• Protip: Profile posts are public! Use Conversations to message other members privately. Everyone can see the content of a profile post.

ABS upgrade advice which harness/unit to purchase?

IMS_NA1

IMS_NA1

Experienced Member
Joined
18 October 2009
Messages
590
Location
Vancouver BC
Hi Everyone,

I'm looking to upgrade my ABS unit in my 1991. I'm looking at RFY, KSP and T3TEC wiring harness but I'm unsure on which one to
purchase. Also which module to purchase 2000+ NSX or S2000? Would the harness work with a S2000?

Let me know what you guys think. Any input would be much appreciated.

Regards,
Imran
 
2000+ NSX modulators will not be available until February 2023; given that they aren't reserved already by a few stores such as us or our partners. During the meanwhile it is probably better to go with the S2000 upgrade since the TCS is technically old already and not necessarily needed in some ways.
 
IMS_NA1 said:
Hi Everyone,

I'm looking to upgrade my ABS unit in my 1991. I'm looking at RFY, KSP and T3TEC wiring harness but I'm unsure on which one to
purchase. Also which module to purchase 2000+ NSX or S2000? Would the harness work with a S2000?

Let me know what you guys think. Any input would be much appreciated.

Regards,
Imran
Click to expand...
I would go with the harness that is crimped, not soldered. I believe both KSP and T3TEC are crimped. The AP1 S2000 modulator is nearly as capable as the NSX version. @Big McLargeHuge did some wet skidpad testing with his AP1 setup and it performed well. You will have to re-pin a couple pins on the plug to get the harness to work.
 
Can confirm AP1 ABS module works great! It was $40 off eBay. It would only take about 30 mins to swap over to the NA2 module after the AP1 goes in since it's a bolt-on swap and one pin different for the dash warning light on the ABS connector.

I used the RFY NA2 harness as the cheapest pre-made one available and modded it myself, I'm sure the T3TEC will be even better. RFY is all crimped with some bullet connectors between the included relay and additional connectors to split the interior/exterior halves. I got the ABS swap kit from MITA which was a great help for my RHD car.
 
Is there a thread that clearly explains the ap1 conversion? I found one but it seemed meandering and I was hoping for more of a wiki diy guide. I may not be searching the new site properly…
 
Does anyone know of a supplier that sells just the harness adapter other than SOS? There use to be several suppliers out there, I dont see any right now. Certainly not inclined to spend $600 at SOS!
 
MITA Motorsports said:
Shameless plug.

OEM Honda / Acura NSX 2000+ ABS Upgrade Kit – MITA Motorsports | NSX, S2000, Integra Specialists

www.mitamotorsports.com www.mitamotorsports.com

We moved on from using the RFY harness and now working with T3Tec to providing the best ABS harness available for the ABS upgrade.

With this kit, you won't need to worry about anything. Though it won't be available until February 2023.
Click to expand...
... How do I place my order for the ones coming in February 2023 please... thanks.
 
I wrote up my experiences with the AP1 conversion in my Build thread, it's not really a walkthrough but has pictures of relevant steps and a bunch of links to other's writeups that you can piece together enough info from.

Big McLargeHuge’s 1990 JDM NSX Adventure Thread

I shipped LTL freight through Freightquote which I chose Estes through as the cheapest option, Fedex was somewhat higher cost. Never again with UPS lol. No problem with Estes except I had to call the terminal 3 times to get them to finally get a guy to come pick up the pallet from the dock at my...
www.nsxprime.com www.nsxprime.com
 
Big McLargeHuge said:
I wrote up my experiences with the AP1 conversion in my Build thread, it's not really a walkthrough but has pictures of relevant steps and a bunch of links to other's writeups that you can piece together enough info from.

Big McLargeHuge’s 1990 JDM NSX Adventure Thread

I shipped LTL freight through Freightquote which I chose Estes through as the cheapest option, Fedex was somewhat higher cost. Never again with UPS lol. No problem with Estes except I had to call the terminal 3 times to get them to finally get a guy to come pick up the pallet from the dock at my...
www.nsxprime.com www.nsxprime.com
Click to expand...
Thanks for your input appreciate it!
 
Big McLargeHuge said:
Can confirm AP1 ABS module works great! It was $40 off eBay. It would only take about 30 mins to swap over to the NA2 module after the AP1 goes in since it's a bolt-on swap and one pin different for the dash warning light on the ABS connector.

I used the RFY NA2 harness as the cheapest pre-made one available and modded it myself, I'm sure the T3TEC will be even better. RFY is all crimped with some bullet connectors between the included relay and additional connectors to split the interior/exterior halves. I got the ABS swap kit from MITA which was a great help for my RHD car.
Click to expand...

Hi. If the AP1 S2000 modulator were swapped with a new 2000+ modulator, what is that pin difference and would it be possible to get TCS back (wheel speed sensor info)? Thanks
 
northernexposure said:
Hi. If the AP1 S2000 modulator were swapped with a new 2000+ modulator, what is that pin difference and would it be possible to get TCS back (wheel speed sensor info)? Thanks
Click to expand...
Hey there, if I remember right the TCS has a separate smaller wire harness (in the KSP/RFY harness cases) that connects to the ABS control unit that would have to be installed if that wasn't left in there during the initial S2000 ABS install. In my case, I didn't install the extra harness to save some room. Yours may or may not have the wiring provisions for that already.

The wiring pins should be the same except for the WARN light pin on the large ABS unit black/orange connector. I don't remember which pins to swap to/from but I might've had that info in the build thread I linked above, or you could find it by comparing the S2K/NA2 wiring diagrams. It's only one pin different so that part shouldn't take more than a few mins.
 
covered this in my thread on nsxcb.....

collecting parts for winter project.....

today i received a big box from Isicar in Japan.... http://i1376.photobucket.com/albums/ah32/jonathan1937/NSX%20stuff/ABS%20conversion/WP_20160917_14_26_54_Pro_zps33ysylqe.jpg a BIG box...
www.nsxcb.co.uk

walp goes to pin 11 or 7 depending on the abs unit
 
RYU said:
RFY gets my vote
Click to expand...
RFY's harness shorted out two brand new ABS Modulators of ours on separate occasions that we shipped out to NSX shops.

After we received zero support from Yamamoto and told HQ Engineering and Daisy Auto that it was a install problem and deflected responsibility (the wiring on the harnesses was off on those ones that fried the modulators. Pins were wrong), we ultimately partnered up with T3TEC instead for a more superior harness.
 

Similar threads

B
The Ultimate ABS Solution for the NSX
2
Replies
34
Views
2K
blaketjones
B
Chris_Lum
DIY: OEM 00+ ABS Upgrade (SOS Version) (91-99)
Replies
0
Views
155
Chris_Lum
Chris_Lum
Hugh
  • Locked
Brakes **SOLD** BNIB Mita NSX 2000+ ABS Upgrade Kit (No Longer Available From Mita)
2
Replies
27
Views
3K
Hugh
Hugh
O
Feedback on headless audio system plan
Replies
21
Views
1K
drew
drew
CPS996
Resurrecting a 91 w/32,000 miles on thats been in storage for 15 years.
Replies
8
Views
497
drew
drew
Back
Top