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Discussion Starter #1
Hi all,

Went down to the rolling road today, was attending with my car club and wasn't going to do it but then decided to go for it. I recommend it to anyone especially if you want to see how much an improvement the latest mods have made.

My 240Z has an L28 engine with FI and thats about it, no mods.

Are these reading normal? We only revved up to 5,000rpm max. (the L28 engine doesn't have much power after 5,000)

(All the figures are for BHP/Torque at the wheels)

Max BHP was 126 @ 4,500rpm
Max Torque was 148 @ 4,000rpm

Did she do ok? For a 240Z with a stock L28 engine.

Went with the 300ZX TT guys and they abviously did alot better!!

Appreciate your views.

THANKS.

Jules
 

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That's probably about what you'd expect at the rear wheels AT THE POWER PEAK. But you were only at 5000. The max hp rating is at 5600 for the FI L28. So maybe you would have made 175 crank or more. Your 126 at the rear wheels is at least 150 at the crank, and thats only at 5000 rpm, which is really good for a stock motor. Do you have exhaust/intake, etc?
 

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Discussion Starter #3
Matt,

Thanks for the fast reply.

It's the first time out on the rolling road, I've only owned a Z now for 3 months, so all is really new to me.

As far as I can tell the exhaust is OEM. I do however have a cone air filter, I forgot to mention that. Maybe thats what made the difference.

I am going to take the mods slowly, exhaust will be the next option. At a later stage I'd like to go for the diesel crank.

Also thanks for letting me know that 5,600 is the peak revs.

I feel alot better now as I wasn't too sure if she was under performing.

THANKS.
 

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From what i understand your engine peaks its HP at 5600, so stopping at 5000 didnt reach your peak, but still with your #'s and pretty much bare stock, you did nicely.

Matt
 

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I would agree that you should have took it higher, but even without going higher you did really well. Next I would try playing with ingition timing.That is what makes or breaks "my" car.

Good luck
Jason
 

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Guesses and grabs...

Sounds like you got a lot of "guesses and grabs" regarding your power output.
My .02: you're right on in your numbers. This means you have 126HP as rated by that dyno on that day. It does not mean anything about your crank HP. That's a "grab" and pulling to a theoretical 'power peak' is a "guess" at best.
Why did they stop the dyno pull? was it possibly that the operator saw that your power curve was settled out, and realized tha pulling it higher would accomplish nothing but rattling lifters?
Seriously, take a look of some of my prior posts concerning stock HP levels and you will find that yours is EXACTLY in line with what I have claimed for several years now.
Many people are shocked when they take their car to the dyno for the first time and find out what it produces. Thats' why it's entertaining to watch guys post "I just bought a car and want to build it to 250HP" Can you imagine YOUR car with almost exactly TWICE the HP it has today without doing anything else?

My suggestion: Now you have a baseline, and can quantify any changes you've made from this point forward. Next time, make sure your valves are in proper adjustment, and that you have a good ignition system to handle the running at higher rpms. Run strong, welcome to the fold of the "Enlightened" and out of the realm of "BenchRacer" you have taken the first important step!
 
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