Rich? That's lean, right? Hence, fuel cut.

Is the huge spike at the end what you are looking at?

 

All right! Thanks! So I don't really feel like I wasted my money...
right? What do you think an extra 5hp or so with a AFC?

Paul:
Where did you wire your RPM switch? to the Tach, coil or ECU? I don't think my VI is opening in all gears.
Thanks.

 

WOW !!! COWABUNGA !! THIS IS AWESOME!!

Hey Paul I cant believe you made that much HP !! This is a new chapter in Maxima history. The strongest N/A 4th gen in this side of earth now resides in Maryland. Paul deserves every HP he got, since he is such a nice guy

And as for the catback, I really did feel a nice improvement with my RT cat, warpspeed B and HKS muffler. I take pride in my butt dyno. Its pretty accurate. Why dont you just get a bpipe paul. With the amount of HP you're making, I think you can really get like 5 more with a bpipe.

The nice power gain I got with my catback might have been because my stock cat (with 130k miles) might have been clogged, but one sure thing is that Bpipe really does work good, as Dave B and many others proved on the track. But I'm sure you are basking in satisfaction right now and dont have any urgency for a bpipe.

Cant wait til the track opens.

 

I wish I could get an ECU Upgrade

 

The dip seems to be associated with the MEVI switch over, perhaps turbulance and the MAF gets screwey.

I would like to data log your car with the JWT ECU and stock ECU, I have the pocket logger thing on my PDA, if you have some please!

 

I already did hehe. I took Jeff K's old dyno with I/Y/E/ECU and just added the difference in torque that the MEVI adds. Know what my results were 194whp @ 6000rpm and 193wtq @ 4700rpm. Also cartest says the car should trap around 99mph after the ECU and around ~95mph with stock ECU. Basically there is a 3 tenth and 3mph difference with the ECU vs without.

 

3mph

 

I pulled 140 @7k in 3rd (Auto) at the Dyno that day. I didn't realize it would go that far in 3rd. Thanks JWT!..

 

Yeah. I was there to witness Paul's dyno runs. Just impressive! His motor pulled to redline as easy as if it was coasting at 55. So sweet. Seeing his tach at 140+ in 4th gear was nuts. I was really amazed.

Time for me to pick up a JWT ECU so I can get the extended redline.

Paul, I probably will not catch your HP/TQ numbers but I'll give you a good run

I'd be curious to see what your avg HP is for the stock ECU vs the JWT for the RPM range in your dyno. Maybe if you call Mo at the shop he can pull those numbers up for you.

 

WoW very impresssive # for the N/A motor.Did anyone have any dyno with VI/I/Y/UP/2K exh/JW ECU for an auto.Cause that's what i am running minus JW ecu.Just to see if the ecu help any in the auto.Thanx!

 

I'm still going say that a 5300rpm switchover is probably best for the MEVI. At the track on Sunday, I changed my switchover from 5000rpms to 5300rpms and my times improved. I studied my dynoplots and it's clear that the MEVI is making the same power as the USIM once 4900rpms come around. Then at the switchover at 5000rpms, the power dropped due to the resonance change and didn't come back alive until 5400rpms. I think the MEVI would flow just like the USIM from 4900-5400rpms, without the switchover engaged. By delaying the switchover, the dip in power should be reduced. Unfortunately I didn't try this, but Mardigras did and his plots show 5300-5400rpms as the best point.


Dave

 

Did Mardigras plots show the A/F graph?

I agree 5K looks to be too early, but until I see a higher switchover dyno, I don't know for sure.

 

Would the switchover point be different between auto and manual? Would gearing make a difference?

 

Nope, the optimal switchover point is solely dictated by the torque curve of the engine. Doesn't matter what gear or what tranny type, the optimal switchover point will always be the same on a particular motor.

 

Very nice numbers. And a clean sharp car. Def one of my favorite 4th gens now. I hope I'll get back to the max soon as it still has a good bit of tuning needed.

 

in case anyone wants to see...here is the video of the dyno run.

http://filebox.vt.edu/users/akrug/Dyno/Requin6dyno1.wmv

right click and save.

 

Cool video I tried to listen, but I can't hear your MEVI opening. When I dynoed my Maxima, the switchover was really loud and everyone's eyes opened wide with they heard it.


Dave

 

thats funny that you mention that Dave. in another run, with the VI engaged the whole time...once it hit 5k or so it looked like a nitrous hit and the rpms and sound jumped. but with it activating correctly the sound doesnt change pitch all that much.

i am wondering if it has anything to do with the JWT ECU. maybe since there isnt a dramatic change in power it isnt as noticable. maybe when you get yours you could chime in...since i dont know how the VI is without the JWT ECU.

--Paul

 

Is there any way to change switching times on 03 VI or can I???

Thanks

 

Factory setting should be optimal, unless cams or head work are introduced to the equation.

 

they are....

 

Didn't quite understand that? Cams/headwork are introduced, or the stock settings are optimal? Either way you need to go to a dyno and do a run with the secondary runners open/primaries closed from start to redline, and then perform another run vice versa. And where the 2 cross is where you should set the switchover. I have no clue how to do it on a 5th gen though. With the 5th gens, I think it is a lot more comlicated than with the 4th gens b/c the program is in the ECU, not just an rpm switch.

 

thanks...for info....

 

Wow. Very impressive!

 

Thats fuel cut from the ECU causing the indication of the rapid lean out condition.