Quote:
Originally Posted by Roffle Waffle
how much torque does the car put down stock? 300rwtq doesn't sound high for a kit, although I've never driven an ess stage 2 z4m
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That's a good question. The devil is in the details with this one
The stock tq is already weak for the Z4 M and the stock tq at max RPM is just down right terrible. This means that the tq drops off drastically from a peak of about 230-240 depending on car at 5500rpm to about 175-180 tq at 8200rpm. This why many people complain that the car seems to give up the ghost at 7000rpm. With the ESS VT2-500 the tq maxes at 300+ at 5500rpm and continues or holds that tq to redline. You feel a constant and strong pull right to redline and in fact it's very easy to bounce the rev limiter if you're not paying attention. With headers and water/meth my tq should be closer to 330-340 (which means my tq will be double the stock tq at redline!!!) climbing all the way to redline which is a hard pull. I included a stock Z4 M dyno and my Dyno from last summer. Keep in mind my car would probably dyno more like 475-480 in 45f temps with stock headers. Compare the two tq curves and notice how drastically the stock curve falls off...this equates to weak pulling car as opposed to a constant(flat line or slight rise) tq curve with FI. Cheers
One extra note:: on my dyno notice the tq drop at 7600-7700...this is from heat soak and timing being pulled, it was 94 F. With water/meth this would not happen and would likely still be rising to about 310-320 tq. This is why I feel every FI application should have water/meth.