They say it cannot be done - 1000bhp Supercharged VXR8

[HappyMidget]

Because he obviously knows nothing!

[PH XKR]

You should give him some tips. Does he have a cai?

[HustleRussell]

MrBarry123 said:

Fair play OP for absorbing all the piss-taking.

Nah the OP flounced months ago didn't it?

[HappyMidget]

HustleRussell said:

MrBarry123 said:

Fair play OP for absorbing all the piss-taking.

Nah the OP flounced months ago didn't it?

Err, nope. Still here, just under a new name.

[anonymous-user]

HappyMidget said:

940 on 93 octane. 1000 on race gas at only 12 psi boost.

And with NO intake or exhaust system loses...........

And at a genuine 12psi, no way is that engine shifting enough air to make a real 1000bhp at those low revs, especially without any aftercooling either

[HappyMidget]

Depends how cold and how much water is in that big bin for the intercooler as to what his IAT2 temps is. The Whipple can come with up to 1.6:1 compression ratio in the rotors iirc. Add in a big enough cam and driving the blower at a higher speed it could well be pushing enough air. The 2.9 can flow enough air at 6500 engine rpm for circa 1200bhp from my vague remembrance of the calcs I did. But yeah, always worth taking Steve "Mental" Engineering with a pinch of salt.

With my build I will also be using an interchiller, which so far has seen IAT2's of -6C. That's is some nice cold dense air right there.

I am currently working on a statistical model to help me work out the right parameters for my end goal. Be interesting to see what my next mods make. See if I can get the model to predict a ballpark figure.

I also still need to sort out heat shielding the intake as well, but that may mean moving the washer bottle out of the way.

[PH XKR]

Stats mean st with a hole in your block!

[HappyMidget]

That is always a consideration

[HappyMidget]

Finally remembered to scan my dyno output of the comparison of before and after CAI and tune.

What is interesting is that you can see the difference the bimodal intake on the stock airbox makes at lower RPM (red line) versus the higher airflow of the CAI at higher rpm.

[SonicShadow]

EJH said:

Permission to split hairs...but is that 93 MON, as opposed to RON?

If it's from the US, it'll be AKI, which is the average of RON and MON.

[PH XKR]

Wow the cai makes a huge difference

[chuntington101]

Max_Torque said:

HappyMidget said:

940 on 93 octane. 1000 on race gas at only 12 psi boost.

And with NO intake or exhaust system loses...........

And at a genuine 12psi, no way is that engine shifting enough air to make a real 1000bhp at those low revs, especially without any aftercooling either

Max, care to expand on the reason this engine can't take make this power? The LS2 with decent heads, can, etc can eerily push over 500bhp. Stick some boost on top of it and why would it not make the number SEM state?

Also the whipple system does have after cooling. They actually run a pretty large air to water chargecooler. Can't R member the size off the top of my head.

[AER]

chuntington101 said:

Stick some boost on top of it and why would it not make the number SEM state?

...because 12psi isn't even double the intake pressure and boosting with a supercharger takes a shïtload of crankshaft power. There's only two reasons for starters...

[chuntington101]

AER said:

chuntington101 said:

Stick some boost on top of it and why would it not make the number SEM state?

...because 12psi isn't even double the intake pressure and boosting with a supercharger takes a shïtload of crankshaft power. There's only two reasons for starters...

Talking about psi as a judgement for bhp is a bit silly though! You have no idea what heads or comp. ratio that motor is making. It could be making 600bhp NA! Stick 12psi (or 0.8 bar) and that would take you upto around 1050 bhp. Take a 100bhp off (not sure about the maths on this) and you have your 940bhp. It really depends on how stout the engine under the supercharger is.

[TheAllSeeingPie]

HappyMidget said:

I also still need to sort out heat shielding the intake as well, but that may mean moving the washer bottle out of the way.

So supercharging an engine and all the pipe work that entails is fine, but moving a washer bottle is a faff?

[HappyMidget]

TheAllSeeingPie said:

HappyMidget said:

I also still need to sort out heat shielding the intake as well, but that may mean moving the washer bottle out of the way.

So supercharging an engine and all the pipe work that entails is fine, but moving a washer bottle is a faff?

Not really a faff, just another potential job on the list.

[AER]

chuntington101 said:

AER said:

chuntington101 said:

Stick some boost on top of it and why would it not make the number SEM state?

...because 12psi isn't even double the intake pressure and boosting with a supercharger takes a shïtload of crankshaft power. There's only two reasons for starters...

Talking about psi as a judgement for bhp is a bit silly though! You have no idea what heads or comp. ratio that motor is making. It could be making 600bhp NA! Stick 12psi (or 0.8 bar) and that would take you upto around 1050 bhp. Take a 100bhp off (not sure about the maths on this) and you have your 940bhp. It really depends on how stout the engine under the supercharger is.

Not silly at all. Your NA 600hp assumption at 6800rpm would need a VE of around 108%. That's one monster intake system for an NA V8, if indeed it is actually possible. As soon as you take it off and put a supercharger on top, you can kiss goodbye to most of that intake tuning.

[chuntington101]

AER said:

chuntington101 said:

AER said:

chuntington101 said:

Stick some boost on top of it and why would it not make the number SEM state?

...because 12psi isn't even double the intake pressure and boosting with a supercharger takes a shïtload of crankshaft power. There's only two reasons for starters...

Talking about psi as a judgement for bhp is a bit silly though! You have no idea what heads or comp. ratio that motor is making. It could be making 600bhp NA! Stick 12psi (or 0.8 bar) and that would take you upto around 1050 bhp. Take a 100bhp off (not sure about the maths on this) and you have your 940bhp. It really depends on how stout the engine under the supercharger is.

Not silly at all. Your NA 600hp assumption at 6800rpm would need a VE of around 108%. That's one monster intake system for an NA V8, if indeed it is actually possible. As soon as you take it off and put a supercharger on top, you can kiss goodbye to most of that intake tuning.

Good point! My maths is clearly off! So what would be a reasonable bhp figure for the engine?

[anonymous-user]

Factory s/c LS9s run 11psi, and make a genuine ~620bhp

1000bhp is roughly 60% greater output...........

[PH XKR]

So just add another 10psi, easy.... Peasy.... Lemon o'rly