Hondata

Got a question that can probably get answered quickly by the right person.

I have a 92 Prelude that I just swapped a H22a4 into with the only modification being Type-S pistons that yield 11:1. I have heard that their are base tunes on this forum but I am unable to locate where. I believe that with a little tweaking I could probably write a base tune for this instead of sending $50-$100 to a tuner to get me moving. I'd like to turn the key on this motor and break it in this weekend. Here is some additional data on my setup:

Vehicle year and model: 1992 Honda Prelude (chassis code BB2)
Engine: H22a4
Engine details: Nippon Type-S pistons (11:1 comp.), balance shaft delete, H23a head (H23a cams)
Fuel: Premium (91+ octane)
Injector Size and Brand: 290 cc/min
Fuel Pump Size: Walbro 255
Turbo or N/A: Naturally aspirated
Exhaust Setup: 1320 tri-Y headers > DNA motoring test pipe (2.50 dia.) > Invidia N1 cat-back exhaust (60mm dia.)
Turbo: N/A
RPM limit desired: 7,400 rpm
Launch control: N/A (cruise control deleted)
CEL shiftlight rpm: 6,400 rpm
O2 enabled/disabled: Enabled, Honda OEM (two-wire)
Additional info: Crankshaft sensor is in the TD40u distributor, not at the oil pump. Radiator fans are on a standalone system. Other changes from this tune to is:
• OEM intake plenum butterflies deleted (port/polished)
• VTEC is now enabled (pressure switch disabled)
• IACV has been plugged from receiving coolant
• Round-style knock sensor (Rywire harness)
• FITV deleted
• EVAP deleted
• EGR deleted
• ABS deleted

Can someone point me in the right direction?

Base maps are in the software, just open a new calibration. Make sure you sync the timing as the ignition map is set up for newer Preludes with fixed timing. So pull timing out of the map.

I would look in the vault.

Open SManager, click the Window menu, and select Vault.

Filter your search with relevant calibration details.

TTR wrote: Tue Dec 07, 2021 8:25 am Base maps are in the software, just open a new calibration. Make sure you sync the timing as the ignition map is set up for newer Preludes with fixed timing. So pull timing out of the map.

I'm doing an H22a4 swap but it will be driven off of an OBD1 system, what parameter is this that you are referring to?

Kampfzentrum wrote: Wed Dec 08, 2021 5:03 am

TTR wrote: Tue Dec 07, 2021 8:25 am Base maps are in the software, just open a new calibration. Make sure you sync the timing as the ignition map is set up for newer Preludes with fixed timing. So pull timing out of the map.

I'm doing an H22a4 swap but it will be driven off of an OBD1 system, what parameter is this that you are referring to?

In SManager, click "New Calibration" in the top left. Scroll down and select h22tuned440.skl - this is a calibration for an H22 engine that was tuned with 440 cc/min injectors. In the parameters menu, select the "Fuel Injectors" tab and change the current injector size from 440 down to 290. Then you can go to the timing maps and pull a few degrees out of the entire map - highlight all the cells, Ctrl+J, and in the middle box (Add to selected values), enter a negative value (-2, -4, etc.) for however many degrees of timing you want to pull out of the entire map. Do this for both high and low cam maps. This should get you a base map you can use to get to the tuner. I would not recommend driving any further than you have to using it before being tuned.

DaX wrote: Wed Dec 08, 2021 6:15 amIn SManager, click "New Calibration" in the top left. Scroll down and select h22tuned440.skl - this is a calibration for an H22 engine that was tuned with 440 cc/min injectors. In the parameters menu, select the "Fuel Injectors" tab and change the current injector size from 440 down to 290. Then you can go to the timing maps and pull a few degrees out of the entire map - highlight all the cells, Ctrl+J, and in the middle box (Add to selected values), enter a negative value (-2, -4, etc.) for however many degrees of timing you want to pull out of the entire map. Do this for both high and low cam maps. This should get you a base map you can use to get to the tuner. I would not recommend driving any further than you have to using it before being tuned.

Sorry if I am coming off as a noob (but I am). I've changed the fuel injectors already, but when you refer to the "timing maps", I assume you are referring to the "Tables" tab, which gives four map tables low/high (VTEC?) speed ignition tables and low/high speed fuel table. You are saying select all low/high speed ignition tables and reduce them by - roughly - -3 degrees?

Yes, when I say timing maps, I mean the "tables" tab. Regarding how much, I'm just a guy on the internet, so take my advice for what it's worth, but yeah, try starting with 3 degrees.