Ram Jet info
Thread Starter
Safety Car
Joined: Dec 1999
Posts: 4,380
Likes: 1,183
From: Lexington,NC,USA
C1 of Year Finalist (track prepared) 2019
Ram Jet info
I usually hang out in the C1/C2 section, but I know that some of you C3 guys have Ram Jet engines in your cars so I thought this information might be of interest to you. I have had a Ram Jet 350 engine in my wife’s ’62 since 2002. The engine originally had an MEFI3 controller, but I installed the MEFI4 upgrade in March 2006. The MEFI4 system adds an O2 sensor and IAT sensor and is the system currently being shipped on new Ram Jet engines. Ever since the upgrade I have had a problem with the engine in that, under certain operating conditions, the engine would not return to idle when the throttle was closed. I have now solved the problem and thought some of you might be interested in the solution.
Here is a web page that gives the complete story: http://www.carols62.com/ramjet
Even if you are not having any problems with your Ram Jet engine, you may be interested in reading the last few paragraphs on the scanning/tuning software for the MEFI controller.
Charles
Here is a web page that gives the complete story: http://www.carols62.com/ramjet
Even if you are not having any problems with your Ram Jet engine, you may be interested in reading the last few paragraphs on the scanning/tuning software for the MEFI controller.
Charles
Pro
Joined: Nov 2003
Posts: 692
Likes: 1
From: Peabody Ma.
Not to Hijack this thread!
This sounds like a problem I have with my TPI engine! However Im not dealing with anything in the stock nature. My problem occurs while down shifting and making a stop, as I down shift the gears and get to a stop, It seems the IAC is still controlling the idle, In my case its high like yours! If I rev the engine it may come down, maybe not. It sucks withe the 4 spd I dont ave to give it any gas to get moving, Just let out the clutch! If anybody knows how I could fix this let me know!
This sounds like a problem I have with my TPI engine! However Im not dealing with anything in the stock nature. My problem occurs while down shifting and making a stop, as I down shift the gears and get to a stop, It seems the IAC is still controlling the idle, In my case its high like yours! If I rev the engine it may come down, maybe not. It sucks withe the 4 spd I dont ave to give it any gas to get moving, Just let out the clutch! If anybody knows how I could fix this let me know!
Last edited by bruced267; Feb 23, 2008 at 11:33 AM. Reason: spelling
Thread Starter
Safety Car
Joined: Dec 1999
Posts: 4,380
Likes: 1,183
From: Lexington,NC,USA
C1 of Year Finalist (track prepared) 2019
Charles
Le Mans Master
Joined: Aug 2003
Posts: 7,720
Likes: 12
From: Chattanooga TN
Not to Hijack this thread!
This sounds like a problem I have with my TPI engine! However Im not dealing with anything in the stock nature. My problem occurs while down shifting and making a stop, as I down shift the gears and get to a stop, It seems the IAC is still controlling the idle, In my case its high like yours! If I rev the engine it may come down, maybe not. It sucks withe the 4 spd I dont ave to give it any gas to get moving, Just let out the clutch! If anybody knows how I could fix this let me know!
This sounds like a problem I have with my TPI engine! However Im not dealing with anything in the stock nature. My problem occurs while down shifting and making a stop, as I down shift the gears and get to a stop, It seems the IAC is still controlling the idle, In my case its high like yours! If I rev the engine it may come down, maybe not. It sucks withe the 4 spd I dont ave to give it any gas to get moving, Just let out the clutch! If anybody knows how I could fix this let me know!
Le Mans Master
Joined: Jan 2001
Posts: 6,663
Likes: 1,359
Charles,
I'll send you an email to the address on the website you posted above, "charlie at....."
I should be able to see if I can decipher the BIN quickly enough. I run my ramjet 350 with a 730 ECM, so perhaps I can at least use the VE and spark tables? Thanks...
I'll send you an email to the address on the website you posted above, "charlie at....."
I should be able to see if I can decipher the BIN quickly enough. I run my ramjet 350 with a 730 ECM, so perhaps I can at least use the VE and spark tables? Thanks...
Heel & Toe
Joined: Aug 2005
Posts: 24
Likes: 0
Well i dont know about ve tables but it does have spark tables
I am glad you got the cruise control fixed on your mefi charles.
I am the guy in florida that chatted with ya via email with my boat injected powered silverado.
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Melting Slicks
Joined: Nov 2003
Posts: 2,668
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From: St. Charles Mo
CI 5 & 8 Veteran
Charles, Glad you were able solve your problem the correct way without having to jury rig that IAC. 
I remember your post awhile back describing your dilemma. I can't remember the details, but I think I mentioned MSD and OBDII-mefiburn to you or your friend at the time??? Anyway glad you found Bob. He is great guy and very helpful. We purchased the full up pro version of Mefi burn about a year ago here at Competition Marine for all the MEFI's used on boats. What version XDF MEFI4b file are you using with tunerpro? I choose to jump to the Accel Gen VII, but still play with the the old MEFI 3 on the bench that was originally on my RamJet 502. The engine runs soooo much better now that I have a proper tune and a larger TB.
Bullshark
I remember your post awhile back describing your dilemma. I can't remember the details, but I think I mentioned MSD and OBDII-mefiburn to you or your friend at the time??? Anyway glad you found Bob. He is great guy and very helpful. We purchased the full up pro version of Mefi burn about a year ago here at Competition Marine for all the MEFI's used on boats. What version XDF MEFI4b file are you using with tunerpro? I choose to jump to the Accel Gen VII, but still play with the the old MEFI 3 on the bench that was originally on my RamJet 502. The engine runs soooo much better now that I have a proper tune and a larger TB. Bullshark
Thread Starter
Safety Car
Joined: Dec 1999
Posts: 4,380
Likes: 1,183
From: Lexington,NC,USA
C1 of Year Finalist (track prepared) 2019
Melting Slicks
Joined: Nov 2003
Posts: 2,668
Likes: 118
From: St. Charles Mo
CI 5 & 8 Veteran
