The Great RX-7 Rally Car Build!!!
Thread Starter
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Joined: Mar 2001
Posts: 171
Likes: 0
From: Twin Cities, MN
OK I just tried Sterling's 10-step on the idle and I can't figure it out. I can get it to idle at 1k (roughly). Maybe 900 with precise adjusting of the two screws, but it's rough either way.
Would not having any vacuum to the leading/trailing advance things on the dizzy contribute to the power loss too?
Would not having any vacuum to the leading/trailing advance things on the dizzy contribute to the power loss too?
OK I just tried Sterling's 10-step on the idle and I can't figure it out. I can get it to idle at 1k (roughly). Maybe 900 with precise adjusting of the two screws, but it's rough either way.
Would not having any vacuum to the leading/trailing advance things on the dizzy contribute to the power loss too?
Would not having any vacuum to the leading/trailing advance things on the dizzy contribute to the power loss too?
Joined: Mar 2009
Posts: 983
Likes: 0
From: Minneapolis, Minnesota
When i timed my engine, i forgot the hook those vac lines back up at first. Couldn't give the car any gas or it would just die. So yes, they are VERY important.
Also, i would REALLY time the motor before you tune it. You won't be able to tell if the "rough idle before it dies" that sterling talks about is a result of the lean mixture or the ignition being too far off.
Also, i would REALLY time the motor before you tune it. You won't be able to tell if the "rough idle before it dies" that sterling talks about is a result of the lean mixture or the ignition being too far off.
Last edited by FunK73; Apr 16, 2010 at 06:59 PM.
Thread Starter
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Joined: Mar 2001
Posts: 171
Likes: 0
From: Twin Cities, MN
NO! 
Because I can't get this car to run right! I have spent hours now trying to get it to run right.
It won't hold idle below 1k. I used Sterling's guide to no avail. The idle is lumpy.
It doesn't have near the power it should. It sounds like it's gasping or gurgling when trying to rev or accelerate over 2500 RPMs. I have adjusted the timing from advanced all the way to retarded and not much difference.
The vent solenoid is vent hole is now uncapped. I ran vac to the vacuum advances for L/T on the dizzy. The teeter-totter is good. I have quadruple checked for vac leaks and spraying starter fluid all around doesn't smooth/raise the idle.
I'm about ready to just give up on this goddamn car!
Because I can't get this car to run right! I have spent hours now trying to get it to run right. It won't hold idle below 1k. I used Sterling's guide to no avail. The idle is lumpy.
It doesn't have near the power it should. It sounds like it's gasping or gurgling when trying to rev or accelerate over 2500 RPMs. I have adjusted the timing from advanced all the way to retarded and not much difference.
The vent solenoid is vent hole is now uncapped. I ran vac to the vacuum advances for L/T on the dizzy. The teeter-totter is good. I have quadruple checked for vac leaks and spraying starter fluid all around doesn't smooth/raise the idle.
I'm about ready to just give up on this goddamn car!
Joined: Mar 2001
Posts: 31,837
Likes: 3,234
From: https://www2.mazda.com/en/100th/
NO! Because I can't get this car to run right! I have spent hours now trying to get it to run right.
It won't hold idle below 1k. I used Sterling's guide to no avail. The idle is lumpy.
It doesn't have near the power it should. It sounds like it's gasping or gurgling when trying to rev or accelerate over 2500 RPMs. I have adjusted the timing from advanced all the way to retarded and not much difference.
The vent solenoid is vent hole is now uncapped. I ran vac to the vacuum advances for L/T on the dizzy. The teeter-totter is good. I have quadruple checked for vac leaks and spraying starter fluid all around doesn't smooth/raise the idle.
I'm about ready to just give up on this goddamn car!
Because I can't get this car to run right! I have spent hours now trying to get it to run right. It won't hold idle below 1k. I used Sterling's guide to no avail. The idle is lumpy.
It doesn't have near the power it should. It sounds like it's gasping or gurgling when trying to rev or accelerate over 2500 RPMs. I have adjusted the timing from advanced all the way to retarded and not much difference.
The vent solenoid is vent hole is now uncapped. I ran vac to the vacuum advances for L/T on the dizzy. The teeter-totter is good. I have quadruple checked for vac leaks and spraying starter fluid all around doesn't smooth/raise the idle.
I'm about ready to just give up on this goddamn car!
Junior Member
Joined: Mar 2010
Posts: 1
Likes: 0
From: Montreal
Hey Dre,
Just wondering which category of group 2 are you planning to enter? Also which rule book are you reading from because the CARS (Canadian) rulebook has some differences to the SCCA rulebook. But that's only if you want to rally in Canada and the US. I'm only wondering because I may be allowed to run a S4/5 13B N/A and tranny in the FB chassis under the CARS rulebook, but i would have to confirm on that with CARS themselves. It may be worth asking SCCA if you are able to do that as well, but it somewhat depends on which category you want to run.
I too am building up a rally car, an 85 GS. I will post some pics when I find the cable to plug my camera into the pc.
keep up the good work, looking forward to seeing the car finished, and hope this helps some,
Chris
Just wondering which category of group 2 are you planning to enter? Also which rule book are you reading from because the CARS (Canadian) rulebook has some differences to the SCCA rulebook. But that's only if you want to rally in Canada and the US. I'm only wondering because I may be allowed to run a S4/5 13B N/A and tranny in the FB chassis under the CARS rulebook, but i would have to confirm on that with CARS themselves. It may be worth asking SCCA if you are able to do that as well, but it somewhat depends on which category you want to run.
I too am building up a rally car, an 85 GS. I will post some pics when I find the cable to plug my camera into the pc.
keep up the good work, looking forward to seeing the car finished, and hope this helps some,
Chris
Thread Starter
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Joined: Mar 2001
Posts: 171
Likes: 0
From: Twin Cities, MN
In the US, there is only one group2. I am running Rally America rules, not SCCA. I am so frustrated trying to get this car running right. Let alone all the work that will come turning it into a racerar!
Is there anyone in MN who knows these carbs inside and out? Like I said, it idles high, lacks power everwhere, and over 2500RPMs (under load) it's like it's struggling to breath or something --sounds like gurgling.
Is there anyone in MN who knows these carbs inside and out? Like I said, it idles high, lacks power everwhere, and over 2500RPMs (under load) it's like it's struggling to breath or something --sounds like gurgling.
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arextu
Joined: Feb 2007
Posts: 97
Likes: 0
From: nanaimo b.c.
Don't give up. I started from the ground up and i'm now on year two of my gsl-se build. Things seem to crap out right when it's almost road worthy... I'm also having a very hard time tuning my holley 650 on my 6-port(overkill?).
I just rebuilt my carb twice. Checked compression. Checked ignition. Checked for vacuum leaks. Happened to put my finger over the hole to the shutter valve and ta da. I found my culprit.
I bet it's low fuel pressure. Need a gauge while you're driving it. And a wideband air/fuel meter. Get data, stop guessing. Have someone rebuild the carb.
Hey Dre,
I just discovered this thread which, so far, has been great!
I'm also working on an FB rally car so it's fun to see other guys out there with these things.
I have noticed that it has been over a year since you've posted an update. Is the project put on major hold? Have you just gotten lazy with updating? Did you give up?
Wishing you luck,
Evan
I just discovered this thread which, so far, has been great!
I'm also working on an FB rally car so it's fun to see other guys out there with these things.
I have noticed that it has been over a year since you've posted an update. Is the project put on major hold? Have you just gotten lazy with updating? Did you give up?
Wishing you luck,
Evan
