Disappointing Dyno Results

[Kwando]

Here are my results. I warn you all, the results are VERY disappointing. What can be wrong?

Dyno was done at PFI in Fort Collins. Temperature was at 60 degrees.

I have Injen CAI intake, and Neuspeed.

ww.imagestation.com/picture/sraid29/pc83bd31e5ddfe5e3f87a4f7dc02786ca/fdee01a1.jpg.orig.jpg

I have a few questions about dyno results.

- Why does the power curve drop at 6500.
- Why is there a huge jump when the dyno started?

A S2000 was dyno'ed last week on the same dyno and he got 198rwhp. The only mod he had was a K&N drop in filter. Normal RWHP's for S2000's are 200.

Why is mine so low? I know the altitude is not it, especially after the previous S2000. Everyone was saying the car was running to lean. The CAI is taking in too much air and there is not enough fuel. We compared the dyno against some other S2000's that they had. Another S2000 was at 188rwhp but he had a VAFC.

I am ordering my VAFC and hopefully I can correct everything. Any other ideas?

What can be wrong?

I also have some information about a Dyno day for them. See my other post.

[Kwando]

Oil was also topped off.

[Dr Wankel]

The graph didn't show up.

[Kwando]

cut and paste the link in your browser. But you have to add another "w".

[Brian]

I would assume that the dip you are seeing is right after the vtec crossover correct? A lot of extra fuel is dumped after vtec. It could just be that the s2000 ecu especially doesn't like the extra fuel. Perhaps a fuel controller is in order.

[HONDA GHANDI]

was the dyno set to automatically correct for altitude?
I is impossible for it to be running too lean just becuse of a CAI.
The computer would have to be faulty of have incorreect inputs from one or more of these sensors: O2, MAP, TPS, BARO, CTS.

[Kwando]

The dyno is corrected for this altitude.

Could it be the combination of the Injen CAI and Neuspeed Exhaust? Maybe I will swap back to stock exhaust (since it is easier to change) and go next weekend for another dyno. I would hate to have to remove the bumper to get the CAI off.

What else could be the problem?

If is it a sensor or ECU problem shouldn't i get a engine code?

[HONDA GHANDI]

thats what I mean, it is pretty much impossible to have a complete sensor failure and not trip a code. How do these tuners know you are running lean and how lean is it. Are they guessing or did they have a five gas analyzer hooked up and a test pipe installed? I think something is fishy.

[Kwando]

There was no evidence that the car was running lean. Just assumptions. The MR2's results were exactly where they were suppose to be.

Can it be because the exhaust not having enought back pressure?

[B16crxTurbo]

Originally posted by Kwando
The dyno is corrected for this altitude.

Could it be the combination of the Injen CAI and Neuspeed Exhaust? Maybe I will swap back to stock exhaust (since it is easier to change) and go next weekend for another dyno. I would hate to have to remove the bumper to get the CAI off.

What else could be the problem?

If is it a sensor or ECU problem shouldn't i get a engine code?

The dip after the start is just because of when the botton was hit to start the sampling. Whoever was running the car probably was still on the gas a little when they hit the sample, then let off and got back on it. You might try it again and make sure you are totally off the gas before hitting it and starting the sample. I would have to agree that dip in the middle is VTEC, it is very common and I have seen it on my own dyno graphs before I was boosted. As for the overall number being lower, no clue. Maybe you need an oil change? Or maybe your car isn't fully broken in or something? I have heard that they can make more power after some miles are on them.

[HONDA GHANDI]

Kwando's car is plenty broken it at 10K. How many runs did you get? Were they all about the same? Im guessing that the exhaust may be the culprit and if the under hood temp was hot the Injen wasnt helping matters. It really needs to be breathing cold air to work effectivly.

[john]

Just out of curiosity, what's the correction factor used on that dyno?

Is 180 hp not what you expected? That's pretty good for such a lightweight car, IMHO...

Where does VTEC turn w/your motor?

Intake and exhaust will not make your motor run lean. The ECU still knows about all the air the motor is consuming and will squirt enough fuel to match the mass of air. How did 'everyone' determine that your car is running lean? What do your plugs look like?

I'm guessing that PFI doesn't have a wideband, and that's the only REAL way to determine what the A/F ratio is. Aftermarket gauges use the stock O2 sensors, which are most definitely not tuning devices.

$0.02 worth.

[john]

One more thing - Powerhouse racing? Isn't that in Texas? :) :) :)

[Kwando]

Car should be broken in by now. I have 10,400 miles.

Checked the plugs last night. They seem fine and tight.

Oil was just changed 2 weekends ago. Check before I left yesterday and it was topped off.

About the CAI, that is what i thought at first but to loose 20rwhp is a little too much. Like i said earlier the fan was not strong at all. Can it be that it was not getting enough air in the front of the car?

They did not have a wideband O2 sensor.

Someone on www.s2ki.com (http://www.s2ki.com) recommended getting my valves adjusted. Someone gained 15hp from just getting a valve adjustment. Here is the thread I have started on that board. http://www.s2ki.com/forums/showthread.php?postid=539531#post539531

Tobi, want to do my valves this week? How much is it going to run me? Or do you even think this is the problem?

I plan on going up there next Saturday or Sunday and bringing the stock intake and exhaust and doing runs again. Anyone is welcome to join.

Any other ideas?

[Kwando]

Originally posted by john
One more thing - Powerhouse racing? Isn't that in Texas? :) :) :)

That is actually PFI in Fort Collins. I don't know why they called the Dyno portion of the shop Power House Dyno.

[HONDA GHANDI]

Your valve adjust will run around $100 but I dont think that will cause it. The car would be running pretty crappy if the valves were off that much.

[B16crxTurbo]

Originally posted by Kwando


That is actually PFI in Fort Collins. I don't know why they called the Dyno portion of the shop Power House Dyno.

They call it a that because the dyno is actually owned by Brent's(PFI owner) brother, Lance... FWIW