I am getting ready to fire up my twin turbo 414 inch SBC for the first time and I remember reading somewhere on line or in the manual (but I can't find it now) that the initial values and cold start maps are already loaded into MS and are for a aspirated V8 SBC. If this is correct I am wondering how close the cold start setup is, even though I am boosted and I realize I will have to tune the VE and so forth I am just curious as to whether or not my engine will start right up and idle. Any help is appreciated.
Jim
Check out www.jametalworks.com to see the S10 that the engine is in, the pics on the website are very old and the truck is almost done.
Initial tune in MS = V8 SBC?
Forum rules
Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0). For tuning/troubleshooting questions, please attached a datalog and your MSQ file to your post.
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The full forum rules are here: Forum Rules, be sure to read them all regularly.
Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0). For tuning/troubleshooting questions, please attached a datalog and your MSQ file to your post.
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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Ollie8974
Re: Initial tune in MS = V8 SBC?
You need to read these two manuals.
http://www.megamanual.com/ms2/tune.htm
and
http://www.megamanual.com/ms2/configure.htm
http://www.megamanual.com/ms2/tune.htm
and
http://www.megamanual.com/ms2/configure.htm
Re: Initial tune in MS = V8 SBC?
Yeah Thanks, I have read them a couple of times and I know I am in for a duanting task of tuning this thing, I was just curious as to how close the cold start stuff would be. My buddies' car has a FAST system on it and tuning the cold start was a bear.
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Ollie8974
Re: Initial tune in MS = V8 SBC?
If you have set the constants in Megatune 2.25 the engine should run the first time.
Re: Initial tune in MS = V8 SBC?
Great, Thanks Ollie. That is what I was hoping to hear.
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242ATL
- MegaSquirt Newbie
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Re: Initial tune in MS = V8 SBC?
To tune cold start, I take it one day at a time. I open MT and look at what the temps are, then crank. If it doesn't start, I up the cranking pw a few milliseconds, then recrank. If it starts, I leave it until the next day and reevaluate it then.
If it starts and dies, I up the afterstart enrichment around that temp a few bits.
If it starts and stays running, but is leaner than I'd like (leaner than 14:1) I'll up the warmup enrichment around those temps.
Starting with a running car, I think it took me about a week to get good consistent cold starts. Now that the nighttime temps have dropped into the 20's I follow the same procedure as above, but at the lower temps on the maps.
The trick is to not add too much at once... small changes in the cold start are best. Big changes get you flooded.
Not sure if this helps, or is even on topic.
Mike
If it starts and dies, I up the afterstart enrichment around that temp a few bits.
If it starts and stays running, but is leaner than I'd like (leaner than 14:1) I'll up the warmup enrichment around those temps.
Starting with a running car, I think it took me about a week to get good consistent cold starts. Now that the nighttime temps have dropped into the 20's I follow the same procedure as above, but at the lower temps on the maps.
The trick is to not add too much at once... small changes in the cold start are best. Big changes get you flooded.
Not sure if this helps, or is even on topic.
Mike
1984 Volvo 242 16v, getrag 5speed.
msns-e running toothed decoder and wasted spark with 4 Toyota COP's
42lb/hr cfi's
purrs like a kitten.
http://www.msruns.com/viewtopic.php?t=22411
msns-e running toothed decoder and wasted spark with 4 Toyota COP's
42lb/hr cfi's
purrs like a kitten.
http://www.msruns.com/viewtopic.php?t=22411
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Mike_Robert
- MegaSquirt Guru
- Posts: 84
- Joined: Fri Apr 09, 2004 5:55 am
- Location: FL, USA
Re: Initial tune in MS = V8 SBC?
I think that your advice is absolutely on topic and correct. The cold start settings are quite variable from one engine to another, even if they're both SBCs for example. Modifying settings for effect and analyzing the logs is very important in all areas of your maps. It really doesn't take that long to home in on good settings but you do have to be patient. Remember, "perfect" is the enemy of "really good".
-Mike
-Mike
Re: Initial tune in MS = V8 SBC?
Thanks for the input guys, I am just about ready to start the beast up, I'll keep posting as I get dyno numbers and time slips. I can't wait for spring - check out the truck - 414 in SBC twin turbo at www.jametalworks.com Thanks!