1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

need to get FASTER

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Old Jan 26, 2008 | 11:26 PM
  #26  
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From: St Joe MO
Originally Posted by pportnosgsl
For dragracing,you need to ditch the light flywheel,killls the rotating inertia that helps you not only get out of the hole.but keeps the momentum all the way down the track.
Sorry, have to disagree with you on this point. True, a heavier flywheel helps the launch, but that's it. In the long run it reduces overall ETs. Fidenza tested thier lightweight flywheel against a heavier stock one. Overall ETs were quicker with the Lightweight. I don't recall what they used for a test mule.

His timing is fine. That's what it's supposed to be stock at full mechanical advance above 4k rpm.
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Old Jan 27, 2008 | 02:09 PM
  #27  
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Originally Posted by trochoid
Sorry, have to disagree with you on this point. True, a heavier flywheel helps the launch, but that's it. In the long run it reduces overall ETs. Fidenza tested thier lightweight flywheel against a heavier stock one. Overall ETs were quicker with the Lightweight. I don't recall what they used for a test mule.

His timing is fine. That's what it's supposed to be stock at full mechanical advance above 4k rpm.
you can disagree,i have run both,and cut almost a half second off my E.T. with the heavy flywheel,because the light flywheel reduces rotating inertia,the engine will rev very quickly,it also looses rpm just as quickly during a shift,when using the heavy flywheel the rotating inertia allows the engine to keep momentum,RPM will not fall during shifts,that is what i have experienced in the 10 years dragracing my RX-3SP
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Old Jan 27, 2008 | 04:02 PM
  #28  
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Originally Posted by pportnosgsl
For dragracing,you need to ditch the light flywheel,killls the rotating inertia that helps you not only get out of the hole.but keeps the momentum all the way down the track,second you timing is advanced way to far for a non ported motor,those sidedrafts are known for having a flat spot at around 3,000 rpm,as far as 60' i was running 2.0 on street tires,i made adjusters for the upper links of the rearend to make the instant center farther back,it eliminated any wheel hop,and made the car hook very well,i never got a chance to run it with slicks,but properly done,it should run 1.45-1.50 60' times

How did you make adjusters for the upper links? Any pics? I've heard about the ups and downs on these lightened flywheels and i'm ok with the lag, this car is my "drift/autocross" car and the lightened flywheel works great. I would really like to improve my 60ft time, seems slow to you guys haha
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Old Jan 27, 2008 | 04:18 PM
  #29  
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i did not take any pics of the 4 link mod,but there is a simple way to do it,you can just weld extensions on the rearend where the bottom link bars attach,i made three holes that were very close together to have tunability.
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Old Jan 27, 2008 | 04:58 PM
  #30  
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Originally Posted by pportnosgsl
i did not take any pics of the 4 link mod,but there is a simple way to do it,you can just weld extensions on the rearend where the bottom link bars attach,i made three holes that were very close together to have tunability.
Are you talking about this?


SO I just extend this lower?
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Old Jan 27, 2008 | 05:57 PM
  #31  
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yes,extend the lower mounting point were the bars attach at the axle housing mounting point
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Old Jan 27, 2008 | 05:59 PM
  #32  
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one more thing,if you are auto xing,if you haven't done so yet remove the rear sway bar,it will help the car take a corner much better.
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Old Jan 27, 2008 | 06:01 PM
  #33  
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+1 to those that said tuning. You should be making significantly more power with that carb over the stocker, and if your times are comparable then I'd have to say you're not.
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Old Jan 27, 2008 | 06:28 PM
  #34  
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+1 on avoiding the burnout on street tires. avoid the water altogether. and if you cant avoid the water, spin the tires just long enough to dry them off. and practice the tree. best rule of thumb is when the third yellow gets bright, launch. if you wait for the green, you will be late. if its a pro tree when all three yellows get bright, launch. again, dont wait on the green light. it the tree is lit by the new light emmiting diodes, aka "LED"s", you will have to predict the tree.
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Old Jan 27, 2008 | 06:39 PM
  #35  
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man 16.6 wow thats slow...
i think you just need more practice...my rx7 is almost stock...just a header wide open exhaust and the rats nest gone and i run15.4
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Old Jan 27, 2008 | 07:18 PM
  #36  
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Originally Posted by toyo
man 16.6 wow thats slow...
i think you just need more practice...my rx7 is almost stock...just a header wide open exhaust and the rats nest gone and i run15.4

yeah i know it's slow but i'm gonna work on it. 15.4 sounds really good, are you popping nitrous?!
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Old Jan 27, 2008 | 07:31 PM
  #37  
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Originally Posted by pportnosgsl
yes,extend the lower mounting point were the bars attach at the axle housing mounting point
will do, soon as the check comes in. I also tried removing the rear sway bar before and I didn't like the understeer and the car felt unstable with my locked diff. Thanks for the advice

Originally Posted by djjjr42
+1 to those that said tuning. You should be making significantly more power with that carb over the stocker, and if your times are comparable then I'd have to say you're not.
I'm going to a local race shop today to get several pump and idle jets for the carb, hopefully it'll fix the flat spot on the carb



Originally Posted by 1983GSP
+1 on avoiding the burnout on street tires. avoid the water altogether. and if you cant avoid the water, spin the tires just long enough to dry them off. and practice the tree. best rule of thumb is when the third yellow gets bright, launch. if you wait for the green, you will be late. if its a pro tree when all three yellows get bright, launch. again, dont wait on the green light. it the tree is lit by the new light emmiting diodes, aka "LED"s", you will have to predict the tree.
awesome tip!
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Old Jan 27, 2008 | 07:36 PM
  #38  
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there is no way with a heavy(stock) flywheel you engine will revv quicker than with a lightweight flywheel. it defies physics.
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Old Jan 27, 2008 | 07:44 PM
  #39  
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no man i dont use nos in my 12a...im planning on a 13b rew for next year but no its just the header and exhaust on it now....but there has to be a problem...try a new air filter and some plugs a good tune up you know maybe you can pull a little out of it
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Old Jan 27, 2008 | 10:34 PM
  #40  
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Originally Posted by toyo
man 16.6 wow thats slow...
i think you just need more practice...my rx7 is almost stock...just a header wide open exhaust and the rats nest gone and i run15.4
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Old Jan 28, 2008 | 12:38 AM
  #41  
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Just found out that the pump jets on the oer are different than the ones one the weber DCOE *#@k! Means i have to order it. Bummer
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