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Uprated cams
- Thread starter az20vt
- Start date
Ah, i remember 
The cams we did for him in the end worked really well if i recall. Did not reduce the low down torque anywhere near as much as the NA cams but i think this was something to do with the cam timing rather than cam profile i seem to recall.
Is it still going okay? Was it 2 or 4wd, i cant remember?
Got a mate with a 400+ gee gee Corrado (1.9 8v Turbo) and 2wd. Is bloody good fun
The cams we did for him in the end worked really well if i recall. Did not reduce the low down torque anywhere near as much as the NA cams but i think this was something to do with the cam timing rather than cam profile i seem to recall.Is it still going okay? Was it 2 or 4wd, i cant remember?
Got a mate with a 400+ gee gee Corrado (1.9 8v Turbo) and 2wd. Is bloody good fun
Low end grunt?? WTF is that with a GT30?? LOL. Yeah, what you gain at the top, you will loose at the bottom with the NA cams. However, if you boost profile is 4-7.5k flat, then you keep it in those revs if you want it to go fast. Also CR makes a huge difference.
Yeah, you need to make sure the C/R, Turbo, Head, Cams and Manifolds all match and suit a given application. Its hard work but really pays off when you get it right
Poverty
Guest
You increase rpm limit with the map/software if you are happy to and it is worth it. Cams give more power but are also known to move the power further up the rev range.
this bit seems a weird thing to quote..
its direct actuated on 20v.. no rockers..
thanks for the info post.
this bit seems a weird thing to quote..
its direct actuated on 20v.. no rockers..
thanks for the info post.
lol, yeah, i know, its an odd way of doing it. basically means that what you see at the cam, you also see at the valve
Its the way alot of European and Americans look at it. Odd i know If you wanna do any testing with Cams bill just let us know and im happy to see if we cant improve on what you have got
The profiles listed are our basic stock specs that cover most applications but we can always try something special if your engine needs that bespoke spec.
Kind Regards
Garry
Product Development Dept
lol, yeah, i know, its an odd way of doing it. basically means that what you see at the cam, you also see at the valve
If you wanna do any testing with Cams bill just let us know and im happy to see if we cant improve on what you have got
The profiles listed are our basic stock specs that cover most applications but we can always try something special if your engine needs that bespoke spec.
Kind Regards
Garry
Product Development Dept
Good to know.
cheers for the info..
determining lift on hydro's however for timing them in is'nt accurate.
Do you do vernier gears?
I run CatCam specials currently. Work ok, but no real reference in performance terms as I went form std to these and changed turbo @ same time.
We have done the external pulley but we couldnt make the internal ones without making steel billet cams and incorperating the sprocket on it in this manner.
Yes with hydraulics its near impossible. We advise customers to do a dummy build with a solid follower, then mark some dots on the pulley. Then you stick the hydraulics back in and re align the dots.
Always happy to try new stuff
Yes with hydraulics its near impossible. We advise customers to do a dummy build with a solid follower, then mark some dots on the pulley. Then you stick the hydraulics back in and re align the dots.
Always happy to try new stuff
We have done the external pulley but we couldnt make the internal ones without making steel billet cams and incorperating the sprocket on it in this manner.
Yes with hydraulics its near impossible. We advise customers to do a dummy build with a solid follower, then mark some dots on the pulley. Then you stick the hydraulics back in and re align the dots.
Always happy to try new stuff
I'll bare that in mind.
Ok, the million dollar question..... is it possible to increase the power of a 20vt engine with a cam upgrade and not loose any drivability or power / torque across the rev range.
Nope
Sadly its a fairly simple answer. You hotter the cams you fit, the more power you get at the top end, but sadly the more lower down torque you lose.
The basic reason for this is, in order to get more power, you open the valves further and for longer to allow the increased volume of charge into and out of the cylinders. This is good at the higher RPM where it is designed to work, now when your down at the lower rpm, the inlet manifold preasure is lower due to the greater overlap with hotter cams, so the car runs more lumpy than standard and it takes more rpm to get the flow right and the engine to run smooth.
Now, im not saying that all cams will make your car run rough and lose lots of power at the lower RPM when fitted, its very important to fit the right cams in the right application and ones that compliment the modifications you have. F1 and touring car for example have very very hot cams because they need lots of power and they are prepared to go to the higher rpms to get it. As they dont use the lower rpm during a race they dont need the power down low so they are prepared to sacrifice it in order to get power where they need it. Now on the flip side, you have WRC. They are limited to 300bhp so what they want is to get as much torque as possible and the widest powerband, in order to get this they run low lift, and low duration profiles to get their goal, to them, their is no point in having 300bhp at 9000rpm when they can have it at say 5000 - 6000rpm and bucket loads of torque.
Its very much about choosing the right cams for the right application.
We offer 3 off the shelf profiles to try and cover most of these applications.
Fast road - for cars that want to keep std turbo but have exhausted most other mods and want more still. You will lose a little low down power but with good mapping (as in all cases) it will still be drivable and worth the gains.
Ultimate road - for cars with either standard turbo (and really wanting every bhp possible) or big turbo cars that want to get that extra flow into the engines better. In BT applications these act like fast road cams. A lose in lower down power is unavoidable but if you have gone to the effort of big turbo or full on little turbo and still want more power then it is again worth the gain.
Competition/Track day - For use on non road going cars where lots of power is the goal, these will work exceptionally well at moving you at high speed in the right engine. They are quite hot and as such do lose quite a bit of your low down power but the gains at the top end make it far worth it
Like everything tho, its a very subjective subject. Its a bit like someone who normally drives a diesel car then driving a petrol car, he would say "gosh, their is no low down torque at all" but he would not probably say that the car was undriveable. Someone on the other hand might. Its a bit like our exhausts, at what point would you call it loud?
i hope this answers your question and helps anyone else who reads this
Kind Regards
Garry
Product Development Dept
Sadly its a fairly simple answer. You hotter the cams you fit, the more power you get at the top end, but sadly the more lower down torque you lose.
The basic reason for this is, in order to get more power, you open the valves further and for longer to allow the increased volume of charge into and out of the cylinders. This is good at the higher RPM where it is designed to work, now when your down at the lower rpm, the inlet manifold preasure is lower due to the greater overlap with hotter cams, so the car runs more lumpy than standard and it takes more rpm to get the flow right and the engine to run smooth.
Now, im not saying that all cams will make your car run rough and lose lots of power at the lower RPM when fitted, its very important to fit the right cams in the right application and ones that compliment the modifications you have. F1 and touring car for example have very very hot cams because they need lots of power and they are prepared to go to the higher rpms to get it. As they dont use the lower rpm during a race they dont need the power down low so they are prepared to sacrifice it in order to get power where they need it. Now on the flip side, you have WRC. They are limited to 300bhp so what they want is to get as much torque as possible and the widest powerband, in order to get this they run low lift, and low duration profiles to get their goal, to them, their is no point in having 300bhp at 9000rpm when they can have it at say 5000 - 6000rpm and bucket loads of torque.
Its very much about choosing the right cams for the right application.
We offer 3 off the shelf profiles to try and cover most of these applications.
Fast road - for cars that want to keep std turbo but have exhausted most other mods and want more still. You will lose a little low down power but with good mapping (as in all cases) it will still be drivable and worth the gains.
Ultimate road - for cars with either standard turbo (and really wanting every bhp possible) or big turbo cars that want to get that extra flow into the engines better. In BT applications these act like fast road cams. A lose in lower down power is unavoidable but if you have gone to the effort of big turbo or full on little turbo and still want more power then it is again worth the gain.
Competition/Track day - For use on non road going cars where lots of power is the goal, these will work exceptionally well at moving you at high speed in the right engine. They are quite hot and as such do lose quite a bit of your low down power but the gains at the top end make it far worth it
Like everything tho, its a very subjective subject. Its a bit like someone who normally drives a diesel car then driving a petrol car, he would say "gosh, their is no low down torque at all" but he would not probably say that the car was undriveable. Someone on the other hand might. Its a bit like our exhausts, at what point would you call it loud?
i hope this answers your question and helps anyone else who reads this
Kind Regards
Garry
Product Development Dept
Hi Garry,
I've just started to build a 2.1 Stroker engine using a TDI 95.5mm crank & 83mm JE forged Pistons.
I'm using a large port head & planning a gt3071 for around 400hp
As its a stroker engine it probably isn't going to rev that high so would your Ultimate Road Cams be well suited or would the engine need something bespoke ???
I've just started to build a 2.1 Stroker engine using a TDI 95.5mm crank & 83mm JE forged Pistons.
I'm using a large port head & planning a gt3071 for around 400hp
As its a stroker engine it probably isn't going to rev that high so would your Ultimate Road Cams be well suited or would the engine need something bespoke ???
correct
Just out of interest was your TT up at Jabbasport about a month ago. Swear your profile pic is the engine bay I saw lol. If it is it sounds awesome and the engine bay is perfectly done
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