Supercharged Viper picture...

[Sean Roe]

Hi Everyone,

Just got back in this morning from my meetings at one of the companies involved in our supercharger project. Here's a picture of what we've all been working on (easy to install, low boost positive displacement supercharger kit). This is just the R&D setup and not the final finished kit. The car is getting ready to go to the other company for the engine management work. The installation is coming out very clean and easy. The picture is small on purpose as we don't want to show too much yet

You must be registered for see images

 

[BurnR8]

shhhhhhhhhhaaaaaaawwwwwwwwiiiinnnnnnnggggggggg!!!

 

[SteveBCloud9]

Sean, Keep us updated..... to the minute........

 

[Performin Norman]

 

[Sean Roe]

To answer an e-mail I got, this is not a mockup and in fact is the real deal. The fabricated intake and runners are mild steel for development and testing purposes only.

TNT, you're on the right track thinking of Kenne Bell, but he uses an SRM blower supplied by Whipple, which has a cast housing. The manufacturer's engineers were provided all the data on the Viper in order to properly spec the unit. This particular unit is the largest size they make (for automotive applications) and moves 2.6 liters of air per revolution. The boost will be set at 5 to 6 lbs. This unit will be set to spin at about 13,500 rpm at 5,700 crankshaft rpm, where a centrifugal unit would be spinning at about 40,000 rpm at that boost. The manufacturer said the unit can tolerate spikes of 16,000 rpm, but we won't see that on the Viper at this boost level.

Wait until you see it in person. I think I'll have to start carrying a box of bibs in the car so people don't drool on it

Sean

<FONT COLOR="#ff0000" SIZE="1" FACE="Verdana, Arial">This message has been edited by Sean Roe on 02-03-2002 at 04:21 PM</font>

 

[MtHam ACR]

Sean:

What kind of HP numbers do you think you'll make (I suppose the numbers above could tell me if I was an engineer . . .)?
What's your target application (street, strip, road course, full race)?
Any thoughts on heat-soaking and how you manage?

Thanks,
Eric

 

[Sean Roe]

Hi Eric,
The twin screw doesn't heat up the air as much as a centrifugal unit at the same boost, so we can safely run up to, and maybe a little more than, 7 lbs of boost without heating the air charge too much. More than that would need an intercooler to reduce the chance of detonation. Another reason why the positive displacement "twin screw" style appealed to me during research.
Regarding HP and torque gains, those numbers will not be released until the engine management tuning is done and we can state the actual #'s. We're working with another specialty company on that end and the tuning will be set in the "safe" power range. Suffice it to say that both a posistive displacement and centrifugal blower make virtually the same power at 6 lbs of boost on the same engine at the same rpm.
This system is Stage 1 and is for street / strip / autocross use.

 

[Miles B]

Sean..
beautiful - love it. There are lots of these sorta kits on other cars, I think it will be a huge success on the Viper. What price are you aiming at? Any clue at all what hp numbers your aimin at? Say, 550-650 area? I love mild DIY kits.. half the fun is doing it myself, but 900 requires too much stuff I can't do.

 

[MaxedGTS]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Sean Roe:
Hi Eric,
The twin screw doesn't heat up the air as much as a centrifugal unit at the same boost, so we can safely run up to, and maybe a little more than, 7 lbs of boost without heating the air charge too much. More than that would need an intercooler to reduce the chance of detonation. Another reason why the positive displacement "twin screw" style appealed to me during research.
Regarding HP and torque gains, those numbers will not be released until the engine management tuning is done and we can state the actual #'s. We're working with another specialty company on that end and the tuning will be set in the "safe" power range. Suffice it to say that both a posistive displacement and centrifugal blower make virtually the same power at 6 lbs of boost on the same engine at the same rpm.
This system is Stage 1 and is for street / strip / autocross use. <HR></BLOCKQUOTE>
Sean,
A centrifugal supercharger is about twice as efficient as a Roots type and about a third more efficient than the rotary screw. The centrifugal supercharger delivers more usable horsepower at the rear wheels and gives better gas mileage. (Not that I care about gas mileage.)

The system looks very good!

Max Moran

 

[FastMatt]

put me as #1 on your list

 

[garolittle]

Good Lord!

 

[Nadine UK GTS]

Can't wait for it...

 

[Sean Roe]

Glad you guys (and gals) like it

It's been a long time coming. It's been almost 2 years since I first started talking to Doug and Jason, getting their input on this.

Max,
Here's a graph of the power curve differences between a centrifugal and twin screw supercharger at low (5-6 psi) boost levels. Same engine and same boost pressure at 6,000 RPM. Both systems make about the same power at that point, but have different curves getting there. For the higher boost systems, the centrifugal would probably be the better choice. They each have different strengths. Nothing's wrong with either style. A 100+ RWHP increase is nice either way. For our goals and boost levels, we chose the positive displacement style.

Miles B,
Sub $7,000 range.

You must be registered for see images

Sean

 

[Gerald]

Is that graph from a VIPER engine? Only 300HP? Looks like it's from a small block or a V-6...

Gerald

 

[Sean Roe]

Hi Gerald,
Right on target. That's a graph I got from a company that sells both Paxton and Whipple superchargers and is from a 6 cylinder that both blower kits were tested on.

Sean

 

[onerareviper]

Freak'in awesome.

6 PSI boost throughout entire RPM range - WOW!!! Talk about a torque monster.....

 

[Miles B]

Sean,

You rock.

That's all I have to say about that. Will this upgrade need drive train work? Clutch/tranny/joints/diff/shafts ? Are these included in the price?

Once again, YOU ROCK. That is all.