[DTEK]

This may be normal for this engine but I thought I would ask. It seems from a standing takeoff that the engine just seems held back until around 4,000 rpm then it just takes off. The only thing to compare it to is turbo lag without a turbo. Is this just the way the powerband is on this engine or is it something I should look at?

It runs fine and shifts nice but and after first it just accelerates nice. I do not have the big tow or offroad package so maybe it is the higher gearing?

 

[LS1POWERED]

This may be normal for this engine but I thought I would ask. It seems from a standing takeoff that the engine just seems held back until around 4,000 rpm then it just takes off. The only thing to compare it to is turbo lag without a turbo. Is this just the way the powerband is on this engine or is it something I should look at?

It runs fine and shifts nice but and after first it just accelerates nice. I do not have the big tow or offroad package so maybe it is the higher gearing?

Yup, You are just getting closer to your HP peak! That is also around where
your hp and torque curves meet.

 

[DTEK]

Thanks alot. I was just worried because there is alot of raves about the acceleration and I have never heard it mentioned about the lag feeling until the rpms are up. After that though it does scream

 

[ekool]

An aftermarket torque converter would wake that up ALOT....

 

[LS1POWERED]

An aftermarket torque converter would wake that up ALOT....

I dont think they make an aftermarket TC yet. :teethmast

 

[ChuhBaca]

That sounds kinda strange to me. The first Titan I drove was a King Cab XE that was as stripped as the Titan comes. It had the higher gearing in the rearend and jumped right off the line! In fact the chirping tires is what showed me that this truck was different that the previous 4 I had driven.

It could also be your perception. The first truck I drove was the Hemi Ram. I wasn't impressed with it at all, knowing it was supposed to be 345 hp. I drove all the other after and drove another Ram. The second one I drove did feel powerful (although still second to the Titan). So either something was wrong with the first one or after driving the other trucks, I had something to compare it to.

Drive the others too, now that you have had a taste of the Titan. You may begin to feel it more once you have seen what the others do when you step on it.

 

[Don]

If you have a accelleration lag, have it checked because in no way is there a problem with the accelleration in the titan, hell mine knocks anything not tied down to the floor when i romp on her, I traded in a diesel for her because of the turbo lag !!!!!

 

[Sabre66]

No lag in mine either.

 

[DTEK]

Yea I should go test drive some. The first and only test drive I did was in an off-road 2wd and I did not know there was a difference in gearing before I bought mine. Off the start I can burn the tires loose (sometimes) but then it seems to flatten a little (like it is geared too high) then at 4,000 rpm or so it like bucks forward then it is fine through the rest of the gears. Strange power curve to me. I was just wondering if anyone else felt the same before the 4,000 rpm mark or if I was expecting too much

 

[got_titan]

Yea I should go test drive some. The first and only test drive I did was in an off-road 2wd and I did not know there was a difference in gearing before I bought mine. Off the start I can burn the tires loose (sometimes) but then it seems to flatten a little (like it is geared too high) then at 4,000 rpm or so it like bucks forward then it is fine through the rest of the gears. Strange power curve to me. I was just wondering if anyone else felt the same before the 4,000 rpm mark or if I was expecting too much

i think your right it does kinda take off at 4000 seems to hit like a power band and when it does i can definately feel what you are describing

 

[jasonstitanse]

with this wierd lag in first gear, its a wonder how the titan ever won so many shoot outs in all the truck magazines?

i raced my brothers 5.3 silverado 4x4 and could barely manage 1/4 car length. i feel like i need to put a stopper under the throttle so i can step all the way without getting into this strange wot programming nissan has!

 

[jasonstitanse]

does the 2* timing advance help any? not just with over all power, but this strange three level power band.
1. good thru 2500
2. off till 4500
3. on again

seems we should have much faster trucks

 

[[SC]Titan]

i raced my brothers 5.3 silverado 4x4 and could barely manage 1/4 car length.

either he is not stock or something is wrong with your titan :fever:

 

[crippeninc]

Ive also noticed the lag your talking about. Today I tried messing around with using the manual gear shifts, and It seems when I put the Titan in first and gun it, it seems to accelerate faster and I can spin the tires easier. Although Ive heard most people who go to the track get better times just keeping it in drive and punching it?

 

[NICEAWN]

Mine operates in the lag fashion also.....

Anytime you "push" the throttle to the floor it feels powerless and will not really take off from still, but if you slam it on the floor taking less than a second to do it, it will squal through first like it means business. Thats my observation anyway.

 

[roy365]

I have noticed this as well.......i also compared it to a turbo spooling up. It's like it just kicks around a certain RPM's. I thought about resetting my ECU to see if that would change it. I noticed this when the truck was new and totally stock a little. But after each modification the power comes on differently as well as how the truck shifts. I haven't reset my ECU in a while so i could try that for giggles.

 

[jasonstitanse]

Mine operates in the lag fashion also.....

Anytime you "push" the throttle to the floor it feels powerless and will not really take off from still, but if you slam it on the floor taking less than a second to do it, it will squal through first like it means business. Thats my observation anyway.

huh? how should i floor it again. i don't understand this response but i really would like to know.

actually i'd like to see if uprev tuning (mail order) would fix it and add some power up top too!

 

[konigfritz]

Mine doesn't have lag, but the power band is def. around 3500 or so rpm. It actually accellerates better if you don't floor it. about 3/4 throttle then hit it after you get going.

 

[jessefrank]

Mine doesn't have lag, but the power band is def. around 3500 or so rpm. It actually accellerates better if you don't floor it. about 3/4 throttle then hit it after you get going.

I second that. I've noticed that flooring it dosen't produce the best acceleration you have to ease into it. When stock I noticed the "lag". When I had the 2 deg advance + air intake the low end acceleration was awsome I'd say (1000-3000 rpm's) then it would die out till 4-5 k where i'd pick up again. With my S&B intake, jba exhaust and 2 deg advance I lost the real low end torque but the power band smoothed out a lot. Now at 1500 rpms the torque really seems to kick in (sucks compared to below 1000 rpms, though it saves the tires a bit) and it is smooth up to 3500-4000 where there is a little boost but nothing like stock. Anything over 5250 or so and the truck seems to be standing still and just making noise. I'm sure the thin air @6000 feet has something to do with it though.

 

[NICEAWN]

I agree 3/4 throttle does make it accelerate smoother, but for a full power takeoff you can't pretend to floor it, you really have to put it down quick to skip over the 3 powerband effect....

I ride sportbikes, and I know exactly what flat spots feel like, and I'm sure a dyno will back up a lean spot in the fuel map at around 2300 RPM. It is very noticeable unless you slam the pedal down without hesitation, and maybe its just me, but I think this allows a better map for hard acceleration, instead of the highway drag lean map that I'm certain exists.

Funny~~an acceleration technique....reminds me of my dads 72 chevy and a leaned out quadra-jet. You could actually accelerate faster by flooring it multiple times which actvated the accelerator pumps and made it run much better when haulin balls..............