Hondata

I have been troubleshooting this issue for almost two weeks now:

I had my car on the Dyno twice and had no issues with the Hondata what so ever. As soon as I left the shop I started getting a boost cut. I have swapped out and tried different Hondata ECU's with the same tune, changed plugs, wires, rotor, cap. I have no CEL's or error codes and everything worked perfectly fine on the dyno. It cuts out the motor as soon as I put the car into boost, literally once it passes 0 PSI regardless of the RPM's. I have been working with the tuner and we cannot figure it out. Over a two three week period we had the car on the dyno twice, for well over an hour and had no issues going full boost to red line. This is the same tune that we used and I have not changed any settings. The tuning is done and I can't even enjoy the car. Any ideas on this issue would be extremely helpful. Thanks,

Jon

Post your calibration file and a datalog of the issue occuring.

I will post both as soon as I get home tonight.

After looking over your datalog it looks to be the only thing that is out of place is that you give the car some throttle after boosting and the rpms do not raise is that correct or am i missing something. Also were you moving durring this test or not because your VSS shows a steady 4mph the whole time.

*Also, just as a note I had an issue with my speedometer cable and it has since been replaced. It did not have an effect on the problem at all before or after. However, it is replaced and working now and I having the same issue as described. The particular datalog above was taken when the cable was faulty and hence the 4 mph.

The problem is that as soon as I go into boost I hit a brick wall. The boost will still go to the set amount and I can see it on the boost gauge but the motor will cut out until I let off the gas to bring the car back into vacuum. It seems to be the Hondata cutting out the motor since it literally happens as soon as the car see any positive pressure and seems to be very precise.

Can you give me some details about your setup like motor turbo injectors boost control method ect. also do you have a wideband installed because Im not getting anything for a reading when i review your datalog.

Sure. B18a1 Built Motor, Turbo XS MBC set to 12psi, T25, 255 Pump, 450cc injectors. I do not have a wideband installed. However, I have a brand new o2 in my DP, the same one that was used for the tune. Should a lamba be showing on the datalog? I believe it is set to closed loop as I cannot check the tune right now (at work).

I see that it says zero on my spreadsheet version of the datalog. The problem started as soon as I left the tuner and we had no problems on the dyno. Let me know what other info you might need. Thanks for the help.

So If im reading this right you guys used a narrow band o2 sensor to tune the car, That in and of its self is a problem narrow band sensors are super inaccurate. Also try to take the boost controller out and see if it still has this problem I have experienced an issue with MBC's before where they hold the wastegate open after initially hitting boost because they cant bleed off the pressure correctly which would inturn make your car run very strangely.

I understand what you are saying about the MBC but it seems to be holding the boost without any problems so I don't think that is it. Wherever it is set to it holds boost correctly. We also did not have any problems with the same MBC setup on the dyno on two separate days. I also used this MBC previously on my old setup at 7 psi and never had any issues.


If you are driving the car at partial throttle and keeping the car within vacuum it drives fine regardless of rpm's etc. Literally as soon as the MAP/gauge sees positive pressure it cuts the motor out. If you hold your foot on the gas at full throttle (full boost after a few seconds ), you hear the engine going blup blup blup and you can look at the gauge and still see the correct amount of boost pressure holding. Due the accuracy of it cutting at positive pressure it feels like a computer problem.

I would seriously get a wideband or borrow someones or go back to where the dyno is and have them run a pull with their sniffer to get an accurate a/f plot. Other than that im not sure what else to tell you your map is very scattered though and its going to make it hard for the computer to interpolate the values between the cells I would hav another tuner look at it and see what they think.

So you are thinking that the tables look odd and the A/F plot is not accurate? I am just trying to understand how you are relating this to the boost cut issue.


Does anyone else have any other ideas? It appears to be a Hondata related issue.


I want to reiterate that I was on Dyno twice on two separate days and had zero issues. Since we rolled the car off the Dyno and I left the premises I have been having this problem from the minute I boosted. I have been working with my tuner via phone and email because A) Paid for what was understood to be a complete tune and B) I do not have the time to take off from work to just go back. He is an extremely reputable tuner and has been working with me on this, but we cannot find the reason for this problem yet. I thought that someone from Hondata provides support on this forum...

Just thought of this but check your plugs to make sure they are not fouled or that the gap has gotten to big. could be blowing out the spark in boost.

Parameters, Boost cut, 'Boost Cut if check engine code' is checked and you have a check engine code for the speed sensor.

surfingsk8r wrote:Just thought of this but check your plugs to make sure they are not fouled or that the gap has gotten to big. could be blowing out the spark in boost.

I mentioned that I changed the plugs, cap and rotor just to be sure and it did not solve the problem. :(

Hondata wrote:Parameters, Boost cut, 'Boost Cut if check engine code' is checked and you have a check engine code for the speed sensor.

I have tested turning off "Boost Cut if check engine code" and it has not had an effect. I mentioned that I fixed the Speed Sensor and I have no CEL's or error codes whatsoever and this issue is still occurring. It feels like what happens when there is a Hondata Boost Cut. I have posted the tune and datalog if you want to take a look.