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> Carbs versus FI, I can buy some carbs and stuff but can I buy FI?
Type 47
post Mar 22 2023, 05:06 PM
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Can you just buy a FI setup? Or do you have to resurrect your 50 system that has been in a box for forty years and you know something is wrong with it?
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technicalninja
post Mar 23 2023, 01:21 PM
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Basic tuning of an aftermarket ECU does not require a dyno.

It's far better to educate yourself on tuning and get all of the "run normally" stuff done long before you head to a dyno.

A good dyno tune is for setting AFR and ignition timing for BMT (best mean torque) in a semi-laboratory setting.

Making multiple runs fine tuning AFR and continuing to add timing until either of two things happen.
One-adding additional timing does NOT further increase power. At this point you have achieved BMT and you back the timing up a little bit past where the power maxed out. This is what we WANT to happen.

Two- add timing until the knock sensor starts showing hits. Back timing up a bit from the point that the knock occurs. For my stuff I'd be close to knock limits. For my customer's stuff I'd back it up an additional 3+ degrees to be conservative. This is what we call knock limited power. Adding higher octane fuel is the solution to this problem and 90+% of tuning on pump gas ends this way.
100 octane race gas or E85 usually allows tuning to BMT without knock.

These power tunes HAVE to be done on some kind of torque measuring device but if the basics are not completed by the time you hit the dyno you are just wasting your time.

A simple laptop, properly set up system, and 10+ hours of getting it right are what I do BEFORE I hit a dyno...
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Posts in this topic
Type 47   Carbs versus FI   Mar 22 2023, 05:06 PM
JamesM   Can you just buy a FI setup? Or do you have to r...   Mar 22 2023, 05:35 PM
r_towle   There are quite a few packaged kits available now....   Mar 22 2023, 06:17 PM
914werke   imo by the time you buy carbs & associated bit...   Mar 22 2023, 06:22 PM
Type 47   imo by the time you buy carbs & associated bi...   Mar 22 2023, 06:46 PM
GregAmy   Of course something in the box is bad or the PO w...   Mar 22 2023, 07:01 PM
Type 47   Of course something in the box is bad or the PO ...   Mar 22 2023, 07:19 PM
bossboy302   [quote name='914werke' post='3067019' date='Mar 2...   Mar 23 2023, 10:06 AM
mihai914   Not sure if you're asking about a stock system...   Mar 22 2023, 06:23 PM
Type 47   Not sure if you're asking about a stock syste...   Mar 22 2023, 07:28 PM
bkrantz   Not sure if you're asking about a stock syste...   Mar 22 2023, 08:25 PM
mepstein   Eric at PMB Performance has developed a modern FI ...   Mar 22 2023, 06:29 PM
BeatNavy   You'll learn a lot about how an engine operate...   Mar 22 2023, 06:57 PM
brant   You can bench test all of the djet components indi...   Mar 22 2023, 07:07 PM
emerygt350   I definitely like djet but it really is limited an...   Mar 22 2023, 07:08 PM
Superhawk996   Can you just buy a FI setup? Or do you have to r...   Mar 22 2023, 07:20 PM
Type 47   Can you just buy a FI setup? Or do you have to ...   Mar 22 2023, 07:36 PM
Superhawk996   There is a lot to learn if you’ve never done it ...   Mar 22 2023, 07:47 PM
Type 47   There is a lot to learn if you’ve never done it...   Mar 23 2023, 05:48 PM
Superhawk996   We are hitting pause for a few days, good advise...   Mar 23 2023, 08:27 PM
gnomefabtech   Any modern aftermarket ECU will be leaps and bound...   Mar 22 2023, 09:26 PM
GregAmy   A megasquirt or whatever will run great using the...   Mar 23 2023, 05:58 AM
gnomefabtech   A megasquirt or whatever will run great using the...   Mar 23 2023, 09:29 AM
GeorgeKopf   I have been looking at the SDS EM-5. http://www.s...   Mar 22 2023, 09:45 PM
r_towle   Have you considered getting a base tune setup for ...   Mar 22 2023, 09:49 PM
Type 47   Have you considered getting a base tune setup for...   Mar 23 2023, 06:11 PM
partsguy22   Clay Said I should mention our efforts towards thi...   Mar 23 2023, 08:41 AM
NARP74   Clay Said I should mention our efforts towards th...   Mar 23 2023, 09:57 AM
ClayPerrine   Clay Said I should mention our efforts towards t...   Mar 23 2023, 12:01 PM
gnomefabtech   Clay Said I should mention our efforts towards th...   Mar 23 2023, 11:55 AM
technicalninja   Basic tuning of an aftermarket ECU does not requir...   Mar 23 2023, 01:21 PM
partsguy22   I thought I had more pictures of the project after...   Mar 23 2023, 02:09 PM


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