Hello,
I’m posting my issue here, hoping to find some help.
(Sorry, English is not my first language and noob with s300.)
Set-up:
• Basemap: JDM P30 (92-95 B16A Civic)
• Fuel: E85
• EJ9 1999 → swap B16A2 (1998)
• ECU: P28 + S300
• Injectors: RC 550cc
• High-flow fuel rail + pump + Regulator (fuel pressure @ 40 psi) AEM
Engine:
• ITR camshafts
• Wiseco pistons
• Eagle rods
• Supertech valves
• ITR valve springs
• Supertech retainers
• DragonFire distributor (new)
Problem:
The engine feels like it’s hitting the rev limiter before 8000 RPM, it won’t rev any higher.
According to the logs, the cut happens between 7500 and 8000 RPM.
I’ve attached two logs .
(I know the AFR is not ideal, but I want to fix this “rev limiter” issue before going to the dyno.)
Thanks a lot for your help!
RevLimiter? Ignition? Other?
RevLimiter? Ignition? Other?
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Re: RevLimiter? Ignition? Other?
Note: the issue is quite noticeable between frames 203 and 210 in the file "1.s3d".
Re: RevLimiter? Ignition? Other?
The first thing to check is at the Rev Limits, make sure activation rpm , is @ late (further left) and power reduction to none. (Have the same settings for the past 3-4 years) , no issues, but I have also experienced what you say.
Safety wise for me it was all good with stock distributor (many years) and COP from doctronic , so you should not have any issues!
Safety wise for me it was all good with stock distributor (many years) and COP from doctronic , so you should not have any issues!
Re: RevLimiter? Ignition? Other?
I have the same issue with both the original distributor and a rebuilt original distributor, which is why I switched to a brand new Dragon Fire.
In the logs, there is no active Rev Limiter or soft limiter.
The only parameters that have been modified compared to the P30 basemap are the deactivation of the Knock Sensor, the deactivation of O2 heating, and the injection table to achieve something more accurate (this will be finalized on the dyno after resolving this issue).
The Rev Limiter @ 8450 in SManager.
In the logs, there is no active Rev Limiter or soft limiter.
The only parameters that have been modified compared to the P30 basemap are the deactivation of the Knock Sensor, the deactivation of O2 heating, and the injection table to achieve something more accurate (this will be finalized on the dyno after resolving this issue).
The Rev Limiter @ 8450 in SManager.
Re: RevLimiter? Ignition? Other?
Without the calibration we can't really tell what is going wrong. So the early activation (will be 200rpm aprox) , so we can rule out that possibility cause you are 500~ rpm less than that.
Make sure you don't have any protection enabled.
1) Also check your timing map -> too much adv , it will feel slugish and won't allow you to rev.
2) Are you using your stock intake/exhaust manifold?
3) DId you use a timing light to sync the ecu with the actual timing that the engine sees? In hondata -> Online -> Set Timing.. (That should keep it at 16deg) and make sure that the distributor with timing light is set at 16 deg as well.
Also please tell us if the cut that you experiencing is hard cut = ignition cut (sudden, aggressive) or soft cut = fuel cut (smoother, gradual)
I can see it in the datalog (1.) it seems sudden.
Also post your calibration , maybe we are missing something there.
Make sure you don't have any protection enabled.
1) Also check your timing map -> too much adv , it will feel slugish and won't allow you to rev.
2) Are you using your stock intake/exhaust manifold?
3) DId you use a timing light to sync the ecu with the actual timing that the engine sees? In hondata -> Online -> Set Timing.. (That should keep it at 16deg) and make sure that the distributor with timing light is set at 16 deg as well.
Also please tell us if the cut that you experiencing is hard cut = ignition cut (sudden, aggressive) or soft cut = fuel cut (smoother, gradual)
I can see it in the datalog (1.) it seems sudden.
Also post your calibration , maybe we are missing something there.
Re: RevLimiter? Ignition? Other?
@LittleH
Here’s an update: I was able to reach 8500 rpm.
I’m attaching the logs as well as my calibration file.
In the log, you can see two ignition timing spikes up to 45° around 7700 rpm.
The cuts feel like a hard cut — it’s not progressive. You can clearly see the sudden RPM drops in the logs.
I also forgot to list my intake/exhaust setup:
INJEN Short Air Intake
Skunk2 throttle body
Skunk2 intake manifold
SRS 4-1 header
Here’s an update: I was able to reach 8500 rpm.
I’m attaching the logs as well as my calibration file.
In the log, you can see two ignition timing spikes up to 45° around 7700 rpm.
The cuts feel like a hard cut — it’s not progressive. You can clearly see the sudden RPM drops in the logs.
I also forgot to list my intake/exhaust setup:
INJEN Short Air Intake
Skunk2 throttle body
Skunk2 intake manifold
SRS 4-1 header
You do not have the required permissions to view the files attached to this post.
Re: RevLimiter? Ignition? Other?
Well , that 45 degrees of adv is a huge problem and one that might cause your engine to blow-up.. from your calibration it does not have anything out of the ordinary , so I would suggest to check all your plugs (tps/map/etc..) anything you can find make sure its tight and also check to see if any sensor has any play. that should not happen.
Also check your mixture up top to make sure its up to par (with the datalog you provided and calibration) it shows 17.69 and at 8.9k (that is due to rev limiter) fuel cut. but it also shows it @ 929mbar at 8k (same mixture)
So keep an eye on that.
Also 2 things to change in your calibration is in the Rev Limits tab (use activation rpm (late) and power reduction (none or close to none).
Second: In Fuel Trim , I would recommend for you to use Throttle tip in trim -40% (it will work flawlessly)
But Final for your problem.
Check the mixtures go with a friend and do some pulls to make sure its stable at 12.8 @ Wot.
and check all of your hardware (all of connections , wiring , etc..) that 45 degrees can and it will blow up your engine.
Like Honda does after 7k , you need to lower timing in order to help the engine rev. (your map is fine , you can be a bit more aggresive potentially)
But fix those issues first
IF everything with wiring / sensors /connectors looks fine, get your ECU checked out
Also check your mixture up top to make sure its up to par (with the datalog you provided and calibration) it shows 17.69 and at 8.9k (that is due to rev limiter) fuel cut. but it also shows it @ 929mbar at 8k (same mixture)
So keep an eye on that.
Also 2 things to change in your calibration is in the Rev Limits tab (use activation rpm (late) and power reduction (none or close to none).
Second: In Fuel Trim , I would recommend for you to use Throttle tip in trim -40% (it will work flawlessly)
But Final for your problem.
Check the mixtures go with a friend and do some pulls to make sure its stable at 12.8 @ Wot.
and check all of your hardware (all of connections , wiring , etc..) that 45 degrees can and it will blow up your engine.
Like Honda does after 7k , you need to lower timing in order to help the engine rev. (your map is fine , you can be a bit more aggresive potentially)
But fix those issues first
IF everything with wiring / sensors /connectors looks fine, get your ECU checked out