I own a base G35 HR Sedan, I know its not exactly the same as the vq37vhr found in your G37s but their relatively similar. The other day I went to test the car on an empty airfield and compare it to my friends G35 HR Sport version. When we were both stock, I would take the lead of about 1 to 1.5 car length as speeds climb. The other day we tested again, but now I had the JWT Pops and the FI Catback. The other G35 S only had a K&N Drop-in, everything else was stock. When we raced, we were dead even. Everytime the same result happenned. I even felt him faster at above 100mph.

The question is have any one of you G37s noticed something similar with the JWT?? I took it out the other day and the car felt way faster. For some reason, at higher speeds the car accelerated more quickly. But I remember that people were gaining something with the JWT. Can it be that dynos are not simulating well high speed flow, and that the stock intake at higher speeds is more efficient??

I just don't know if I should try the Stillen Gen 3 or just give up and put in the drop-in.

Thanks, any opinion would be appreciated.

 

I don't think side to side racing with a different car and different driver makes a fair comparison on the parts. Too many variables.

JWTs were dynoed bone stock to have +10hp. Search around for the dyno chart. But some didn't feel anything, some even felt loss down-low.

I didn't feel anything when I had JWT. Didn't feel any loss when I took them off to go back to stock.
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[QUOTE=ucla bruin;2555187]I don't think side to side racing with a different car and different driver makes a fair comparison on the parts. Too many variables.

I would have to disagree with you on that one. I think racing the other person you have always compare your performance is the best way to know for sure if the performance part is working. Dynos are to unrealiable, the car is just sitting with a fan in front, but that fun will not simulate real world flow.

Apart that both my car and his are automatic, the error is greatly reduce and the runs were performed on a roll instead of trying to perfectly match a standing still run.

 

What if he jumps half a second before you do or vice versa? And how will you ever know?
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your butt dyno is very unrealiable

 

[quote=alti35;2556708]
Dynos are NOT unreliable. Thats why manufacturers use them as a final test to determine power output. They are calibrated on a regular basis and usually accurate to about 1-2%.

 

If you're referring to the Injen review, dyno was used solely for the purpose of comparing the gain, not final output.

I just think there are too many things that come into play when finding out performance from side to side racing with a different car.
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I don't think he jumps a half a second before me or vice versa, if we miss the roll then we try it again, simple. We are really consistant with each other. before mods I would have a car length on him, with mods we are tied. Anyway the best way to compare power is by pairing up similar cars and see their differences. Many people have gone to dynos posted up 5 to 10 hp gains, but suddenly lose when racing in real life. Dynos are good for reference, but so are trying things in real life. Not everything is mathematically or scientifically proven, you have to also conduct real world testing (which is one of the best ways to really know for sure).

 

I agree with you on the real world testing part. But my question is (and I'm not trying to discredit you or anything, just genuinely wondering what you think) if you floor your petal at a rate that is only 0.3s faster than he does, either one of you will know since it is so hard to trying to match up the start of the race PERFECTLY. That's what I mean by driver errors. It's near impossible to have 2 people perform the exact same action at the exact same time and the exact same speed.

And we all know that a few tenths of a second here and there can add up to half a car length or more at the finish line.

If you have 2 identical robots and can match their speed and reaction to almost perfect, put them in 2 different cars with mods, then I'd agree with you 100%.


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Noob question...
How often do you have to clean the JWT filters and how do you clean them?

 

I understand your point, and I know it can affect the outcome, its just that it seemed that if I was faster than him stock against stock, and now with exhaust and intake I am dead even it just doesn't sum up. The exhaust should have given me another car length, and the intake maybe something or just stay neutral in difference. I guess I'll just try the Injen or the Stillen 3G and test if there is any difference.

Anyway, thanks for the opinion.

 

Hmm JWT and FI catback, I'd like to hear that combo!

Heard some interesting feedback on the JWT yesterday. A friend with it felt the throttle response improvement right off the bat and did some real world testing, he was able to keep up with a chipped 335 till 3rd, which is something he wasn't able to do before.

When I had my JWT, I can't say that I felt a difference
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You'll hear that combo real soon Danny boy.

 

I have that combo but dont know if theres any vids floatin around here or not...

 

The JWT with the FI exhaust sounds great in the G35, I would imagine that in the G37 they should sound similar or better.