Desktop Dyno: Project Engine Results

[PROJECTRB240SX]

WELL I'M BORED SO I'M PLAING WITH MY DESKTOP DYNO AND WAS PLUGGING IN ALL MY INFORMATION FOR THE ENGINE I WANT TO BUILD AND EXPERIMENTING WITH TURBOCHARGERS AND HERE IS SOME OF THE RESULTS.

ENGINE PARAMETERS:BORE: 90MMSTROKE: 86MMC/R: 8.5 TO 1HEAD FLOW: 800CFM @ 1.5INHGCAMS: TOMEI PROCAM 270 SOLID LIFTERTIMING: -5 DEGREESINTERCOOLER EF: 30%TURBO: GARRET T-66 PSI: 30

BASELINE DYNO RESULTS:HP: 900 @ 8200RPMTQ: 876 @ 4300RPM

TOTAL COST OF ENGINE $5500

[PROJECTRB240SX]

THESE ARE JUST COMPUTERIZED ESTIMATES BUT IT HAS PROVEN TO BE PRETTY CLOSE, I PUT IN ALL THE PARAMETERS FOR THE RB20 AND ITS ABOUT 3HP OFF.

[JeffTN]

Thats pretty cool! There sure are several detailed parameters to play with. 8200 rpm, is that assuming stock valve train?

900/876 for $5500, that pretty darn good.

[PROJECTRB240SX]

NO THATS A FULLY BUILT RB20 HEAD WITH THE TOMEI SOLID LIFTER CONVERSION.

CAM SPECS:270 DEGREE DURATION10.5MM LIFT117.5 DEGREE CENTER LOBE INTAKE110 DEGREE CENTER LOBE EXHAUST-5 TIMINGTOTAL VALVETRAIN PARTS COST: $2800

[PROJECTRB240SX]

WELL THATS $5500 WITHOUT LABOR/MACHINING SO FIGURE IN ANOTHER $500-1500 PLUS YOU NEED A COMPUTER CONTROL SYSTEM.

[JeffTN]

Oh, ok so that TOMEI SOLID LIFTER "CONVERSION" must include all necessary valve train components.

Still not a bad price. I know its comparing apples to oranges, but I got $6k+ in my crx and I aint nowhere near 900hp.

[PROJECTRB240SX]

LOL.... DAMN HONDAS (KIDDING, ALL CARS ARE GREAT)

THE TOMEI CONVERSION IS CAMS, SPROKETS, SOLID LIFTERS, SPRINGS, AND GUIDES. THAT CAM COULD MAKE POWER UNTIL LIKE 12K RPM, WHICH IS WHY I WANT TO USE THEM.

[JeffTN]

She still gets 30+ mpg though. Enough about Honda.

That must include valve spring retainers too. What about valves? If that does not include valves, then what brand and material are you thinking of? Just let me know if I need to do my own research.

[PROJECTRB240SX]

YUP THATS WHY THEY ARE GOOD. I'M SURE THIS ENGINE WILL BE INHALING THE GAS.

[PROJECTRB240SX]

TOMEI HAS EVERYTHING. I'LL GET A PRICING BREAKDOWN FOR EVERYTHING. ONE MINUTE.

[PROJECTRB240SX]

HERE IS WHAT THE TOMEI STUFF IS:

CAM SET (BOTH CAMS AND ADJUSTABLE SPROCKET) $890SPRING SET (24 W/ RETAINERS) $380LIFTER SET (SOLID TYPE) $480VALVE GUIDE SET $480

THE VALVES I WAS GOING TO SEND OUT TO GET COPIED IN ANOTHER MATERIAL... WHEN I GET A FULL PRICE I'LL POST THOSE BUT FIGURE ABOUT $2800 TOTAL FOR THE PARTS.

[dareo]

What is your engine of power starting its life as, an RB20DET? That seems like a lot of boring/stroking to me. 900hp and all that internal work brings out my inner car geek

[spec-v5150]

AWESOME numbers man. Sometimes I miss my 240....then I think about the reliable car I dirve now.....so I am over it. But damn 5500 for a 900hp monster. Was their any bottom end work done on that........or does the computer not take into account that stufff.............

[PROJECTRB240SX]

This setup is with the rb20 head and work mated with a rb30e block.

Cost break down:Head Parts: $2800 + free headRb30 Block: $740Rb30 Internals(rods, pistons, rings, etc): $1200Rb26 oil and water pump: $260turbo: $500

But the thing is that the computer didn't account for fuel injectors and intake plenums and the sort. So there are some more costs added to it including machining/labor. So I think all said and done I could get by doing $7K-10K total in power work and have a complete, reliable, safe system.

[Mikel]

800CFM head flow?!?!

[PROJECTRB240SX]

Thats how much air is pushed throw the ports in the head. The rbs have considerably high head flow ratings and with and IR front facing intake plenum its even better.

[Yellow4g63]

Ok this is what I don't get. I have been buzing around the Skylines down under forum. A few people have noted that when u change the intake manifold setup on the RB20,25's the car runs leaner in #5 and #6. It was noted that the stock manifold was good for 400hp. Make any sense?

[PROJECTRB240SX]

YEAH, THAT IS BECAUSE THE WAY THE STOCK MANIFOLD IS DESIGNED.

THE STOCK MANIFOLD IS DESIGNED TO CENTER THE INLET IN THE MIDDLE OF THE MANIFOLD, THIS MAKES THE AIR TRAVEL DISTANCE EQUAL OVER THE WHOLE MANIFOLD.

ALOT OF AFTERMARKET MANIFOLDS ARE FRONT FACING SO THE FURTHER THE CYLINDER IS FROM THE FRONT OF THE ENGINE THE MORE AIR IS GOING TO REACH IT, THIS IS BECAUSE THE AIR IS GOING TO BE PUSHED TO THE BACK OF THE MANIFOLD AND GET CAUGHT ALLOWING MORE AIR TO ENTER THE LAST TWO CYLINDERS.

[Yellow4g63]

YEAH, THAT IS BECAUSE THE WAY THE STOCK MANIFOLD IS DESIGNED.

THE STOCK MANIFOLD IS DESIGNED TO CENTER THE INLET IN THE MIDDLE OF THE MANIFOLD, THIS MAKES THE AIR TRAVEL DISTANCE EQUAL OVER THE WHOLE MANIFOLD.

ALOT OF AFTERMARKET MANIFOLDS ARE FRONT FACING SO THE FURTHER THE CYLINDER IS FROM THE FRONT OF THE ENGINE THE MORE AIR IS GOING TO REACH IT, THIS IS BECAUSE THE AIR IS GOING TO BE PUSHED TO THE BACK OF THE MANIFOLD AND GET CAUGHT ALLOWING MORE AIR TO ENTER THE LAST TWO CYLINDERS.

What about the Unstable Hybrid intake manifold (RB20)? It replaces the upper half dose that one still not let enough air travle to the back?

[Mikel]

Thats how much air is pushed throw the ports in the head. The rbs have considerably high head flow ratings and with and IR front facing intake plenum its even better.

Yeah, I know that, but that's a rediculously high number. It's not at all realistic.

[hannibal]

Desktop Dyno?What program are you using and where can i get it??

Jay

[PROJECTRB240SX]

UMM, NO ITS MORE THAN REALISTIC, ITS ACTUALLY CONSERVATIVE. OK PUT IT THIS WAY, THE TRUCK WE HAVE IN THE SHOP RIGHT NOW IS PUSHING 1000CFM WITH JUST A CARB.

A MANIFOLDS DESIGN IS IN THE RUNNERS ALSO, THE UH DESIGN(REALLY TOP HAT PERFORMANCE DESIGN) JUST REPLACES THE UPPER PLENUM SO IT POSES SOME PROBLEMS, YOU REALLY NEED SORT OF LIKE A GREDDY (NOT ALL THAT GREAT), OR UNIQUE AUTO SPORTS COMPLETE MANIFOLDS, OR TO MAKE YOUR OWN IF YOU HAVE THE PAITENCE AND KNOW HOW.

I'M USING DESKTOP DYNO 2000 (SOON I'M GOING TO GET THIS REAL ONE, BUT ITS CLOSE TO $600), I PICKED MINE UP THROUGH EBAY BUT THEY SELL IT AT SUMMIT.

[Mikel]

Maybe I would have to see the program. Most programs ask for intake port flow and exhaust port flow. 800cfm is rediculous for either.

[McAdam]

800cfm for the whole intake side of the head? thats not ridiculious, thats just getting warmed up! its only 133 CFM per intake ports on a 6 cylinder.

McAdam

[Yellow4g63]

UMM, NO ITS MORE THAN REALISTIC, ITS ACTUALLY CONSERVATIVE. OK PUT IT THIS WAY, THE TRUCK WE HAVE IN THE SHOP RIGHT NOW IS PUSHING 1000CFM WITH JUST A CARB.

A MANIFOLDS DESIGN IS IN THE RUNNERS ALSO, THE UH DESIGN(REALLY TOP HAT PERFORMANCE DESIGN) JUST REPLACES THE UPPER PLENUM SO IT POSES SOME PROBLEMS, YOU REALLY NEED SORT OF LIKE A GREDDY (NOT ALL THAT GREAT), OR UNIQUE AUTO SPORTS COMPLETE MANIFOLDS, OR TO MAKE YOUR OWN IF YOU HAVE THE PAITENCE AND KNOW HOW.

I'M USING DESKTOP DYNO 2000 (SOON I'M GOING TO GET THIS REAL ONE, BUT ITS CLOSE TO $600), I PICKED MINE UP THROUGH EBAY BUT THEY SELL IT AT SUMMIT.

How do you make the Greddy unit fit the RB20? and whats the info on the Unique auto sports manifold?

[Mikel]

800cfm for the whole intake side of the head? thats not ridiculious, thats just getting warmed up! its only 133 CFM per intake ports on a 6 cylinder.

McAdam

Yeah, if you're averaging them together, it's rediculously low, alone, it's rediculously high.

Even a stock head should flow 200cfm peak, all day long, even on jewish holidays. So 200*6=1200. As an individual cylinder, no intake port flows 800cfm. Either way, it's not a realisitic number.

I'm pretty sure that DD wants individual port flow, in which case putting 800cfm as the value will make the power figures inflated beyond belief.

Not trying to be a **** or anything, just pointing that out.

[PROJECTRB240SX]

DD WANTS HEAD FLOW.... SO I WENT CONSERVATIVE AND PUT 800CFM. I KNOW WHAT I'M DOING WITH THIS PROGRAM, IF ANYONE HAS THE EXACT HEAD FLOW THEN I'LL CHANGE IT. BUT 800 IS CONSERVATIVE FOR THIS ENGINE.

THE GREDDY DOESN'T FIT ON THE RB20 I WAS JUST USING IT AS AN EXAMPLE. THE UNIQUE AUTO SPORTS ONE IS A GOOD LITTLE SYSTEM, http://WWW.UNIQUEAUTOSPORTS.COM , EMAIL THEM AND ASK FOR A FLOW CHART OR DYNO SHEET... I HAD ONE BUT DELETED IT.

P.S. BTW I'M USING THE STANDARD 66.66CFM PER PORT ON A DOHC EFI SYSTEM. THIS IS WHY I USED 800 IF ITS LESS OR MORE I'LL CHANGE IT.

[PROJECTRB240SX]

IT ASKS FOR THE ENTIRE INDUCTION FLOW! SO THAT IS THE ENTIRE HEAD INCLUDING PLENUMS. THIS IS WHY I TOOK THE CONSERVATIVE 66.66CFM.

[Yellow4g63]

After looking at there intake manifolds I'll just pay my friend to Fab one up that dosen't look so bad.

[Bluefire]

Have you guys seen this thread on skylines australia:

http://www.skylinesaustralia.c...ber=1

Very interesting read on the stock manifold and one fabbed up by a member... best part is he actually had them both flow tested..

-Bluefire