How do they vary with the GT cams though, what are the gains and downfalls? I like the ammount of torque the Gt cams create lower down and apparently the dip through the mid range is normal for a cammed car? Just from what Fred told me ofcourse, I've never looked to much into the N/A side of these engines
How much are 438's fitted and mapped?
I must admit low down torque is not the 438's forte.
Im getting 438s fitted in 2 weeks, will let you know how I get on. Im running ITBs so should see an improvement.
nope all present and correct.
To confirm a few things on the 438's (and reinforce what Danny has said). My car is a 172 with PAS, AC, exhaust and the prototype K-Tec induction kit;
Idle - not a problem, very smooth, almost the same as standard. I use the car as a daily and it's perfectly happy sat in the commute.
Performance - I gained 22 bhp and 8lb ft
'Feel' - under 4k a slight difference, with a bit of induction noise. As you go past 4k and into the 5's the car just starts pulling like a train, and the noise is epic, right upto the limiter.
This makes the car very drivable, as if you want to potter along in traffic and save mpg just change up at 3k, if you want to fly around like a bat out of hell or for track work just work the box and your changes differently to hover at 4.5k.
The link to my project thread and graphs is here if people haven't seen it;
Comparable results that I know of, all with 438's;
Laine 16v - 192 bhp
me - 197 bhp
tank - 203 bhp
Looking at Sams results I think both 438's and Gt cams will give a good result if fitted and mapped correctly.
If anyone is unsure on the 438's and is near Reading then pm me and I'm more than happy to show them / take them out in the flamer for them to see first hand.
Last edited by Cub.; 27-04-2012 at 07:56.
Interesting, although you netted 5 more horses compared to mine i just nudged past your peak torque (166.9), engines are strange creatures.
I've just rebuilt my engine and matched my inlets so will be getting back to the RR when i can to see how things have changed, ktec RR day anyone?
Mine is at K-Tec at the moment, replacement gearbox with a Gripper Diff going in it. Timing couldn't be worse from a cost perspective as I've just proposed to the other half and raiding my savings for the car has not gone down well, as that was 'wedding fund' - or so I am told!
When its all fixed up, i'll be up for another RR day. Be interested to see what yours makes after the rebuild and the matched inlets, drop me a pm when you know. Be good if it goes over 200+ like Tanks.
Out of interest Cub 172 do you know the powers of the 3 cars listed before cams?
Ive just had 438's put in my 172 with matched inlets decat and a 4-2-1 exhaust manifold and a k & n apollo ram air kit and the garage started it yesterday on the standard ecu and it ticks over rock steady at 750 rpm im just waiting for them to fit a unichip and get it on the dyno and give it a tweak results will be up soon.