I recently dynoed to see how much power I gained from all of my mods and was somewhat disappointed by the result.
http://forums.maxima.org/showthread....hreadid=233883

My first dyno was done in December of 2000 in 45 degree weather.
163.6 hp @ 5200rpm and 183 tq @ 4400rpm
---JWT Pop Charger
---Custom 2.25" catback exhaust
---18x8 Enkei NT-03s

I was happy with the results, and I knew that my 18s were hurting me some.

My next dyno was the disappointing one:
168.51 hp @ 5800 rpm and 179.97 tq @ 4500 rpm
SAE corrected 99.3 F, CF=1.02, 29.68 in.hg, Humidity 44%

I gained some peak horsepower from the VI, but I lost a considerable amount of torque across the midrange. I also added more mods besides the VI, so overall I felt like I should have been in the ~185hp range. The above hp was even after I tuned with my AFC to gain some hp in the midrange.
---JWT Hybrid
---Variable Intake Manifold (MEVI)
---Warpspeed mandrel Ypipe
---Unorthodox Racing UDP
---Walbro 255lph HP fuel pump
---Apexi SAFC II
---1 step colder plugs

The good:
The VI smoothed out my torque curve considerably.
The dynos were done on different Dynojets, so there's probably some variablilty there.

The bad:
I probably lost torque from the colder plugs, 18s, and possibly even the 2.25" exhaust (especially with nitrous).

Any comments welcome.
-hype

 

The colder plugs definitely hurt you, a lot.

 

 

Tt appears that the S-AFC is useless on an N/A car. That's good to know. As far as the plugs, yeah, they will hurt.

 

Yeah I really didn't need the SAFC too much even though I had a Walbro (5-6psi higher fuel pressure than stock). I mainly got it for safety with the nitrous, but it does have useful features for autocrossing
-hype

 

What does it do that helps for autoX?

 

that walbro is going to make you run rich.. and those colder plugs are going to drop you about 10 - 15 hp

 

I can graph rpm and throttle % versus time using the graphing monitor. I haven't gotten to use it yet, but using the graphs with my in car camera mount should really help me fine tune my runs. I love autocrossing, but everything happens pretty quickly and so much of it is by feel. Now I have some numbers so I can see how hot I was coming into a corner, etc.

The Walbro really didn't make me run that rich even though I was at 40psi at idle and 50psi at WOT without a FPR. I knew I would lose some with the colder plugs, so now I guess I need to dyno with stock heat range.
-hype