HIgh COmpression PIstons! power? probems?
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From: Hawaii
Originally posted by pimp1911
Hey. I will take 50. Lol. But on a serious note. Can we discuss ramifications of doing this. We can put these pistons in. But what about streetability. I would love to raise to 11.5. Hell. If I had a spare Z. It would have Nismo heads and these pistons. But there are factors such as pump gas vs race gas, how the ecu will act and low end performance
Hey. I will take 50. Lol. But on a serious note. Can we discuss ramifications of doing this. We can put these pistons in. But what about streetability. I would love to raise to 11.5. Hell. If I had a spare Z. It would have Nismo heads and these pistons. But there are factors such as pump gas vs race gas, how the ecu will act and low end performance
The problem is going to be the cams.
At 11:5 to one compression, you have to have a cam that the intake valves open pretty late, or you are going to have to run 100+ octane. I don't care how efficient the heads are you are not going that high with a stock ECU/cam/and pump gas.
That being said with a custom cam high duration, symetrical int/exh, and proper valve timing. You would probably see decent low end, and big mid/high end gains. I don't know how the ECU would handle it though. I don't know enough about the Variable Valve Timing system. That would be the big question to getting it to work on the street.
As far as streetability, who knows it's not like this is a big cube small block chevy that is going to crack out 420lbs of torque 3,000 rpm...(on the cam). Probably wouldn't be to much of a handfull as long as you keep the dynamic compression to around 8:1. Do it right and I be you could pull about 500hp at the wheels with a built long block and a huge NO2 hit
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From: belmont
yes you should get a stand alone ecu to fully tune the thing, you can do a 11:5 compression on pump 91 octane gas, my celica ran 91 daily driving and it had a compression of 11:5, ITS ALL IN TUNING the car
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From: Hawaii
Once you get it tuned it would probably be alot easier to live with on a day to day basis. But as above it's all tuning. A much fun as it would be. When I get my Z, if I build the block, I would go FI on a built block. 550+ rwhp with a built block would be ALOT of fun.
Originally posted by gq_626
But back to the question....just curious why you spend thousands of dollars to tare down the motor to install high compression pistons and gain...at most...50whp?
Wouldnt it make better sense to go F/I, and maybe throw in low compression pistons for safety and reliability? Just a thought.
But back to the question....just curious why you spend thousands of dollars to tare down the motor to install high compression pistons and gain...at most...50whp?
Wouldnt it make better sense to go F/I, and maybe throw in low compression pistons for safety and reliability? Just a thought.
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From: Irvine
AEBS with Nismo Heads, and TI valves and Spec 1 cams, AHHH perfectm and if you want get 9:1 pistons and surbo that ish!!!!! so you have crazy heads and valves and built block as well as Fi but you'll be paying lik 20 grand for that!!!! But it will be very worth it. YOu would have a 430 z like that new ferrari hahha! and you would have the same or more horsepower, probably 600 or so with relatively low boost ( around 11 psi) Probably msafer with that F/I plenum shown on that red g35. Thats the ultimate !!!! viper/ enzo killer. I think that with higher boost will sunn with twin turbo vipers/ corevettes/ porsche turbo. Its just that the Driveline can't take more than
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From: Atlanta
Originally posted by Zoomy_1
If you up the compression ration your are going to to see gains across the board as the actual cylinder pressure increases.
The problem is going to be the cams.
At 11:5 to one compression, you have to have a cam that the intake valves open pretty late, or you are going to have to run 100+ octane. I don't care how efficient the heads are you are not going that high with a stock ECU/cam/and pump gas.
That being said with a custom cam high duration, symetrical int/exh, and proper valve timing. You would probably see decent low end, and big mid/high end gains. I don't know how the ECU would handle it though. I don't know enough about the Variable Valve Timing system. That would be the big question to getting it to work on the street.
As far as streetability, who knows it's not like this is a big cube small block chevy that is going to crack out 420lbs of torque 3,000 rpm...(on the cam). Probably wouldn't be to much of a handfull as long as you keep the dynamic compression to around 8:1. Do it right and I be you could pull about 500hp at the wheels with a built long block and a huge NO2 hit
If you up the compression ration your are going to to see gains across the board as the actual cylinder pressure increases.
The problem is going to be the cams.
At 11:5 to one compression, you have to have a cam that the intake valves open pretty late, or you are going to have to run 100+ octane. I don't care how efficient the heads are you are not going that high with a stock ECU/cam/and pump gas.
That being said with a custom cam high duration, symetrical int/exh, and proper valve timing. You would probably see decent low end, and big mid/high end gains. I don't know how the ECU would handle it though. I don't know enough about the Variable Valve Timing system. That would be the big question to getting it to work on the street.
As far as streetability, who knows it's not like this is a big cube small block chevy that is going to crack out 420lbs of torque 3,000 rpm...(on the cam). Probably wouldn't be to much of a handfull as long as you keep the dynamic compression to around 8:1. Do it right and I be you could pull about 500hp at the wheels with a built long block and a huge NO2 hit
We do have access to Nismo Spec 1 and Spec 2 cams. But to my knowledge no one in the states except maybe the race guys have this type of cam in their Z's.
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From: Del Rio, Texas
There`s a car over here with the Esprit 11.5:1 CR kit on it. It`s making about 370 at the crank. That`s very nice, in fact, it`s more than a stock C5 with a lot less displacement.
Just thought I`d share.
Just thought I`d share.
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From: Del Rio, Texas
Originally posted by adanande
wow osaka japan nice oooh
are the pistons all he has? or deos he have cams and a ploished head?
wow osaka japan nice oooh
are the pistons all he has? or deos he have cams and a ploished head?
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From: Del Rio, Texas
Originally posted by axxizzer
TS ecu, cams, und pistons?
TS ecu, cams, und pistons?
So, yes, ECU, cams, pistons, and the other basic boltons will get you some power. But NA power does have a limit.
And now it`s real late over here. I`m out.
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From: IL, U.S.
Originally posted by axxizzer
hmm... what has he done to combat the detonation that others say will plague that set up?
hmm... what has he done to combat the detonation that others say will plague that set up?
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From: IL, U.S.
Do all Sunoco gas station sell 100 octane gas? Or only selected area? There is a Sunoco gas station in my town but haven't check them out. Not that it's worth to almost stock NA motor that I have, (and the price 
) but I wanna check it out.
) but I wanna check it out.
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