RNS-11Z

At what boost does the stage 2 and stage 3 blower run out of efficiency?
What are the standard boost pulleys provided? And who runs more boost then standard? Curious to know has any one used a different pulley to what's provided with the kit and run more boost.

H.

Merc63

Sure if your engine is built there are other pulleys.

Efficiency charts can be seen on whipples website I believe.

charliekay

Go Stage 3 with tranny first, if you want more power you can go built engine with 18psi. 9s is possible with that. If you want more power after that then talk to Weistec, but I'd say you are better off putting money in weight reduction, like CF roof, doors, bonnet, trunk, Strip out interior, CF seats, etc...

RawBenz

Stage 3 with Bulletproof Trans
As charliekay said, if you still want more after that, then go built motor.

RNS-11Z

I'm curious to know what boost levels you can run on the stage 2 and 3 before you exceed charger efficiency? What is the standard boost pulley provided? And if any one runs more boost then what's provided. Sure you can run more boost on a built engine but that's not my query. I'm curious to know if the stage 2 can handle 12psi and the stage 3 20psi. I'm just doing some calculations.

charliekay

I'm sure you can run a different pulley on stage 2 and stage 3. Weistec will have the answer but I'm sure the 2.3L runs out of steam after 8psi. Can't see why they would only run the Stage 2 at 8psi if it could run more, 12psi is standard Stage 3 boost.

I guess it comes down to what you are trying achieve?

charliekay

http://whipplesuperchargers.com/inde...iew&page_id=15

The Stage 2 is the W140AX, the Stage 3 is the W175AX.

Max. on each is 30psi, but a lot of variables contribute to that.

Southways

A 2300 Lysholm or Whipple will support most 7.0L (427ci) to about 13psi before the heat vs. boost causes diminishing returns, assuming a "street" build (cam duration <~250, LSA >112, high-flow intake, CAC, etc).

Merc63

Stage 3 is 12 psi with the 67mm pulley, less if you're not at sea level. I get 10psi.

There is a 60mm pulley for built engines and another 57mm I think, but they said anything smaller than 60mm produces too much heat.

The 60m is another 6 psi I believe and another 70-80rwhp I think.

You can run the 60mm on a stock engine with race gas and on a cold day if you're not worried about blowing it up. I have a 60mm here, too scared to use it.

mr747

I think I know what h us trying to say can you run a bigger pulley on a stage 2 2.3litre blower

Is there a way you can run a 10psi pulley on a stage 2?? Providing you have updated head bolts

roadtalontsi

These are questions i think only weistec can answer for you. Keep in mind the amount of boost is directly related to the tune, pulley and octane/fuel quality. Running more boost doesnt mean more power if you cant do it without detonation. They use the tuning of the camshafts advance and retard ability to bleed off extra compression/boost to prevent this when necessary. Also remember boost is a measurement of restriction, improve flow/efficiency and you can make more power with the same or less boost.

CGK

I understand what you are both trying to say but this has nothing to do with headbolts, Weistec has done all the R&D and no point reinventing the wheels here.

If you want power then the order goes like this.

1. Stage 1 S/C - 640hp
2. Stage 2 S/C - 670hp - If you want more power than this you need to do the tranny, regardless if you want to smaller pulley or bigger blower. The tranny will not last with Stage 2 power, let alone anymore.
3. Stage 3 S/C - 770hp - If you have done the tranny, you might as well pull the trigger and get the 3L blower. Upgrading the blower is simple. Alot cheaper than trying to get pulleys machined and seeing what works.
4. 3L blower with Built engine - ~850hp
5. 60mm pulley - ~930-950hp

Remember your restrictions on power are not just based on the pulley or boost, so many different components of the engine and the exhaust/air contribute to what the optimum boost vs power levels are. Weistec has obviously done alot of R&D in this field and it shows in the different pulley sizes between Stage 1 and Stage 2, even though it is the same blower, engine, etc... they understand and have perfected the perfect combination of air flow vs boost.

CGK

I just realised I have a different username. Wtf. lol.

mr747

AS the situation stands what if you had a built tranny all the exhaust mods but just wanted a 10psi pulley on a 2.3 litre blower is it possible?

and what needs to be done in order to run a 10psi pulley on a 2.3 litre blower

I have been told you need to run head bolts as the heads lift with a 10psi pulley on a m156 with a stage 2 supercharger

now what if you had head bolts is it possible and why cant you do it

these are the questions that the op wants answered

CGK

The OP doesn't have a blower, his car is N/A, so I am trying to give him suggestions on the best options for him at the moment.

If he wants to do his tranny, then put a 2.3L blower and see how much power he can get out of the 2.3L blower then he will need to do alot of R&D, and get different pulleys machined in multiple sizes, put them on and test them. Probably would need new belts made up as well.

My suggestion was just do the 3L because the cost difference between the 2.3L and 3L is $3k. I would guarantee you that you would spend at least 3-4 times that much getting pulleys and belts made up, plus tuning and dyno time to suit, to see if you can get even 1hp more out of the setup.

If you want those questions answered for yourself then that is a different story, but like I said before, the R&D is not just about pulley sizes, smaller pulley doesn't necessarily mean more power. If you don't get the variables right, it might mean less power.

RNS-11Z

Thanks brad that's part of my question. If a stage 2 user wants more power, why do you have to upgrade to the stage 3? Can you up the boost with out having to spend the extra $$$ for the bigger charger? Obviously the tune will need to be adjusted, this is common sense. But really, why can't you up the boost if the charger isn't out of efficiency.

Merc63 thank you for that info. It seems like 18-22psi is the maximum amount of boost for the stage 3 charger. If you could run 12/13psi on stage 2 then some may not be interested to go to the stage 3. I also assume you may need bigger injectors after 8psi too.

mr747

THe op does have a stage 2 blower siting around waiting to go in and his building his auto also

And its not 3k its actually 5500USD and for us in australia by the time it gets here is 10k
Hence why his asking these questions
If only we lived there

CGK

And my answer has not been why can't you, it has been why would you.

I know he has a blower sitting and is doing his tranny, and my answer to him is, if he wants more power go the Stage 3 and not regret it.

Why would you spend $10-15k doing R&D and not even know if you can get more power out of a Stage 2, or spend $10k max. and know you will get 100hp out of a proven piece of kit.

mr747

there is a grey area here

if you purchase a 2.3 litre Magnuson blower for a chev or ford or what ever car it comes with a 8psi pulley tehn after you upgrade bits and pcs you can up the boost to 13 or 14 psi why cant it be done to a whipple

RNS-11Z

It doesn't matter why! It may not make sense to you but to some people it does. Some people may not want to up grade to the stage 3 for extra. And if there is the capacity to run more boost, adjust the tune then why not if your seeking extra power. Why upgrade the hardware and be stuck with a stage 2 charger? What would you do with it then? Use it as ornament. All I'm seeing is if people want more power then 8psi they upgraded to stage 3, how ever I haven't seen any one query if you can actually run more boost on the stage 2.

CGK

If it makes sense to you then maybe you can be the first and let us know how you go.

CGK

Depending on the car, the exhaust, the fueling, the intake, the throttle body sizes, and a crap load of other things, it will effect the maximum boost you can run before you start to see losses, really don't know what is so difficult about this to understand.

Southways already said a 7.0L engine can go to 13psi with a whipple before they see diminishing returns, so a 6.3L would be less than that.

snakos

i ran a 10.4@132 mph with a stage 2 clk63 bs full weight which is heavier than a C63 its on you tube http://youtu.be/7gfhEzcAY64

snakos

[QUOTE=snakos;6555615]i ran a 10.4@132 mph with a stage 2 clk63 bs full weight which is heavier than a C63 its on you tube

mr747

What size pulleys do you have?? What was needed to run the extra boost in tune,inj,???