Well, I thought my belt was slipping, and it might still be a little. I posted a few days ago that I was only boosting to 3.8 in 2nd and 3rd gears. On my way to the dyno yesterday, I did a 4th gear run to redline (first blink), and got 4.9psi. Then, at the dyno, I had the operator go all the way to fuel cut off in 4th gear, 5psi this time. Today, I ran it really hard in 5th, close to redline and got 5.2. Does this sound right? Temps were are the upper 80's - 90's.

Anyhow, here's are my dynos. This was done a Mustang Dyno at Gruppe-S in Hayward, CA. We were supposed to have three pulls, but my first two, they only ran it up to 7750 rpms. Good thing they let my car rest a bit before the 3rd run, otherwise I would not have caught it. I asked them to run it all the way to the rev limiter. I'm only going to post the graph the final run where they went all the way to redline. Temps are in the upper 80's or lower 90's again.

My mods: Comptech (stock) / AC, JIC test pipe, modded stock exhaust (refab Y-pipe, and Magnaflows)

Here's info on the first two runs (only went to 7750 rpm):

Run #1 (12:12 pm)

238.9 hp @ 7750 rpm
162.7 tq@ 7750 rpm

Run #2 (12:14 pm)

237.6 hp @ 7750 rpm
162.8 tq @ 7750 rpm

My third and final run, done approx 12 mins later, and ran all the way to redline.

Run # 3 (12:26 pm)

256.9 hp @ 8250
168.1 tq @ 7750
Max boost: 5.0

Here's the graphs:





Here's the results of some of the other S2000 and 350Zs yesterday.

s2kkenmark (01?), with only a replacement filter:

180 hp @ 8500
119 tq

Ivan (VAFC only, 02):

175 hp @ 8500
116 tq (?)

Mark (?) - 02, Veilside exhaust, test pipe, AEM intake

176 hp @ 8750
112 tq (?)

Black 02? - intake (dont' know which), test pipe, single exhaust

190 hp (dont' know what rpm)
119 tq (?)


These are some of the 350Z results. I don't have the specifics of each, however.

35th Anniversary, Nismo exhaust - 219 whp (rated 300 hp)
03? Automatic, Injen intake, exhaust, plenum spacer- 214 whp
03? 6 Speed, stock - 198 whp (rated 287)

Based on these runs, I would estimate loss to be at around 30% +/- 2%. They call this the "Heart Break Dyno"!


This is my dyno when I had my SC first installed (DynoJet) - Stock Comptech, Modded stock exhaust (no test pipe). I don't know what boost levels I was running, but since they had the stock Bosch DV in it's original orientation, I have a feeling it wasn't completely holding boost. At less than 1000 miles, I pulled the DV, and tested for leaks by add pressued to the long outlet, and was able to open the diaphram. I have since reversed the DV orientation, which doesn't leak.

277.26 whp and 183.05 wtq (pretty consistent on the two post install runs). I'd like to redyno at this dyno so I might be able to have a better comparison.

 

I by no means want you to take what I have to say as the "right" answer, but based on my knowledge of dyno's and the numbers we see posted up by various people, I'd say that your 256 HP on the mustang dyno is just fine.

You're probably looking at approximately 285 to 290 WHP on a dynojet, which is about what a comptech supercharger w/ aftercooler + some exhaust work should produce on an 04-05.

You could go back to that dynojet again and see what you're putting down, but i'm pretty certain it's going to be in the 285 WHP range.

Another thing to keep in mind is that you'll get different numbers every time you dyno (and especially comparing dyno's done on different days) because of a lot of factors that are just simply uncontrollable.

 

I don't think mustang dynos will have such low numbers or at least not a difference of 35hp. It just sounds a little off.

 

Mustang dynos run about 10% lower than Dynojets do. 255 on a mustang is around 280 on a dyno jet, and around 305 on a dynopak.

 

One of my main concerns was that I was running adequate boost levels. Since I installed my boost gauge, I was only regitering 3.8 in 2nd and 3rd gear. It wasn't until I ran in 4th that I saw 4.9 - 5.2 psi. Is this normal? Or, should I be getting the same amount of boost in all gears?

As for the power, I didnt' know what to expect from the mustang. All I knew was that I was going to get lowered numbers than my previous dyno. Although, the conversion, as some noted, would actually be greater than my prior results. To what extent, not sure, as I've read 10-15% differences between a Dynojet and Mustang. I was hoping that other folks would have been out there to dyno, so it would have been easier to do comparisons.

Looking at my graph, would I benefit from better tuning? Or at least, lowering vtec? I get rather rich from 4900 to 6000 rpm.

 

From what Ive experienced, its normal. In first and second I can only get 4-5 psi. In 4th is where I reach full boost. I have a 7psi upgrade.

I dont recall what the 04-05 kits come with, but 5.5 psi is what the AP1 kits came with origianlly.

 

The actual numbers aside (which admittedly do seem lower accross the board) everything looks close to expected.

What I mean is, on that particular dyno, on that particular day, NA S2000's are getting around 175-180whp (I'm not counting the 190hp run with the unknown intake since it seems to be an outlier from the other 3 cars) and your SC S2000 is getting a best run of 257whp. At best, your gain is about 47% over a NA S2000.

Clearly, I'm twisting the numbers and comparing your best run to the worst of the NA cars, but isn't that how dyno racing is usually done IOW, has anyone ever shown a 300+ hp run on a mustang or dynodynamics dyno?

 

Ya, having been the only sc'd S there that day makes it difficult to make any real statements about my car. The NA S's we can at least say that, despite the individual modifications, they pretty much ran the same. Even including the outlayer - which could just have been a factory freak - he ran 183 / 185 hp, and 116 or so tq on tw previous runs. Which, places him in line with the others. One conclusion that can be assumed, and has been before, is that the stock S is pretty highly tuned off the floor. As for my car, I can only really say that I'm making approx 47% more than stock (on that particular day, on that particular dyno, with that particular operator). Well, maybe they should have an all FI S2K dyno day.

 

Below are the dyno results from my car 2004 with S/C w A/C. No other mods. I have the stock pulley. from what others have sadi it seems like this is normal for the differences between the 2 dynos.


Also, How do youl ike the magnaflos? How do they sound with the S/C? I am thinking about getting them.

 

Looks like our dynojet results are pretty similar. I'm somewhat glad my Mustang dyno results is on par with my previous result, given that the actual differences between the dynos is 10-15%.


I really like them. The sound is much deeper than stock, and a bit louder, but nothing like a lot of the aftermarkets. I had the muffler shop make a true Y-section in place of the stock. On the stock Y-section, Honda just smashed the two smaller end pipe and crammed them into the single pipe - which is common for stock piping. Other than the stock mufflers, this would be the most restrictive area of the stock cat back. The rest of the stock piping is rather straight and free flowing!

Here's some pics:

MagnaFlow (forgot the part number, but it's the straight through design with 2.25 inlet/outlet I think.) Used the stock tips, which they tack welded to hold in place better.




The new Y-pipe