Ideal CR

[blwnsmke]

Whats the Ideal Compression ratio for a turbo motor for high boost? Say 20 psi or so??

 

[blwnsmke]

With what turbo? What power goal?

Right now Im running a T3/T4 Hybrid.. As for power goal I don't really have a specific hp goal. Id like enough power to run low 12s or break into the 11's. Roughly how much power would that take?

 

[blwnsmke]

About 300-350whp, depending on traction, for a 2500lbs. chassis.

You'll probably want around 9:1 to 9.5:1 if it's a street car.

Yes its a street car. Daily driven at that.

 

[blwnsmke]

Im in the process of gather info on a new motor I am going to build. Its going to be a b18 block with a LS crank, Eagle H beams.. Not sure which pistons yet. I got a Built ITR head Im going to use also.

 

[Matts96HB]

Careful with that "built" ITR head. If it has all motor cams in it you will have some overlap. This is undesirable in any forced induction application.

 

[blwnsmke]

Careful with that "built" ITR head. If it has all motor cams in it you will have some overlap. This is undesirable in any forced induction application.

It has JDM GSR Cams.. What cams are you talking about exactly as in all motor?

 

[blwnsmke]

Any cam that has a high duration and a lot of valve over-lap. Turbo cam profiles usually have higher lift and a shorter duration for less over-lap. Valve over-lap means that you're blowing boost out of the exhaust ports.

So thats pretty much useless boost then?

 

[caboose]

So thats pretty much useless boost then?

Not useless, nessicarly.

It just means that both the exhaust and intake valves are open, so boost can travel right through into the exhaust until the exhaust valves close.

 

[amadeuscr]

With what turbo? What power goal?

you haven't centered the words yet

 

[99sidude]

It has JDM GSR Cams.. What cams are you talking about exactly as in all motor?

gsr cams are considered the best oem honda cam for boost. I've seen reports of people gaining 20whp just by tuning the cam angle of gsr cams on the dyno.