any given rev and load point is a huge plus.

carlo rossi · April 10, 2015, 06:10:24 PM

ok on the dyno lost 7hp with the 145 main
go back to 148 and the 60 idles feel better and im trialing 42 accelerator pumps
ill have dyno results on thursday
I have booked a weekly session til its right
cheers ps dont forget to lub the weights in the dissi wd 40 lightly there is a window on the side

DHDamo · April 10, 2015, 06:18:41 PM

In mine I think the 145 is a bit more responsive (on the road). Gonna take both to the track next and swap after a few sessions - will see what happens to lap times when it's under the pump. I guess mine could be different with different emulsion tubes and corrector s etc. Keep us updated on the dyno results.

carlo rossi · April 15, 2015, 09:39:44 PM

on dyno lost a little but it was sharper try 60 idles with 145 main

carlo rossi · April 25, 2015, 05:48:41 PM

ok this is the best outcome on mine
60 idles 150 mains series 8 emulsion tubes 210 air correction
the difference in mine between 145 mains and 150 is around over 9 hp
and of course 33mm chokes

DHDamo · April 25, 2015, 06:46:46 PM

Wow, that's a big difference. I've got some leaky gaskets to fix and will put these extensions between mount and carb and see how that goes with the 150 mains.

carlo rossi · April 26, 2015, 05:25:14 PM

yeh its like a small power band after 1/3 pedal you can really feel it
interesting thou without the airfilter lid on the `150 main felt a little too fat
so by putting the lid on generally with the supposed restriction in air flow you lean up a bit because the full filter
makes it richer ( in Normal cars) not so with the alfa
they must have really done there homework on flow because it does go better with the full filter on
bearing in mind thats the late model airbox not the older cylinder style
that new box is quite a clever in its airflow dynamics
ps I slighlty modified it
I have spare if you want, only the base thou , not the plastic top