Hey guys, I really need help/suggestions. I have added a few mods over the last few months and after my Dyno yesterday I am SICK!! If anybody has ANY suggestions I would greatly appreciate them. Here goes the mod/dyno history.

1. Base run in April (just a Z-tube/K&N). 80 degrees 48 % Hum. 232 HP/222 Tq

2. Second run in May- added Fuji cat back and Grounding kit. 92 degrees 72% hum.238.9 /229 tq.

3.3rd run 9-17- Mods-Crawford Plenum, Kenetix Cats plus previously mentioned mods. 92 degrees 68% Hum 230 hp/ 221tq.

What the heck is going on? Any clues? I reset the ECU and put around 200 miles on it after the last mods. Needless to say I'm sick about it. almost 2K in mods and and an average of 0 hp gain??? I realize that bolt on's typically don't do a whole lot but the ones I have shouldn't make it lose power should they??!! Most of the guys/girls I've read about with the exact same mods are at least in the 245-255 range. Has anyone had a similar issue with the same mods? I have no idea where to start as far as trouble shooting? My dyno guy said it was prob a timing issue. I know I need to send my ECU to Techno Square but I cant see spending another 600 bucks just to have my heart broken again. Any help or advise would be great. TIA for any help!

 

I would seriously consider the fact that the dyno may not have been calibrated correctly.

 

The numbers you posted are useless w/o the dyno graphs over laid.

You could have gained 15rwhp & 20rwtq at 3500rpms and lost a few hp/tq at or near your cars peak. You could also be running 0.2 seconds quicker in the 1/4 mile.

Remember, you've only given us 2 data points out of several thousand and you're asking us where your power went?

 

True, thanks for the heads up. I was going to post the graphs but my scanner is dead. Hopefully I'll be able to post today. I talked with Doug at Crawford this morning (great guy BTW) He suggested that the dyno may have not been calibrated correctly and the car sat all day before going on the dyno. He suggested that the oil temp/tire pressure has allot to do with it as well. After driving this morning it does feel stronger esp. 3200-4500. I dunno?

 

I've heard cats make your car run rich. What does your Air/Fuel look like? This could be the reason behind the hp loss. An TS ECU could fix this.

 

I bet you forgot to apply the stickers.

 

AH HA! that must be it.

 

That was my first thought too, but the AF was almost exactly the same as my highest run. I've had a couple of people say that the dealership can bump the timing up a bit and it usually helps. Unfortunately, there's only one Infifniti dealer within a 150 mile radius of me and they are NOT AT ALL MOD friendly. I have considered th TS reflash but I can't bring myself to spend anymore on "bolt on's" and get maybe another 5 hp. I am at a loss?

 

Due to whatever differences in setup, conditions, dyno, (and fans) setup, whatever, may have affected your results. -----

.... but you haven't said what the butt dyno tells you??????..........
...and timed runs at a track would tell something too.


I'd bet that if you did another dyno on the present state of tune, you'd find that missing hp.
If not, then a TS ECU reflash might be the answer.

C.

 

[QUOTE=Gsedanman]Due to whatever differences in setup, conditions, dyno, (and fans) setup, whatever, may have affected your results. -----

.... but you haven't said what the butt dyno tells you??????..........
...and timed runs at a track would tell something too.


I'd bet that if you did another dyno on the present state of tune, you'd find that missing hp.
If not, then a TS ECU reflash might be the answer.

Yeah, I know it's all relative, the butt dyno is calibrated = to how much money was spent Actually it does feel stronger especially between say 3-4500,whats really wierd is that the conditions were almost identical and I double checked the F/A and it was still at 14.2. I do need to get it to the track to see for sure if my times have improved all. thats the only thing I know to do before spending the $$$ for the re-flash, Thanks!

 

I felt the same waywhen I was full bolt ons and no TS flash.... It felt MUCH stronger mid range, but 4.5K + didnt really feel much differnt.....

Read up on www.technosquareinc.com youll understand why. Youve made your engine breath much better, but nissan/infiniti still cuts the a:f back post 4.4K no matter what you do as far as bolt ons. I believe its 12.5:1 pre 4.4k and 10.5:1 post 4.4K. Once the ECU is done this is fixed, as well as the drive by wire adjustment. Infiniti/Nissan really didnt want these things being revved out it appears. After I had the TS sent to me, the car felt amazing, almost vtec-y if you will, as right as you break 4K the car feels like it just comes alive, as opposed to "dying out" as it felt like before I did the mods.

 

[Read up on www.technosquareinc.com youll understand why. Youve made your engine breath much better, but nissan/infiniti still cuts the a:f back post 4.4K no matter what you do as far as bolt ons. I believe its 12.5:1 pre 4.4k and 10.5:1 post 4.4K. Once the ECU is done this is fixed, as well as the drive by wire adjustment. Infiniti/Nissan really didnt want these things being revved out it appears. After I had the TS sent to me, the car felt amazing, almost vtec-y if you will, as right as you break 4K the car feels like it just comes alive, as opposed to "dying out" as it felt like before I did the mods.[/QUOTE]

Thanks, out of curiosity have did you ever do a base run before and after mods? I spoke with Doug at Crawford and he said that the TS reflash would help, but that it shouldn't be something I had to do to see any gains from the previous run. Again there are so many variables to the dyno thing it's really hard to pinpoint. Doug suggested that the Oil temp not being up to normal (car sat all day before dyno), tire pressure and calibration of the dyno, etc. All could have played a role in the loss. I think I am going to take it to the track this week to see if there are any improvements in time and drive on the new mods for a couple of weeks and try to dyno it again. If that doesn't work TS will be my only hope I guess. The worst part is sending the friggin ECU to them and the car being down for a few days (this will def. make the wife VERY suspicious). All of my mods are my dirty little secret