Hi all,
Im stumped, and so is my mechanic / tuner... I need some good advice please.
Here's the story:
I have an R32 Gtst which I put an R33 S1 RB25DET into a while ago and I have been building it up for about 12 months to try and get some serious power, I have put all of the goodies on it that I know I will need to make the power but after spending over 4 hours tuning on the dyno we have only managed to get 233rwkw and 550nm from it, its running a consistent 11.7 - 1 AFR and pretty solid boost = 17 - 18psi at the manifold.
Im not happy because I know that there is so much more power waiting to be unlocked, it should make around 260 - 270rwkw but it just wont...
Im not a mechanic and I dont know how to tune a car either but I am fairly good with a spanner and I know enough to get me by, but my local tuner said to me that he couldnt get anymore power from my car even running 21psi!
The modifications include:
*Power FC
*Splitfire DI ignition coils (NGK iridium plugs, gapped to 0.8mm)
*SARD 550cc injectors
*Bosch 040 fuel pump
*3 inch mandrel dump pipe - full 3 inch mandrel Tannabe exhaust system with 3.5 inch high flow "metal cat"
*Large front mount intercooler (300x600x75mm), Turbosmart supersonic BOV
*GCG Garret GT30/71R ball bearing turbo
*Turbotech manual boost controller
I have checked to see if the cat is blocked and it isnt and the O2 sensor seems to be working fine, however I dont know if one or both mufflers are partially blocked in the exhaust.
What could possibly be keeping my engine from making peak power?
Can anyone help?