5 replies to this topic

[minihurles]

Hi my name is chris. Have not been on for a while i have a 998 standed engine just want to know the best way to do this. I use it daily and just want to know what other people have done and the cost and time involed. Any help would be greatfull thanks chris.

[George929]

Use the search function

Theres been Plenty of posts on this before

[minihurles]

Use the search function

Theres been Plenty of posts on this before

thanks still new to this site chris

[Stevee]

stage one tuning kit

[twrminisport]

On a 998. First things first.
Make sure all your standard stuff is working properly. You cant tune a badly running engine.
New plugs HT leads points condenser dizzy cap oil filter change oil change and a new radiator cap will all be on this list.

Larger bore exhaust which you can have in a 'large bore single box' or 'small bore twin box' variant. Not much difference. Choice. better noise go for the single box. however an extra 1 bhp 2 bhp can be found from twin box system particulaly through accelleration. And a new manifold. Maniflow or similar.
Different air filter element. Not a shitty pancake things some people will try to sell you but a proper k and N cone filter or similar.
Different carb needle.
This is basially what a stage one kit is
After that ROLLING ROAD. Get it optimised by a MINI frienddly rolling road.

You can do that service for about £40 and the stage one kit for about £120-£150 if you know where to look. Then the rolling road prices vary per hour. usually about £40-60 per hour and they may take an hour and a half so you can see this listed above can be done definatley for under the £250 mark. This will have given your car a freshen up and a better breathing external system. Power gains for this maybe around 25% increase.

Next you will look at the head for options. a cooper head 12g295/12g206 is the eaisiest because unlike the 1275 heads you will not have to pocket the block or resess the valves. A new head can be found on ebay for about £150 then fitted but i would advise stongly having new seals fitted and having it checked over properly with the possibility of new valves/guides etc. REMEMBER YOU MIGHT HAVE TO DO AN UNLEADED CONVERSION. There are many companies who do these heads for you but expect to pay in the region of £500 for one already done for you 'as new' spec. This again you will need to have rolling roaded when finished so expect to pay about £300 for a second hand head or £700 for a new one (all in prices) but expect another 25% power increse at least.

Rockers. 998 need little more than standard. Extensive testing by Calver and Vizard etc have shown the standard units with an acclaimed 1.25.1 to produce little more than 1.22.1 on a good day therefore a 1:3:1 roller rocker is a good upgrade. 1.5.1 is too much for the 998 really. 1:3:1 is optimum until about 85bhp so unless you are running a 100bhp small bore 998 miglia spec then 1:3:1 is for you

Carburation. 2 main choices here. with an upgrade to a HIF44 carb or a twin HS2 set up or even a reese-fish or other set up. Expect to pay about £50-£150 for a decent HIF44 carb and buy a decent filter and needle for this.
HS2 carbs expect to pay more like £100-£200 for a carb setup to refurb and fit with new needles butterflies etc. but you will need a twin manifold, heatshield, etc, This is the more expensive way to go. The vast majoirty of people stick to HIF44 carbs for ease of use and price but the twins will give you a better power on a 998 but are possibly arguably not worth the extra over a hif 44
NOTE: with all carbs expect to have to fit new service parts within the carb.


^^ Pictures of my twin HS2 setup with custom made Pipercross airfilter.

Other considerations:
The mini cooling system is far too good so dont mess around with that. However if experiancing overheating then fit a lower thermostat and consider a 2 core ally radiator.
Electronic ignition, Aldon ignitor or something similar maybe a peronix system for about £80 can go a long way to sorting dizzy and timing problems if present aswell as eliminating the need for points.

After this:
Camshafts, 998 tuning you will not want a camshaft with a duration of more than 270 degrees. This is ultimate for a 998.
Kent 276 therefore is the max. Pulls from 1500-6000. Lumpy idle
Swiftune Sw5-07. Less cammy on idle. Pulls from 1200. Flies from 3500. Bit more tame than the 276. This one is the performance increase that you dont know is there. Great for motorway miles and sitting in traffic in town.
Make sure you fit an adjustable duplex timing gear. No point in shelling out on a new cam without timing it correctly. Off the mark a cam will give more of a bang for your buck than a head.
A brand new sw5-07 full duplex kit can be bought for £250. Again ROLLING ROAD.

Flywheel and clutch, next is to lighten the flywheel. A full featherlight flywheel and clutch assembly can be purchased from swiftune for £680

Further options
Lightened and balanced crank
Lightened rods

Sorry for the in depth awnser ask me if you want to know more ask me

Jesus

Edited by twrminisport, 01 March 2011 - 09:28 AM.

[minihurles]

On a 998. First things first.
Make sure all your standard stuff is working properly. You cant tune a badly running engine.
New plugs HT leads points condenser dizzy cap oil filter change oil change and a new radiator cap will all be on this list.

Larger bore exhaust which you can have in a 'large bore single box' or 'small bore twin box' variant. Not much difference. Choice. better noise go for the single box. however an extra 1 bhp 2 bhp can be found from twin box system particulaly through accelleration. And a new manifold. Maniflow or similar.
Different air filter element. Not a shitty pancake things some people will try to sell you but a proper k and N cone filter or similar.
Different carb needle.
This is basially what a stage one kit is
After that ROLLING ROAD. Get it optimised by a MINI frienddly rolling road.

You can do that service for about £40 and the stage one kit for about £120-£150 if you know where to look. Then the rolling road prices vary per hour. usually about £40-60 per hour and they may take an hour and a half so you can see this listed above can be done definatley for under the £250 mark. This will have given your car a freshen up and a better breathing external system. Power gains for this maybe around 25% increase.

Next you will look at the head for options. a cooper head 12g295/12g206 is the eaisiest because unlike the 1275 heads you will not have to pocket the block or resess the valves. A new head can be found on ebay for about £150 then fitted but i would advise stongly having new seals fitted and having it checked over properly with the possibility of new valves/guides etc. REMEMBER YOU MIGHT HAVE TO DO AN UNLEADED CONVERSION. There are many companies who do these heads for you but expect to pay in the region of £500 for one already done for you 'as new' spec. This again you will need to have rolling roaded when finished so expect to pay about £300 for a second hand head or £700 for a new one (all in prices) but expect another 25% power increse at least.

Rockers. 998 need little more than standard. Extensive testing by Calver and Vizard etc have shown the standard units with an acclaimed 1.25.1 to produce little more than 1.22.1 on a good day therefore a 1:3:1 roller rocker is a good upgrade. 1.5.1 is too much for the 998 really. 1:3:1 is optimum until about 85bhp so unless you are running a 100bhp small bore 998 miglia spec then 1:3:1 is for you

Carburation. 2 main choices here. with an upgrade to a HIF44 carb or a twin HS2 set up or even a reese-fish or other set up. Expect to pay about £50-£150 for a decent HIF44 carb and buy a decent filter and needle for this.
HS2 carbs expect to pay more like £100-£200 for a carb setup to refurb and fit with new needles butterflies etc. but you will need a twin manifold, heatshield, etc, This is the more expensive way to go. The vast majoirty of people stick to HIF44 carbs for ease of use and price but the twins will give you a better power on a 998 but are possibly arguably not worth the extra over a hif 44
NOTE: with all carbs expect to have to fit new service parts within the carb.


^^ Pictures of my twin HS2 setup with custom made Pipercross airfilter.

Other considerations:
The mini cooling system is far too good so dont mess around with that. However if experiancing overheating then fit a lower thermostat and consider a 2 core ally radiator.
Electronic ignition, Aldon ignitor or something similar maybe a peronix system for about £80 can go a long way to sorting dizzy and timing problems if present aswell as eliminating the need for points.

After this:
Camshafts, 998 tuning you will not want a camshaft with a duration of more than 270 degrees. This is ultimate for a 998.
Kent 276 therefore is the max. Pulls from 1500-6000. Lumpy idle
Swiftune Sw5-07. Less cammy on idle. Pulls from 1200. Flies from 3500. Bit more tame than the 276. This one is the performance increase that you dont know is there. Great for motorway miles and sitting in traffic in town.
Make sure you fit an adjustable duplex timing gear. No point in shelling out on a new cam without timing it correctly. Off the mark a cam will give more of a bang for your buck than a head.
A brand new sw5-07 full duplex kit can be bought for £250. Again ROLLING ROAD.

Flywheel and clutch, next is to lighten the flywheel. A full featherlight flywheel and clutch assembly can be purchased from swiftune for £680

Further options
Lightened and balanced crank
Lightened rods

Sorry for the in depth awnser ask me if you want to know more ask me

Jesus

hi thanks for the in depth answer alot of options to go with.something to think about and go with the best option many thanks chris