Do you see most of your low end come back once you add the ECU to the mix ?? I can see the Low-end loss, Slight, since I put the Variable Intake in and Ill be doin the ECU during the summer...

Also, is bringing the engine to 7K bad ?? I know its not completely safe but ?
Maybe nissan made the rev limiter at 6600 because the engine had too much air, and the power loss was too much to let the revs go any higher...maybe with the VI, you can rev past 6600 safe ?

-matt

 

To be honest, I felt the low end loss was pretty slight with the MEVI. I can say that overall, a JWT/MEVI setup is pretty awesome... particularly since you have the 5 speed. You will love it and not look back. The increased redline is very nice, but I am thinking now that the overall gains in hp/tq are equally as good--especially for day-to-day driving.

 

bump

 

Yes, I noticed nearly all my lowend come back with the ECU. Before the ECU, I found myself taking the rpms up to nearly 5000rpms to get any real power. With the ECU, taking it up to 4000rpms feels great and much better than it did prior.

As for revving to 7000rpms, my VQ feels feel happy. I've never noticed any signs of valve float at 6500rpms+, but I nearly take it that high anyways. Taking it to 6000rpms is usually more than plenty unless you're truely racing. The 6500rpm fuel cut was most likely done because the stock valvetrain isn't reliable past about 7200rpms. Nissan probably built in a safety margin to keep the motors reliable for 200K plus. As long as you're not constantly staying above 6500rpms, I don't think you'll have any problems.


Dave

 

I did a comparison chart with me #'s from OEM manifold w/ stock ECU and VI w/ JWT ECU and my torque numbers are still lower even with the JWT. 185.7 ft/lbs. for the OEM combo compared to 181.1 ft/lbs. for the VI/JWT combo.

 

I wonder why ??? Any thaughts ?? any solutions ??

-matt

 

These #'s aren't a COMPLETELY accurate difference. The day I ran the OEM/Stock ECU combo, my intake air temp was 54.6 degrees with a baro pressure of 28.91. The VI/JWT combo was 71.4 degrees with a pressure of 29.73. I'm sure that had some to do with it, though I'm not sure just how much. Almost a 20 degree difference.

 

I'm pretty sure that the stock 6550 rev limit is there because the VQ can not sustain 7K in a top speed cruise. The engine can develop the power to stay there, but the heads/accessories won't be able to hold up for long. Winding out in each gear is not too much of a strain.

DW

 

How much does that combo cost?(MEVI + JWT)and what did yall pay for the installation?

 

About $1200 for both...Definetly a Do-It-Youself job..Im a 19 year old kid that couldnt even change his own oil before I got my max, now Im puttin manifolds on and stuff ...its fun
-matt