[QUOTE=WLAURENT,Dec 13 2007, 04:15 PM]

I believe the base kit will come with the 110mm pulley and no IC, the 126mm with IC will be offered as an option.

 

How many pounds of boost does that equate to and have you been back on a dyno yet ?

 

With the 110mm Pulley you could probably get away without an IC if you were living in the Northern states where the temps are generally lower than Arizona.

If you live in a hotter climate - then you would want to go with the 126mm/IC kit - or the 110mm kit and do your own Air-Air IC.

 

Since the Roots type SC is more an air mover than a compressor, the boost you see is dependent on the air density at the inlet of the SC - for example:

1800 ft. ASL @ 90-110F - my boost is around 6-7 PSI with the 126mm pulley

1800 ft. ASL @ 50-70F - my boost is around 8-9 PSI with the 126mm pulley

At 0 ft. ASL on the California coast in 50-70F temps - my boost was 10-11 PSI with the same pulley.

I am guessing the 135 pulley will put me right at the 10 pound mark for Arizona elevation and temps.

Plan to dyno again once the injectors are installed.

 

One thing you need to be mindful of.

With a supercharger PD, CT/VT blowers PSI does not always equate to a given power output.

The number you are actually looking for is the flow rates post blower/compressor once it is bolted on the Engine which can vary depending on the other modifications that have taken place (camshafts, ported manifold, high flow exhaust systems...ect)


It increased Mass flow rate of O2 we are trying to get ;
A higher pressure is just the most effective method to get that increase in density.

Here is an example of what I am talking about

Say you have a compressor that is only capable of putting out 8psi (or equivelent mass flow rate on a specific engine to = 8psi)under any condition.

If you have an engine that breaths better( cams, ported manifold, high flow exhaust..ect) it will have a lower manifold pressure but will have higher mass flow rate (AKA more HP/TQ) than a engine on the same compressor that had a higher manifold pressure.

As you can see here higher manifold pressure does not always mean more power. That

 

Yes, well I am very familiar with the roots style s/c on the RSX applications and am very familiar with the fact that boost pressure is not directly related to power. However, boost inside the head does relate to issues with the headgasket on these cars.

That is why I wanted to see what the dyno showed also. I am not trying to compare centrifugal to roots, just wanting to see how much power this thing is capable of and the torque and hp curve it will produce on this motor.

 

Once I get everything on I will post up my numbers for the AP2 version (126mm crank)

Based on how parts are coming in (not the blower or related components they are already here) the kit will be on early January.

Fuel injectors will not be here till next week I am traveling home the day after the injectors are scheduled to arrive so I will not have time to get everything installed and dyno the car properly.

 

WLAURENT - Have you decided what injectors you will go with? I was about to order RC 550's but I am curious to see what you will upgrade to first.

 

I am talking to a company that does custom flow OEM type injectors for FI applications. They got an S2000 manifold and fuel-rail and are working on an injector kit.

They told me they will be using Siemens DEKA injectors (525cc, 575cc and 625cc) - configured for drop in fitment (possible OBDII plug compatibility - but may require OBDI to II adapters) - with all 4 injectors flow balanced. Estimated price will be $300-$400 for the set.

Needing more fuel now - so I may need to get some RC's if they do not have something to try soon.

 

Did you upgrade your fuel pump I don