Fiat Coupe 2.0 16v NA upgrade set up

Hello,

I have a Fiat Coupe 2.0 16v NA with 31000km

I would like to upgrate the engine. Actually, I have a chip FC performance, an intermedaire Raggazon and a silencer inox. I have kept the cat.

My project is to invest 2000€. My idea is to put the cat cam 1900421 (650€), regrind the head (200€), and make a reprogr (600€) the rest for gaskets, differents parts and for my friend. During this time I will get the time to paint and clean the differents upper parts.

My voluntee is to get litlle bit more torq because I live in the region of the rally Monte Carlo.

On the side, I will install an oil radiator, new sparkplug cables, etc...

Do you think this configuration is a good idea? What will be the comportement result with this new cams? And what will be the best way to porte my head?

Or do you think it will be a best idea to invest the 2000€ in a short gearbox?

Thanks for your help

I'm no expert but for NA cars tuning/mods usually give low bhp/torque improvement for ££££'s spent...unlike a turbocharged car, unless you spend a lot maybe fitting ITBs or a Supercharger etc. I have an NA car with ported/polished head. race cams, lightened flywheel and a remap, race air filter and a Miltek exhaust about £5K of modifications for 40bhp increase!? To be honest it has totally transformed the car and its drivability, the best mod was probably the lightened flywheel making the engine feeling much more responsive and revvy. If it was tuning a Coupe I would personally buy a 20vt rather than mod a 16V NA, failing that I would buy an exhaust as the NA sound is fantastic and that would make you feel faster everywhere!

I am guessing the cams will move the torque further up the rev range. Gearing has a massive impact sacrificing the top end (rarely used in any case).

check my project: https://www.fiatcoupeclub.org/forum...e-95-broom-yellow-2-0-16v-na#Post1596002

what I´ve found over the years dealing with two modded 16v NA engines (one in coupe, second in tipo, slightly different setups)

this are the basic mod:

1) exhaust - nice... 55-60mm pipe, 2 straightrough silencers, sport- 100cpsi cat of biggest size u can fit or decat if u want

2) airbox modification (buttom from tubo+6 holes) + stock, paper filter

-only these 2 mods allowed me to to fly trough 1/4 mile in 15,8s constantly... not bad..we are in teritory of stock 16VT

further , still bolt on and budget steps:

3) throttle body -remove the step in upper part of TB, which causes small restriction during WOT

4) remove balance shaft belt - engine wil rev more freely

5) fc performance chip

with this u should be at the same level like stok 16VT if your engine was well maintained (has good compression, oil pressure etc)

engine(rocker) cover down job:

Cams : from my point of view, the Cat cams set u choose will not give u much noticable difference over the stock set, or Tipo 107kW intake cam + 102kW /stock exhaust ..only few kW/Nm up with good driveability and maybe powerband little bit higher (like 16V 107kW tipo - 4500-5000rpm max torque -6300-6500 max power)

I would go for complete head (+intake manifold)work +Tipo 107kW intake cam which u can purchase chepaer thas set of cat cams:)

This with propper mapping will give u best results...

and as was mentioned - lightened flywheel will transform the car

Gearbox - no need to change gearing...

The FC chip was developed on my car, as it happens, so I'm glad it's seeing good use.

I'd certainly look at a lightened flywheel, but I'd also consider locking the balance shaft and removing the belt (which means you can also fit a wider cambelt for peace of mind). Both of those mods reduce the rotational inertia of the engine which will get you moving faster in low gears (and equally, lighter wheels).

The points made above about pounds per kW are correct; it's a lot easier to shove extra fuel through a turbo lump than an NA (where you're basically restricted to increasing revs, changing combustion chamber geometry, and changing the cam timing/lift). Beware if you're changing the exhaust - the four into two into one and the position of the catalyst all affect cylinder exhaust scavenging at different RPM. Equally, if you delete the airbox, you'll lose a resonant cavity that hangs off the front of it and significantly improves low speed torque.

Neil