That's where my money is, not build variation (like I previously stated) or poor break-in.

 

Bri-

What size wheels and tires are the winter set? And, if you don't mind my asking, about how much did they run you? Thanks, man...

-Jon

 

Yeah, I have to agree. Don't forget that gas can be inconsistent as well. I've had a few tanks of gas that leave more to be desired (damn you MTBE additives).

 

several thousand miles apart, yet a near carbon copy.

nice torque yo.

koryo

 

Hey Koyro, is that you in your Avatar? I used to kart, before I had to sell it to pay for school - a nice new Tony Extreme with a fresh Yamaha didn't deserve to hang on a wall while I got my **** kicked in engineering school anyway. I've been out for a year, and after we've got a house I'm getting back into it. My old man wants me to join him in SCCA DSR, but you just can't beat sliding through turns in traffic with your **** an inch of of the pavement!

 

While I'm sure that could have an effect, I don't think that is the case here. At 4000 miles, my car was dynoed in the high 220's as well and I obeyed break-in recommendations to the letter.

Mine was dynoed in 5th and 4th, and produced near identical numbers each time (5th was about 5 hp and 3 ftlbs more than 4th)

Only use 93 octane in mine from "name brand" gas stations (not Johnny convenient store)


Any other theories on where the difference comes from? Cause I'm not buying any of those I mentioned above. The only plausible one I have heard is the variations in build quality... It would not be my first suspect, but it is the only one that my particular dyno runs do not dispute.

BTW, going to go back when I hit 8000 miles to test the "ECU unlock" theory since I still have not done any performance mods to my car.

 

Atmospheric conditions when you dyno'd?

 

Probably not. Dynojet dynos are very consistant in correcting for ambient conditions, which is why everyone goes off of the SAE corrected numbers the car gets, not the base numbers. Even different Dynojets tend to read within a few hp of each other, which is why his 17rwhp difference is puzzling.

I'd hate to think it really was build variation, becuase it would suck to get stuck with an engine that was down 17 ponies at the wheels from the factory. People spend a lot of money in the aftermarket to get 17rwhp.

 

dyno's correct for conditions temp and humidity and how they relate to power ...what they cannot correct for is a modern engines ability to advance and retard timing based on knock, during these hot humid conditions... the 17 hp difference is easily explained away there...

 

Good old knock retard eh? The bane of every performance enthusiast. I'd buy that explanation depending on weather. Maybe BGM can help us out with the details.

BTW... "these hot humid conditions"? Not up here bud. I just got back from the book store, and every light I was tripping the ABS on the ice. I know where you're coming from though, I grew up in Orlando and my folks still live there - they love to give me hell about the weather.

 

Yeah I've read that the VQ35 has a very sensitive knock system, thats probably the problem here... or a combination of all the above.

 

Caswell wrote:

>Hey Koyro, is that you in your Avatar? I used to kart,...
>snip

yeah, that's me. '98 Tony shifter with a '98 TM 125. "Sold it?!" aw, man. get back into it. karts are like crack. cheep, fast, highly addictive and make everything else seem tame and boring. especially street cars. i drive like a granny now.

getting ready for the new season. a new '02 ICC SGM motor. can't wait. 15,000 rpm and good for a stock 43hp.

koryo

 

I know, I know. I look on Ebay from time to time, but the truth is that my wife and I are 24 and trying to buy our first house. Every time I think about spending money I have to weigh how it will effect our future mortgage. Maybe in a year or so once things settle down.

I miss those starts though - we always had nice field of 10-15 karts in Yamaha Heavy and that made for some pretty hair-raising first turns on the small sprint tracks I ran on.

 

Did anyone ever think that what we are seeing is more of a difference in dyno's and correction numbers than a difference in cars? Is Nissans QC that bad that there is a 10% fluctuation in power? I think not.

 

The 226whp and the 244whp 350Zs were done on the same dynojet...

 

sorry...been out of town the last week....both my dyno and the guy before me were done with outside temps of less than 40 degrees and humidity less than 30%....so I don't really think knock retard played a part unless it was from poor fuel...

 

defintely not