Tuning gasflowed performance head for a 2.4 abarth??

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Tuning gasflowed performance head for a 2.4 abarth??

Dyno's mean nothing in my book. Its all about how the car actually drives. Unless you can trust the RR owner with your life and readings are taken within minutes there are too many variables of a rolling road to be in any way accurate. You can gain 10% from cold to hot engine ;) Why do you think induction kit fitters tell you to take the car for a good rag before RR it again.
 
i am talking about runs within 15 mins of each other. I have done a lot of work with bikes on dyno's and trust them as a tool to measure before and after mods if the runs are done on the same day and climatic conditions.
 
mmmm interesting stuff? i don't know alot about dyno's but i thought it was a case of measuring the resistance of the wheels turning the rollers and the machine just grades the reading accordingly? like a unit of measure? so if the cars running poorly, it reads a poor result, and visa versa. can't understand why it would read inaccuratly......so long as its at running temp that is but alot of these rolling road places have huge fans they stick infront of the car to push air though the rad to maintain that?
 
there was a company in the Midlands that was caught putting the brakes on during the before runs when they was selling a remaps. I cant name them as i wasn't there and forum rules prevent me, but i think they changed their name after anyway. (edit they still have a website in their old name, hmm they also have a website for their new name, maybe the old one is for the people that havent heard they are dodgy and the new one is to try and get back customers they lost after being caught being dodgy)


some rr have too many manual settings open to user error and rely on probes for air temperature, a rr with its own weather station built in is better as it a solid drum roller instead of a hollow drum roller.

as long as the operator knows how to use their machine you should get an accurate reading for gains, the actual figure isn't what to look, all you need to know is the difference between before and after with a fuel line reading too.

if you are testing your own mods no rr operator has any thing to gain by deliberately messing up the figures
 
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i guess the trick is to find a reputable one? i'm sure that would'nt take long with a bit of research........but getting back to the head, i really need to know wether the coupe 20v non turbo has the same head as the 2.4? i seem to have hit a dead end on finding out? some are sugesting that the turbo ones have different oil ways?

Gadge I'm pretty sure the bore is the same between the Stilo and Coupe, the Stilo has a longer bore (y) So I would assume the head would be fine off an NA Coupe, turbo may have different cooling and oil passages as you said.

Have you sourced which cams you are going to go for? Here's a set from Colombo & Biriani:

http://www.cb-cams.com/dettaglio_prodotto.php?lang=eng&id_prodotto=71

It's their most aggressive "Road Max" cam, they don't do a "Road Medium" for the 2.4.

I'm looking at getting a set of Max's for my 1.2 soon (y):D

I would get rid of both those cats if you're going for fast road cams, you'll be increasing the amount of exhaust gases passing through the exhaust so maybe it would be best for both to be done with? That's just me though, I don't like any restrictions in the exhaust and have gotten rid of mine :rolleyes:
 
Gadge I'm pretty sure the bore is the same between the Stilo and Coupe, the Stilo has a longer bore (y) So I would assume the head would be fine off an NA Coupe, turbo may have different cooling and oil passages as you said.

Have you sourced which cams you are going to go for? Here's a set from Colombo & Biriani:

http://www.cb-cams.com/dettaglio_prodotto.php?lang=eng&id_prodotto=71

It's their most aggressive "Road Max" cam, they don't do a "Road Medium" for the 2.4.

I'm looking at getting a set of Max's for my 1.2 soon (y):D

I would get rid of both those cats if you're going for fast road cams, you'll be increasing the amount of exhaust gases passing through the exhaust so maybe it would be best for both to be done with? That's just me though, I don't like any restrictions in the exhaust and have gotten rid of mine :rolleyes:

they look good bud, but i think "road max" may well be a little too much for what i want, from what i've learnt over the years, the more extreme the cam the more rough it runs at lower revs which will just make it lumpy in slow traffic and if i could i would drop both cats however i need at least one or it will fail the MOT on emissons..... what a bummer! :(

EDIT: that said though those cams are a good price??
 
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they look good bud, but i think "road max" may well be a little too much for what i want, from what i've learnt over the years, the more extreme the cam the more rough it runs at lower revs which will just make it lumpy in slow traffic and if i could i would drop both cats however i need at least one or it will fail the MOT on emissons..... what a bummer! :(

EDIT: that said though those cams are a good price??

Yeah that'll probably be the case if you fitted them, don't understand why "road mediums" aren't available for it though :confused: That's the drawback of moving the power higher up the rev range :rolleyes: You could enquire about getting your oem cams re-profiled by a reputed machining shop? That way you're in control of the outcome, if you can re-profile them that is, and is probably cheaper as well (y)

But if you're going to gas flow your head then a pretty aggressve cam will work pretty well with it and will give you the best returns?

Perhaps you could get flanges welded to one of the cats and weld flanges in where it came out so as you could run with them both out but come MOT time bolt one of them back in? If it was me I would want a completely free flowing exhaust so there is no restriction for the exhaust gases (apart from a backbox :)).
 
I can put you in contact with somebody who can get 200 cell sports cats at a good price. There are issues with the Lambda sensor though as one of them plugs into the first one. You can just take the second cat out and go straight through with no issues.
 
I can put you in contact with somebody who can get 200 cell sports cats at a good price. There are issues with the Lambda sensor though as one of them plugs into the first one. You can just take the second cat out and go straight through with no issues.

yeah that was what i was thinking stu, just drop the second one out, in a perfect world i wish i could do away with them both? but it would flow alot better by getting rid of the second one and improving the rest of it going to the back, i must admit mark i never gave it a thought as to reprofiling my old ones? i don't know if anyones had any good experiences with this method? :)
 
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