13 replies to this topic

[josh.evans]

Hi if i havn't put one that you think is a good upgrade please post it up.

thanks

[analogue_radio]

Have a search mate.

[Bungle]

1275

[skaterava]

If you want to stick with 998, i'd say camshafts/electronic ignition is next. 1275 swap would be better, but roudy youths such as myself can't afford the insurance on engine swaps.

[BoboGib]

It all depends on what your after from the car.

I wouldn't bother with the rockers, however if you are changing the cam then a set of 1.3:1 rollers rockers would be good as they reduce side loading (apparently).

One of the best cam upgrades for the 998 is to put an MG Metro cam in, not a turbo one. Think it is around a 266. As for head, any upgrade over the standard one would be good. All depends what you can afford.

[BoboGib]

Why do people always say stick a 1275 in? He has asked how to tune a 998, there is nothing wrong with them.

[josh.evans]

right okay can the cam be changed with the engine still in and i dont want to go to a 1275 because of the insurance

josh

[liirge]

if you want some ideas, you can check my build thread in the sig (Not at all shameless plugging )...

but your best bet is to..

get a 12g295 Cooper cylinder head, get it skimmed to the right compression, around 9.5 or 10 to 1, you should notice a difference with that, then you hit the Camshaft change, something like an SW-5 will complement that head for nice torquey mid range. then for reliability and a little extra move over to a custom advance curve on the ignition side, wither an electronic dizzy module, or hit the mappable ignition job, i.e megajolt, a lot of people wont agree with me, but for some more midrange torque get some Twins on there!

if your after more power after that, then you have to go a slightly different approach, but you loose alot of drive ability

Edited by liirge, 23 April 2010 - 04:35 PM.

[Rich.]

Turbo....

[lawnmowercrap]

1275 with a 998 engine code attatched.


No point in doing a cam seperate to the roller rockers. Might as well do both at the same time. And i'd fit a kent 266 or an Naturally Aspirated MG Metro cam with 1:3 minisport rollers on a 295 cooper head with a freeflow manifold. then i'd drop a HIF38 on it.

[Scallywag630]

Big bottle of nitrous!!!!!!

[liirge]

1275 with a 998 engine code attatched.


No point in doing a cam seperate to the roller rockers. Might as well do both at the same time. And i'd fit a kent 266 or an Naturally Aspirated MG Metro cam with 1:3 minisport rollers on a 295 cooper head with a freeflow manifold. then i'd drop a HIF38 on it.

Sorry wrong about that one! a higher lift cam can cause problems when being used with roller rockers especially the 1.5's as you can experience spring crush, you need to check this if your going to fit them, your best off keeping to the rockers you have ensuring that the rocker shaft is in good condition, as the on the spec you have they will make little to no difference, on top of that they are very expensive. 266 cam has mixed reviews on here..

[mattdc2r]

I've got a 998, and gonna (Eventually) go down the supercharger route. I say eventully as I'm intending on doing it properly, rather than just fitting the de-compression plate.

[leaky]

I'v got a 998 with a 1275 head on it with the block pocketed and a stage 1 kit. Has quite alot of torque. I still want to up grade it abit more as well though but I'm not really sure what else to do after that.