ClioSport.net
Register a free account today to become a member!
Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members through your own private inbox!
-
When you purchase through links on our site, we may earn an affiliate commission. Read more here.
CAT CAM 421.
- Thread starter ben_p
- Start date
TVR Cerbera
If you look at the catcams catalogue, it says standard parts for the 421 cams.
As for clearance i have 422's, which have similar lift and high comp pistons, and had no clearance issues
I hope your not upgrading from 428's, because you won't see much difference. If you are and haven't bought them yet, then get 422's, they are meant to be the best without going to solid lifters
TVR Cerbera
I have to disagree, Ben. I run itbs, pistons, 422's, head work and 240 bhp 180 ftlbs. and it pulls from 2000rpm
TVR Cerbera
Thought it was itb'd?
I make standard torque at 3000 rpm and at least 20 ftlbs over standard at a standard engine's peak torque and then go on to make 10 more 1000 rpm later.
I know you know your stuff, was trying to be informative
I know, no worries.
But I'm just talking about overall as you cannot compare to a stock engine as like for like. What you are trying to achieve is as effective a torque curve with as much area under the curve in the 90% use rpm range. There is no point him going for more cam if he is going to loose more than he gains.
An example, on a customers engine (not built by us) he went from 428's to 421's, gained 2bhp peak and lost everywhere else sub 6500rpm bigtime........although it held ontop peak for 500rpm more or so.
But I'm just talking about overall as you cannot compare to a stock engine as like for like. What you are trying to achieve is as effective a torque curve with as much area under the curve in the 90% use rpm range. There is no point him going for more cam if he is going to loose more than he gains.
An example, on a customers engine (not built by us) he went from 428's to 421's, gained 2bhp peak and lost everywhere else sub 6500rpm bigtime........although it held ontop peak for 500rpm more or so.
TVR Cerbera
I agree going from 428's to anything else is a bit of a waste unless the rest of the engine is as tuned to the same standard eg breathing, internally and externally
Clio Sport 172 ph1
Ben check my graphs, I'm pretty happy with my 421
This one is stock engine (just decat and air filter)
421 CatCams fully working on stock ECU with added RS inlet mani, and the car works fine for 6 months now, engine idle at 1200rpm as you foreseen but the rest is not so bad, I'm used to it by now
Not that bad below 6000rpm
I konw i'ts not perfect, only 10HP gain, but given the fact that it was all done remotely by Henk form fastchip I say is quite an achievement.
Clio Sport 172 ph1
Yes, that is exactly right. Nothing happens under 4000rpm just like it was old days. So are You seriously trying to tel me that this is so bad compared to the stock cams ?
ask cat cams
RS RIP
Ben check my graphs, I'm pretty happy with my 421
This one is stock engine (just decat and air filter)
421 CatCams fully working on stock ECU with added RS inlet mani, and the car works fine for 6 months now, engine idle at 1200rpm as you foreseen but the rest is not so bad, I'm used to it by now
Not that bad below 6000rpm
I konw i'ts not perfect, only 10HP gain, but given the fact that it was all done remotely by Henk form fastchip I say is quite an achievement.
Looks pretty damn good to me :approve: good torque, nice power
Clio Sport 172 ph1
I see what You mean.
I personally kind of like it (a little taste of turbo in N/A car
) but I got to admit, power output at low rpm is suprisingly good (I was told it will be totally lost, but the car goes like it uset to)As I said before my project is not done yet
Few adjustements to the inlet and exhaust are still to be made, than it's time for the final remap
but by looking at comparision of those 2 previous graphs it's going in the right direction.
ixell
ClioSport Club Member
Clio 172 cup phase 2
Thanks for the feed back
If you're interested I've got a pair of cams and mapped ecu to sell and that way would save you the cost of mapping.
Clio RS Mk2 PH1&PH2
Hi guys.
I see some dyno tests from Clio 172 Cup delivery stock around 180hp 185hp. They have a different compression ratio or what?
Similar threads
