Corksil

Hey I am supercharging a b20v w/a compression ratio of 10.1:1

I currently have a 4" blower nose pulley which supposedly makes 7psi w/my b16 crank pulley.

My 4" nose pulley hits the brake MC in my CRX so upping the boost with a smaller nose pulley would save me a lot of headaches.

I have heard that the JRSC falls on it's face above 12psi -- the manifold gets too hot and the turbines don't push much air above 12psi.

Currently running water/meth 50:50 to help with cooling and detonation.

I don't want to change the crank pulley to a b20 anything other than my b16 because clearance is already TIGHT.

My options are 3.4", 3.2" 3" or 2.8" pulleys.

Am I being too greedy with 10psi of boost? And which pulley should I buy that will give me 10psi?

MRGRIM

iTrader: (1)

what pulley do you have on your ALT standard or stepper ?

Corksil

I have the two-belt pulley.

It has two pulleys of the same size, side by side.

MRGRIM

iTrader: (1)

ok so standard

your boost will be around 4-4.5 psi
going of the 4" blower + standard ALT + b16/sir crank =

if you follow this link you will see what configurations give what results

realy need more details on engine and blower setup to get an idea

Corksil

I talked to my tuner and he says 10psi is gonna be good for my setup. So that's what I'm shooting for, 10psi.

I think 10psi = 3.8" pulley w/b16 crank pulley.

b20z2 block untouched internals
b16 head
calculated comp ratio of 10.1:1
gsr intake cam (3* adv
itr exhaust cam (1* ret
aem cam gears


everything else is OEM spec.

b16 JRSC kit (m62 blower

2.5" 4/2/1 toda replica (PLM} header {2.5" collector}

custom 2.5>3" test pipe

thermal R&D 3" exhaust

no-name whale ***** intake

anything else you want to know?

rc 440 injectors

s300 hondata

walbro 255lph fuel pump..



thanks much for helping, and I will read your JRSC build thread when I have a minute.

MRGRIM

iTrader: (1)

very sorry i forgot to put the link in the last post

if you follow this link you will see what configurations give what results


http://ftlracing.com/jrsc_pulley.htm

realy need more details on engine and blower setup to get an idea

I CRX I

judging by the FTL calculator, you best bet using the b16 crank pulley is to get a alternator stepper pulley and a 3.6 nose pulley, that may yield you the PSI your looking for. can anybody have veris chime in to see if he can get us verification on the 3.6 pulley. anything smaller then a 3.6 is really pushing close to belt slippage which is why the lowest nose pulley setup on that list is a 3.8

MRGRIM

iTrader: (1)

the 3.6 + stepper will only yeald around 8.5 to 9 psi
but as said belt slippage will be an issue

can you explain more as to why you dont want to change the crank pulley ?
as going to the crv b20 crank will only be 1 inch in diameter larger
and should be of no concern re clearance at all

cruizinmax

iTrader: (2)

I wouldn't recommend going any smaller than the 3.8 on the blower pulley for sure. I setup a buddy of mines car with the 3.8 blower pulley/stock alternator pulley/b20 crank pulley and you would have to tighten the blower to alt belt like once a week due to slippage. Super annoying. I would recommend getting the largest blower pulley you can fit on your application get the stepper alt pulley and if that isn't enough boost consider a ls or crv crank pulley. The belts on these setups are so skinny they just wear out and slip super quick.

cruizinmax

iTrader: (2)

On a B20 it will be less boost.

Good luck, on my LS swapped EF there was hardly any room for the stock alternator pulley much less a double alt pulley. Those engine bays are TIGHT!

MRGRIM

iTrader: (1)

just for your info the charger belt runs behind the alt belt
between the alt belt and the alt housing
so there is no diffrence from stock re clearance to chassi

cruizinmax

iTrader: (2)

The superchargers I have installed have been on the EK chassis. If I remember correctly you have to rotate the alternator towards the firewall, farther back than the stock tensioner would normally allow. The EF chassis has 0 space back there. The frame rail has to be dented in to even get 50% of the factory adjustment.

Corksil

OP checking in.

Thanks to everyone who posted in this thread - your info and links are very helpful and I'm sure my answer is lurking in these posts/links.

Unfortunately been swamped with work lately, but once I have the time to review this stuff I'll post up my conclusion and link the JRSC B20v CRX build I am doing once I buy a new camera and post up some pics of the parts, the car, etc etc..

Thanks again guys, I love HT!

Corksil

Yes after reviewing this thread it looks like I have a few options to get 10psi.

Like you guys said - I don't want to go smaller than 3.8" nose pulley because of slippage.

----------9.1psi---------
b20 crank
standard alt
3.8" nose
-------------------------


--------9.5psi-----------
ls crank
stepper alt
3.8" nose
-------------------------


---------10.4psi---------
b20 crank
stepper alt
4.0" nose
-------------------------

The highest I am going to get with STANDARD alternator pulley is the first setup @ 9.1psi

My tuner recommends I stay around 9-10psi. I'm gonna buy the 3.8" pulley today so I can test fit this all together. I have heard that I'm going to have clearance issues with the MC and the nose pulley --- and that's with a normal sized MC and booster and I am currently running 1" oversized MC/booster.

Damnit I might need new motor mounts because the avid ones I have now might have the motor too far to the driver side...

thanks

Corksil

does anyone know where to get these alternator stepper pulleys? the endyn webpage is down and I'll call them up on monday.

MRGRIM

iTrader: (1)

ASPRacing makes NEW stepper pulley but you will have to redo your calculations as there stepper is 14% not 12% like the mvm / endyn

its not listed on the site you will have to call or email them
I got myn from there very nice product and going to get the rest remade there soon
http://autospecialties.com/

Corksil

I will call them first thing monday morning when business starts up again.

Thanks for your help dude.

Am I correct to assume - 14% instead of 12% would equate to slightly MORE boost? {or would it give me less boost?}

(also spoke w/larry @endyn today, he's gonna look around the shop for an endyn stepper on monday but that's beside the point.}

JRCivic1

The higher the boost level on a JRSC application, the more likely that you will have belt slippage. The common causes of this are reduced belt wrap around the blower pulley and improper belt tension.

That being said, the BEST place to increase your boost is a stepper pulley. This choice adds the boost you desire without increasing the accessory speeds and parasitic drag. In addition, you add belt wrap to reduce the possibility of belt slip... and this is a "win win" situation. The next best choice is increasing the size of the crank pulley. The last choice should be the blower pulley itself... primarily because you are reducing belt wrap around the pulley when you need it the most.

To reach the boost level you desire, I suggest you use the 4.0" blower pulley you have, add a GSR crank pulley and an alternator stepper pulley. ALL EF chassis require clearancing of the frame rail for the alternator pulley. You mentioned some interference with the brake master cylinder... my suggestion there is to install a few washers between the firewall and the booster itself (the lower two studs only) to angle the front of the master cylinder up and away from the blower nose pulley. You may have to try a few different combinations of washers to find the perfect balance - just enough angle to provide the clearance needed without too much angle.

MRGRIM

iTrader: (1)

the man has a point
belt wrap is important
thats why i have no slipage at 14.5 psi

BUT HEAT is your next big problem to solve....

wantboost

iTrader: (2)

Yea at 10 psi intake temps will be sky high and you'll make no power

Corksil

I am doing water/meth for cooling. If that isn't enough I will have the LHT intercooler mods done but that's beside the point of this thread.

Right now I'm looking at this as my optimal setup..

----------9.5psi-------------
LS crank pulley
alt stepper pulley
3.8" blower nose pulley
-----------------------------

OR I COULD DO THIS

-------9.1psi-----------------
CRV crank pulley
STANDARD alt pulley
3.8" blower nose pulley
------------------------------

Can anyone confirm --- will the ASP alt stepper pulley give me MORE boost? Grim said it was 14% instead of 12% (like the MVM stepper pulley) but I'm not exactly sure what that means. 14% bigger?

This is all very good information thanks guys.

I'm bidding on a 3.8" nose pulley on ebay but the ******* keeps trying to outbid me because he doesn't know that MY BUDGET FOR THAT TINY ROUND PIECE OF METAL IS OVER 9000 SO STOP TRYING TO OUTBID ME YOU *****, YOU ARE ONLY MAKING THIS HARD ON YOURSELF!

Yes I am very worried about nose pulley hitting my MC. Currently running a 1" MC/booster from a honda odyssey van. The hardlines are on the PASSENGER side of the MC, unlike the 1" integra MC that people usually run. (the integra 1" MC has the lines on the DRIVER side unlike my odyssey MC.)

It looks like I need to replace my MC with an integra 1" MC and make two new custom hardlines to get from MC to my 4040 prop under the dashboard.

Shimming the booster sounds like a good idea.

A contact of mine ran the same b20v setup in an EF with the same 1" integra blower/MC and the same 3.8" nose pulley and he still had clearance issues with the MC. He fixed them by grinding a chunk out the side of the MC..

I won't go any smaller than 3.8" nose pulley because of belt slippage, but currently I have a 4.2 and even a 4.0 is going to have big clearance problems. 3.8" is the sweet spot i think.

MRGRIM

iTrader: (1)

I would go with the LS + ASP + 3.8
then your not over running your ALT PS AC

oops ok Ill explain the 14%
the ALT standard JRSC pulley both are the same size

on the MVM and ENDYN the supercharger belt side of the ALT pulley
is 12% bigger than the stock JRSC pulley

on the ASP the supercharger belt side of the ALT pulley
is 14% bigger than the stock JRSC pulley

so if you use the FLT calc you input 14 inplace of the 12 for the ALT
stepper pulley and you willl see the boost diffrence

EG:- for 1973cc @ 8000 rpm @ 100' Altitude
LS + MVM 12% + 3.8 = 9.5
LS + ASP 14% + 3.8 = 9.7

hope that helps

OH and I recommended the ASP due to the ENDYN and MVM are almost impossible to find
the ASP is made new also in the anodise color you want and it has lips so the belt dont jump off

Corksil

Yes I understand everything you said very clearly.

I've located an MVM pulley that will fit a mitsuba alt, but I think I have a nippon denso because it came out of a 94 usdm del sol VTAK. It's used and the fellow wants ~100 bucks for it.

I spoke w/Endyn and Larry is going to hve a look around his shop when he goes in on monday. There's a possibility he might hve one he could send out but it's 50/50..

None on ebay..

So ASP sounds like the winner here. I'll phone them up tomorrow first thing in the morning. How much did you pay and what did you tell them? JRSC b-series honda alternator stepper pulley.. 14% step increase from original..? Hopefully they know what I'm talking about.

And yes I understood the 12/14% thing you said, I just wanted to be clear that 14% would give me a tiny bit MORE boost which is perfect.

Yeah I'm pretty set on

LS crank pulley
ASP alt stepper pulley
3.8" nose pulley

That would put me right under 10psi.

Thanks for the help I think i've figured out my pulley configuration now it's on to things like methanol injection and figuring out how to tune all this with s300

wantboost

iTrader: (2)

The cheaper option might be buying the mitsuba alternator lol

Corksil

Buy the mitsuba and run the 100 dollar mvm stepper?

the slight boost increase from the autospecialties pulley is much welcomed and we'll know how much the pulleys cost tomorrow when i make a phone call.

i'll post it here.

i'm in the process of uploading parts pics and pics of my bucket that this whole science project is going into.

i'm making a build thread for this project, hopefully it will be up tonight and i'll link it here and you guys can follow the progress and we can discuss this stuff in the thread instead of my 15 scattered random threads on HT about the topic of supercharging a b20v.