Best engine setup for turbo?

[Grendel]

Hey all,

I'm trying to figure out what to do to my motor when I rebuild it... I'm hoping to get 300-400 hp (would 10-15 psi get me to that kinda hp?) outta it (dunno if I can tho), but I'm not sure about a few things...

1) Camshaft - I heard someone on here say that the less valve overlap you have, the better... is this true?

2) Pistons/Rods/Etc - Someone was saying stock 280zx motors have really strong bottom ends, If I wanna run 10-15 psi, would I need a stronger bottom end? If so, whats good? Forged?

3) Compression - I know you want low compression for forced induction... what would be the best compression to run?

4) Injectors - I don't know the flow ratings on the stock injectors, but to run 10-15 psi, what size would I need?

I think thats all the questions I have for now... any replies would be appreciated...

-Grendel

[FYRHWK1]

Originally posted by Grendel
Hey all,

I'm trying to figure out what to do to my motor when I rebuild it... I'm hoping to get 300-400 hp (would 10-15 psi get me to that kinda hp?) outta it (dunno if I can tho), but I'm not sure about a few things...

1) Camshaft - I heard someone on here say that the less valve overlap you have, the better... is this true?

2) Pistons/Rods/Etc - Someone was saying stock 280zx motors have really strong bottom ends, If I wanna run 10-15 psi, would I need a stronger bottom end? If so, whats good? Forged?

3) Compression - I know you want low compression for forced induction... what would be the best compression to run?

4) Injectors - I don't know the flow ratings on the stock injectors, but to run 10-15 psi, what size would I need?

I think thats all the questions I have for now... any replies would be appreciated...

-Grendel

1- its not a set amount, and you need overlap for high rpm operation so its not really less is better, but there is too much. if the exhaust valve is open when charge (fresh air + fuel) starts coming in, its gonna fly right out the exhaust valve and you'll no only lose power, but your emissions will go sky high, and the fuel igniting in your exhaust will damage your cats over time. as for the cam talk to a good cam grinder, comp, isky, etc. and tell them your setup, redline, etc. and they can help out alot.

2-no clue, sorry, i dont know anything about 280ZXs but if you do go for replacement parts forged is the strongest you can get, but for 3-400 hp i think you should be fine with stock unless thers some real weak points.

3- the lower your compression the more likely your motor will be dependant on the turbo for power. theres static and theres dynamic compresison, if this were an NA(no turbo SC or nitrous) motor then an 8:1 static compression motor will have closer to 7:1 dynamic because the engine never(or rarely) fills itself completely, turbos tend to do things the other way around and packmore thent he static compression in because they force feed it compressed air. usually the lower static compression you have the more charged air you can fit in the cylinder and usually that means more power, but it also means waiting forever for power because until the turbo spools up, the engine has very low compression. make a good decision on your motors compression, the more static the more likely it'll have more lowend power.

4- injectors you need to choose on how much airflow you think you'll be getting, along with the size of the motor. i dunno how big it is or what you'll be choosing, but talk to a tuner. any dyno shop that offes tuning would be able to reccomend a few things if you tell them you'll bring the car there to be tuned.

goo luck with the project, be careful enough and you'll be fine, its a hell of alotta fun building it yourself too.