I just bought this car from forum member 35Z in the classifieds section here. I love the car, it is a blast to drive and very nice!

2005 350Z enthusiast, 58,500 miles, 6MT.

Mods:
HKS True Dual after-cats exhaust
Nismo cold air intake
Motordyne 5/16" manifold spacer


My dyno numbers were 228 rwhp, then 232 rwhp.

The guy I bought it from said that it did nearly 250rwhp last year. It seems to run very strong with no misses or anything, but it seems that I have the same numbers as a stock car.

Does this seem low to anyone? The dyno was a Dynojet chassis dynamometer model 248c.

I will upload my graph with A/F on it tonight.

 

also I should mention that I am running 1 step colder plugs getting ready for a nitrous system.

 

Well 232 sounds really low and 288 sounds really high. I was say the 250 setup was more legit and right. Take the average of the two....lol, no but seriously IMO both numbers sound incorrect.

 

i would lose the nismo intake if I was you also

 

Sorry, typo on the numbers.

It was 228, not 288! haha

228 rwhp, then 232 rwhp.

Why should I lose the nismo air intake???

 

People have lost some power with the Nismo intakes... Drop in K&N filters seem better for some later models with the velocity stack in the OEM intake box.. ask you friend if he has the OEM intake box laying around and grab it!

 

i only ran half the nismo intake (after the maf i put a k&n cone filter in) and i have the AAM plenum spacer, test pipes, and stillen true dual and i 255whp and 235wftlbs... i never liked the feel of the full nismo intake seemed a lil sluggish but when you half it, its wayy better IMO

 

I think I have a pretty good idea of why the numbers were a little low.

First of all, I used the NGK 6A plugs (one step colder) in preparation for running nitrous.

Secondly, I accidentally left the two silencers in the back of my exhaust, which is a large restriction.

Is it reasonable to assume that the combination of these two situations would cost me 10 or more hp?

 

Your numbers seem lower than a completely stock 03-06 Z. I would say the average for a stock DE engine is around 245-250whp.

But it may also be the dyno. Can you tell us if any other Z dyno'd before or after you? We could compare numbers that way.

 

whats the weather like? make sure to clean your airfilter and be sure your plugs are gaped right...

 

Northern minnesota, 70 degrees and sunny.

70.58 *F, 28.89 in-Hg, Humidity: 9%, SEA: 1.01

No other Z's or G's ran that day.

 

Silencers will cause a good drop in power for sure. Also, have them run it against RPMs, not MPH.

 

Ditch the CAI

 

More like 240 for the non-rev DE's (mine stock was 241 or something close to that (its been 2+ years)). Dyno's can be calibrated in different ways, along with different corrections. First, ditch that nismo cai. It's not helping anything. Silencers also kill power. Go back to a stock 06 box or pop charger and the take the silencers out. Go back to the same dyno and try again.

 

its cause you dyno'd it in 3rd gear

 

looks like 4th to me. but 5th is 1:1

 

really? de's only hit 100 in 4th? i'm a hair over 100 in 3rd on my hr...

 

I am at about 110-113 at 6600 (116/117 at 6800)......looks like the run was cut short around 6220-6300 to me. Hence the lack of the drastic DE dropoff that happens post 6200.

 

why ditch the CAI??

 

Consistently shown to lose power. Stick to an 06 box or a pop.