R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Nitro Off-Road

Reply
 
Thread Tools Search this Thread
Old 05-08-2008, 07:18 PM   #91
Tech Regular
 
Join Date: Apr 2008
Posts: 334
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by German Muscle View Post
Yes all manufacturer power claims are extreme lies. This was the main reason the X-Dyno was made. Which LRP .28 engine do you have? Should be a Spec 1, 2, or 3
LRP Z.28R Spec.3 Pullstart is what it says on the package. 209.95$

so its a spec 3...
new to rc cars is offline   Reply With Quote
Old 05-08-2008, 07:27 PM   #92
Tech Addict
 
German Muscle's Avatar
 
Join Date: May 2006
Posts: 557
Trader Rating: 8 (100%+)
Default

lemme find the X-Dyno info for ya.
German Muscle is offline   Reply With Quote
Old 05-08-2008, 07:29 PM   #93
Tech Addict
 
German Muscle's Avatar
 
Join Date: May 2006
Posts: 557
Trader Rating: 8 (100%+)
Default

heres the graph. sorry about the camera phone pic.
Peak HP was 1.87HP @ 27,200
Peak TQ was 70.77 @ 25,600
Peak RPM was 42,800
Pipe Used was MSR1005
Plug LRP R6
30% 12% oil fuel was used
German Muscle is offline   Reply With Quote
Old 05-08-2008, 07:41 PM   #94
Tech Master
 
Join Date: Feb 2006
Location: Michigan, USA
Posts: 1,199
Trader Rating: 47 (100%+)
Default

Back to the topic.. +1 Novarossi P5XS
Kingsbury is offline   Reply With Quote
Old 05-08-2008, 08:32 PM   #95
Tech Regular
 
Join Date: Apr 2008
Location: OC, So Cal
Posts: 364
Trader Rating: 4 (100%+)
Default

I would go RB. I have had a total of 5 RB .21 engines between S7s and WS7s. The only one that ever broke was Andrew Smolnik's fault, not the engines.

They are awesome motors. Great life, great power and great fuel economy. I just broke in a new s7 for my new car yesterday.
largeorangefont is offline   Reply With Quote
Old 05-08-2008, 08:42 PM   #96
Tech Champion
 
Maximo's Avatar
R/C Tech Elite Subscriber
 
Join Date: Jan 2005
Posts: 7,900
Trader Rating: 11 (100%+)
Default

Quote:
Originally Posted by German Muscle View Post
heres the graph. sorry about the camera phone pic.
Peak HP was 1.87HP @ 27,200
Peak TQ was 70.77 @ 25,600
Peak RPM was 42,800
Pipe Used was MSR1005
Plug LRP R6
30% 12% oil fuel was used
those results are extremely optimistic..i guarantee its only 1.5 HP on Adams dyno.....
Maximo is offline   Reply With Quote
Old 05-08-2008, 09:23 PM   #97
Tech Champion
 
Maximo's Avatar
R/C Tech Elite Subscriber
 
Join Date: Jan 2005
Posts: 7,900
Trader Rating: 11 (100%+)
Default

All I know is I have used dynoes to develop exhaust systems and camshaft designs for various products I sold in several niche market auto's.. I could not imagine trying to develop the fuel maps of the flash module for the camshafts without the use of a dyno....Dyno's are a wonderful tool if your smart enough to understand and use them.. And if any of you here are truly stupid enough to believe someone would buy an X-Dyno just for bragging rights needs to get their heads out of their ass....... That dyno is what will separate the men from the boys when it comes to engine development and modifications.....

But I also can tune a motor according to how it runs on a track... when I develop an engine series I usually start with a safe base timing and port cut I know works well ( Stage 1), from there I run the motor hard thru its paces and evaluate its overall performance and where I feel I can best add my touch to the engine........If a motor needs more low end I tweak the transfer timing, if it needs more top I alter boost angle or increase blowdown timing etc... But int he end I slowly push an engine and its timing to maximum limits, but I do do it slowly and in steps..and usually solely based off track and drag testing.......... from there I will send a motor to Adam at AB and have it dynoed, and from there Adam will add some tweaks using the dyno as reference.........In the end we have some dam nasty motors that amazingly enough get stellar fuel mileage....... But its a combination of both track,drag and dyno testing that creates the ultimate engines IMHO !!!


Blowpop just wait till you crack open the OS 28, its like unleashing the gates of hell !!!!!!!
Maximo is offline   Reply With Quote
Old 05-08-2008, 09:48 PM   #98
Tech Master
 
Revo-lution's Avatar
 
Join Date: Apr 2008
Location: TN
Posts: 1,362
Trader Rating: 14 (100%+)
Default

Quote:
Originally Posted by Maximo View Post
those results are extremely optimistic..i guarantee its only 1.5 HP on Adams dyno.....
Really, my engine is a .21 and is supposed to make a full 1hp more. Wonder what my engine actually would do on a dyno.

Specs
Rated Horsepower: 2.62hp
RPM (at max power): 31,800
Practical RPM Range: 6,000 - 38,000

http://www.carolinasrc.com/Webstore/...idProduct=4397
__________________
~ Go big or go home ~
~ Novarossi powered 8T 1.0 - A.K.A. 4.0~
Revo-lution is offline   Reply With Quote
Old 05-08-2008, 10:01 PM   #99
Tech Regular
 
Join Date: Apr 2008
Posts: 334
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by German Muscle View Post
heres the graph. sorry about the camera phone pic.
Peak HP was 1.87HP @ 27,200
Peak TQ was 70.77 @ 25,600
Peak RPM was 42,800
Pipe Used was MSR1005
Plug LRP R6
30% 12% oil fuel was used
damn, thats awesome.

I wonder why they lie so much, thats a little ridiculous.
new to rc cars is offline   Reply With Quote
Old 05-08-2008, 10:07 PM   #100
Tech Champion
 
Maximo's Avatar
R/C Tech Elite Subscriber
 
Join Date: Jan 2005
Posts: 7,900
Trader Rating: 11 (100%+)
Default

Quote:
Originally Posted by Revo-lution View Post
Really, my engine is a .21 and is supposed to make a full 1hp more. Wonder what my engine actually would do on a dyno.

Specs
Rated Horsepower: 2.62hp
RPM (at max power): 31,800
Practical RPM Range: 6,000 - 38,000

http://www.carolinasrc.com/Webstore/...idProduct=4397

it would make about 1.2-1.3 HP and 53 oz/in aproxx
Maximo is offline   Reply With Quote
Old 05-08-2008, 10:12 PM   #101
Tech Addict
 
wes95_z28's Avatar
 
Join Date: Nov 2006
Location: Norman, Ok
Posts: 747
Trader Rating: 3 (100%+)
Default

Quote:
Originally Posted by pracy View Post
dyno's are not just bragging rights. I must ask, how do you set and develop you ignition curves on your marine motors if you dont use a dyno? by feel?

ignition curve
AF ratio (airfuel)
torque curve
clutch engagement or torque converter
varibles between different engine parts using previous set points includ AF ratio


these are just a couple things the dyno can do, which you can not by feel. you might think you can but you cant beat a computer doing the maths for you.

sorry to chime in but I have used and sometimes not used dyno's for years now and spent more money then most of big horsepower engines. I can say the dyno is very useful in developing the combinations. once its sorted, well yes then its just bragging rights... my 2c.
Lake testing, real world testing. Not sitting on a damn dyno. In no way shape or form can you recreate real world senarios on a dyno. We start off with what we know is a rich tune and a safe ignition advance timing. Then we use our ass dyno on the lake to obtain optimum performance. Hate to tell you guys that that is always the way top fuel dragsters are done as well as nascar and everyone else. 90% of the info they get is done on the track. Not on a dyno.
__________________
Wes

Kyosho 777 WC w/ big bores, RB S5, ACE 1313 s., Air 357 t., JP-3
HPI Savage X SS, Axial .28, Hitec 5645 Steering servo
Nitro TC3, O.S. .18 CV-R
Associated RC18T, Brushless, Lipo
wes95_z28 is offline   Reply With Quote
Old 05-08-2008, 10:30 PM   #102
Tech Addict
 
German Muscle's Avatar
 
Join Date: May 2006
Posts: 557
Trader Rating: 8 (100%+)
Default

Quote:
Originally Posted by wes95_z28 View Post
Lake testing, real world testing. Not sitting on a damn dyno. In no way shape or form can you recreate real world senarios on a dyno. We start off with what we know is a rich tune and a safe ignition advance timing. Then we use our ass dyno on the lake to obtain optimum performance. Hate to tell you guys that that is always the way top fuel dragsters are done as well as nascar and everyone else. 90% of the info they get is done on the track. Not on a dyno.
NASCAR actually uses a Dynojet Dyno
German Muscle is offline   Reply With Quote
Old 05-09-2008, 06:57 AM   #103
Tech Master
 
Revo-lution's Avatar
 
Join Date: Apr 2008
Location: TN
Posts: 1,362
Trader Rating: 14 (100%+)
Default

Quote:
Originally Posted by Maximo View Post
it would make about 1.2-1.3 HP and 53 oz/in aproxx
Well I must admit I did ask, but I would guess it to be more like 55-60% of rated power rather than 40%. If it were a GO engine or something I'd say 40%, but not the newest Nova's. 7 port (crankcase) over 5 port (sleeve) on the new Nova plus 21-5k rather than 5 port over 5 port on the old 21 plus.
__________________
~ Go big or go home ~
~ Novarossi powered 8T 1.0 - A.K.A. 4.0~
Revo-lution is offline   Reply With Quote
Old 05-09-2008, 09:38 AM   #104
Tech Champion
 
Maximo's Avatar
R/C Tech Elite Subscriber
 
Join Date: Jan 2005
Posts: 7,900
Trader Rating: 11 (100%+)
Default

Quote:
Originally Posted by Revo-lution View Post
Well I must admit I did ask, but I would guess it to be more like 55-60% of rated power rather than 40%. If it were a GO engine or something I'd say 40%, but not the newest Nova's. 7 port (crankcase) over 5 port (sleeve) on the new Nova plus 21-5k rather than 5 port over 5 port on the old 21 plus.
The latest Novarossi's have been really de-tuned compared to the older Nova's...... the old 421 was 1.8 HP and 70 oz/in...the 21-7 is 1.17 HP and 53 oz/in

I own a 21-7 and its not an overly powerful motor compared to its competitors...

heres an overlay of a Picco P7R and 21-7 on the same dyno


Last edited by Maximo; 05-09-2008 at 10:59 AM.
Maximo is offline   Reply With Quote
Old 05-09-2008, 12:08 PM   #105
Tech Regular
 
Join Date: Dec 2006
Posts: 373
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by wes95_z28 View Post
Lake testing, real world testing. Not sitting on a damn dyno. In no way shape or form can you recreate real world senarios on a dyno. We start off with what we know is a rich tune and a safe ignition advance timing. Then we use our ass dyno on the lake to obtain optimum performance. Hate to tell you guys that that is always the way top fuel dragsters are done as well as nascar and everyone else. 90% of the info they get is done on the track. Not on a dyno.

I totally understand. I am a former ASE certified auto mechanic and I adjust timing by ear and have a torque wrench in my wrist, not. Sometimes the difference between a professional mechanic and a shade tree mechanic is more than just the shadetree. Professional mechanics will use the latest and greatest tools available to perfect the art of their craft, atleast thats how I did it.
blowpopracer is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Buying A TT-01 Ausdrifter Electric On-Road 2 01-24-2007 05:18 AM
BUYING BUYING BUYING mt/mini/8th/any Resale_Warehous R/C Items: Wanted to Buy 3 08-21-2006 01:38 PM
buying a car godfather1 Rookie Zone 1 02-07-2006 04:48 AM
need your help for buying mattech R/C Items: For Sale/Trade 5 01-12-2005 03:01 AM
buying a new car GReddy Electric On-Road 12 11-19-2004 06:56 PM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 02:23 PM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net