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Got the ecu installed tonite. Took her out for a driver without the cams first and the difference is night and day! Then I hooked up the cams to MSS using Rockwoods directions(work excellent) and it feels just as good. I'm pretty sure my 2" exhaust and OBX header are chokin the crap out of it at higher rpm's. I also have that part-throttle hesitation some people have mentioned, so I'm going to work on that tomorrow. Otherwise i give it thumbs up!
Congats! It's always a nice surprise when things go well. Good luck with your hesitation. I have a miss under load at low RPM but it seems to have worked itself out over the last few days. Also, it's taking a while for the ECu to figure out the idle. But it is gradually improving.
Got the ecu installed tonite. Took her out for a driver without the cams first and the difference is night and day! Then I hooked up the cams to MSS using Rockwoods directions(work excellent) and it feels just as good. I'm pretty sure my 2" exhaust and OBX header are chokin the crap out of it at higher rpm's. I also have that part-throttle hesitation some people have mentioned, so I'm going to work on that tomorrow. Otherwise i give it thumbs up!
When are you getting the part throttle hesitation? Mine does that below 2500 all the time, and it is relly bad when the car is cold.
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1996 200SX SE-R VE powered
1991 Sentra SE-R
2004 Subaru Forester turbo
2006 Mitsubishi Evolution IX
When are you getting the part throttle hesitation? Mine does that below 2500 all the time, and it is relly bad when the car is cold.
Yep, I'm having the same problem as you. Its was pretty bad this morning. and once it warms up it still has a slight hitch there but its alot better. Funny thing is that my DE ecu didn't do this. I searched on the problem but there doesn't seem to be an answer.
I found out this is typical for a JWT ECU with bigger injectors. I ran the DE ECU with my VE for a few weeks while waiting for the new program. The DE ECU didn't do this at all. I watched the timing with the nProbe, and the timing dropped from being in the 20s, to 5deg or lower, then jumped back to the 20s or 30s. If you increase the throttle at this point, the bucking goes away. If I'm just cruising around, and the rpms drop below 2500, there is a "dead spot" between 2000 and 2500. The timing does a similar drop, but not as bad. I can also feel this dead spot when starting out from a stop. I have SR16 cams, so off the line power should feel better. My '91 feels better off the line than my VE does.
Eric, can you describe in detail what your are doing when you preformed the above test (the one where you saw timing pulled to 5 degrees then jump back)? Are you driving at part throttle then mashing the gas? Doing the same thing with the stock ecu, how much timing does it pull?
I really wish the VE was in your B13.
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All posts by Calum in this thread are copyrighted by Calum, and cannot be edited, deleted, or copied without his express permission. calum@calumsult.com
Eric, can you describe in detail what your are doing when you preformed the above test (the one where you saw timing pulled to 5 degrees then jump back)? Are you driving at part throttle then mashing the gas? Doing the same thing with the stock ecu, how much timing does it pull?
I really wish the VE was in your B13.
I'm at part throttle. If you mash the gas, the hesitation goes away. I think I have the log files that show the timing, TPS voltage, and coolant temps. I'll email them to you.
I'm at part throttle. If you mash the gas, the hesitation goes away. I think I have the log files that show the timing, TPS voltage, and coolant temps. I'll email them to you.
Yep, exactly what happens to me. I took the car for a "spirited" drive today and I have noticed the hesitation with a warm engine has improved. I hate the "cold hesitation" because I literally have to rev the engine beyond 2500-3000 to keep the engine from falling on its face.
I'm at part throttle. If you mash the gas, the hesitation goes away. I think I have the log files that show the timing, TPS voltage, and coolant temps. I'll email them to you.
Yep. Same thing here. Part throttle cold...does it everytime. Floor it and it goes away but that is not good to do on a cold engine so you just deal with it until it warms up.
I also just recently swapped ecu's and I have the same hesitiation with both ecu/inj. set up. Mine is a little less noticable w/jwt ecu, but not by much.
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b13-sr20ve
I'm one crazy mo-fo, I had to buss a cop *** he wouldn't give me my props in Oak-town.
It seems that we are all in the same boat with the jwt ecu...mines does the hesitation too.
I need to warm the car to go out not like the DE just warm it like 30secs to 1 min and it keep going fine..the VE runs crappy cold...but the hesitation once its starting to warm its not that bad...but oh well been 1 year now like that im used to it...just start the car 4-5 mins before going out
