Hello from Croatia!
My name is Ivica and I"m new on this forum.
First time writing an english,hope you understand me.
I own a 1999y punto60 .
Make a few modifications
-air box + air filter punto75
-throtlle body 42mm
-exhaust 4-2-1 punto75
-de-cat pipe
-fuel pressure 1,5 bar
-866 cam ( standard on punto 60 1999y)
I have a few question
How mach power I get ?
Whats hapened with AFR?(it is OK? or not)
Did sameone measured AFR on 1242ccm tb 40mm?

ivica said:

Hello from Croatia!
My name is Ivica and I"m new on this forum.
First time writing an english,hope you understand me.
I own a 1999y punto60 .
Make a few modifications
-air box + air filter punto75
-throtlle body 42mm
-exhaust 4-2-1 punto75
-de-cat pipe
-fuel pressure 1,5 bar
-866 cam ( standard on punto 60 1999y)
I have a few question
How mach power I get ?
Whats hapened with AFR?(it is OK? or not)
Did sameone measured AFR on 1242ccm tb 40mm?

Click to expand...

there was a thread about how much fuel goes through different throttle body diameters, but cant seem to find it

The only thing that worries me a little is your fuel pressure, 1.5bar seems a bit high to me. I would have not gone much over 1.0bar on a P60 engine

The AFR should be fine due to the way modern electronic injection works, if the car is running lean this is picked up by lambda sensor and the ecu will open the injector longer to compensate and vice versa. The ecu is not expecting the fuel pressure to be so high but it will still compensate - whether is can compensate enough with such high pressure compared to stock i couldn't say. Unless you fit a wideband lambda sensor and gauge you can only look at the spark plugs to see their condition
http://ngksparkplugs.com/tech_support/spark_plugs/faqs/faqread.asp

Thanks for answers!
I decreased fuel pressure to 1.2 bar.