Overboring and choosing a turbo
6 posts • Page 1 of 1
Overboring and choosing a turbo
Because of stupid finnish laws I have to limit my mods. If I modify the exterior and interior I will have enough points to change either the engine or the gearbox.
And because the maximum power allowed for a mk3 Fiesta is 159,6bhp I have chosen to change the gearbox and leave the 1.4 litre CVH in and tune it.
I'm going the turbo route but there aren't many suitable pistons. So I was thinking about overboring. The standard bore is a bit over 77mm. Is it possible the overbore the block to 80,5mm? Or is that too much?
I will get DTA management and custom manifolds. But which turbo should I get? T25?
And because the maximum power allowed for a mk3 Fiesta is 159,6bhp I have chosen to change the gearbox and leave the 1.4 litre CVH in and tune it.
I'm going the turbo route but there aren't many suitable pistons. So I was thinking about overboring. The standard bore is a bit over 77mm. Is it possible the overbore the block to 80,5mm? Or is that too much?
I will get DTA management and custom manifolds. But which turbo should I get? T25?
- Fez
- Senior Poster
- Posts: 380
- Joined: Fri Jul 12, 2002 7:48 pm
Can you not get a RS Turbo engine ? it would work out cheaper.
Greg : Owner of a FRST for 14yrs
2009 FRS2 : 377bhp ATW / 395lb/ft
1990 FRST : Sold.
2009 FRS2 : 377bhp ATW / 395lb/ft
1990 FRST : Sold.
- Fezzy Turbo
- Tartan Turbo Terror
- Posts: 4681
- Joined: Wed Aug 02, 2000 1:00 am
- Location: Aberdeenshire
- Your car: mk2 Focus RS
Car: 2009 Ford Focus RS
Sure you can change as many parts as you like as long as the MoT inspector or cops dont find out.
Here's the exchange percentage system for a 3-door Fiesta:
Bodyshell 16,0 %
Floorpanel 8,0 %
Bonnet 2,0 %
Front wings (1,0 % each) 2,0 %
Front dors (2,5 % each) 5,0 %
Tailgate 2,0 %
Heater 2,2 %
Dashboard 1,2 %
Meters (speedo etc) 1,2 %
Front seats (1,2 % each) 2,4 %
Rear seat 2,0 %
Interior panels 2,0 %
Windows and wipers 2,0 %
Bumpers (1,2 % each) 2,4 %
Grille 1,0 %
Lighting and wiring 1,6 %
Front axle and suspension setup (brakes, wheels, etc.)14,0 %
Rear axle and suspension setup (brakes, wheels, etc. 6,0 %
Steering setup 3,0 %
Engine 12,0 %
Starter 1,5 %
Alternator 1,5 %
Transmission and clutch 9,0 %
Total 100,0 %
Every part you change or remove will have to be added to the exchange percentage.
The best thing to do is to keep changed parts below 35%.
If you exceed that you have to go to a special MoT check up: every part will be marked with a code (costs about 200e).
If you change 50% or more you need to register the car as a new vehicle.
That means that the car needs to pass the newest emission tests. The problem is you have to go to a special test center.
The tests cost about 10 000e per test. And you also have to either pass the newest crash tests or make lots of stress handling calculations.
And you also have to pay new car tax. About 6 000e. Not to mention the special permits you need (200e each).
So in other words it's almost impossible for "normal" people. Only one car has been made: http://sivut.koti.soon.fi/iirol/kotisivu/RA2_Eng.html
It was designed and built by a group of Finnish students of automotive engineering and industrial design.
And if you tune or change the engine you have to have brakes and anti-rollbars etc. from the highest spec model.
And there are a couple of other laws as well:
You can have 20% more power than the most powerful engine (133bhp+20%=only 159,6%)
The displacement can be 25% more than the biggest engine. (1800+25%=2250, not a problem then)
The new engine can be 25% heavier than the heaviest engine. (not a problem)
These are the laws that cause the most problems. But there are lots of other irritating laws.
Here's the exchange percentage system for a 3-door Fiesta:
Bodyshell 16,0 %
Floorpanel 8,0 %
Bonnet 2,0 %
Front wings (1,0 % each) 2,0 %
Front dors (2,5 % each) 5,0 %
Tailgate 2,0 %
Heater 2,2 %
Dashboard 1,2 %
Meters (speedo etc) 1,2 %
Front seats (1,2 % each) 2,4 %
Rear seat 2,0 %
Interior panels 2,0 %
Windows and wipers 2,0 %
Bumpers (1,2 % each) 2,4 %
Grille 1,0 %
Lighting and wiring 1,6 %
Front axle and suspension setup (brakes, wheels, etc.)14,0 %
Rear axle and suspension setup (brakes, wheels, etc. 6,0 %
Steering setup 3,0 %
Engine 12,0 %
Starter 1,5 %
Alternator 1,5 %
Transmission and clutch 9,0 %
Total 100,0 %
Every part you change or remove will have to be added to the exchange percentage.
The best thing to do is to keep changed parts below 35%.
If you exceed that you have to go to a special MoT check up: every part will be marked with a code (costs about 200e).
If you change 50% or more you need to register the car as a new vehicle.
That means that the car needs to pass the newest emission tests. The problem is you have to go to a special test center.
The tests cost about 10 000e per test. And you also have to either pass the newest crash tests or make lots of stress handling calculations.
And you also have to pay new car tax. About 6 000e. Not to mention the special permits you need (200e each).
So in other words it's almost impossible for "normal" people. Only one car has been made: http://sivut.koti.soon.fi/iirol/kotisivu/RA2_Eng.html
It was designed and built by a group of Finnish students of automotive engineering and industrial design.
And if you tune or change the engine you have to have brakes and anti-rollbars etc. from the highest spec model.
And there are a couple of other laws as well:
You can have 20% more power than the most powerful engine (133bhp+20%=only 159,6%)
The displacement can be 25% more than the biggest engine. (1800+25%=2250, not a problem then)
The new engine can be 25% heavier than the heaviest engine. (not a problem)
These are the laws that cause the most problems. But there are lots of other irritating laws.
- Fez
- Senior Poster
- Posts: 380
- Joined: Fri Jul 12, 2002 7:48 pm
that system is very similar to the way we decide if a car is q plated in this country
the only thing is this is no where near as strict as what u describe
the only thing is this is no where near as strict as what u describe
- MadcatCraig
- BANNED SELLER
- Posts: 4035
- Joined: Wed Jul 04, 2001 1:00 am
- Location: Bristol
6 posts • Page 1 of 1
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