we are wondering if mybe we have some dirty injectors, when you take off from a start the car takes a minute to kick in like till 5 or 10 then it will take off fairly quick dont know if this is the case dirty injectors or maybe the 3100 is just a big old kitty
Possable low fuel pressure caused by clogged fuel filter. Change the filter first. If problem is still there take a fuel pressure reading. Should be aprox. 38 psi. at idle.
In today's standards it is a kitty. 0-60mph should be about 8-8.5 secs. In 98 155 hp/185 ft/lbs was respectable for a fairly light compact but now it is low since there are 4 cylinders from Nissan with 175hp.
I believe it's a split single exhaust. Putting duals on it probably would not give you that much anyway. The 3.1 is a snotty little engine but it's no race horse. Unless you were willing to pour thousands into the car you're not going to find any cheap and easy instant horsepower.
Hell if I know if it's running fine now. I don't know if it's running like a 3.1 should or worse. Is it a kitty? Depends on how you define a kitty and how you define a tiger. I'm just saying you aren't going to improve a
3.1 much with cheap tricks. Horsepower costs money, takes time and requires knowledge. Any 6 cylinder on the road today can be made to produce 300HP with relative ease if you know what you're doing and want to invest the cash. No 6 cylinder on the road today is going to dramatically change character with a hundred dollar bolt on solution... despite what the marketing claims state.
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