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Technical Sei 1368 8v turbo

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Technical Sei 1368 8v turbo

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soozukisteve

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Well, having been exploring ways of getting my 1.4 fire engine running properly with no success I have finally decided to go TURBO!!!!!

The old thread ( https://www.fiatforum.com/cinquecento-seicento/221666-1-4-8-valve-project-seicento.html )

I have collected most of the bits and pieces I will be using and intend to run low boost (maybe 4-6 psi) day to day, increasing to maybe 12-14 psi for high boost.

I will try to keep the updates coming as frequently as possible but im really busy with work so please bear with me...:D:D:D

Here are a few random pics to look at for the time being
 

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looking good mate i will be following this closly and would love to see how it will stack up against my 1372 8v turbo (punto gt) cinq hmmmm we shall see but i bet yours will be the easier job lol
 
mariocinq said:
i bet yours will be the easier job lol
Click to expand...

Without a doubt it will be!!:D(i can speak from experience as I got half way through a cinq/uno turbo conversion a few years ago)

The normally aspirated 1368 is already in and has covered a few thousand miles without major issues (apart from the feeling of it holding back and the ecu keep throwing a code)!!!

This is intended to be an interim engine for the time being as I plan to build a bulletproof fire to stand a silly amount of boost next year.

I think yours will have me on outright power though as I will be really happy to see 100-120 bhp on high boost!
It all depends what happens on the mapping session as this is my only car so it needs to be relatively reliable!!
I will post up all the specs and components when I get the chance.
 
what you want is a car that can give the power you want at the lowest possible boost.

running silly boost is good for pub talk but that is it

higher boost requires lower compression... low compression + bad off boost performance.

higher boost means more heat so requires bigger intercoolers... bigger intercoolers + huge lag

All this is why i moved away from 16v pistons. they are to low of compression.

I machined the head to give me exactly 8.5:1 (iirc)

engine was much better with this compression. idled better, gained boost quicker. ran smoother all-round,

and it should improve reliability a lot.
 
I completely agree and I grew out of bragging in the pub a few years ago!:)


A quick rundown so far

Modified engine/gearbox mounts-silicone filled after my experiments with keeping knackered mounts together.Engine mount modified with grinder to allow clearance for alt belt and spaced out by 4mm and down by 6mm to stop the alt pulley grinding any more off the inner wing!!:D
8mm longer alt belt for (more!) clearance.
6x15 punto alloys with 195/45 yokos.
Abarth long studs and 10mm spacers all round (lips removed from spacers to fit the alloys.
Rear arch lips reduced by approx 8mm for clearance.
Lowered 30mm with uprated dampers and springs.
Slightly ott 4in powerflow rear exhaust.
Front braided hoses(rears to come soon)
Rear disc conversion
Big vented discs up front.
Cinq front strut brace (more clearance than the seic version)
OMP 6 point roll cage.
Metal from front panel (behind the little headlight grills) removed for extra cooling.
Oil cooler and filter relocating kit.
Garrett T2 water cooled turbo.
Homemade manifold to turbo flange.
Various bits and pieces relocated to make extra room in the engine bay....
R5 GT turbo pace intercooler.
Modified P75 inlet manifold (decided not to use my throttle bodies!)
2.5 bar map sensor
82 deg thermostat mod.
Microsquirt ecu
Bonnet struts

I know I have forgotten loads...

I am planning to run a compression ratio of 8.5-9.0 using a spacer plate between two metal headgaskets. I need to do the maths to work out the spacer thickness before I arrange to get it laser cut.
Lots more stuff to do and a few more bits to collect but will keep posting as I go..
 
sounds like a really good build

i did consider going down the normal route of turboing and N/A fire engine but i would never reall trust it where as with the pgt lump once rebuilt and i run it in properly i will have something with the power i want in stock form that will be fairly reliable if looked after right with the option for insane power should i completely lose the will to live lol

(i may go for 200+ lol)
 
nice looking car mate, and I love those alloys on it, really look good.
I'll be watching this closely, I'm looking at this myself, I've got the T15 turbo and an intercooler just need everything else now. when you do the build, please use small words for us that arn't great with the oily bits, this could be a good one for the guides if written up right.(y)
 
carefull with the thermostat mod. i did it as in the guides to. also tried lots of combinations of parts.

at idle and in traffic the temps would sit at the perfect temps. but once moving it would drop VERY low.
on the motorway it would drop so low that megasquirt turned warmup enrichment on which caused it to cool even more.

that was the worse i had it but the best i could get was with the thermostat going up and down between 85-70ish which is a lot and imho would be putting way to much thermal fatigue on the engine (cant see it taking long to kill the head gasket or crack the head.)

proper thermostat shifts about 3c so much better.
its only a couple of c higher then the modded one but with a oil cooler it wont be anything to worry about.
 
craigb244 said:
carefull with the thermostat mod. i did it as in the guides to. also tried lots of combinations of parts.

at idle and in traffic the temps would sit at the perfect temps. but once moving it would drop VERY low.
on the motorway it would drop so low that megasquirt turned warmup enrichment on which caused it to cool even more.

that was the worse i had it but the best i could get was with the thermostat going up and down between 85-70ish which is a lot and imho would be putting way to much thermal fatigue on the engine (cant see it taking long to kill the head gasket or crack the head.)

proper thermostat shifts about 3c so much better.
its only a couple of c higher then the modded one but with a oil cooler it wont be anything to worry about.
Click to expand...

Thanks for the advice.I will start out with a standard stat and keep my eye on temps!!

Couple of other things.
Could I get away with not using an external swirl pot (i dont know how effective the standard in-tank one is)?I figure its probably not worth the risk?

My maths is a bit hazy but I have worked out I will need a spacer plate of approx 2.1-2.2mm(need to get headgasket compressed depths to be totally sure)
This will give me a cr of 8.9:1
I am going on 72.0 bore,84.0 stroke and 11:1 compression ratio
If anyone feels like double checking my calcs please feel free!!:D:D:D

No further work done today as I've had very severe man flu.....
 
Benjammo said:
nice looking car mate, and I love those alloys on it, really look good.
I'll be watching this closely, I'm looking at this myself, I've got the T15 turbo and an intercooler just need everything else now. when you do the build, please use small words for us that arn't great with the oily bits, this could be a good one for the guides if written up right.(y)
Click to expand...


Thanks.
I think the alloys really suite the sei.Not sure what model punto they were off but wanted something that looked abarthy(if that makes any sense!!).

I promise I will keep to laymans terms for the future.I get carried away sometimes....(y)
 
soozukisteve said:
My maths is a bit hazy but I have worked out I will need a spacer plate of approx 2.1-2.2mm(need to get headgasket compressed depths to be totally sure)
This will give me a cr of 8.9:1
I am going on 72.0 bore,84.0 stroke and 11:1 compression ratio
If anyone feels like double checking my calcs please feel free!!:D:D:D
Click to expand...

try this bit of software. for c/r

wouldnt worry about the swirl pot, internal one seems to be up to the job
 

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Not a very constructive day really.Still feel like crap!:(

Managed to paint a little more of the roll cage and noticed that some friggin urchin has managed to scratch the front part that I had already painted:bang::bang:

Tried to plumb in the oil cooler kit and I dont think I have ever sworn so much.Its not the best quality kit and is massive as well as the cooler itself being quite large.
I have decided not to use it now which frees up loads of space at the front so I may go for a larger radiator and a water cooled oil sandwich plate instead.
 
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