Just dyno'd my '95 5-speed: 173HP
 

Hi all:

On a whim, I decided to go get my car dyno'd today.

I did a pull from around 2000rpm up to 6000rpm.
I averaged around 170-175FT.LB of torque, but had a narrow torque peak up to 185FT.LB for just a few hundred rpms around 3000.

My torque line was very smooth from 2000-3000, and then became a lot more jagged, indicating a possible detonation. It was immediately once the torque curve turned upwards to 185FT.LB.

My air:fuel ratio was 14.5 from 2000-3100rpms. From 3200-3500, it dropped to 14:1. From 4500 rpms through 6000rpms, the air:fuel ratio linearly trended down from 14:1 to 11.8:1.

My mods are Greddy cat-back exhaust and Stillen "warm air" intake.
Everything else is stock. Car has 142,000 miles. I had a power peak of 173HP at 5200rpms. The power rapidly started dropping off from there, dropping about 30HP at 6000rpm.

When I used to have an automatic Maxima from the same year ('95), I dyno'd with similar mods and got only 155HP, and that car had about half the odometer mileage at the time. After adding an ECU, I gained 5HP.

Still; I am pleased that my 5-speed can pull 10% more top end power, with all else being nearly equal.

no graph?????? :(

sounds about right

Also, a VI will REALLY fix that 30hp loss you have at 6K :D

Well, I would rather clean up the midrange torque response. Maybe back out a little bit of timing and/or add some fuel.

I wonder if the JWT or Technosquare ECUs can add fuel from the 2000-3000rpm range. Or would I need a separate fuel controller for adjustment in that range? I don't see a need to have the fuel mix that lean (14.5:1) at wide throttle, even if the rpms are lower.

Overall, I am guessing the following:
Add more fuel and a little timing from 2000 - 3000rpm.
Add fuel from 3000-4500rpm -- maybe a bit less timing.
Lean the fuel mix from 5000-6000rpm.


I think if I had either more octane or a better fuel mix, I could have done about 10hp better.

We can only get 91 octane in California. Well; there is one Unocal station in San Jose that sells 100 octane from the pump, but I didn't have any of that in my car at the time of the dyno.

Anyway, I do notice some mild pinging on most days of driving, so I think I am still going in the right direction to add fuel and/or adjust timing.

Of course a VI could help gain some top end power, but I would rather seen 10FT/LB gain from 2K-5Krpm rather than get 20FT.LB only from 5.5K-6Krpms.

Except from yesterday's dyno run, I think it must have been 6 months ago for the last time I ran the engine up to 6K rpms. I typically upshift around 4.5K-5K rpms if I am being "aggressive".

On a side note, sitting in the car with the wheels spinning at 120+mph, was a little scary. I was just thinking to myself -- "I hope those vehicle tie-down straps work well"...

Well compared to a USIM, the 00VI adds throughout the rpm range, if you compare dyno sheets you will see that, mainly up top though...

Also I think a ECU upgrade will really help you out, hard to tell with what you posted without a dyno sheet tho...

i will post the graph once I get it scanned. I don't have a scanner at home.

The MEVI smooths out the torque, but also loses a little bit of it too ..

Ask the shop for the run files. Was it on a dynojet? I think there should be a sticky or rule that states to always ask for your runfiles before leaving the facility.

Test was done on a "DynoJet". I will probably just go back to the shop to ask them for the file.

Get an safc II and enjoy.