Best aftermarket cams for 9a

[samthegram 10]

I have done a search in this section and can't find anything that quite answers what I need, so the question is.....

Are there any aftermarket cams that increase the power and torque across the range and not just increase power at the top end?

I know of ones available from Schrick, Kent and Piper but what do I need to look for? I'm not quite sure what 268/270/272 actually means.

 

Current engine spec and power run graph after a rolling road tune;

 

2ltr 16v with;

Kr inlet and 9a outlet cams,

ported and rebuilt head,

smoothed,ported and gasket matched 50mm inlet manifold,

knife edged and ported throttle body,

cold air feed into airbox with K+N filter,

14mm silicon ht leads,

JE forged pistons (slightly up on compression 11.2 : 1) ,

lightened and balanced flywheel,

solid front and poly rear engine mounts,

Heat wrapped 4 branch into 2 1/4" 2 box system (with de-cat)

LGIM0440.jpg[/attachment:xcckammx]

As you can see it is currently pushing 180bhp with 145 lb/ft , Would aftermarket cams be worth it or would they just raise it at the top end?

Also would a vernier cam pulley be of any use or are they only good when converting to megasquirt or the like?

I am keen to see if I can make 200bhp but want to keep the original ignition and injection system , is this possible or will I have to rev it to 9k? :lol:

Any help/ideas are appreciated. Sam.

P.S car is also semi stripped/lightened to about 1035kg so big torque not needed.

[samthegram 10]

Come on Davidwort, you must have some ideas? :lol:

[harryc 0]

Some 260 duration would be good for midrange along with a 42mm inlet mani. Are you running standard management? Thought about ITB's?

[corradophil 3]

Whatever you get, you need to make sure you can get the fuelling right or you are wasting your time and money.

 

I tried Scrick 268/276 cams in mine, and it was lumpy as hell, and down on power. I went back to KR spec cams.

 

Mine is a 9a, so it has KE-Motronic, which has a reputation for not being very tunable compared to the K-Jetronic, however I think I am getting somewhere with mine. Earlier this year I completely rebuilt the engine, including re-bore to 83mm bore and flowed head. After this it ran very badly, so I took it to Stealth, who confirmed it was running very lean, but they could not do anything with it. Since then I have done loads of research and adjustment. It now runs well, but I'm not sure how it would do with lumpy cams.

 

Is yours on K-Jet or Ke-Motronic?

[harryc 0]

Mega squirt might be an idea if the standard management hasn't got much room for adjustment.

[davidwort 0]

pair of ABF cams? cheap and another mm of lift over the KR cams.

really wild cam profiles just mean you need a 1500rpm idle and peak power and torque gets shifted higher up the rev range,

I drove a GTI engineering 2.1 club sport once, went like a wild thing but the smoothness of the bottom end was definitely compromised, think that had mild-ish shricks on it. (190 ish peak hp)

[corradophil 3]

pair of ABF cams? cheap and another mm of lift over the KR cams.

really wild cam profiles just mean you need a 1500rpm idle and peak power and torque gets shifted higher up the rev range,

I drove a GTI engineering 2.1 club sport once, went like a wild thing but the smoothness of the bottom end was definitely compromised, think that had mild-ish shricks on it. (190 ish peak hp)

 

It would be interesting to see a back to back comparison of KR cams Vs ABF cams.

[harryc 0]

Some very good info on comparisons here;

http://clubgti.co.uk/forum/showthread.p ... r+abf+cams

[harryc 0]

pair of ABF cams? cheap and another mm of lift over the KR cams.

really wild cam profiles just mean you need a 1500rpm idle and peak power and torque gets shifted higher up the rev range,

I drove a GTI engineering 2.1 club sport once, went like a wild thing but the smoothness of the bottom end was definitely compromised, think that had mild-ish shricks on it. (190 ish peak hp)

 

It would be interesting to see a back to back comparison of KR cams Vs ABF cams.

 

I reckon the difference would be negligable (if we re talking twin exhaust kr cams), maybe a slight improvement over stock kr cams?

[samthegram 10]

Whatever you get, you need to make sure you can get the fuelling right or you are wasting your time and money.

 

I tried Scrick 268/276 cams in mine, and it was lumpy as hell, and down on power. I went back to KR spec cams.

 

Mine is a 9a, so it has KE-Motronic, which has a reputation for not being very tunable compared to the K-Jetronic, however I think I am getting somewhere with mine. Earlier this year I completely rebuilt the engine, including re-bore to 83mm bore and flowed head. After this it ran very badly, so I took it to Stealth, who confirmed it was running very lean, but they could not do anything with it. Since then I have done loads of research and adjustment. It now runs well, but I'm not sure how it would do with lumpy cams.

 

Is yours on K-Jet or Ke-Motronic?

 

Mine is KE- Jetronic which I thought all 2ltr 16v 9a's were? Also I took it to Noble motorsport in Chesterfield who rolling road tuned it and managed to increase the fuelling to stop it running lean aswell as move the ignition advance on a degree or 2.

[corradophil 3]

Some very good info on comparisons here;

http://clubgti.co.uk/forum/showthread.p ... r+abf+cams

 

According to that thread the ABF cams seem the best std choice.

[corradophil 3]

Whatever you get, you need to make sure you can get the fuelling right or you are wasting your time and money.

 

I tried Scrick 268/276 cams in mine, and it was lumpy as hell, and down on power. I went back to KR spec cams.

 

Mine is a 9a, so it has KE-Motronic, which has a reputation for not being very tunable compared to the K-Jetronic, however I think I am getting somewhere with mine. Earlier this year I completely rebuilt the engine, including re-bore to 83mm bore and flowed head. After this it ran very badly, so I took it to Stealth, who confirmed it was running very lean, but they could not do anything with it. Since then I have done loads of research and adjustment. It now runs well, but I'm not sure how it would do with lumpy cams.

 

Is yours on K-Jet or Ke-Motronic?

 

Mine is KE- Jetronic which I thought all 2ltr 16v 9a's were? Also I took it to Noble motorsport in Chesterfield who rolling road tuned it and managed to increase the fuelling to stop it running lean aswell as move the ignition advance on a degree or 2.

 

All the info I have says the 9a is KE-Motronic.

 

From what I can make out

 

K-Jetronic - the basic system.

KE-Jetronic - As K-Jetronic, but with a narrow band lambda sensor and ECU which can alter fueling.

KE-Motronic - As KE-Jetronic, but with knock sensors and fully mappable ignition.

[Erny 0]

Sam I have a spare set of 9a cams if you would like to try the twin exaust cam mod, there yours for free I you want to come collect them, I live in Sheffield city centre, my friends 9a is rapid I'll ask him what cams he uses, I know he has a chip, and has spaced out his metering head and done the wur mod to help cope with the fueling, his is in a mk2 on k-jet he also has a few differnt gearboxes and different size wheels depending on what his driving situation is going to be, his box with longer 3rd is fun.