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My rev limit is cutting in at 6500 rpms does any one one here knoe why?
I have a 1999 Prelude with a VFAC and it has no settings ohter than the ones ou need to initalize it!

 
Rep Power: 316

u should be happy getting it at 6500 rpm
cuz everyone here is getting cut off at 4000 rpms


the problem is being worked on
and the ppl who knoe how to fix it won't tell anyone

just chill until apex releases some news

 
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6500rpm rev limiter must be nice...

 
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.... I hit rev limiter at 6.7 or 6.75... 01 dx coupe

 
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i've gotten to 7.2 on my LX coupe

 
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7.2 here as well on my 02 LX 2dr

 
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Ill try again in the day to see the limit.. tomorrow

 
Rep Power: 353

u must have a auto or something is wrong cuzz our cut off is 7.2

i have a 2k2 4d lx 5speed

 
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7200 here on my 02 EX

 
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same here...01 LX

 
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if you really hit it hard you can even get past it ... 01 LX

 
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just like everyone else 7.2 in ex auto

 
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yep, me 2

 
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VFAC!!! People he is talking about how it only goes up to 4000 rpms (when its cool I believe).

 
Rep Power: 353

ok people it's V-AFC! and if ur V-AFC is cutting u off at 6500 or 4000 rpm then u need to reset it or get it tuned. and there is a fix for the V-AFC for the 2k vic so it will work corectly. use the search button

 
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Do you mean re-initialize it and see what happens! Thats what I did and it went to 6500 before that it was fine! Whats the deal witht he check engine light comming on and on the pre lude the ATTS light comes on too! Is the V-AFC really worth the time and agravation to have? Is there anyone out there who has some in put that is helpfull?

 
Rep Power: 353

yes it very much worth it especially if u have a h22. u need to take it to a shop that knows how to tune it they probly can fix ur problem. dont mess with it ur self, if u dont know what ur doing cuzz it will **** ur iish up. another place u may want to check out is www.honda-tech.com there b and h series masters over there.

 
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explain what the V-AFC does, im not really sure .... i would think if it cuts your redline to below the torque peek that you really wouldnt want to have it

 
Rep Power: 353

here ya go stright from apex they can explain it better than i can

Monitor Mode: Allows monitoring of up to 4 channels at one time. Also allows tracing of AVC-R monitor functions.

Setting Mode: Allows user to adjust air/fuel ratio through Wide and Narrow Throttle maps. Other features like throttle percentage settings, rpm point settings, VTEC engagement/disengagement are adjustable through the setting menu.

Etc. Mode: The etcetera menu is for adjusting the variables that are required for the V-AFC to properly adjust fuel(i.e. # of cylinders, throttle position sensor type, sensor type, etc.)



Up to four data channels can be selected for monitoring:

Intake Pressure
Throttle Position
Engine RPM
Air Correction Rate
ECU VTEC Solenoid output
V-AFC VTEC Solenoid output


Up to four of these parameters can be monitored in three different ways:

Numerical
Analog Meter
Graph Display



If monitored numerically, by pressing the up key the user can see a peak hold value for the chosen parameter.
If monitored in analog meter mode, up to two meters can be displayed at one time. By pressing the up key, the analog meters will hold the peak value. If under 3 or 4 channel mode, only the first two channels will be displayed.
If monitored in graphic display mode, by pressing the up key the AVC-R can start "sampling" or memorizing data channels. The memorized graph can then be replayed by pressing the right key. Anytime during replay by pressing the right key again, the display can be paused. To review any part of the memorized graph, the user can push the left key during replaying. Anytime during backwards replay, the left key can be pressed to pause the display.
If monitoring one channel, then the last 60 seconds can be replayed.
If monitoring two channels, then the last 30 seconds can be replayed.
If monitoring three channels, then the last 20 seconds can be replayed.
If monitoring four channels, then the last 15 seconds can be replayed.




Up to five parameters can be monitored, but only one at a time:

Intake Pressure
Throttle Position
Air Correction Rate

The 2D Trace Mode displays one user-selected parameter versus engine RPM. The horizontal scale being engine RPM and the vertical scale being the user-selected parameter. There are three ways to view the 2D Trace. One way is a simple cursor that floats around the screen showing what the user-selected value is. The second way to view the graph is with a 10 point floating trail to show the trend of the user-selected value. The third way is to view with a "Ghost Map" trace. The "Ghost Map" shows wherever the cursor has been and does not clear until the user clears the screen.




Both the Wide and Narrow Throttle setting maps are used for adding or subtracting fuel throughout the fuel curve. This unit takes the input pressure signal and converts this signal into absolute pressure. The modified output signal value is then converted back into a pressure signal and sent to the ECU. The Wide and Narrow Throttle setting maps can be adjusted at 16 different RPM points with 8 each on the Hi cam and Lo cam. Within each selection, Wide and Narrow, are two maps. One map is for the Lo cam and the other map for the Hi cam. This means that there are a total of 4 maps between the Wide and Narrow selections (Narrow-Lo, Narrow-Hi, Wide-Lo, Wide-Hi).

The range of fuel adjustment is +/- 50% which can be done in 1% increments. However, varying upon application, when using a stock ECU there is a limit before the check engine light will turn on. When it does turn on, this means that the ECU thinks that there is boost entering the engine and the ECU will go into a limp mode. Generally, this is in the 12-15% additional fuel range. Keep in mind that the V-AFC modifies the factory pressure sensor's signal so when a user tries to add too much fuel, the pressure sensor voltage will go too high and the ECU will think there is boost entering the engine.

When looking at the map, the vertical dotted line represents the VTEC engagement point. Fuel settings to the left side of the dotted line for Hi cam, and right side of the dotted line for the Lo cam, will have no effect on fuel correction. During tuning, the Wide Throttle map should be set first and then the Narrow Throttle map. All values between the predetermined RPM points will be interpolated. Only a professional using engine monitoring equipment should be tuning the V-AFC.




This is the screen used to adjust the VTEC engagement point. A tuner can adjust the RPM point at which the engine switches from the Lo to Hi cam during acceleration as well as when the engine switches from the Hi to Lo cam during deceleration. However, the Hi to Lo (deceleration) rpm setting cannot be set higher than the Lo to Hi (acceleration) setting and the Lo to Hi (acceleration) rpm setting cannot be set lower than the hi to Lo (deceleration) setting. The adjustment range is between 3000 - 7000 rpm in 100 rpm increments.




This function performs correction for when the ECU and the V-AFC V-TEC engagement points differ. For example, if the V-AFC's V-TEC engagement point is set to 5000 rpm and the ECU's engagement point is set to 5500 rpm, then the VTEC Unmatched Fuel Correction setting will occur during this 500 rpm difference (between 5000 and 5500). Technically the fuel correction can be tuned with just the wide and narrow maps, but the use of this feature allows easier and finer tune ability. Whatever values entered into this setting will be added to the corrections in the wide and narrow maps.




On this screen there are two values, Lo and Hi. Each value determines whether the Narr.-Thr or Wide-Thr map will be used by the V-AFC for correction. If the Lo value is at 10% and the Hi value is at 50%, then the settings on the Narr.-Thr map will occur between 0 and 10% throttle position and the settings on the Wide-Thr map will occur between 50 and 100%. If the throttle is between 10 and 50%, then the V-AFC will interpolate between the two values set on the Narr.-Thr and Wide-Thr maps.

The Wide-Thr value should be set at the point where air/fuel ratio no longer changes with an increase in throttle angle. For example, if at 65% throttle the air/fuel ratio is at 10.5:1 and at 100% the air/fuel ratio is 10.5:1, but at 55% throttle angle the air/fuel ratio is 10.9:1 then the setting for Wide-Thr should be 65% (the point where air/fuel ratios no longer vary according to throttle angle).




This menu allows adjustment of engine RPM points to control fuel while the engine is on the Hi cam. The user can define eight points between 3000 and 9000 rpm in 100-rpm increments. These eight points will appear on the Hi cam maps in both Narrow and Wide setting screens.




This menu allows adjustment of engine RPM points to control fuel while the engine is on the Lo cam. The user can define eight points between 1000 and 7000 rpm in 100-rpm increments. These eight points will appear on the Lo cam maps in both Narrow and Wide setting screens. models will be set to 06 IN and 06 OUT




This menu allows the user to select which type of sensor the V-AFC will be correcting. All Honda models will be set to 06 IN and 06 OUT




This mode allows the setting of the maximum and minimum values to be displayed under the Monitor Mode's graph display mode, analog meter mode, and 2D Trace mode. The user can select the following scales:

Pr: Intake Pressure -760mmHg~0mmHg
-760mmHg~+1.0kg/cm2
-760mmHg~+2.0kg/cm2
Ne: Engine RPM 0rpm~6000rpm
0rpm~7000rpm
0rpm~8000rpm
0rpm~9000rpm
0rpm~10000rpm
Cr: Air Flow % Correction +/- 3%
+/- 6%
+/- 9%
+/- 15%
+/- 30%




This mode will check the voltage of the pressure sensor, throttle position sensor, and light sensor voltage (inside of the V-AFC). This function is to check if all connections have been properly connected after installation. Also if there is improper operation, this screen can be viewed to determine if any connections or sensors are bad.




This mode allows brightness adjustment of the VFD (Vacuum Florescent Display). Day = daytime, Dim = sunset, Nig = night.




This will restore all data to factory default settings. All previously saved data will be lost. To initialize data, select YES and push the [NEXT] key. Then turn the ignition switch OFF and then ON again. All data will be initialized and all settings will be returned to default.

 
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so if i understand right its just like a monitoring thing?

 
Rep Power: 353

that's one part of it. it also lets u tune the ecu settings, so u can get the most out of ur car, and mods.

 
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ahh i gotcha ... so its jus ta flow or soemthing that it doesnt let you get the max rpm? In that case wouldn't you want to just take it off until they come out with a fix for it

 
Rep Power: 353

well sceen its a 99 lude. there is no need for a fix. it just needs to get tuned correctly, so it dosent cut off his rpm's. or there's something wrong with his v-afc that's not working correctly.

 
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ah, and most performance shops would be able to figure it out .. you just need to take the time to go up there

 
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I think there is a fix for the ludes as well. I remeber being on another forum and this happened to another guy. Apexi didn't include something in the instructions for the install or something...Do a google search and maybe you can find it. Good Luck

 
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Does anyone know the rev limit on an Auto? without V-AFC?? Mine is 5K in park/neutral... is that correct?

 
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Damn.. I redlined the hell out of it in 2nd or 3rd gear and it went.. booooo... right at 6.7 .... damn you people and your .5 more.. that's a 1/8 of a car length for me usually... around here anyway..

 
Rep Power: 333

for real? Mine is 7000. (02 ex 5sp)