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with just one stock TT pump, however up in the higher RPM fuel pressure does start to fall and you have to tune accordingly. If it's an orginal stock TT pump with higher mileage on it we often see the same thing happening at around 600rwhp. If building a car capable of over 600 rwhp I would suggest going with dual pumps. Actually we completed and tuned 3 Z32s making over 600 whp last week, one was producing over 700rwhp so it it really isn't that uncommon for us at least. I'll be putting one of these new controllers in my car when Ash gets them ready. If it works out and we like we will be recommending them to our customers pushing 600+.
Russell Floyd Z1 Motorsports www.300zx.com 1990+ Nissan Z specialists Used Parts, New parts, Service/Repair and Performance Z1 Motorsports Exclusive Parts Line 2877 Carrollton Villa Rica Hwy Carrollton, Ga 30116 770-838-7777 770-832-9253 (fax) 
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