Like Tree1Likes

"the tuning bible"

Reply

Old 10-11-2009, 01:05 PM
  #151  
Tech Champion
 
Roelof's Avatar
 
Join Date: Aug 2007
Location: Holland
Posts: 7,253
Default

Originally Posted by NitroWD View Post
if high idle takes a longer time to drop, it's not as rich as one which the high idle takes a lesser time to drop.
A dropping idle can also be caused by just cooling down the engine which is atomaticly done at idle when getting the right/rich mixture. The cilinder sceezes again giving the piston more friction and so slowing it down.
Depending on the status of the P/S set the effect can be more or less noticeable.
Roelof is online now  
Reply With Quote
Old 10-12-2009, 05:18 PM
  #152  
Tech Fanatic
iTrader: (25)
 
unsp0ken's Avatar
 
Join Date: Feb 2007
Location: Fontana, CA
Posts: 781
Trader Rating: 25 (100%+)
Default relationship between throttle and fuel consumption

question for you guys...

is the fuel being consumed at any given moment proportional to the amount that the throttle is being pulled?

so is there a decent amount of difference in fuel consumption at 1/2 throttle vs full throttle?
unsp0ken is offline  
Reply With Quote
Old 10-12-2009, 05:35 PM
  #153  
Tech Elite
iTrader: (25)
 
Racecrafter's Avatar
 
Join Date: Apr 2007
Location: RC Mecca
Posts: 4,138
Trader Rating: 25 (96%+)
Default

Originally Posted by unsp0ken View Post
question for you guys...

is the fuel being consumed at any given moment proportional to the amount that the throttle is being pulled?

so is there a decent amount of difference in fuel consumption at 1/2 throttle vs full throttle?
Proportionally speaking it depends alot on the carburetor and the needle taper being used.
Racecrafter is offline  
Reply With Quote
Old 10-12-2009, 05:52 PM
  #154  
Tech Fanatic
iTrader: (25)
 
unsp0ken's Avatar
 
Join Date: Feb 2007
Location: Fontana, CA
Posts: 781
Trader Rating: 25 (100%+)
Default

Originally Posted by Racecrafter View Post
Proportionally speaking it depends alot on the carburetor and the needle taper being used.
just to make sure i'm understanding correctly...

i think you are saying that there is a relationship between the amount of throttle pull and consumption but the relationship varies depending on the carburetor?
unsp0ken is offline  
Reply With Quote
Old 10-12-2009, 09:41 PM
  #155  
Tech Master
 
Lille-bror's Avatar
 
Join Date: Jul 2009
Location: Frederikshavn, Denmark
Posts: 1,792
Default

Hi.

On my plane engines the throttle opening vs rpm is not linear:

Half open throttle = approx. 8500 RPM
Fully open throttle = approx. 12400 RPM

It is not the same type of carburators, but the function is the same.

It makes good sense, that you can drive a car as fast with a modest throttle finger instead of idle/fully open throttle. My guess is that the perhaps last 3000 RPM is the RPM range that really needs A LOT of fuel to achieve.

Cheers

EDIT: I could make some tests next year and calculate the RPM's with 1/4, 1/2, 3/4 and 1/1 open throttle. Could be alot of fun
Lille-bror is offline  
Reply With Quote
Old 10-12-2009, 10:13 PM
  #156  
Tech Prophet
Thread Starter
iTrader: (95)
 
houston's Avatar
 
Join Date: Sep 2004
Location: Sherwood,OR
Posts: 15,555
Trader Rating: 95 (100%+)
Default

Originally Posted by Lille-bror View Post
Hi.

On my plane engines the throttle opening vs rpm is not linear:

Half open throttle = approx. 8500 RPM
Fully open throttle = approx. 12400 RPM

It is not the same type of carburators, but the function is the same.

It makes good sense, that you can drive a car as fast with a modest throttle finger instead of idle/fully open throttle. My guess is that the perhaps last 3000 RPM is the RPM range that really needs A LOT of fuel to achieve.

Cheers

EDIT: I could make some tests next year and calculate the RPM's with 1/4, 1/2, 3/4 and 1/1 open throttle. Could be alot of fun
I see rod replacement in your future ;-) LOL
houston is offline  
Reply With Quote
Old 10-12-2009, 10:34 PM
  #157  
Tech Master
 
Lille-bror's Avatar
 
Join Date: Jul 2009
Location: Frederikshavn, Denmark
Posts: 1,792
Default

... with the car driving on the track god damn it!
Lille-bror is offline  
Reply With Quote
Old 10-13-2009, 08:19 AM
  #158  
Tech Prophet
Thread Starter
iTrader: (95)
 
houston's Avatar
 
Join Date: Sep 2004
Location: Sherwood,OR
Posts: 15,555
Trader Rating: 95 (100%+)
Default

Originally Posted by Lille-bror View Post
... with the car driving on the track god damn it!
Easy now , don't get too excited
houston is offline  
Reply With Quote
Old 10-14-2009, 11:07 PM
  #159  
Tech Rookie
 
Join Date: Oct 2009
Posts: 2
Default

I think this is enough .....
I do agree with you. Those are the most effective way
hadspimou is offline  
Reply With Quote
Old 12-13-2009, 06:53 PM
  #160  
Tech Initiate
 
nathsp2's Avatar
 
Join Date: Dec 2009
Posts: 26
Default thanks

hey im new to nitro i just want to say thanks to all the experienced race and tech guys that take the time to post this sort of info its great it may be common knowledge for most but this article probably just saved me 300$ on a motor replacement once again thanks
nathsp2 is offline  
Reply With Quote
Old 12-15-2009, 01:34 AM
  #161  
Tech Prophet
Thread Starter
iTrader: (95)
 
houston's Avatar
 
Join Date: Sep 2004
Location: Sherwood,OR
Posts: 15,555
Trader Rating: 95 (100%+)
Default

Originally Posted by nathsp2 View Post
hey im new to nitro i just want to say thanks to all the experienced race and tech guys that take the time to post this sort of info its great it may be common knowledge for most but this article probably just saved me 300$ on a motor replacement once again thanks
Its all about sharing the info to help a fellow racer out

I'm glad you found the article useful

Happy motorin',
Monty
houston is offline  
Reply With Quote
Old 01-03-2010, 09:50 PM
  #162  
Tech Apprentice
iTrader: (9)
 
Join Date: Dec 2009
Posts: 67
Trader Rating: 9 (100%+)
Default

I have a HYPER MACH 28 it wont break lean till the motor temps get to 260 and screams went you lean it out by one hour. Thats from on top of the glow plug. There is steady thick smoke trail the hole time. bottom is perfect. The bearing are very smooth. Any advise would be helpfull.

Thanks bigmack
bigmack1971 is offline  
Reply With Quote
Old 01-03-2010, 10:01 PM
  #163  
Tech Prophet
Thread Starter
iTrader: (95)
 
houston's Avatar
 
Join Date: Sep 2004
Location: Sherwood,OR
Posts: 15,555
Trader Rating: 95 (100%+)
Default

Originally Posted by bigmack1971 View Post
I have a HYPER MACH 28 it wont break lean till the motor temps get to 260 and screams went you lean it out by one hour. Thats from on top of the glow plug. There is steady thick smoke trail the hole time. bottom is perfect. The bearing are very smooth. Any advise would be helpfull.

Thanks bigmack
what kinda temp probe?

you might be sticking the probe wau too deep or the probe is way off.

tune by sound , the engine will let you know if its too lean by bogging on the low speed or the high speed
houston is offline  
Reply With Quote
Old 01-03-2010, 10:16 PM
  #164  
Tech Apprentice
iTrader: (9)
 
Join Date: Dec 2009
Posts: 67
Trader Rating: 9 (100%+)
Default

One temp probe is a fluke other is extech. both are with in a few deq. of each other. The bottom end still has a little bog to it . I like for it to bog a little ,that way i burn the tire off on corners. It sound way too rich , when it sounds great the temps are over 300. Thanks for your info.

Bigmack
bigmack1971 is offline  
Reply With Quote
Old 01-18-2010, 07:24 PM
  #165  
Tech Prophet
Thread Starter
iTrader: (95)
 
houston's Avatar
 
Join Date: Sep 2004
Location: Sherwood,OR
Posts: 15,555
Trader Rating: 95 (100%+)
Default

NOVAROSSI ENGINE TUNING
hsn is the control valve, set the control valve to limit high rpm's first when final race tuning . after doing so go to the lsn and lean until the engine keeps a consistent idle but does not ting when idling or starve for fuel as a quick throttling is applied , that is caused from lack of fuel on lsn . lower the idle until it is as low as you can get it and it will maintain a good safe idle during on track deceleration and on the bench for at the least 20 sec.
after you do the low end you will usually have to richen the hsn about 1-2 hours

there will be a few things that will need to be tweaked slightly but that will get you in the ball park .

OTHER ENGINES TUNE DIFFERENTLY !!!!

from page 1

the needles do effect one another yes , you need to find the proper balance between hsn and lsn , once this is done that balance doesnt change much .

Last edited by houston; 01-19-2010 at 10:09 AM.
houston is offline  
Reply With Quote

Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service