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- VIDEO - Ok.. I know I love the SR20DET powered 240Z.. now it's in action!

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Estimated 11 flat in the quarter w/ that little of power output? Whats the cars wet and dry weights?

 

Est 2400lbs w/ 360rwhp shows a high 11 time possible' date=' so i'm trying to see where that extra three quarters of a second is coming from.[/quote']

Traction plays a major role in 1/4 mile times. I own an Evo that ran 12.5 with 320whp, 12.0 with 365whp and can run a very low 11 sec with 30psi and 493whp. All that weighing in at 3350lbs so I can say that with 2400lbs and a 1.5 60ft the sr240z can run a low 11sec 1/4 with a great driver.

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Filefront.com will host the file for free as long as you want, but you won't be able to direct link download. People will have to go to the site link you post and go through a download que for the file (usualy isn't any wait, unless you've got 50 people downloading).

 

CLEAN Z though man. And I believe that 360HP would be plenty to scare the crap out of most people, even car guys. Ever seen what 100hp over stock will do in an old MR2? Dang, with light cars that have the right suspention setup, it'll feel like the car's pulling your gut apart. I'd love to take a ride in that Z. Now that I think about it... between all the car i've race in, i can't recall street racing anyone you wouldn't be able to beat. Fastest car I ever street raced was a 13B powered triumph, and you could have killed it, considering I beat it with a 93 cobra.

 

Forget street racing man, that thing is track bound for glory.

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i would like to congratulate you, you have just shaken my whole plan for my car, that looks so clean. I have custom made boyd coddington 17s, building custom metal flares.. etc.. and only decided on that after months of not knowing if i wanted old school or new school, and now, im thinkin of selling the boyd rims, forget the flares.. and going with zgs and some 16s.you wouldnt mind if i copied your paint, wheels and body work would ya? you know what they say, imitation is the sincerest form of flattery :)

 

by the way, where did you get your zgs from, ive had a few sets and those look bigger? might just be the color and wheels though.. if they are, they may fit my wheels and i would have no need for all this trouble..

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Guest PROJECTRB240SX

In All Respect To The Guy Doubting An 11 Sec Sr 240z, Its Very Possible.

 

My Car Which Was Originally Done By Them Weighs 2310 With Me (180lbs) And 14gals Of Gas.... It Makes ~200whp On Stock Boost. Stock Trans, 3.9 Open Diff, 205/50r15 Federal Street Radials, Lightend Flywheel, And Fmic.

 

The Car Ran 13.1 On Stock Boost.... I've Never Ran It At A Full 14 Psi Which Nets Around 250whp, But I'm Sure Since I Have No Traction Issues At Stock Boost With The Added 50hp I Would Be Around 12.7 Or So. With An Extra 110+hp I'm Sure You Can Shave 1+ Second Off The Time With A Better Driver Than Me.

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damn christian 2130 lbs is good for a full street car. now i really want to go get our car weighed just waiting to go to the truck scale by our house, i should be going before this weekend hopefully.

 

BTW: the flares are ZG Flares from MSA and the watanabes are 16x9 -13 offset front and 16x9.5 -19 offset rear.

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Guest PROJECTRB240SX

With Out My Fatness Then Yeah It Would Be Around 2100lbs.... If Only I Could Do The Biggest Weight Reduction Of All, Shaving ~30lbs From My Waist And Stomach ;)

 

WELL I GUESS THE 72 WAS ONLY ~2400 FROM THE FACTORY. THEN THE SR WAS INSTALLED (~150LBS), THE INTERIOR WAS SEMI GUTTED (~30LBS), THE HEATER ASSEMBLY REMOVED (~20), THE ENGINE BAY WAS STRIPPED OF ALL BUT ESSENTIALS, SPARE TIRE REMOVED, LIGHTER WHEELS AND TIRES, THE LIGHT EXHAUST WAS INSTALLED, AND I'M SURE A FEW OTHER THINGS WERE DONE TO LOWER THE WEIGHT. IN THE NEAR FUTURE I HOPE TO GET MY FIBERGLASS SS HOOD INSTALLED, THE WHEELS LIGHTEND FURTHER (KONIG REWINDS), REAR DISCS INSTALLED, AND A WELL CELL... THIS SHOULD SHAVE ~20+ ADDITIONAL LBS OFF.

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wow, amazing the effect wheels and colors have, thats where i always get mine from, and yours look bigger, maybe i just have flare envy, actually i figured it out, ive never seen them painted, i install and let them get the car painted, so mine always come white, yours is black, black ones are always bigger hahaha

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You should be pretty light, my 71 I had ages ago, with full interior, spare and ac, with about a half a tank of gas weighed in at 2250.

 

So you have the figure the SR is lighter and you lost a lot of spare parts with the car as well, I would no doubt think you are at least in the 2000 range.

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I'd be interested to hear what the differences are with that engine and a higher ratio. I'm of the opinion that lower ratio is better for turbo engines, but I'm always willing to hear of others' experiences.

 

 

In my experience, thats not true. Sure, the longer gears help spool the turbo, and thats great. But, the faster you go across your power band and get into the next gear, the faster your car is moving down the street. Longer gears make the engine rev slower, and that makes the car slower.

 

In my 180sx, I ran a two-step rev limiter to spool the turbo off the line. It would boost 1.6kg (~22psi) from the moment I shove the gas to the floor. Coming off the line with a 4.90 rear end, an OS Giken close-ratio tranny (with a taller 1st gear than stock) it took off like a bat out of hell. :icon44:

 

Just to give you some perspective, heres a link to the dyno video of my old 180sx with SR20DET with a Tec3 ECU, and a T04S turbo. It made 399.8ps at the wheels which translates to 395 rear wheel horsepower. (at 1.4kg of boost)

 

http://72.29.75.31/~videof6/features/hugh/HughDyno399.mpg

 

Notice how short the run on the dyno is. From the moment the wastegate opens until he stops is very short. It's also 5th gear, because thats the only gear that would hook up on the dyno. (and I still had smoke from the tires, even with people in the trunk for extra ballast - so power was being robbed on the dyno) The short gears make it want to rev so quickly, the tires couldn't push the rollers fast enough.

 

Now if that car winds up that fast in 5th, and the Z pictured here winds up that slow in 4th... which car do you think will win in a race? I think the answer is obvious.

 

Granted, top end suffered. It would only go about 150-160mph. However, it would rip all the way to redline in 5th gear without a hint of hesitation. (hitting top speed was EASY)

 

You don't want something crazy like a 4.90 on a stock transmission, though. A 4.66 maybe, 4.36 is best I think. Too short = crap for first gear. The OS trannies have tall 1st and 2nd gears, making a shorter rear end a necessity.

 

Now with a short final gear, you must shift very quickly to see the real benefits of it. If you granny shift, you will suffer. I was a shifting fool in my 180sx.

 

 

A side benefit of short ratios is less stress on the drivetrain. When you launch a 3.90 VS a 4.90, the abuse hitting the gears is much worse. Think of starting out uphill on a bicycle in top gear. :)

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Im sorry but a 4.90 rear with a 400whp car is just a waste of power and way to much shifting going on. A 4.90 will make your car "feel" extremely fast since traction is not there until 3rd maybe. I could understand a 4.90 for a very quick exit out of corners on a NA autocross Z, but not on a turbo high WHP Z. No matter how much power you're putting down you always waste time when shifting. I have a 494whp Evo MR that I drive everyday and the stock gearing is too quick to actually put the power to good use. Sure your revs build up quick but a 400whp Z should do perfect with a 3.90 or maybe even a 4.11. So if you were to line up with a Z with the same mods you have exept for a 3.90 rear you would lose in the 1/4, specially up top.

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SR240,

I saw this car a while ago, and never got around to saying how f-ing beautiful it is. I love the wheels and the flares. I always thought 17's looked perfect on a Z until I saw those 16's, they look gorgeous! Excellent fit and finish on all the fabrication. So did you ever get it weighed?

 

Hugh and Superz,

You guys shouldn't argue over rearend ratios without including the tranny ratios that you're using. Its like one guy with a .75:1 top gear and a 4:1 rearend, arguing with another guy who has a 1:1 top gear and 3:1 rearend ratio (both have the same wheel-speed). Just trying to help :D

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Sweet mother mary of Jesus!!! I saw that car on the front page of Wheelchoice when I was looking for some Wats and it's my wallpaper on my puter. Now to actually read about it and see more pics of it instead of just that one pic is like breath of fresh air. I love my NA L28 and not a v8 fan I think when the time comes I know where my money is going for the 280's new powerplant. Sorry if I missed this but what did you have to do for mounts?

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