Tuning Fiat Punto 1.2 8V mk2 Performance Upgrade With Punto 75 mk1 Parts

[jonik]

Hi!

I made a video about Fiat Punto 1.2 8V performance upgrade with parts from Punto 1.2 8V 75 mk1. It's Finnish but has English subtitles

[ame]https://youtu.be/ST_zO6vgY-o[/ame]

Seems like the whole mk1 inlet side could be fitted to mk2. Map sensor is the main problem but I already fixed that in minutes

I'm not going to use mk1 throttle body because it has only 38mm butterfly. Instead I'm going to make an adapter for 46mm tb from Fiat Marea 1.6

I also ported the cylinder head, here's a video if someone is interested

[ame]https://youtu.be/ec38NQhbtiQ[/ame]

 

[nitramtpr]

That is an impressive bit of work. It'll be really interesting to see the gains made. Will you be keeping the supercharger or running normally aspirated?

 

[ddrexj]

Wow, that's really nice. I wonder how much power has increased!

 

[jonik]

That is an impressive bit of work. It'll be really interesting to see the gains made. Will you be keeping the supercharger or running normally aspirated?

Me too. Yes it will be supercharged

 

[jonik]

Wow, that's really nice. I wonder how much power has increased!

I'm hoping to see 20hp

 

[ddrexj]

I'm hoping to see 20hp

Wow, stock or supercharged?

 

[jonik]

Wow, stock or supercharged?

Supercharged, I had 120hp and 150nm in one point ?

 

[ddrexj]

Supercharged, I had 120hp and 150nm in one point ?

Damn, that's crazy dude!

Would you reckon it would have any impact if the car was stock?

 

[jonik]

Damn, that's crazy dude!

Would you reckon it would have any impact if the car was stock?

Yes it would definitely, 866 camshaft only helps a lot

 

[ddrexj]

Yes it would definitely, 866 camshaft only helps a lot

Might give it a try then ?.

 

[jonik]

Marea 46mm vs Punto 36mm throttle body:

There's 10mm size difference on butterfly valve and same 10mm difference on bolt pattern as well. Airfilter fitment is also 10mm larger, 70mm vs 60mm. Sensors are identical and Punto throttle cable holder can be used. But there's no place for ecu so I have to made one or mount it somewhere else

 

[JPVIPER]

Wow, cool project I will follow your work.

 

[jonik]

Bigger throttle body works very well. Ecu was the only problem because 46mm throttle body didn't have a place for it ?
[ame]https://youtu.be/qqUfJXXx1W4[/ame]

 

[nitramtpr]

Just checking back in with this thread, looking good now you've got it all together. Any feelings about the power upgrade with the new throttle body?
I like the scoop you've added too, are you gonna stripe it white to go with the side stripes?

 

[jonik]

It works fine. Not sure about power gains yet but I can easily tell that there's more power on high revs. Idle is a bit erratic now but faulty tensioner might be the cause. There can be problems with mixture with stock fuel injectors because there's 60% more flow area at full throttle. It's another thing how well the engine can breath though

The videos have been removed from here for some reason but here are the links again:
https://youtu.be/ST_zO6vgY-o

https://youtu.be/qqUfJXXx1W4

https://youtu.be/qpTs4aQ6z28

 

[AnteLo]

Idle should be fine with all that parts, 1.6 16v throttle is a bit too big for a 1.2 8v with only 866cam but luckly your's isn't stock!
Great post jonik, your posts and videos never disappoint

 

[jonik]

It was alternator belt tensioner which made the idle erratic, it's fine now

 

[jonik]

First acceleration test with Punto 75 intake manifold and 46mm throttle body. Not very impressed yet, maybe even slower than before. AFR is 14+ at full throttle and ignition is too retarded. Punto is now na for testing purposes, no boost

https://youtu.be/RZZ0nge3fko

I'm going to fix those faults and test again soon. Maybe one extra gear change is slowing it down too?

 

[jonik]

Another video, much better now. A bit more tweaking and car is ready for boost
https://youtu.be/aKaht7vuhb4

 

[jonik]

Here's final video where I changed performance exhaust manifold
https://youtu.be/0bWDKFqWxZs

I checked the dyno graphs later and found out that there's less power and torque under 3500rpm and more over it. So maybe not the best upgrade for city driving ?