Just dyno'd my '95 5-speed: 173HP
Thread Starter
Supporting Maxima.org Member
Joined: Nov 2004
Posts: 127
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.
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.
Thread Starter
Supporting Maxima.org Member
Joined: Nov 2004
Posts: 127
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"...
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"...
Originally Posted by Fulltone74
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"...
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"...
Also I think a ECU upgrade will really help you out, hard to tell with what you posted without a dyno sheet tho...
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.
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.
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