RC On Road Nitro Cars Discuss all aspects of on-road nitro rc cars here

question for the tuning guru's

Old 04-05-2011, 03:33 AM
Junior Member
Thread Starter
Join Date: Apr 2007
Location: Birmingham, SD
Posts: 15
Likes: 0
Received 0 Likes on 0 Posts
Default question for the tuning guru's

My idle speed screw is set so i have a 1-1.5 gap in the carb,.

My questions are

Why do I need to apply trim to start the car?
Why do I need to keep some trim to keep the car running? even though the wheels still spin whilst off the ground.

thanks as always

Old 04-05-2011, 05:35 AM
My Feedback: (4)
378's Avatar
Join Date: Jan 2004
Location: Lebanon, TN
Posts: 2,854
Likes: 0
Received 2 Likes on 2 Posts
Default RE: question for the tuning guru's

1: Sometimes the engine needs a bit more throttle to fire off. Mine likes to sputter unless I trim in a bit of throttle.
2: Same reason your full scale car has to fast idle for a few minutes. Cold engines just don't like to idle. You don't have to trim in enough idle to spin the tires though. Most EFI full scale cars jump up to 1800-2100RPM the moment they fire, then within a few seconds they drop down to roundabout 1200-1500. Same thing applies to glow engines, only it's done by you instead of a computer. Once it's warmed up for 30-45 seconds it should be able to idle normally.
Old 04-05-2011, 08:31 AM
Senior Member
Anthoop's Avatar
Join Date: Feb 2007
Location: Somerset, UNITED KINGDOM
Posts: 2,324
Likes: 0
Received 0 Likes on 0 Posts
Default RE: question for the tuning guru's

When the engine is warm then you can return the trim to normal? If the answer is no then LSN is too rich.

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

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.