po feng

Can recommend 408ci Turbo compression use?
Head is used with tfs 235.
Pistons haven't purchased.
I want to determine the compression first, before buying a piston.
Or does anyone know the safe value range?

ddnspider

iTrader: (26)

Power goals and fuel used?

po feng

[QUOTE = ddnspider; 20212571]功率目標和燃料使用的/ QUOTE] 1200HP / 98fuel。

ddnspider

iTrader: (26)

Is that 98RON, i.e. 93 octane US?

po feng

是98 辛烷值。

ddnspider

iTrader: (26)

I'd go somewhere in the high 9:1 range, maybe 10:1.

973800CamaroRS

iTrader: (3)

I would never build a motor under 10-1 again

Dragframe

iTrader: (14)

I agree with these two. 🙃

po feng

[QUOTE = ddnspider; 20212602]我會去9：1的高範圍，也許是10：1。[/ QUOTE]

[QUOTE = 973800CamaroRS; 20212616]我再也不會在10-1以下製造電動機了[/ QUOTE ]Below 10:1,the effect is not good?

po feng

If I use 10.3:1, should the effect be ok?

HioSSilver

iTrader: (8)

12:1

Cylinder pressure makes power

po feng

[QUOTE = HioSSilver; 20212641] 12：1

氣缸壓力產生動力[/ QUOTE]


12:1 !!!
1200hp Turbo 98fuel use, determine?

squarles67

I'm going with 9.6:1 on my new 408 motor. Pump gas with 1000 hp goal. The higher compression could be made to work but it doesn't give you much room for error in the tune.

ETA: -15cc dish pistons and 70cc chamber

ddnspider

iTrader: (26)

Ignore him. He doesn't understand how to build a boosted car or keep a motor together. Keep it 10:1 or less with that power and fuel.

HioSSilver

iTrader: (8)

You ran .1 quicker with h/c boost vs my bolt on na ls6.....wtf do you understand about anything.

Cylinder pressure makes power. Boost increases cylinder pressure. Compression increases cylinder pressure. No reason you can't have both.

V8sounds

iTrader: (1)

I would argue you have a much better chance at 1200whp on pump gas at 10:1 than at 12:1. I don't think either one probably gets you there, but I think the 10:1 combo makes more than the 12:1 just by virtue of being able to add so much more boost at similar timing.

ddnspider

iTrader: (26)

Its hard for some to comprehend power and weight and octane limitations. If his NA motor doesn't run 9s he should light the car on fire.

HioSSilver

iTrader: (8)

Trying to get to 1200whp on pump gas isn't a very wise thing to try anyway.

All your junk should be on fire. Nothing you ever built was impressive even a little bit.

V8sounds

iTrader: (1)

I agree, just trying to get as close as possible with the info given

ddnspider

iTrader: (26)

There's no reason you can't if you spec the combo right. Let the boost do the work instead of the compression ratio. If you're able to, add a methanol injection kit for some margin. Hio just wants to matter so badly on here he comments on stuff he has no clue about. Ask if he's built a 12:1 turbocharged motor on pump gas. I block his comments and only see when someone quotes him because he's literally been laughed out of this section for spewing garbage. Even the SRK section is fed up with him. He shows no respect, so he gets none.