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A Lime 240Z spruce up


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#41 WA240Z

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Posted 24 July 2016 - 04:02 PM

And the completed interior with luggage straps and harness/strut brace.

 

DSC01225 (640x480).jpg  DSC01549.JPG

 


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#42 chris240

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Posted 24 July 2016 - 04:09 PM

Immaculate...
Hmmm Im running open ram tubes at present, wouldnt have thought youd pick up a simple 4 hp by enclosing it, good result.
I think I need to get a box for mine now

#43 Gareth. J.

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Posted 24 July 2016 - 06:34 PM

Would the better hp result from a slightly lower intake temp with the box on? Cooler air would be denser and account for the leaner afr.

 

What were the final AFR's?



#44 d3c0y

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Posted 24 July 2016 - 07:03 PM

Also would be interesting to see the change in torque.



#45 WA240Z

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Posted 24 July 2016 - 07:35 PM

I think it is the cooler intake that has given the bump in HP, if I had thought about it at the time I should have taken the cold air piping off and given it another run with just the air box, would have been a good comparison. The high speed A/F ratio ended up being 12.4:1. Unfortunately I didn't get torque figures to compare during the runs, only the end result. Its the first time I have had a car on a dyno so I didn't know what to expect I just let the guy do his thing without getting in the way. 

 

The good news is though the air box isn't causing a big deficit.

 

Just took the car for the second drive of the day, it is so enjoyable to drive, and that is the whole reason I have it.

 

Billy


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#46 Gareth. J.

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Posted 24 July 2016 - 09:40 PM

Nice work Billy! A HP gain and great OEM looks is the best of both worlds. Love it  8)  



#47 d3c0y

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Posted 25 July 2016 - 08:36 AM

I'm genuinely impressed, I guess the L24 with 40s just doesn't need that much air. I wonder what the tipping point is?



#48 dat2kman

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Posted 25 July 2016 - 11:08 AM

I'm genuinely impressed, I guess the L24 with 40s just doesn't need that much air. I wonder what the tipping point is?

With jst under 400cc pots, and valve overlaps/duration, they dont really suck in that much air, and a 40mm hole has way more capability.
Its s quite pissible to run the same 40mm holes, with larger diam choke, into a 500cc pot with no drama, at 7000+ rpm.

Heck, i ran all six pots at 490 odd CC's through one only single 53mm diameter hole, and quite capably managed 214hp at the wheels.
( but, as you know, ts a bit f effort to get the complete induction setup to all work correctly!)

Yep, a cold air box, with a nice big volume of air around all the trumpets, s a good move!

#49 WA240Z

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Posted 25 July 2016 - 11:23 AM

Cheers guys. 

 

I was conscience of making sure I left as much volume after the rear carb as I could.



#50 Bonkers

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Posted 25 July 2016 - 04:54 PM

What gap do you have from the end of the trumpet to the air box surface?

I made one some 25 years ago out of scrape alloy and I found there is a sweet spot for trumpet length and air gap to the box surface for best performance . I also left the box open at the end with a filter for air flow. Keeps the air cooler I think

It's are bit of a dark art getting it right. Air temp and air flow, but it does make a difference..     



#51 WA240Z

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Posted 25 July 2016 - 10:38 PM

50mm from the end of ram tubes to the face of the inside of the air box.




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