Im now in the later stages of my engine's development hence:
1598cc, 16-valve, 4-cylinder Ecotec (X16XE); full engine re-build comprising of stage 2 cylinder head, oversize pistons, lightened and balanced crank; K&N 57i induction; custom Superchip; stainless steel exhaust system with Magnex cat replacement pipe and Mongoose backbox.
I have just had Velos fit a Torq Tube, which I am very pleased with and has given me an increase of 21bhp. The problem I am now faced with is the chip.
Whilst fitting on the rollers, Alan noticed underfuelling, being worse at low revs.
I have ran the car with the standard chip in and with the Superchip in. With the standard one, the engine is less responsive and generally feels slow.
With the Superchip, it is far more responsive, but more jerky, especially when slowing down. There is also a glut of power between 2000 rpm and 3000 rpm.
I am really unsure about what to do next.
Have the Superchip re-mapped to sort out the air/fuel mixture, which I understand can be a bit hit and miss, or go for a Unichip. I understand that the Unichip cannot increase the rev limit, whereas the Superchip already has this programmed in. Saying that, I very rarely drive to 7000rpm anyway!
BTW, what is the standard rev limit on a X16XE?
Any ideas/help/adice/donations welcome!