I heard if you remove ATTS on SH models you will get a little more HP besides I am tired of my check engine light coming on every time I launch the car at a high RPM.

 

sell it and buy a base model

you will always be carrying the weight and getting the drivetrain loss with the ATTS system on the car.

Next closest thing is a base tranny swap which isn't that simple...you need to fabricate a couple pieces

 

Will i still be getting the drivetrain loss if the ATTS is disabled. I dont think i would sell my car thoug hjust to get rid of about 20 pounds.

 

it's more than 20lbs.

 

you don't figure an active differential is worth 20lbs?

i'd damn near kill for an LSD / ATTS.. hehe.

 

ATTS is not LSD...and yeah it's closer to 100 pounds.

Even if you disable ATTS it's still part of the differential it will still cause the drivetrain loss, the only way is to swap trannies

 

this is not entirely accurate, people with high hp na and turbo have simply taken out the fuse to not endanger the atts system, so if it is not in harms way and "disabled" then it must not be working , and if it is not working, then no power is ever going through it, thus no drivetrain loss.....................i think

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98 blacksh &raquo;</TD></TR><TR><TD CLASS="quote">this is not entirely accurate, people with high hp na and turbo have simply taken out the fuse to not endanger the atts system, so if it is not in harms way and "disabled" then it must not be working , and if it is not working, then no power is ever going through it, thus no drivetrain loss.....................i think</TD></TR></TABLE>

It's part of the differential..how can it suddenly 'gain' power.

Considering Type-SH ludes consistently dyno way less whp, and this is with the wheels driving straight ahead and not turning whatsoever, I don't see how pulling the fuse will magically cause the drivetrain loss to disappear

 

Ok the Type SH weighs exactly 88 pounds more than the base model. 88 pounds is not even a 10th of second difference in the 1/4 mile. Not even close. Also i wouldnt say they Dyno at way less HP than the base model. That is why they have the added horses at the flywheel. To make up for the drivetrain loss.

The END

 

theres more to an SH than just the atts.... has different suspension parts among many other things...

I looked and its an 88 lb difference...

you wont notice the difference in power basically, its a waste of time.

 

It's not so much the WEIGHT it's the DRIVETRAIN LOSS becuase of the ATTS equipped differential.

I've seen consistent dynos of -10whp and pullling a fuse will not fix that

 

key word is "ACTIVE" the system is only active sometimes not all the time, every car and every engine is different, i have seen bases dyno lower than they should be too, doesnt mean anything, and pulling the fuse does change things, the system is dissabled COMPLETELY does not work until that fuse is back in, im not saying that arent heavier they definetly are, but if u pull the fuse and it doesnt not work, and it cannot be damaged, then it is NOT working, thus not spinning , thus not creating drivetrain loss

 

nope, satan's right. atts is part of the driveshaft. there will still be power loss.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98 blacksh &raquo;</TD></TR><TR><TD CLASS="quote">key word is "ACTIVE" the system is only active sometimes not all the time, every car and every engine is different, i have seen bases dyno lower than they should be too, doesnt mean anything, and pulling the fuse does change things, the system is dissabled COMPLETELY does not work until that fuse is back in, im not saying that arent heavier they definetly are, but if u pull the fuse and it doesnt not work, and it cannot be damaged, then it is NOT working, thus not spinning , thus not creating drivetrain loss</TD></TR></TABLE>

buddy seriously do have any clue what you;re talking about? ATTS is part of the differential and is always in motion, just like a quaife LSD is. Just becuase the ATTS is not working, and similarly an LSD does not mean it's not creating drag on the drivetrain. You think the system is completely disconnected from the driveshafts and differential and then when the computer tells it to it just magically 'grabs' the driveshafts and starts to transfer power?

 

no thats not what i think, but the way that i understood it was that it would "freespool" when not engaged? correct? if not then i guess it would turn at the same speed as the rest of the tranny and axles correct? so then in all honesty, wouldnt it have the same drag on the tranny as a lsd? most of the weight is in the casing of the atts system not the internals so i would be unsprung wieght not rotating mass- most of it-..

 

im sure there is drivetrain loss, however i dont know if you could say that the SH's dyno way less. As i recall the SH has slightly more aggressive cams. Either way, i cant imagine it being alot considering there is only a .1 sec diffrence. If you have a base or a SH, i think the prelude is a horrible platform for dragging.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LudeDewd &raquo;</TD></TR><TR><TD CLASS="quote">im sure there is drivetrain loss, however i dont know if you could say that the SH's dyno way less. As i recall the SH has slightly more aggressive cams. Either way, i cant imagine it being alot considering there is only a .1 sec diffrence. If you have a base or a SH, i think the prelude is a horrible platform for dragging. </TD></TR></TABLE>

it doesn't have more agressive cams. It's just a myth.

Seriously guys believe whatever you want...dynos don't lie

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98 blacksh &raquo;</TD></TR><TR><TD CLASS="quote">no thats not what i think, but the way that i understood it was that it would "freespool" when not engaged? correct? if not then i guess it would turn at the same speed as the rest of the tranny and axles correct? so then in all honesty, wouldnt it have the same drag on the tranny as a lsd? most of the weight is in the casing of the atts system not the internals so i would be unsprung wieght not rotating mass- most of it-..</TD></TR></TABLE>

I give up. I'm not going to keep repeatig myself. Dynos don't lie.

 

-10whp loss? I dynoed 181whp with I/H/E/P/VAFC on my SH. I dont think the ATTS sacrificies that much HP. Maybe 3-5, but 10? Man, im looking at 191whp on a base with my set up?

 

and what kind of mods do you have such as: name brand and all ?

The reason i ask is that i got horrible numbers when i dynoed my 97 sh. But i dont have the vafc. My numbers were 161.6 hp and 133.8 torque. Also take into consideration that it was over 90 degrees in the dyno room and i had driven it an hour and a half straight before i had it dynoed, but i dont know if that makes a difference.

when i saw your numbers i was surprised, but it could be that you have the newer model SH...lower mileage etc..

thanks could you give me some info about what y ou have done to your car.

 

VAFC makes a huge difference. My base run before tunning was 169whp, after tunning the VAFC was when i reached 181. The key to the VAFC is DYNO tune. Lots of people just install it and get copies of other peoples settings. You need to tune it to YOUR car.

 

its 87 pounds if i am remembering right

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Revi-Ra &raquo;</TD></TR><TR><TD CLASS="quote">-10whp loss? I dynoed 181whp with I/H/E/P/VAFC on my SH. I dont think the ATTS sacrificies that much HP. Maybe 3-5, but 10? Man, im looking at 191whp on a base with my set up?</TD></TR></TABLE>

it varies. dynos are relative.

 

well satan if the fuse is a 20 amp fuse then that may be good for some hidden power that wire harnesses are known to gobble up . but if its just a 10 amp i would say keep the fuse in.

no, seriously, power transmitted from the differential has to be transfered through the atts unit. whether atts is activated in a corner or not it still has to rotate the gears and clutch packs which causes a drivetrain loss. this loss is usually about 7-10 whp.

and no the sh does not have special cams.

and if you wish to continue to argue this point then argue away to your bedroom door **** because that is the only thing that you are going to convince that youre right.

 

yeah and it's not just ATTS other aftermarket LSDs will have the same issue..a Kaaz or quaife will increase drivetrain loss over an open differential