Quote:
Originally Posted by RJasonKlein
Hey, everyone - here's the update we've been waiting for. I got a response from Piper directing me to Tim Radley at Race Developments, who has been working with Piper while developing several neat items for our platform. I sent him an e-mail and here's the response I got from him: Hi Jason,
I'm running the soft spec cam in my current build. See attached dyno chart. These drive just as a normal car and i'm running a Motec ecu. In fact with the mapping, it's significantly better than stock and doesn't have that torque lurch at low throttle openings that causes many drivers of these cars to stall at junctions. The graph shows the improvement going from stock car to cams, blueprint and exhaust then mapped on Motec. Also that runs the Piper single springs and i'm running the engine to 8000rpm safely for 1500 miles now.
It actually goes a lot better than the dyno chart would suggest. Here is an in-car video doing a launch on a cold day on stock tyres.
Hits 60mph in 2nd gear but on stock rubber the grip is very poor. I've got some new wheels and tyres to go on in 2 weeks and also some new dampers. I'm confident it will do mid to high 5's to 60 as it is with all that.
Next I will try the 3462/3465 spec cam from Piper along with their dual springs. I think these will add 10bhp more on stock setup but the problem with this engine is the intake manifold. The design is bad.
A lot of people are struggling with this engine to get power, even the race guys when NA. I'm confident it can be good but it requires quite a few parts changing.
I've got everything for a turbo build after and will run a sequential box so there will be lots of development coming off the back of this. I don't want to do turbo until i've proven out the NA stuff a bit more first though.
Also will be looking at a dry sump option too.
Regards
Tim Tim is actually on this forum, so maybe he can jump in and give us more information as he continues his development work. Lastly, he supplied a picture of the dyno chart, so I'll attach it below. |
Quite amazing that it appears that arround 200whp on a dynojet is the max you get NA
you can get their with cheap headers and E85
or petrol cheap headers and full exhaust
or ultra expensive headers stock exhaust on petrol
or cams head work and likely headers and exhaust as per @
Tim Radley
appears something at that power level is holding it back.