those with ACPT DS, question for ya - Page 2

**nhsilversti** · 09-14-2006, 10:32 PM

Quote:

Originally Posted by Pitcherman

That's because no one has said it....in this tread anyway

***Nivek*** · 09-15-2006, 08:49 AM

Just ruling out some questions here:

Have you owned your car since it was new?

Never been in an accident?

**nhsilversti** · 09-15-2006, 10:02 AM

Quote:

Originally Posted by Nivek

Just ruling out some questions here:

Have you owned your car since it was new?

Never been in an accident?

kevin, i know you are to busy to follow all the details but, yes from new. i did have an argument with a railroad tie once, thats why i double checked by having the car put on a frame machine. that all checked out ok.

that info was also stated in one or more of the above links above. im NOT trying to bust your balls saying that.

there are only 2 things left it could be. 1 is the balance of the shaft and my car being super sensitive or 2. to much driveline rotational mass removed. NEITHER HAVE BEEN PROVEN UP TO THIS POINT.

the purpose of this thread was to see IF anyone has the same setup working in their car. again as of now, no one had spoke up. as in the OP i/we are grasping at straws. i have literally spent well over 1500.00 in trying to figure this out. between the new sub frames, frame machine, driveline shop, and if you factor into it the money spent on transmission work add 9k.

ted

Ver7wannabe · 09-15-2006, 10:14 AM

Have you checked Nasioc? I know on WRXs removing too much rotational weight can be a problem but I have only read about flywheels being too light causing misfire codes not vibrations.

Out of curiosity, how much weight have you removed total?

grim09 · 09-15-2006, 11:17 AM

Ted,

I have spoken to multiple engineers here at work and they all tell me that the lighter the better when it comes to rotational mass. They told me that even if you remove most all the rotational mass in the car it would not be a problem. So this is not going to be your problem. There are alot of rotational parts in a car that could cause a vibration. Since you have tried the driveshaft in another car and it worked perfectly, this would logically eliminate the driveshaft. I know you have put in a lot of time, effort and money in figuring out what the problem is. I hope once ACPT sends you a new driveshaft, this problem will be resolved.

**nhsilversti** · 09-15-2006, 12:49 PM

Quote:

Originally Posted by grim09

Ted,

I have spoken to multiple engineers here at work and they all tell me that the lighter the better when it comes to rotational mass. They told me that even if you remove most all the rotational mass in the car it would not be a problem. So this is not going to be your problem. There are alot of rotational parts in a car that could cause a vibration. Since you have tried the driveshaft in another car and it worked perfectly, this would logically eliminate the driveshaft. I know you have put in a lot of time, effort and money in figuring out what the problem is. I hope once ACPT sends you a new driveshaft, this problem will be resolved.

this is the 2nd shaft AND the who knows for sure the X time its been back to acpt.

the problem seems to be with my car not the driveshaft. now that being said, still no one has this comb or has spoken up about it.

Ver7wannabe - about 35lbs total with the DS installed. this is in the direct driveline only, beyond the diffs would not have ANY negative effects. again i am not claiming i have to much weight removed, rather trying to disprove it.

ted

Fogrider · 09-15-2006, 01:18 PM

Hope that I am not repeating something you have already tried, but have you tried it with the stock pulley instead of the lightened one? Also, are you running the stock belt or one of the super-stiff-and-tough ones?
(good luck)

**nhsilversti** · 09-15-2006, 02:47 PM

Quote:

Originally Posted by Fogrider

Hope that I am not repeating something you have already tried, but have you tried it with the stock pulley instead of the lightened one? Also, are you running the stock belt or one of the super-stiff-and-tough ones?
(good luck)

as of right now i have not tried the stock pulley, ill have to wait to get the DS back again first. the timing belt should have nothing to do with it but, it is the oem one(not original but oem)

Fogrider · 09-16-2006, 12:37 PM

Quote:

Originally Posted by nhsilversti

as of right now i have not tried the stock pulley, ill have to wait to get the DS back again first. the timing belt should have nothing to do with it but, it is the oem one(not original but oem)

My suggestion to try the stock pulley was influenced by the NASIOC pulley FAQ:
http://forums.nasioc.com/forums/show...hreadid=444518
especially the question raised by post #12 and the general "fix" offered in post #1.
My question about the belt was based on my concern that some kind of superposition harmonic could be contributed to by the presence of a stiffer, less damping belt (that would probably have a different harmonic than OEM.)
Your patience with this problem is impressive and I can only imagine the frustration you have dealt with. I hope this problem is soon resolved.
GL!

**nhsilversti** · 09-16-2006, 08:11 PM

the above is just 1 more thing i can try when i get the DS back and reinstalled. all i know is the DS is going for an aerospace tolerance balancing. what is that you may ask? it will be balanced as perfect as humanly possible.

once again time will tell

ted

BrewPubeaver · 09-17-2006, 09:47 AM

i would second the stock pulley idea.

first by proccess of elimintation.

then, for ease of tune. it is pretty common for cars with lighter pulleis to have some issues while tuning. a major tuner shouldnt have any issues getting the tune right under dyno conditions.

just my .02

**nhsilversti** · 09-17-2006, 10:10 AM

Quote:

Originally Posted by BrewPubeaver

i would second the stock pulley idea.

first by proccess of elimintation.

then, for ease of tune. it is pretty common for cars with lighter pulleis to have some issues while tuning. a major tuner shouldnt have any issues getting the tune right under dyno conditions.

just my .02

forget about the tuning issues, i use 1 of the very best in north america.

now that i know soneone is using the clutch and ds without problems, i will try it as one of the next steps after i reinstall it.

now if someone would post that they do have this combo working i can rule out being to light.

BrewPubeaver · 09-18-2006, 08:10 AM

who is tuning you, just curious is it TDC?

**nhsilversti** · 09-18-2006, 09:24 AM

not it is not tdc.

i use the guy who wrote part of the ecutek manual. he did work for a race/tuning shop for a couple of years. then very recently went out on his own to support the tuning needs of race teams. he tunes top rally cars as well as the scca's subaru contingents (they are expected to take the whole podium this year)......

i am not using names at the moment because he is really only working with the race teams right at the moment.

it wont take long for anyone to figure this out.

BrewPubeaver · 09-18-2006, 10:07 AM

lol, got yea. he is great.

when will you get the DS back?

09-18-2006, 10:07 AM	#30
BrewPubeaver S204 Racer Car: 89 GT-R32 Fav Mod: no brake fade Location: Portland OR Posts: 2,647 IWSTI Addict since: Aug 2005 Trader Rating: (2)	lol, got yea. he is great. when will you get the DS back? This ad is not endorsed by this member. Please register or login to hide this ad.

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09-15-2006, 08:49 AM	#17
*Nivek* www.Subie.tv is niiice Posts: 10,066 IWSTI Addict since: Aug 2003 Trader Rating: (10)	Just ruling out some questions here: Have you owned your car since it was new? Never been in an accident?

09-15-2006, 10:14 AM	#19
Ver7wannabe Spec C Club Car: Bugeyes forever! Location: CT Posts: 1,016 IWSTI Addict since: Apr 2004 Trader Rating: (0)	Have you checked Nasioc? I know on WRXs removing too much rotational weight can be a problem but I have only read about flywheels being too light causing misfire codes not vibrations. Out of curiosity, how much weight have you removed total?

09-15-2006, 11:17 AM	#20
grim09 STI Driver Posts: 286 IWSTI Addict since: Feb 2006 Trader Rating: (3)	Ted, I have spoken to multiple engineers here at work and they all tell me that the lighter the better when it comes to rotational mass. They told me that even if you remove most all the rotational mass in the car it would not be a problem. So this is not going to be your problem. There are alot of rotational parts in a car that could cause a vibration. Since you have tried the driveshaft in another car and it worked perfectly, this would logically eliminate the driveshaft. I know you have put in a lot of time, effort and money in figuring out what the problem is. I hope once ACPT sends you a new driveshaft, this problem will be resolved.

09-15-2006, 01:18 PM	#22
Fogrider Amateur STI Driver Car: 04 WRB STi Fav Mod: Driving Schools Location: Bedford, NH Posts: 20 IWSTI Addict since: Sep 2006 Trader Rating: (0)	Hope that I am not repeating something you have already tried, but have you tried it with the stock pulley instead of the lightened one? Also, are you running the stock belt or one of the super-stiff-and-tough ones? (good luck)

09-16-2006, 08:11 PM	#25
nhsilversti Gold Member Car: 06 cgm sti w/ppg dog Fav Mod: RIP 04 psm sti Location: southern nh Posts: 450 IWSTI Addict since: Sep 2003 Trader Rating: (0)	the above is just 1 more thing i can try when i get the DS back and reinstalled. all i know is the DS is going for an aerospace tolerance balancing. what is that you may ask? it will be balanced as perfect as humanly possible. once again time will tell ted

09-17-2006, 09:47 AM	#26
BrewPubeaver S204 Racer Car: 89 GT-R32 Fav Mod: no brake fade Location: Portland OR Posts: 2,647 IWSTI Addict since: Aug 2005 Trader Rating: (2)	i would second the stock pulley idea. first by proccess of elimintation. then, for ease of tune. it is pretty common for cars with lighter pulleis to have some issues while tuning. a major tuner shouldnt have any issues getting the tune right under dyno conditions. just my .02

09-18-2006, 08:10 AM	#28
BrewPubeaver S204 Racer Car: 89 GT-R32 Fav Mod: no brake fade Location: Portland OR Posts: 2,647 IWSTI Addict since: Aug 2005 Trader Rating: (2)	who is tuning you, just curious is it TDC?

09-18-2006, 09:24 AM	#29
nhsilversti Gold Member Car: 06 cgm sti w/ppg dog Fav Mod: RIP 04 psm sti Location: southern nh Posts: 450 IWSTI Addict since: Sep 2003 Trader Rating: (0)	not it is not tdc. i use the guy who wrote part of the ecutek manual. he did work for a race/tuning shop for a couple of years. then very recently went out on his own to support the tuning needs of race teams. he tunes top rally cars as well as the scca's subaru contingents (they are expected to take the whole podium this year)...... i am not using names at the moment because he is really only working with the race teams right at the moment. it wont take long for anyone to figure this out.