Uprated cams

caney

Full Member
Apr 24, 2005
600
0
Did this Corrado owner have his engine built or tuned at Jabba sport per chance?

We did a few different cam development profiles for Jabba sport for a big power Corrado and one of the trials was with NA cams?

Kind Regards

Garry
Product Development Dept
correct:)
 

PiperRS

Exhaust and Camshafts
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 :D
 

audiman

I love boost
Nov 16, 2003
53
0
YEOVIL
Visit site
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.
 

Poverty

Guest
What are the main advantages of the cams. Increased RPM limits?
 

PiperRS

Exhaust and Camshafts
this bit seems a weird thing to quote..
its direct actuated on 20v.. no rockers..
:confused:

thanks for the info post.
:thumbup:

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
 

ibizacupra

Jack-RIP my little Friend
Jul 25, 2001
31,333
19
glos.uk
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


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.
 

PiperRS

Exhaust and Camshafts
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 :)
 

ibizacupra

Jack-RIP my little Friend
Jul 25, 2001
31,333
19
glos.uk
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.
:thumbup:
 

wild willy

Full Member
Aug 4, 2003
2,323
0
Wales
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.
 

PiperRS

Exhaust and Camshafts
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 :D:D

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
 

grahams81

Active Member
Oct 14, 2010
1,165
6
County Durham
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 ???
 
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