My JWT ECU will be here later this week, but my Variable Intake Manifold is not here yet. I'll be heading to the track on Friday or Saturday.

I just wanted people's opinions on running my JWT ECU with 7000rpm redline all the way out to redline in 1st gear. I currently run my car to redline in 1st.

Do you think the short gearing of 1st would make running to redline beneficial or not?

BTW this won't be an issue in a week or so, as I'll have my VI then too and I'll be redlining every gear until my 131K mile valvetrain can take no more


On the same topic... has anyone been able to QUANTIFY the tachometer lag in each gear. Supposedly tachometer readings lag behind actual engine speeds under hard acceleration. Knowing just how much our tach lags could be very beneficial in determining exactly when to shift.

I would say it would be beneficial as long as you get the MEVI! the engine can handle it no problem and with the VI you actually will have power up there

let us know how it goes!

Personally I think without a VI you'll be wasting your time and putting extra wear on your engine. Shifting at 7k would put you well above our torque peak when you start the next gear. Also knowing that the factory tach is off (I know because of my shiftlight) I wouldn't want to be running to 7k all that much. We have good engines, but without internals and depending on your engine condition I'd be afraid of floating valves and causing other internal damage. The fuel cut is there for a reason :/
-hype

ive reved my motor to 7500rpm before. no floaty valves yet but doesnt feel powerful at that rpm but love hearing the motor scream...hehe

I don't know if the tach has any lag as opposed to a continous offset.

When I dyno'd my car a few times, the tach would read about a 200RPM too low at the top of the range as compared to the RPM readings off the dynojet.

Just run the variable intake and go to 6500RPMs.
The damage risk isn't worth it to gain that extra .1 second.
Now if you are a pro with sponsors who will replace your broken parts for free, then do as you please.

- Even with the JWT electronics and the VI, I don't think that you're going to make all that much power up there. The VI prolongs the torque up high, but it doesn't exactly MAKE much more overall power.
- If you're planning on hitting 13's in an n/a Maxima, I really think that you're going to need a well-done port & polish job on your heads, some better cams, and some valve work. I just don't see how else you could hit 13's without MAKING power (as opposed to prolonging power) up high.

- Anybody else agree?

no because theblue has run a 14.2 without a jwt ecu and vi....... Personally, I think without shifting any higher you can definately break without problems.

At redline, this combo will be putting down between 30 and 40 more HP than the stock ECU and intake manifold, judging by the VI dyno graphs I've seen. Just because it doesn't increase PEAK power much doesn't mean anything. It will substantially increase the area under the curve, and allow me to run each gear out to redline. Take a look at Mr. Cranman's dyno plots and you will see what I'm talking about. 13s with this combo will happen, mark my words

I must say after following your plans and looking at the other charts i think this IS going to happen. Your tenacity will pay off... and the title "First N/A 13second maxima" SWEEEEEEEEEEEEEEEEEEEET!

Keep us updated!

With the VI your going to have to shift way into the redline. Cartest shows 7000rpm 1-2, 6900rpm 2-3, 6800rpm 3-4. I used Cranmans dyno with a race weight of 3050lbs, and with a 60ft of 1.94' it ran a 14.2 @ 98mph. You probably can't do it on street tires, so your going to need slicks or DRs at least. However with the ECU your torque should be in the 197-206wtq range. I gave a typical I/Y/E/ECU car the same gains at 5000rpm+ as the VI does. That simulation yeilded 200whp@6000rm/206wtq@4500 vs 186whp/206wtq without the VI. With a 1.94 60ft it ran a 13.8 @ 98mph with a 3050lb race weight. Basically you are going to need a sub 2.0 60' to hit a high 13. Good luck.


Cartest ownz j00!

The VI adds a significant amount of torque after 5000rpm. The VI + ECU on a bolt on max like his could hit a 13.9. However he would need a 1.9x 60ft to do it. With special cams it would make even more power earlier and pull just as hard. Hmm can you say mid 13s NA with slicks + weigh reduction .

With a sub-2.0 60' time I'd be running 13s right now.. with intake and Y-pipe only. If I'm only trapping at 98mph with this combo I'm going to shoot myself. I've always trusted the CarTest software... but its wrong here...

make some videos

I've hit 97mph on numerous occasions with my highest trap being 97.79mph and this is at 1100' above sea level. I don't pull out my seats and I run on 16" rims. I don't have a VI nor an ECU and I'm making 183fwhp and 193fwtq. Most of my 60 foots are in the high 2.2s and low 2.3s and the only thing holding me back from lower 14s is traction. I have no doubt, under the right conditions, Neal will pull off 13s at close to 100mph. CarTest is a good program for general tuning and guestimation, but it can't account for everything. On the same day, my car do some really weird things like post slower 1/8ths and end up running a best for the day. Simply put, there are too many variables to account for at the track.

I can't wait to go 100mph at the track and pop the hood and trunk for everyone to see....NO NOS and NO SC.


Dave

What is VI?? and also, does anyone make a better ECU for a 99 5 speed?

Ben

The VI (Variable Intake) gives a small HP gain, but more importantly extends usable power all the way to redline and beyond. Do a search on Variable Intake and you will find tons of info. There is no ECU for 98+ Maximas.

Actually I found why the trapspeed wasn't higher. I had the shift points set to optimum and it did the 3-4 shift at 6500rpm . So I set the 3-4 shift for 6900rpm and boom there goes our 100mph trapspeeds. Also I remember Neal posting that his car weighed around 2950-2980lbs with him in it. So I changed the race weight from 3050lbs to 2975lbs and the 3-4 from 6600rpm to 6900rpm. A 2.27 60' would net a 14.1 @ 100.7. A 2.04 60' would get a 13.9 @ 101. Hmmm @ 7000rpm 3rd gear goes to 105mph.

I'm curious, does cartest have the ability to change the shape of the power curves it uses to calculate times? Meaning does it have the ability to fatten the midrange, like my JWT ECU will do, and keep the power holding on til 7000rpms, like my VI will do, or does it just utilize peak hp and tq figures, weight and gearing to calculate times? Also does it have the ability to calculate times based on different shifting techniques. I let off the gas during the 1-2 shift because I get too much wheelspin if I don't, but not the 2-3 or 3-4 shift.

BTW my race weight is 2920lbs, assuming I have 1/4 tank of gas and have removed my passenger seat and rear bench, and all the crap in the trunk.