Rx1 homemade blower kit 9 psi

[mulot30th]

Land and sea dyno SAE corrected (was 82defF and 83% humidity)


http://www.youtube.com/mulot30th#p/a/u/1/OuORYOVZeZk


215 SAE hp


pump gaz.... and can sustain..... LONG WOT as hell.


intercooler heat buildup showed a slight dip in torque as very end.



funny thing, this is apex engine in rx1 body, and I use the old style dobec/powderlites efi box... does pretty well considering it was never programmed to handle a positive displacement supercharger.

 

[powderlites]

Supercharger

Wow been a long time since we used manual load valve like that.
Good run and that is working that motor.

 

[Ski-Dooin' it]

that thing is SWEET... do you have any pictures of the motor setup on your buggy?? it sounds like you things QUITE dialed in.. also, any motor mods done or just the SC??

 

[mulot30th]

bone stock engine, head shim to run on pump gaz at sea level.


in fact it not so much dialed in.


past 8500 rpm its okay, but the powerdlites chips being made for a turbo setup, it have a hard time coping with boost at lower rpms....

it runs extremely rich in 5000 rpm range and extra lean in the 7500 rpm range.


this thing make full boost at wot a and 4000 rpm.


but only 9.5 psi or so. (pretty small blower)

 

[t_thall]

nice... What size blower? mp90?

 

[mulot30th]

opcon 2087


0.87l par revolution.

 

[dirk_03]

screw vs. centrifical

How does thwe screw charger compare to a centrifical one like MPI's? What are the down falls in comparing the two? Also what kinda of reliability does this screw charger have?

 

[mulot30th]

I have no issue to this time.


been riding this exact setup as is for two years now.... (mountain sled, not trail)



throttle response is rediculous.


a quick example would be if you lift a centrifugal blower sled on a stand and WOT it, it will take about a second or 2 to reach full rpm/full boost.


this sled, take about the same time as it take to get the throttle to the bar to reach full boost, so it full shift rpm on the stand.


http://www.youtube.com/mulot30th#p/u/8/zK9eUulcodA

 

[Ski-Dooin' it]

your gonna need to show me some pics of the setup installed in the sled.. I am seriously in LOVE after seeing the sled free reving in your youtube video's. Kinda makes me wannd build an SC setup...

 

[mulot30th]

Here a couple pics I have:

 

[mulot30th]

As you can see I pieced this together around a old boondocker's turbo intercooler.

Not the most efficient way (losing about 1.5-2# of boost doing that sharp turn.


but I did it with what I had on hand.


anyway, its extremely reliable and over 200hp... not too bad.

 

[SMOKNZ]

How is the blower driven?

 

[mulot30th]

Similar to MPI but using 6 rib pulleys and belts instead of cog belts (mpi)


Blower pulley direct to engine pulley, no need for the 'jackshaft/ 2nd set of pulleys like mpi in this case)

 

[Ski-Dooin' it]

what is hte valve hanging off of the bottom? looks like some sort of throttle body controled by the throtle cable?? just curious on what It does.

 

[mulot30th]

This is the manual Bypass valve I had to install, because I could not make a vacuum operated valve to work smoothly with throttle with this blower..

This way, boost is exactly proportionnal to throttle position anytime.