saving weight on a 1.7, will it make any difference |
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saving weight on a 1.7, will it make any difference |
drewvw |
May 30 2006, 11:17 AM
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#1
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new england car guy Group: Members Posts: 1,631 Joined: 24-February 06 From: Boston, MA Member No.: 5,630 Region Association: North East States |
With a stock 1.7 how much weight would you have to lose via FG/CF hoods,lids and such to see a performance gain? This is a purely theorectical question regarding how weight affects the performance of the engine, I am not planning on doing this... |
Aaron Cox |
May 30 2006, 11:19 AM
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#2
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
whats your power to weight ratio now?
wont get much better by dropping 50 lbs..... and FG fits like shit most of the time.... not worth it on a nice street car.... track, definitely |
drewvw |
May 30 2006, 11:25 AM
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#3
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new england car guy Group: Members Posts: 1,631 Joined: 24-February 06 From: Boston, MA Member No.: 5,630 Region Association: North East States |
The car is bascially bone stock outside of SS heat exchangers and a bursch exhaust. I figured the weight drop would have to be substantial. I read in the archives about the FG/CF stuff: Great for racing, bad for street cause they don't look so good and collison is baaaaaad. I'm just going to have to build myself a 2.0 at some point, or maybe start by driving one first...are they that much quicker, really? |
Aaron Cox |
May 30 2006, 11:27 AM
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#4
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
a hot 2.0 or 2056 can make 120 hp.....
your used to a tired 1.7... 70 ish hp.... will almost doubling your car's power with no additional weight make an impact? yes. |
Mueller |
May 30 2006, 11:28 AM
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#5
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914 Freak! Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None |
it's just simple math....
let's say your car wieghs 2000 pounds and has 80hp 2000/80 = 25, so you have 25 pounds per 1 hp remove 100 pounds for 1900/80 = 23.75 pounds per 1 hp for referance, the early Miatas weigh 2116 with 116 hp, for a 18.24:1 ratio to get the same hp/pound ratio for your stock 1.7 as the Miata has, you'd have to get your car down to 1459 pounds which is near impossible for a street driven (and safe) 914 (IMG:style_emoticons/default/blink.gif) |
drewvw |
May 30 2006, 11:36 AM
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#6
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new england car guy Group: Members Posts: 1,631 Joined: 24-February 06 From: Boston, MA Member No.: 5,630 Region Association: North East States |
math has never been my forte, so thanks for that mueller.
Heres my problem (besides being bored at work): This club....you hang out here for awhile and all of a sudden your trying to figure out what engine config you should be gunning for next! Which is a compliment of course... my 1.7 isn't tired and runs great, was rebuilt by a pro ( ~10K miles on it) and its fun to drive around the city where the roads dont let you go too fast and yet... well you get the point...aaron ideally I'd like to build a 2056 and probably throw some carbs on it, but I want to stick with the /4. Going to a /6 is too much cost/time/work for me, it would be a bad idea.... |
URY914 |
May 30 2006, 11:49 AM
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#7
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I built the lightest 914 in the history of mankind. Group: Members Posts: 121,038 Joined: 3-February 03 From: Jacksonville, FL Member No.: 222 Region Association: None |
My car WAS a stock '73 1.7. (IMG:style_emoticons/default/laugh.gif)
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drewvw |
May 30 2006, 12:00 PM
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#8
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new england car guy Group: Members Posts: 1,631 Joined: 24-February 06 From: Boston, MA Member No.: 5,630 Region Association: North East States |
when I posted the topic, I assumed you would be the first to "weigh in" (IMG:style_emoticons/default/biggrin.gif) |
lapuwali |
May 30 2006, 03:12 PM
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#9
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Not another one! Group: Benefactors Posts: 4,526 Joined: 1-March 04 From: San Mateo, CA Member No.: 1,743 |
Turbo...
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So.Cal.914 |
May 30 2006, 04:57 PM
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#10
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"...And it has a front trunk too." Group: Members Posts: 6,588 Joined: 15-February 04 From: Low Desert, CA./ Hills of N.J. Member No.: 1,658 Region Association: None |
Find and build a 2.0, save the 1.7 for a spare.
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sixerdon |
May 30 2006, 08:11 PM
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#11
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Member Group: Members Posts: 466 Joined: 23-May 03 From: Dartmouth, MA Member No.: 731 |
OK Drew, try this.
Start with a half tank of gas or less. Leave your top home. Take out your spare and the carpet covered board out. Carpets out. Do you have sound deadening in the engine compartment? Out permanently unless you really do want it. Pump up your tires to 36f/40r. Roll down your windows and go! Tell us if you feel a difference. Don |
Mueller |
May 30 2006, 08:20 PM
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#12
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914 Freak! Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None |
OK Drew, try this. Start with a half tank of gas or less. Leave your top home. Take out your spare and the carpet covered board out. Carpets out. Do you have sound deadening in the engine compartment? Out permanently unless you really do want it. Pump up your tires to 36f/40r. Roll down your windows and go! Tell us if you feel a difference. Don Don, excellent idea !!! I guess you could wiegh those items as well for testing.. |
Brew |
May 30 2006, 08:28 PM
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#13
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That's Captain Moron to you! Group: Members Posts: 391 Joined: 5-August 05 From: Colorado Springs Member No.: 4,546 |
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drewvw |
May 30 2006, 08:56 PM
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#14
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new england car guy Group: Members Posts: 1,631 Joined: 24-February 06 From: Boston, MA Member No.: 5,630 Region Association: North East States |
OK Drew, try this. Start with a half tank of gas or less. Leave your top home. Take out your spare and the carpet covered board out. Carpets out. Do you have sound deadening in the engine compartment? Out permanently unless you really do want it. Pump up your tires to 36f/40r. Roll down your windows and go! Tell us if you feel a difference. Don Hey c'mon! I asked the question more in the interests of science than actually believing it would make a substantial difference. you sixer guys...so cocky with your 911 engines (IMG:style_emoticons/default/biggrin.gif) |
drewvw |
May 30 2006, 08:58 PM
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#15
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new england car guy Group: Members Posts: 1,631 Joined: 24-February 06 From: Boston, MA Member No.: 5,630 Region Association: North East States |
well you get the point...aaron ideally I'd like to build a 2056 and probably throw some carbs on it, but I want to stick with the /4. Going to a /6 is too much cost/time/work for me, it would be a bad idea.... Isn't a 2056 a /4? yes it is...ideally I would build a sweet IV. Six is too much work for me... |
SirAndy |
May 30 2006, 09:00 PM
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#16
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Resident German Group: Admin Posts: 41,676 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
you sixer guys...so cocky with your 911 engines (IMG:style_emoticons/default/biggrin.gif) i think he was serious. if not, he should have been ... (IMG:style_emoticons/default/biggrin.gif) my personal experience: the less HP, the more you can feel the weight difference in the performance of your car ... if you have 600HP, you won't feel a 100lbs difference unless you're a pro driver in a full racecar. in a stock 75HP 1.7L, you *will* feel the difference of 100lbs ... i'd say, remove all unneeded ballast and take her for a drive and judge for yourself ... (IMG:style_emoticons/default/driving.gif) Andy |
sixerdon |
May 31 2006, 05:50 AM
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#17
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Member Group: Members Posts: 466 Joined: 23-May 03 From: Dartmouth, MA Member No.: 731 |
Thanks Andy.
BTW. Take out the passenger seat for this run. 30 seconds to remove. No passengers for this run. Do it!! Don |
bd1308 |
May 31 2006, 05:52 AM
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#18
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Sir Post-a-lot Group: Members Posts: 8,020 Joined: 24-January 05 From: Louisville,KY Member No.: 3,501 |
Whatever you do, don't carry a 914 engine in the front trunk....
talk about ballast...it was pokey when the engine was in the trunk... b |
BK911 |
May 31 2006, 08:51 AM
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#19
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Senior Member Group: Members Posts: 672 Joined: 19-February 04 From: Rocky Top, TN Member No.: 1,674 Region Association: None |
stock car: 2000#/80hp = 25#/hp
lightened car: 1900#/80hp = 23.75#/hp So compare new #/hp to old #: 2000#/23.75 is like having 84hp in a stock car, so about 4hp per 100#'s. |
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