CoffeeCommando

Great news. After talking to RR I decided to put the recirc back at the TB so that it could let off the decelleration boost (what little there was only at WoT). There was no change in the boost.

Then I decided to put it back where Sprintex designed it to be. When I did that, if I gave it a small punch at cruising, when the RPM's shot up the boost actually correlated. I get 1 - 1.5 PSI boost when I give it immediate throttle while cruising and it holds, or tapers down to, 1 PSI thereafter until I ease off the throttle.

Just for the hell of it when I parked it at the house I floored it. It jumped up to 4.7 PSI. Looks like leaving it exactly where it's designed to be is better than any other location, just the intake needed to be upgraded to match. Considering that's the boost of a fully heated up engine, a 15.51% increase would translate to 5.4 PSI. I will be happy with this future number.

I still have the supercharger whine while driving regardless of boost.

Full throttle boost numbers are still the same.

RR said it would be $100 for a pulley. He's looking at the pictures I took to determine which model of pulley fits my application ATM.

CobraMarty

Hey, What's the latest?

CoffeeCommando

R&R had rotator cuff surgery mid last month and I became busy helping my dad with some house project so I have forgotten about it.

I'll call back today. Email has been unresponsive.

CobraMarty

While you are waiting for the smaller pulley, Otherwise, how is it doing? Daily driving it? miles? performance as it is? max boost as is? Just give us followers an update as to how it is doing and your findings over the last month.

CoffeeCommando

When I immediately WoT I get about 3lbs but it soon drops to around 2.5 and holds there until it reaches over 4500'ish and shifts. Then if it's still at WoT it holds around 1.75~ until the next shift.

That being said your 2.57 prediction is spot on with what it consistently holds in WoT before the first downshift. I can only hope that 5.75 will be accurate as well.

Where did you get the math for these numbers?

It still drives as before as far as gas mileage, but it certainly accomplishes more acceleration with less effort regardless of boost or no boost.

I have and have had since the first time I relocated the BPV to the TB location, a CEL on deceleration. I owed it up to the fact that I switched the BPV location and it had already learned the engine operation and I had thrown a giant variable change into the vacuum portion of the equation; but after resetting the computer with the new location it persists.

It's a cylinder 3 and 4 misfire, and it blinks on and off whenever I reach over 50mph and let off the pedal completely. If I drive for a while doing 40-45 only or less the CEL goes away, but if I get over 50'ish and let off the pedal completely it comes back. It's completely unnoticeable as far as engine operation.

I even reset the comp. and put it back in the original location once and it still persisted.

CobraMarty

Wierd at 50mph, Did you correct your speedo for the bigger tires? Check your speedo reading to actual gps. Get a gear for the SLE speedo drive to correct the reading if it is off.

'Formula' is just math and 40+ years of my experience, reading, figuring. I have been checking everyone's hp claims for years and comparing.

Your CEL on decel doesn't make sense. Always the same CEL code?
Misfires, check your plugs. Regap to 0.032"-0.035" to start.

I forget all your vacuum line routing. Any airleaks?

CoffeeCommando

I'm sure there isn't but I'll check again. If there was it wouldn't idle correctly and I would notice the oddity elsewhere (IE not the codes), and there would be a code for vacuum leaking. I forget what it is but I've seen a trifecta of them a few times.

Speedo is working just fine as it is. If it ain't broke I ain't fixing it! Unless there's an aftermarket hi-torque replacement for it. That's always been my motto.

I'm pretty OCD about comparing numbers and differences in things myself. I'm very scientific. I've even been called methodical and Krieger.

CobraMarty

There is no code for vacuum leak specifically.
The ecu and trans both need correct/accurate speedo reading when it compares values for in/out of range and CEL codes.

In a perfect world, doubling the ATM will double the power. So 14.7 +14.7 = 2x the power. Due to mechanical loss and inefficiencies I use 16 as the amount of increase in ATM to double the power. This has proven very accurate over the years. That is why 8 pounds of boost adds 8/16= 50% more power.

Another for the superchargers is the pressure ratio. Air being forced in / amount of air the engine would normally consume. Look at my example-
58mm = 2.28" 6.375" = 2.79:1 x2 x59CID = 329CID /280CID stroker x14.7 = 2.57 pounds boost

58mm S/C pulley = 2.28", 6.375(crank pulley)/2.28(SC pulley)=2.79:1 step up ratio(SC turns 2.79 times for every 1 crank rotation)
2.79 x2(#crank revolutuions/engine cycle) x 59CID(displacement of SC/rev) = 329CID
329CID(output of SC) / 280CID 'input'of stroker motor = 1.175 Pressure Ratio
1.175 - 1.0 = 0.175 additional pressure/ATM going into the engine
0.175 x 14.7(atm) = 2.57 is the amount of boost into the engine.
2.5 pounds actual vs 2.57 pounds calculated is close enough and within the resolution of the measuring devices
2.57 / 16 = 16% more power

You can also work the equation backwards to determine for a give /desired boost- supercharger size, SC pulley size or crank pulley size

CoffeeCommando

Rick's going to give you a call soon about the 49mm pulley. he's afraid I'm going to overspin the blower. He's been so busy and it's been so long since I sent him the email I think he's completely forgotten about the numerical values I emailed him on the actual RPM's, and the fact that it's a continues rating (mine will only see brief spikes with the AW4)

Binnader

[QUO TE= CobraMarty;2995988]Theoretical/Predicted Boost-
The Sprintex 210 SC is on the 'small' size but works well.

Stock 4.0- 6.375" crank pulley / 2.5" SC pulley = 2.55 x 2(revs/engine cycle) = 5.1 x .94L = 4.794L / 3.956L(stock 4.0) = 1.212 pressure ratio -1 x 14.7(1ATM) = 3.11 pounds + inefficiency of flow of engine(fudge factor) add about +2pounds = 5 pounds boost actual seen

4.6L: 6.375"/2.5" x 2 x 0.94L = 4.794L / 4.6L = 1.042PR -1 x 14.7 = 0.62 pounds + inefficiency (fudge factor)+2 pounds = 0.62-2.6 pounds of boost actual seen

4.6L: 6.375"/2.25" x 2 x 0.94L = 5.33L / 4.6L = 1.158PR -1 x 14.7 = 2.32 pounds + inefficiency (fudge factor)+2 pounds = 2.32-4.32 pounds of boost actual seen

4.6L: 6.375"/2.00" x 2 x 0.94L = 5.99L / 4.6L = 1.303PR -1 x 14.7 = 4.45 pounds + inefficiency (fudge factor)+2 pounds = 4.45-6.45 pounds of boost actual seen

We run a 47mm(1.85") SC pulley.

So what size pulley do you order?
Try 'Pulley Boys' in FL, might need to send them your pulley to measure.[/QUOTE]

can you put as a link For the pulley sizes that we can purchase From pulley boys I have the same superstars and I have a problem please help me

CobraMarty

What supercharger kit do you have? What engine? Mods?
What size S/C pulley do you currently have?
What problem do you have?

Binnader

Good day CobraMarty





Sprintex SuperCharger kit for the XJ





my XJ is 1997





and S/C pulley size is the one that came whet the Sprintex SuperCharger kit








the XJ Engine is





JEEP 4.6L or 4.7L STAGE 3 STROKER KIT/ with all upgrades -


Scat 9000 series crankshaft


Scat I-beam Forged Rods w/. 8740 Rod bolts


Clevite rod


Clevite Main Bearings


Hasting Moly Rings


IC944 ICON Forged Pistons .030


1,354.00 1,354.00T


6- Fuel Injectors (24LB)











AndCOMP Cams





Basic Operating RPM Range:1,000-5,200





Intake Duration at 050 inch Lift:210





Exhaust Duration at 050 inch Lift:218





Duration at 050 inch Lift:210 int./218 exh.





Advertised Intake Duration:254





Advertised Exhaust Duration:262





Advertised Duration:254 int./262 exh.





Intake Valve Lift with Factory Rocker Arm Ratio:0.477 in.





Exhaust Valve Lift with Factory Rocker Arm Ratio:0.493 in.





Valve Lift with Factory Rocker Arm Ratio:0.477 int./0.493 exh.





Lobe Separation (degrees):111








And Rocker Arms





Harland Sharp Original Roller Rockers





Rocker Arm Ratio:1.6





Rocker Arm Style:Full roller





Stud Size:5/16 in.











And aJeep 4.0L Stage 3 Ported Head w/ Oversized Valves





Valve seats are opened up to accommodate large intake (2.0 in.) and exhaust valves (1.551 in.).








And Painless Performance PERFECT Hi-Velocity Throttle Bodies


Venturi Diameter (mm): 68.00mm








This is the problem

Binnader

CobraMarty

Is that just for your 4.6L stroker and NO supercharger?
What is the difference between the different runs? Anything?

YOU- 159,171,186,191 HP / 223/231/252/253 TQ
These numbers are right in line with what I have seem from others. See-
http://jeepm62superchargerkit.blogsp...g-page_15.html

156rwhp/266rwtq corrected*(173rwhp/295rwtq Dynojet) 4.7L Stroker '98 XJ
185rwhp/241rwtq 4.6L Stroker 9.56:1 0.043"quench stock head +5-6*timing mod 63mmTB 24lb injectors Hesco474/480 cam ?dyno correction 204rwhp/265rwtq
193rwhp/236rwtq ?dyno, 'Gradon's Stroker' from old post, 4.6L, 30cam, ported head
202rwhp/258rwtq Dastek dyno, 'Cheromaniac's' '92 4.6L 'poor man's Stroker' '01 intake 65mmTB 9.25:1 ported head 5sp header

Binnader

Good day CobraMarty



I need at least 700HP and 700 TQ for a Sand Dune Hill Climb if you can help me I want to participate in this contest in my xj i need you as my mentor


For this Project I know I need a lot of things to buy


This is what i will encounter in the competition see the link