Hello everyone i'm Danny from Greece and i have a 2002 Seicento Sporting Mpi.

This week my 1.1 Sei is going to be a little rocket.

I have just bought a Complete Punto 75 Mpi Engine in good condition.

Let's start from the begining :

-Total Engine Rebuild
-Sporting Gearbox
-Cylinder head work - tuning
-Stock Flywheel Lightened and Balanced
-A new Clutch Kit(What would you suggest?)
-Punto 75(866 cam) Reprofiled(I will give you more info on Monday-Tuesday about duration etc) - Very "Angry" Characteristics Stage 2-2,5
-Adjustable Camshaft Vernier Pulley(I saw one from Piper Cams i might stick with this or anything else?)
-Custom Headers
-Custom Exhaust System (50.5 Diameter of pipe from headers to backbox) all Stainless Steel,with FOX middle box and Remus Group N Backbox.NO catalytic Converter.
-Iridium Sparks and Spark Cables (Any suggestions?)
-Remap on stock 1.1 Mpi Ecu 6F OR Any other suggestion
-Air Induction Kit ? Has anyone tried this one on P75 Engine? (http://www.dexcraft.com/high-perfor...uecento-seicento-sport-air-induction-kit.html)


The only problem now is with the inlet manifold.Can we use the Punto 75 inlet manifold and throttlebody or we have to replace it with the plastic inlet manifold and smaller throttlebody from the 1.1 Mpi Engine?

I will upload photos in one or two days.

If you have any other suggestions please let me know soon!!!

The P75 manifold can be used. But you need to relocate the servo take off.

I'd use the (bigger) flywheel and clutch out of the 1.2 16v or the 1.4 16v. Both have bigger contact area but are not appreciably heavier.

You'll gain no performance from Iridiums.

2mm is probably too big for the exhaust.

Check that that ECU can be remapped. Megasquirt/microsquirt would free up a lot of areas (throttle body choices, etc.).

Personally (since I have done this conversion and now own the car) would look into Stand-alone ECU, the stock ECU is rubbish and I am unsure weather it can be mapped easily, but for the cost of EMU (stand-alone ECU from Poland that I have heard great things about) and judging by how much money your throwing at it I really cant recommend it more.

Becareful if you try to use the 1.1 plastic inlet on the 75 head, it can be a pain to get to seal right as in some places the rubber that seals the plastic one sits very close to the edge of the face on the head. I ended up having to use the 1.1 head with the 866 cam which doesn't see as much of a gain.

My personal opinion would be to use the 75 inlet and mod things to fit and then go for a Standalone ECU and you wont look back.

DO IT RIGHT THE FIRST TIME!!! trust me on this one.

I am equally doubtful that you will find somebody that can make a proper remap of the MPI ECU (as a hint - one needs to also reconfigure a truck load of knock sensor calibration parameters that are different for the 1.2 engine - do not expect anybody to know how). Unless of course there are some magicians in Greece that we do not know about (there are some here :devil Also to consider is the need to have the cam position sensor, which the P75 engine is not ready for plug'n'play and that you will defo need.

Also, as Fingers said, 2inch exhaust for 1.2 8V n/a is a serious overkill (and also counter productive I think). Perhaps if you are planning to turbo it later...

The Cam sensor as Woj says is a small issue and it can be got around.

For an example I am planning a turbo on my 75 engine and I am considering a 2inch exhaust.

I had a 2.25inch exhaust on this engine when it was in my Cinq and although it was a massive improvement over the stock system I felt it wasn't right and was going to change to a 2inch system if I had kept it.

On a turbo you'll only feel a difference in exhaust size when off boost. But go to big on an n/a and you stand to loose bottom end.

Guy Croft told me that 2" is too big for a 1.4 16v, and he knows his onions.

I'm running 2" on my Punto with the 1.2 16V... That said, I'm also running the stock backbox, so not much of a difference is seen there.

I'm curious as to what the differences are between the 55 head and the 75 head, seeing as I just bought a Sei yesterday and have the old 1.2 engine from my Punto laying around... Do the ports have a different size or so?

Not sure!

In the UK the 55 was an SPI car. The 1108 Punto was dropped with the Mk2.

P75 is an early MPI car -- batch injection, no knock sensor or cam sensor, lumpier cam (alllegedly) bigger valves than the P60, better exhaust manifold.

But there are few around now in worthwhile condition.

You guys must surely have had the MPI head on the Seicento's 55. That's the same I have for mine (Seis with the IAW 4AF or 59F?).

I think there's no difference at all between an MK2 60 head and an MK1 75 head internally, but I'm curious if there's any change in porting between the 55 (or other 1.1 heads, be it MPI or not) and the 1.2 heads. As far as I knew up until now, they were all the same even valve-wise, and pretty much interchangeable with exception of the PMK2 head which has threads for the engine mount.

Since I have a complete PMK2 engine just standing there, on which the mount bolts broke off, it could be used as a whole on the Seicento I think. But if not, then I can just swap heads and be done with it, granted that I'll have to get a P866 cam either way.

Oh, also regarding the cam sensor, the car will run just fine without it, and without any noticeable change in mileage or power. I got rid of it on the Punto when I swapped the 16V in. The knock sensor is a problem though.

fingers99 said:

The P75 manifold can be used. But you need to relocate the servo take off.

I'd use the (bigger) flywheel and clutch out of the 1.2 16v or the 1.4 16v. Both have bigger contact area but are not appreciably heavier.

You'll gain no performance from Iridiums.

2mm is probably too big for the exhaust.

Check that that ECU can be remapped. Megasquirt/microsquirt would free up a lot of areas (throttle body choices, etc.).

Click to expand...

So,is it really worth (in terms of performance) to use the bigger flywheel and clutch?,i can find both of them for 150 Euros in very good condition.

As for the exhaust i was planing to make a turbo conversion on the 1.1 Mpi Engine,which i never did..so i sold the whole turbo kit and i am now using the 2mm exhaust system in my stock 1.1 Mpi ...The Performance difference comparing to the stock exhaust system is sooooo huge,specialy in the first 2 gears,so i'm keeping this also to that new engine.

Some say the Iridium Sparks do some kind of change,some say no.I Think they are going to show their difference over stock spark plugs with a Stand-alone Ecu and a right map on it.

mariocinq said:

Personally (since I have done this conversion and now own the car) would look into Stand-alone ECU, the stock ECU is rubbish and I am unsure weather it can be mapped easily, but for the cost of EMU (stand-alone ECU from Poland that I have heard great things about) and judging by how much money your throwing at it I really cant recommend it more.

Becareful if you try to use the 1.1 plastic inlet on the 75 head, it can be a pain to get to seal right as in some places the rubber that seals the plastic one sits very close to the edge of the face on the head. I ended up having to use the 1.1 head with the 866 cam which doesn't see as much of a gain.

My personal opinion would be to use the 75 inlet and mod things to fit and then go for a Standalone ECU and you wont look back.

DO IT RIGHT THE FIRST TIME!!! trust me on this one.

Click to expand...

Thank you for your advice,trust me i don't want to use the plastic 1.1 inlet manifold and small throttlebody.Instead of that,i was planning to make the P75 throttlebody even bigger.The mechanic says that it is not that difficult to remap the MK2 Ecu,but i know very well that this is probably going to fail and of course it is nowhere near what a stand-alone Ecu could bring in terms of performance.I have 2 reasons why i am going 8V and not 16V.First one is that the car is legal as there is no optical difference with the 1.1 engine and it going to pass the Roadworthiness Test Centre and the Second reason is that i'm keeping the A/C on my car and this is a MUST when you live at Greece with 42 celcious at Summer,so the plan is to make a 1.2 8V Rocket...nothing in the middle...nothing more or less....it has to be done RIGHT.The stand-alone Ecu from Poland you're talking about is this one? http://www.topendpower.pl/p/en/ecu-m-emu/emu+-+engine+management+unit+-+stand+alone.html

We have great Ecu Programmers in Greece,but they usually work on really expensive ecu's which are also used in very powerful and expensive cars like Mitsubishi Evo etc...and i don't know if they can work with that Ecu...i really have no idea...i will have to ask them tomorrow.As far as i've seen the cheapest Stand-alone Ecu they work with is the "DTA S40 Pro".

Sorry for my bad english.

thunderfox5 said:

You guys must surely have had the MPI head on the Seicento's 55. That's the same I have for mine (Seis with the IAW 4AF or 59F?).

I think there's no difference at all between an MK2 60 head and an MK1 75 head internally, but I'm curious if there's any change in porting between the 55 (or other 1.1 heads, be it MPI or not) and the 1.2 heads. As far as I knew up until now, they were all the same even valve-wise, and pretty much interchangeable with exception of the PMK2 head which has threads for the engine mount.

Since I have a complete PMK2 engine just standing there, on which the mount bolts broke off, it could be used as a whole on the Seicento I think. But if not, then I can just swap heads and be done with it, granted that I'll have to get a P866 cam either way.

Click to expand...

Only change MPI and SPI is that the SPI has smaller entries to the inlet ports (due to the stud placement. Otherwise, 1108 and 1242 are the same casting. The 1.4 8v has a further enlarged entry to the posts.

Seicentakias said:

So,is it really worth (in terms of performance) to use the bigger flywheel and clutch?,i can find both of them for 150 Euros in very good condition.

As for the exhaust i was planing to make a turbo conversion on the 1.1 Mpi Engine,which i never did..so i sold the whole turbo kit and i am now using the 2mm exhaust system in my stock 1.1 Mpi ...The Performance difference comparing to the stock exhaust system is sooooo huge,specialy in the first 2 gears,so i'm keeping this also to that new engine.

Some say the Iridium Sparks do some kind of change,some say no.I Think they are going to show their difference over stock spark plugs with a Stand-alone Ecu and a right map on it.

Click to expand...

Iridium gives longer life and better emissions as a rule, nothing more.

Of course, using a bigger clutch and flywheel isn't going to improve performance, but it may cope better with any torque increase.

fingers99 said:

Iridium gives longer life and better emissions as a rule, nothing more.

Of course, using a bigger clutch and flywheel isn't going to improve performance, but it may cope better with any torque increase.

Click to expand...

I don't think this is worth...maybe changing it later.

The Mpi heads have a different shape inlet to allow for the injectors spray path.
I used a lightened 190mm flywheel on my 1242, but fitted a 180mm clutch.