R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 05-10-2009, 06:06 AM   #1
Tech Elite
 
Join Date: Mar 2009
Posts: 3,657
Trader Rating: 5 (100%+)
Default switching nitro fuel

I Have my engine tuned for 20% well i am out of 20% and all i have right now (all the shops are closed today) is 30%. How much will the tune change in my engine if i run this just for today?
dreaux is offline   Reply With Quote
Old 05-10-2009, 06:11 AM   #2
Tech Master
 
OfnaJoe's Avatar
 
Join Date: Dec 2008
Location: Bristol Va
Posts: 1,570
Trader Rating: 58 (100%+)
Default

Alot, you will need to reshim your head to run 30%.
I think you are using a OS engine, I think it will need a .1mm shim to use 30%
OfnaJoe is offline   Reply With Quote
Old 05-10-2009, 06:19 AM   #3
Regional Moderator
 
marccaracer's Avatar
 
Join Date: Feb 2007
Location: baraboo wisconsin
Posts: 1,518
Trader Rating: 10 (100%+)
Default

You just had the OS guy tune your engine. I would leave it alone and wait for your 20% fuel.

Rushing things and decisions usually leads to a new set of problems. You seem to have more than your share. Patience.
__________________
Jeff Mann
marccaracer is offline   Reply With Quote
Old 05-10-2009, 08:21 AM   #4
Tech Addict
 
Join Date: Oct 2008
Location: Foley, Al
Posts: 516
Trader Rating: 1 (100%+)
Default

I wouldnt run 30% since an OS mechanic just got it running good for you, especially just for the day.
__________________
Making a comeback !!
roadracer43 is offline   Reply With Quote
Old 05-10-2009, 08:31 AM   #5
Tech Adept
 
SPEED37's Avatar
 
Join Date: Jan 2009
Location: Last Best Place
Posts: 159
Trader Rating: 3 (100%+)
Default

Your v-spec will run 30% just like it is, no shim needed.....but why ruin the tune you just got?
__________________
JAMMIN X2 CRT/HOUSTON/NOVAROSSI P5XS/OFNA-053
JAMMIN X2 CR/NOVAROSSI
SPEKTRUM/DX3S
BCG INDUSTRIES= Absolutely the best paint on the planet.
TEAM TERRIBLES
SPEED37 is offline   Reply With Quote
Old 05-10-2009, 10:50 AM   #6
Tech Master
 
Join Date: Aug 2006
Location: Oceanside CA
Posts: 1,075
Default

What if the weather is 30 deg hotter next weekend or it rains?Your gonna have to retune anyway,might as well learn now & maybe that guy or his friend will be back next week to help if you screw up.If your real worried mark the housings by scratching with a screwdriver or something & take a picture so you can put the screws back where they were just pay attention & write down wich direction & how much you turned.Same brand fuel up 10% nitro aint gonna need drastic jetting anyway few hours here & there.If you change brands it may be a different story.
butch man is offline   Reply With Quote
Old 05-10-2009, 02:51 PM   #7
Tech Addict
 
Ephidelt490's Avatar
 
Join Date: Nov 2004
Location: Hammond, Louisiana
Posts: 621
Trader Rating: 17 (100%+)
Send a message via AIM to Ephidelt490
Default

Lol, I tuned it. I don't work for O.S. nor am I an O.S. mechanic. I am on the O.S. Race team and have tuned a few over the past couple years .

Richen up your high and low needles a couple hours if you are worried and switch to 30%. No shims are needed.
__________________
[Action Hobbies] [Team Associated] [Futaba] [O'Donnell Fuels] [JConcepts] [DNA Designs]
Ephidelt490 is offline   Reply With Quote
Old 05-10-2009, 04:00 PM   #8
Tech Adept
 
Join Date: Oct 2008
Posts: 118
Trader Rating: 5 (100%+)
Default friend

nothing like going to the track and making new friends.
jdcavin is offline   Reply With Quote
Old 05-10-2009, 04:06 PM   #9
Tech Elite
 
Join Date: Mar 2009
Posts: 3,657
Trader Rating: 5 (100%+)
Default

Quote:
Originally Posted by Ephidelt490 View Post
Lol, I tuned it. I don't work for O.S. nor am I an O.S. mechanic. I am on the O.S. Race team and have tuned a few over the past couple years .

Richen up your high and low needles a couple hours if you are worried and switch to 30%. No shims are needed.
wow thats pretty cool. Small world. Thanx again for everything man. You were a big help.
dreaux is offline   Reply With Quote
Old 05-10-2009, 04:13 PM   #10
Tech Addict
 
Ephidelt490's Avatar
 
Join Date: Nov 2004
Location: Hammond, Louisiana
Posts: 621
Trader Rating: 17 (100%+)
Send a message via AIM to Ephidelt490
Default

No problem. Don't drive it through any puddles any more .
__________________
[Action Hobbies] [Team Associated] [Futaba] [O'Donnell Fuels] [JConcepts] [DNA Designs]
Ephidelt490 is offline   Reply With Quote
Old 05-10-2009, 04:54 PM   #11
Tech Elite
 
Join Date: Mar 2009
Posts: 3,657
Trader Rating: 5 (100%+)
Default

i can see a BIG power/speed jump with the 30% or maybe my engine just likes traxxas fuel better (over trinity). I don't know, but it was more power then i could handle.
dreaux is offline   Reply With Quote
Old 05-10-2009, 04:58 PM   #12
Tech Elite
 
Join Date: Mar 2009
Posts: 3,657
Trader Rating: 5 (100%+)
Default

one question. If you are bliping around the track and when you get to the straight away and you and you build up for wot if it bogs down is it still to rich??? If i make a couple high speed passes there is no bogging down. does this mean i am my engine is too rich and getting loaded with fuel??? Still not going over 220 230. I need more zip in the straight away.
dreaux is offline   Reply With Quote
Old 05-12-2009, 07:45 AM   #13
Tech Lord
 
Frank L's Avatar
 
Join Date: Dec 2008
Location: NorCal
Posts: 12,500
Trader Rating: 148 (100%+)
Default

Quote:
Originally Posted by dreaux View Post
one question. If you are bliping around the track and when you get to the straight away and you and you build up for wot if it bogs down is it still to rich??? If i make a couple high speed passes there is no bogging down. does this mean i am my engine is too rich and getting loaded with fuel??? Still not going over 220 230. I need more zip in the straight away.
Try a high speed pipe like a 086 with a short smooth header. The short header will increase top end and so will a speed pipe. There are other speed pipes but a 086 is a good place to start. Also you can add a shim to the head to decrease compression and get a few more rpm out of the engine. Also change the clutch or spur to increase the top end. Larger bell of smaller spur gear will increase the top speed. Up 1 tooth on the bell or down 2 teeth on the spur gear.
__________________
- X-Ray/ RC America Team Driver - MKS -
- XB8 - XB8T - XB8 E - OS Spec III - B2102 - 4PXR -
~ SSC ~ Godfather ~ Ironman ~ ButterySmooth ~
Frank L is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Go-Tech Engines Thread MassiveMods Offroad Nitro Engine Forum 15106 06-26-2017 04:07 AM
Off Road Thread (ALL SCALES UNITE) suntok2 Manila Racers 18645 01-07-2016 01:13 AM
HPI R40 Nitro Car Forum EVOLUTION Nitro On-Road 11979 06-26-2012 07:57 PM
Engine Tuning 101 (General Tuning) Kemorc Onroad Nitro Engine Zone 41 11-19-2007 06:04 PM
Blogging engine rko Nitro On-Road 8 08-04-2005 04:27 PM
Performance fuel ? asw7576 Onroad Nitro Engine Zone 35 02-03-2005 09:38 AM
Revo temp stuck!! TurboLancer Electric Off-Road 12 11-29-2004 07:22 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 02:19 AM.


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