Turk
Tech Advisor
Here is Jeff,s apex front mount dyno numbers from dynotech.
Not too Shabby!!!!!! I would like to see the hp #,s running a 12:1 AFR. That was pig stinking rich!!!!
Not too Shabby!!!!!! I would like to see the hp #,s running a 12:1 AFR. That was pig stinking rich!!!!
Turk said:
You want one, you know you do. Just cut the cheque already and lets get started...
SPEED
TY 4 Stroke Junkie
Jim , You could have it ready in time for the road trip east 
yeah turk that was my sled, I am going to get the Air Fuel dialed in up in the snow, we where just being cautious for the dyno. I am sure she will make bigger numbers.
SPEED said:Jim , You could have it ready in time for the road trip east
Actually, Turk has a Nytro this year. I don't think Jeff will be shipping those kits until sometime in Jan. I need it in the shop for a week-end for everything I'd want to do, and then it can be unleashed.
My plan is to keep harping on Turk until he gives in. Jeff's kit on this sled, me rubbing the engine's belly a little, Turk's warehouse of clutch parts and the thing would be evil!
I'm close to pulling the trigger on a new Nytro myself. Mrs. Lakercr doesn't mention the winter of '04 that I spent in the ICU nearly as much as she used to...
Approximate CFM, Efficiency, and Pressure Ratio
MPI Stage-I 310 CFM (@ 65%) (1.8 PR)
CPR modified GT25? 405 CFM (@ 60%) (2.0 PR)
Both SC & TC runs in the 10s for Air/Fuel
11lbs --- MPI SC --- CPR TC
6700 --- 127.9 ------ 129.5
7200 --- 144.9 ------ 147.4
7700 --- 159.4 ------ 165.3
8200 --- 170.7 ------ 175.7
8700 --- 185.4 ------ 191.6
9200 --- 201.8 ------ 214.1
9700 --- 218.7 ------ 234.6
10,100 --------------- 246.7
10,700 - 241.7 --------------
rx1 fern
TY 4 Stroke Junkie
yeah turk ,get the turbo .we know you want too.lol.boost is awesome.you know all about it.
kinger
VIP Member
- Joined
- Jan 17, 2005
- Messages
- 7,403
- Reaction score
- 1,539
- Points
- 1,963
- Location
- Clear Lake, IA
- Website
- www.piergenius.com
Hammer is the Sc on pump fuel do you know?
I was under the impression a SC will make the same power as a TC but you have to run 50/50 race fuel on the SC and the TC does it on pump.
I was under the impression a SC will make the same power as a TC but you have to run 50/50 race fuel on the SC and the TC does it on pump.
SPEED
TY 4 Stroke Junkie
S/C was on a fifty fifty mix although the last few pulls on the dyno were on Sunoco premium only
Compression Ratio, Cam Timing, Ignition Timing, Intake Temperatures have a HUGE effect on octane requirements. In this case the CPR kit has a larger more efficient compressor and a larger more efficient (fan assisted) intercooler. I would have liked to seen the actual ambient vs intake charge temperatures in both of the systems for comparison. Stock engine for Stock engine the pressure ratio and intake charge temps would be the deciding factor for octane requirements.
Other gee-wiz-info approximates:
1 HP equal to 1.45 CFM
1 CFM equal to 0.0745 pound of air/min
0.108 pound of air/min equal to 1 HP
1 HP = 1.3405 KW
Other gee-wiz-info approximates:
1 HP equal to 1.45 CFM
1 CFM equal to 0.0745 pound of air/min
0.108 pound of air/min equal to 1 HP
1 HP = 1.3405 KW
mbarryracing
TY 4 Stroke God
- Joined
- Aug 31, 2007
- Messages
- 1,923
- Reaction score
- 192
- Points
- 1,078
- Location
- Springville NY
- Country
- USA
- Snowmobile
- 2006 Yamaha Attak Turbo
2015 SR Viper RTX-DX
1996 Vmax 600XT
DynoTech Research / C&H Dyno is an awesome place. Addicting...
Jim is the man.
Jim is the man.
hlmrx1
TY 4 Stroke Guru
kinger said:
Yep, I was under the same impression, what I don't understand is why would you have to run 50/50 race fuel and # 1 pump gas on the SC and not the TC, say you were running 12lbs. on both with stock engines? Can anyone explain that in simple terms?
Compressing air creates heat see Boyle's Gas Law or Adiabatic Efficiency
(compressor pressure, charge density, combustion chamber ratio/design)
Gasoline’s autoignition temperature is approximately 495*F
(Terms used: pre-ignition, detonation, autoignition)
The more efficient your compressor/intercooler the lower your intake charge temps
(adiabatic efficiency and aftercooling)
The lower the intake charge temperature the lower the octane requirement will be
(less likely to ignite before the spark plug initiates combustion)
I just finished installing one of these for a customer today. If you can tie your own shoes and don't need help cutting the steak at dinner time, you can absolutely install this kit yourself (although I still think you should pay me to do it...).
Seriously, everything is very well thought out. From the boost pressure activated intercooler fan to the design of the heat management components, this is a very well engineered kit. The numbers above speak for themselves, and they are guaranteed.
I wasn't missing a single part, everything that had to attach to factory mounting locations lined up perfectly (don't underestimate how difficult that is to do in mass production) and the final fit/finish is exceptional.
In the interests of full disclosure, I do sell CPR kits. If my opinion seems biased, I can certainly understand that. Bottom line, this is a solid kit.
Seriously, everything is very well thought out. From the boost pressure activated intercooler fan to the design of the heat management components, this is a very well engineered kit. The numbers above speak for themselves, and they are guaranteed.
I wasn't missing a single part, everything that had to attach to factory mounting locations lined up perfectly (don't underestimate how difficult that is to do in mass production) and the final fit/finish is exceptional.
In the interests of full disclosure, I do sell CPR kits. If my opinion seems biased, I can certainly understand that. Bottom line, this is a solid kit.
Great kit, I installed it myself without the video, just a few pics that Allen Ulmer sent me. easy to install, Just depending on what gauges etc. you use, that takes longer then anything. and spend the time on wiring and hose routes etc. a clean install is always better to work on in the future.
Great Kit, Great support network for this kit. Glad I went the turbo way.
Boost is GOOD!!!!!!
Great Kit, Great support network for this kit. Glad I went the turbo way.
Boost is GOOD!!!!!!
