Technical Tuning a 75 engine

[Dave Henry]

Hi All

I have a punto 75 engine in my Lancia Y10. Great engine that I want to make better.

It is currently running with a K&N 57i induction kit that has been adapted so that more cold air can get to the filter and also to get the bonnet closed (see below)

It now also has a custom stainless steet exhaust that got fitted last week. Bonus of no cat as the car is a 1987.

I have a turbo, oil cooler and intercooler that I planned to use to turbo this engine. However, I have decided to put this on hold and enjoy the car for a bit.

So what I need for you guys are some suggestions on how to make this engine better. It would be good if I can get 100bhp out of it but not sure if that is easily achievable. I am running the standard ECU, can it be remaped? Any advantage in larger injectors?

Any advice would be appreciated.

Cheers

Dave

 

[MFrV1]

Love the Lancia!
Sorry I can't help, but I'll pay attention to the replies, to help with my 75.

 

[tinytim]

Hi,
If this is the 8v engine then you could fit the 16v head. You will need to inform your insurance company of the mods otherwise you are effectively uninsured.....

 

[Dave Henry]

Hi,
If this is the 8v engine then you could fit the 16v head. You will need to inform your insurance company of the mods otherwise you are effectively uninsured.....

Cheers

When I chose the engine to go in the Y10 I considered both the 8v and 16v. I opted for the mpi 8v as there was a view that you could get more power and torque out of it than the 16v unit.

I am no expert on how to get the best out of these engines so would changing the head to a 16v unit to get say 10bhp more be money well spent? Or would a 'hotter' cam and some work to the head for the 8v unit have a better result?

Thanks

Dave

 

[DaveMcT]

I dont know much about Fiat tuning, but the 8V should be capable of at least 100bhp.
A very useful book for any sort of engine tuning is Tuning the A Series (or some such) by David Vizard. Apart from electronics, if its not in here its not really worth knowing.
Tuning the A-Series Engine: The Definitive Manual on Tuning for Performance or Economy: Amazon.co.uk: David Vizard: Books

He was getting 120bhp from 1275cc BL (Rover) Minis back in the 1970s and he did that with a single 1.5" (38mm) SU carburettor gas flowed to deliver the same as a 1.75" (45mm). So I'd guess a similar size throttle body and MPI injection would be a good start.

The head will probably need some gas flowing work, but no doubt much less than an old BL 5 port A-Series. Then, a hotter cam and a compression increase and a decent flowing exhaust manifold will work wonders.

Think about using forged pistons and balanced/polished conrods. More power = more internal stress.