FireF4ly

I recently had a massive engine failure and now have sent the block to Laskey Racing to be resleaved and all those other goodies that he does. I plan on turbocharging the engine in the near future. Knowing this, Mike has told me if I plan on turbocharging I might as well do it right and go with the 9:1 CR pistons instead of using the 3mm hg. This is fine, but the problem is that I am/was using this car as a daily driver and would like to be able to "cruise" around in the S2000 for the next couple of months until I can afford the inline pro turbo kit. (Probably 3-4 months until i can afford it)

My question for you guys is how much power loss can I expect if I go with 9:1 CR pistons before it is turboed? Will the car be even driveable, or is it a turbo or no run kind of thing when moving to 9:1 CR Pistons?

Another choice I have seen is that people raise compression for a NA car. Does anyone reccomend maybe i do this instead, and will be reliable?

Please give me some advice here, and try to stay away from the "what happend/How did it break" burns and questions because it is a long story resulting in me having to get my current motor built, or getting honda to replace/repair the motor for $7-8k.

bigpurp

At 9:1, w/out boost, the car will feel like a pig.

That being said, 3-4 mos is not a long time, so u won't have to suffer too long.

AusS2000

It will be fine. It wil lose it's edge but not so much it would be trouble to drive.

Dsgs2k3

look for a 35-40hp loss

FireF4ly

Thanks guys. How do you know there will 30-40hp loss? Are the mathmatics that complicated or are you just going from experience? Also, is the 30-40 at the flywheel or tires?

NFRTurboTerror

If the end result you want is MUCH greater performance then turbo it well WORTH THE WAIT. You MIGHT pick up 15-20whp going 12-13:1cr properly tuned. Or you could loose 20whp for now put the turbo on and gain back 200+whp. Just my .02

NFRTurboTerror

The mathmatics arent very complicated, but just from experince i would say closer to 20-30whp than 30-40. You may already know this; You can think of your engine as a bullet or a bomb. You can light gun powder on fire and it flames up and goes out. Put it under pressure and it explodes. Same with your engine. The more you compress the fuel and air the larger the explosion. Well if you put in the same air and fuel but compress it less the smaller the explosion and the less torque the engine will produce. As we all know HP is just derived from the usable amount of torque that the engine makes. TQ X RPM / 5252= HP(the opposite is HP X 5252 / RPM=TQ. So if you currently make 140tq @ 9000=240hp. If you you only lost 10ft lbs of torque @ 9000(which you wont just lose it @9000, you will lose it through the whole rev range) you would only have 220hp.

ChefJ

I had a money shift right before the turbo install was supposed to take place and while it was at the dealership being repaired I had them put my 3mm hg on. Idrove th car for over a month on the stock ecu settings with lower CR. The car will feel pretty close to stock until you hit vtec and thats when you will be missing that extra compression. I know this first hand. But for daily driving I would assume that you don't need the vtec cam anyway.
Before I did this I was told that it wouldn't run, that it wouldn't start, that it would go into limp mode, and all kinds of other bs from people with no experience. Well I have been there done that and it doesn't affect anything but the hp up top.

NFRTurboTerror

[QUOTE=ChefJ,Jun 30 2007, 10:00 AM] I had a money shift right before the turbo install was supposed to take place and while it was at the dealership being repaired I had them put my 3mm hg on.

Spec_Ops2087

Mine makes ~20hp less then I was stock from 2-~4k rpms, once 4k hits my turbo spools and by 4.5k rpms I'm making more power there then I was at redline stock


Its worth it!