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View Full Version : GT25R dyno post .64A/R this time



Movingviolation
03-08-2004, 09:19 PM
http://www.nissaninfiniticlub.net/photopost/data/500/4357-med.JPG

.64 AR housing, intake manifold, 264 step 1 cams, 555cc injectors, stock turbo manifold.

And it's still for sale,

Paul
Orlando, FL

DRAG_LIMITED
03-08-2004, 09:30 PM
nice

Turbob15sentra
03-08-2004, 10:30 PM
How many pounds of boost? What's the duty cycle looking like on the injectors at that level?
Travis

Movingviolation
03-08-2004, 10:38 PM
555's are about at their max safe level there (Scott says their good to 360rwhp). Boost was set at 1.3 bar.

Paul
Orlando, FL

vosko
03-08-2004, 10:58 PM
not bad.......i might have mine on the dyno this coming sunday...

Trunk
03-09-2004, 12:13 AM
You went with the larger one, right Vosko?

rednerd
03-09-2004, 01:09 AM
Boost was set at 1.3 bar.



Wow, 19.11 PSI! That is one awesome torque curve.


I'm guessing you have a metal head gasket?
Who makes your intake manifold, greddy?

Society_Mike
03-09-2004, 03:28 AM
555's are about at their max safe level there (Scott says their good to 360rwhp). Boost was set at 1.3 bar.

Paul
Orlando, FL


I don't know why people are saying this. 550's are known to be safe over 400hp with good tuning here. Even with stock FPR and GTR fuel pump, but I do know many people who change the FPR.

Beau
03-09-2004, 06:59 AM
How responsive is this turbo with the small A/R? I'm not familiar with anything other than the stock T25, so just try to give me the best idea possible of what I could expect.

Enthalpy
03-09-2004, 07:34 AM
Mike,

the difference is wheel HP vs estimated Flywheel HP. alot of the dynos that i have seen come out of japan are estimated Flywheel HP. the Bosch Dyno that is common over there does a coast down test that attempts to measure driveline loss. then it adds this value back into the final results.

Trust me, i tried running 400 whp on 555's. it cost me a motor. #1 went so lean it melted the spark plug. there were detonation marks everywhwere when i pulled her apart. when you are making max power at 7300+ rpm the avaialble on time gets very small and duty cycle goes up. for safety of the engine i usually reccomend only 360 on 555's that leaves them at a duty of around 85-90%.

Movingviolation
03-09-2004, 07:52 AM
How responsive is this turbo with the small A/R? I'm not familiar with anything other than the stock T25, so just try to give me the best idea possible of what I could expect.



A little bit more lag than an S15 turbo (at least that's how Scott said it looked on the graph). I really havn't driven a lot of 'big small frame' turbo cars to know what to compair it to. I know it blew away my freind's old "FP Big 28".

Paul

Beau
03-09-2004, 08:19 AM
How responsive is this turbo with the small A/R? I'm not familiar with anything other than the stock T25, so just try to give me the best idea possible of what I could expect.




A little bit more lag than an S15 turbo (at least that's how Scott said it looked on the graph). I really havn't driven a lot of 'big small frame' turbo cars to know what to compair it to. I know it blew away my freind's old "FP Big 28".

Paul


Good, that doesn't sound bad at all. This turbo's sweet spot is between 17-19psi like it's big A/R counterpart right?

shark_tank
03-09-2004, 09:11 AM
paul, show me the link where your car is for sale

Hugh
03-09-2004, 09:20 AM
Mike,

the difference is wheel HP vs estimated Flywheel HP. alot of the dynos that i have seen come out of japan are estimated Flywheel HP. the Bosch Dyno that is common over there does a coast down test that attempts to measure driveline loss. then it adds this value back into the final results.

Trust me, i tried running 400 whp on 555's. it cost me a motor. #1 went so lean it melted the spark plug. there were detonation marks everywhwere when i pulled her apart. when you are making max power at 7300+ rpm the avaialble on time gets very small and duty cycle goes up. for safety of the engine i usually reccomend only 360 on 555's that leaves them at a duty of around 85-90%.



You could also factor in the lower octane fuel run in the states to account for some of the duty cycle as well. More fuel must be run to achieve the same results. Therefore, less ceiling to work with.

I know that my car wouldn't make 400rwhp without water injection on 550's. I was peaking the injectors at 100% and spraying 270cc's of bottled water past .7kg to keep the exhaust temps down.

We also ran out of injector on Brett's 180sx (the one with the S14 motor from my site) He had 550's, and at less than 370rwhp, it became apparent that he was going to need bigger injectors. We eventually swapped his out to 850's as well.

s13SRmadness
03-09-2004, 10:13 AM
say you had the same turbo, motor, and cams, but added a ss manifold, greddy intake manifold, and jacked the boost to 21-22 lbs...
anyone care to venture a guess on whp???

Enthalpy
03-09-2004, 10:59 AM
The car has a greddy intake manifold. S.S. Manifold would probably be a 15-20 hp gain.

s13SRmadness
03-09-2004, 03:46 PM
so that and a little more boost... maybe 375 whp?

vosko
03-09-2004, 05:31 PM
You went with the larger one, right Vosko?



i have the .86

vosko
03-09-2004, 05:40 PM
Wow, 19.11 PSI! That is one awesome torque curve.




NO!

1.3KG/CM^2 X 14.2PSI = 18.46 PSI

my high boost will also be 1.3KG... http://forums.freshalloy.com/images/graemlins/smile.gif

Brad
03-09-2004, 07:14 PM
errr well my chemistry and physics book rates 1 kg/cm^3 as 14.7, which would make it 19.11 psi....but whos counting http://forums.freshalloy.com/images/graemlins/grin.gif

ive seen it both 14.3 and 14.7, which does make a pretty substantial difference, i sure wish there would be a standard.

im surprised the .64 a/r makes that kind of power...makes me want to ditch the .86 in favor of that

Movingviolation
03-09-2004, 08:00 PM
paul, show me the link where your car is for sale



http://www.nissaninfiniticlub.com/forums/showthread.php?s=&postid=547072#post547072

That's on NICO, it's also listed on FA but I can't find that link right now because I'm lazy heh.

Paul

BlackBomber
03-09-2004, 08:06 PM
Paul, what would possess you to sell such a beautiful car?

bl200sx
03-09-2004, 08:22 PM
WOW!! great looking car man!!

asad
03-09-2004, 08:25 PM
errr well my chemistry and physics book rates 1 kg/cm^3 as 14.7, which would make it 19.11 psi....but whos counting http://forums.freshalloy.com/images/graemlins/grin.gif




Onlineconversion agrees with vosko -- 1 kg/cm^3 = 14.22 psi -- so 1.3 kg/cm^3 = 18.49 psi.

Asad

HugeCanSpec
03-09-2004, 08:35 PM
errr well my chemistry and physics book rates 1 kg/cm^3 as 14.7, which would make it 19.11 psi....but whos counting http://forums.freshalloy.com/images/graemlins/grin.gif




Onlineconversion agrees with vosko -- 1 kg/cm^3 = 14.22 psi -- so 1.3 kg/cm^3 = 18.49 psi.

Asad



I was under the impression 14.7psi = one atmosphere, where the BAR unit, which is supposedly 1 atmosphere, differs slightly for some reason. Maybe having to do with some sort of standardization ? This is merely what I have been told.

asad
03-09-2004, 10:13 PM
I was under the impression 14.7psi = one atmosphere



14.7 IS one atmosphere.




where the BAR unit, which is supposedly 1 atmosphere, differs slightly for some reason.



It differs because it's not one atmosphere http://forums.freshalloy.com/images/graemlins/smile.gif

And 1 kg/cm^3 is slightly different as well from both bar and atm. It would be very surprising indeed if a combination of rather disparate units (kilograms and centimeters) just HAPPENED to be exactly standard atmospheric pressure (which is based on things like the earth's surface temperature and the composition of the atmosphere as well as the mass of the earth).

Asad

Movingviolation
03-09-2004, 10:17 PM
Paul, what would possess you to sell such a beautiful car?



Been driving 240's since I was in high school, I'm just bored with them.

I built my version of the 'ultimate' 240, so there really isn't much more I can do from here. Once the project's done it's boring.

Paul

quest
03-10-2004, 03:21 AM
. "blew away FP big28" ?

fp28 sr has posted 335 ft-lbs wtq. jwt, no cam, no intake
same full wt car went 12.2 @ 12Xmph
what kinda times are these gt25Rs gettin' ?

Enthalpy
03-10-2004, 07:45 AM
LOL at quest.

if you are going to quote TQ numbers you better quote HP as well. any car can make a nice TQ number on a boost spike. but maintaining the TQ curve as well as Paul's GT25R does is the challenge. show me a dynograph of a FP Big28 making 357 Hp and then we can talk. that turbo doesnt have the compressor wheel or the turbine to support almost 360whp. and BTW the greddy intake and 264 cams HURT a big TQ peak more than they help it. put this turbo on a stock intake mani, stock cam, SS turbo manifold car ...and bump the boost to 21 psi like the owner of the "330 ft-lbs" example did and you will find that this turbo probably exceeds that TQ number and still makes more HP.

gunluvS14
03-10-2004, 08:01 AM
wow, nice number, very nice A/F... and amazing torque curve, so flat, it can balance a Magarietta glass http://forums.freshalloy.com/images/graemlins/wink.gif

Hollywood
03-10-2004, 12:16 PM
LOL at quest.

if you are going to quote TQ numbers you better quote HP as well. any car can make a nice TQ number on a boost spike. but maintaining the TQ curve as well as Paul's GT25R does is the challenge. show me a dynograph of a FP Big28 making 357 Hp and then we can talk. that turbo doesnt have the compressor wheel or the turbine to support almost 360whp. and BTW the greddy intake and 264 cams HURT a big TQ peak more than they help it. put this turbo on a stock intake mani, stock cam, SS turbo manifold car ...and bump the boost to 21 psi like the owner of the "330 ft-lbs" example did and you will find that this turbo probably exceeds that TQ number and still makes more HP.



Ya the FP BigT28 uses the stock housings. So it's kinda small, compared to the GT25's compressor size.

Hollywood
03-10-2004, 12:17 PM
LOL at quest.

if you are going to quote TQ numbers you better quote HP as well. any car can make a nice TQ number on a boost spike. but maintaining the TQ curve as well as Paul's GT25R does is the challenge. show me a dynograph of a FP Big28 making 357 Hp and then we can talk. that turbo doesnt have the compressor wheel or the turbine to support almost 360whp. and BTW the greddy intake and 264 cams HURT a big TQ peak more than they help it. put this turbo on a stock intake mani, stock cam, SS turbo manifold car ...and bump the boost to 21 psi like the owner of the "330 ft-lbs" example did and you will find that this turbo probably exceeds that TQ number and still makes more HP.



Ya the FP BigT28 uses the stock housings. So it's kinda small, compared to the GT25's compressor size. The DSM version is even smaller, I installed it on my brothers car.

Hugh
03-10-2004, 12:22 PM
Kinda small? T04S compressor VS T04B compressor? http://forums.freshalloy.com/images/graemlins/grin.gif

quest
03-10-2004, 03:06 PM
well,
avoiding the ifs, maybes, this and that.... I was tryin to see how the gt25r "blew away fp28". Have these things gone mid 11s or somethin', full wt? lemme know.
I think most can relate to a quarter mile 'yardstick'. Again I ask, what r these gt25r turbos runnin' ? Whas the bottom line ?

Is 'hurting', or sacrificing torque for peak hp a good thing in the real world ? I figure the ETs will tell. no?

what compressor/turbine wheels makeup a big28? Seems to be a secret for a while for some reason.... not a big deal when u got $550 brand new complete evo3 16Gs slappin' em silly, I guess. I think only of late FP mentioned gt guts used in the 28.

vosko
03-10-2004, 08:16 PM
i ran 12.8 13psi untuned on my GT25R........ it will run 11's once i tune it and more like 18.5psi of boost http://forums.freshalloy.com/images/graemlins/wink.gif

rednerd
03-10-2004, 08:58 PM
Really, I ran a 13.2@105@14psi (falling off at high rpm obviously) on my t-25. And Enjuku somehow managed a 12.8 on a t-25...

vosko
03-10-2004, 11:38 PM
Really, I ran a 13.2@105@14psi (falling off at high rpm obviously) on my t-25. And Enjuku somehow managed a 12.8 on a t-25...



misfiring also, that was peak boost....CRAP MBC. its going on the dyno sunday. just want to see what its putting down and possibly tune it. we built my car on wednesday and raced it on thursday. first time out in the 12's. i am extremely happy.....i'm an avid drag racer....this car will run 11's very soon

i admire what shops can do but it is not the norm.... unfortunately.

Dave562
03-10-2004, 11:45 PM
i admire what shops can do but it is not the norm.... unfortunately.



True. Car mechanics are kind of like plumbers. Sometimes you have to through a few of the bad ones, to find one who really knows what he is doing.