Piper Cams

The Oily Bits S2 Specific Topics
1

From http://www.ptp-ltd.co.uk/shop/ProductDetails.aspx?productID=701

PTP can now offer a pair of fast road performance camshafts for the Mk2 Lotus Elise and Exige using the Toyota 1.8 VVT-Li 190bhp engine (with Variable Valve Timing & Lift � intelligent VVTL-I system) As standard the 1.8 VVT-I engine suffers from a �dip� in the torque curve. The new camshafts have been designed to cure this problem and give a constant torque curve throughout the rev band The new fast road camshafts with give another 10bhp at the top end and, more impressively, another 25lb/ft at 5800rpm. (As independently tested by P.B.Racing Lotus specialists in Italy)

Anyone gone with this or care to comment?

Cheers
Rob

2

Sounds interesting. I’d need more info before taking things further though.

Prices???

Tim.

3

These cams appear to work very well according to http://monkeywrenchracing.com/pipercams2zz.html

but I’m a bit concerned that they gave the best results with a power commander piggyback ECU. I think that an Exige with these cams and a modified exh manifold and cat would really fly and hopefully fill in the 5000rpm torque dip. I dont like piggyback ECUs as the original ECU usually starts fighting against the piggyback and you just cant tell whats going on. To do the job properly you’d have to fit a pretty trick MOTEC/DTA and spend yonks on the dyno mapping it all out. Hopefully some nice tuner will come along and crack the stock ECU and modify the base tune.

At �600 for the cams, they aren’t cheap but then again they aren’t you average cam. Installation wont be cheap as the VVTLi will all have to be set with vernier clocks I bet (unless you can lock them in place with a bar etc).

PB Racing (http://www.pbracing.it/) reckon you can get 235BHP and a good hike in torque but I want to see someone else try it before I have a go!!

4

I wouldn’t want to touch the ECU. This looks good enough to me, especially how it fills in the hole in the std torque curve:
[image]http://monkeywrenchracing.com/images/Dyno/ST2vsSTK-Stock.jpg[/image]

5

bleedin heck… fills the hole ?

looks like the screen on my computer when i’m playing me MP3’s…

6

bleedin heck… fills the hole ?

looks like the screen on my computer when i’m playing me MP3’s…

Yeah, but compare it to stock and it’s less peaky, although I guess it’s like saying Everest is less peaky than K2

7

PB Racing (> http://www.pbracing.it/> ) reckon you can get 235BHP and a good hike in torque but I want to see someone else try it before I have a go!!

As the car gets nearer coming out of warrenty this is starting to seem more appealing.

Any ideas on what other mods they needed to get to that figure?

8

Its got an air filter and exhaust (manifold and cat too I think), a ported head and a fuel pressure regulator.

They claim 220 without the head mods and to be honest I wouldn’t touch the head as one slip with the die grinder touching the plasma sprayed valve seats and the heads scrap. You wont be able to re grind the seat and you cant fit inserts as the valves are too big.

But 220BHP without the 60kilos of lard the S carries around sounds tempting. I’ll be out of warranty in sept too!

Oh yeah and it costs �3900