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88-91 USDM Crx Differences

Got a problem with your stock CRX? This is where you should start.

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Re: 88-91 USDM Crx Differences

Postby 94eg! » Wed Dec 05, 2012 12:03 pm

Also, aside from the color difference, the 89 Si door panels are easy to spot because they do not have piping around the fabric section with the CRX logo on it. This info could be added to the door panel FAQ too:

Here's an 89 door panel:
Image

Here's a 90-91 door panel:
Image

BTW: I didn't host these pics, I just used the link from the google & ebay. You may want to re-host them if you're going to use them.
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Re: 88-91 USDM Crx Differences

Postby Baker » Wed Dec 05, 2012 4:01 pm

94eg! wrote:Also, aside from the color difference, the 89 Si door panels are easy to spot because they do not have piping around the fabric section with the CRX logo on it.


Subtle difference that I wasn't aware of, good eye!
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Re: 88-91 USDM Crx Differences

Postby 94eg! » Tue Dec 11, 2012 2:55 pm

Another Notable differences:

88-89 Si, 88-91 DX have Akebono style front brake calipers. Pistons are 50.8mm in diameter and get paired with the small 13/16" Master Cylinder. Front Rotors 231mm x 17mm.

90-91 Si have Nissin style front brake calipers. Pistons are 54mm and get paired with a larger 7/8" Master Cylinder. Front rotors are also slightly larger at 242mm x 19mm. Proportioning valve is different too.
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Re: 88-91 USDM Crx Differences

Postby Baker » Tue Dec 11, 2012 4:56 pm

94eg! wrote:Another Notable differences:

88-89 Si, 88-91 DX have Akebono style front brake calipers. Pistons are 50.8mm in diameter and get paired with the small 13/16" Master Cylinder. Front Rotors 231mm x 17mm.

90-91 Si have Nissin style front brake calipers. Pistons are 54mm and get paired with a larger 7/8" Master Cylinder. Front rotors are also slightly larger at 242mm x 19mm. Proportioning valve is different too.


Knowledge gained from first hand experience?
I never realized there was this specific of a difference when it came to these parts.
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Re: 88-91 USDM Crx Differences

Postby 94eg! » Tue Dec 11, 2012 6:26 pm

Check any Honda parts website. You'll see the part number differences. Especially if you start cross references. I own a completely stock 89 Si and was always confused on why all the part numbers didn't match with the 90-91. Everything from the MC, PV, Calipers, etc... This is when I started doing some research and various cross references. Funny thing is you can even see the physical difference in the cutaway drawing of the CRX inside the various brochures. They were quite detailed on those renderings.

I also confirmed with Centric's database, and again it was spot on. They also list specific bore sizes of the pistons & master cylinders as well as complete rotor dimensions. The Nissin style calipers have a subtle visual cue in that they have an obvious bridge connecting the upper & lower pad holder on the outside of the rotor. Kinda like all other Nissin calipers in the Honda lineup (think Integra or Civic EX). The Akebono caliper is just the standard affair found on pretty much all base model civics from 92-00.

88-89 Si & 88-91 DX Akebono front brakes:
Image

90-91 Si Nissin front brakes (behind a 15" rim):
Image
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Re: 88-91 USDM Crx Differences

Postby 94eg! » Tue Dec 11, 2012 7:26 pm

I'm boarded so I'll even give you the Honda parts diagrams... 8)

89 CRX Si Akebono caliper: http://www.hondapartsnow.com/Page_Produ ... %201241117
Image

90 CRX Si Nissin 16CL-13VN caliper: http://www.hondapartsnow.com/Page_Produ ... %201241118
Image
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Re: 88-91 USDM Crx Differences

Postby tyson » Tue Dec 11, 2012 8:25 pm

Baker wrote:
94eg! wrote:Another Notable differences:

88-89 Si, 88-91 DX have Akebono style front brake calipers. Pistons are 50.8mm in diameter and get paired with the small 13/16" Master Cylinder. Front Rotors 231mm x 17mm.

90-91 Si have Nissin style front brake calipers. Pistons are 54mm and get paired with a larger 7/8" Master Cylinder. Front rotors are also slightly larger at 242mm x 19mm. Proportioning valve is different too.


Knowledge gained from first hand experience?
I never realized there was this specific of a difference when it came to these parts.



what? this is CRX 101.

the prop valve is also different.

i measured 53mm piston btw. 54mm might be the caliper bore.

http://www.norcalcrx.org/tyson/pics/brakepartslist.gif
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Re: 88-91 USDM Crx Differences

Postby Baker » Tue Dec 11, 2012 9:23 pm

:-)b
Good info.
I'll update the original post later.
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Re: 88-91 USDM Crx Differences

Postby dreadfully_nappy » Thu Dec 27, 2012 4:09 pm

wow this is awesome info...learned more than i thought i already knew, Thnx!!
It's just a lil d series...i mean how fast could it be ;)

my build/take back to stock thread
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Re: 88-91 USDM Crx Differences

Postby piratew5 » Sun Mar 03, 2013 8:21 am

Great info but a few additions, see post to follow.
Last edited by piratew5 on Sun Mar 03, 2013 8:48 am, edited 1 time in total.
"Good judgment comes from experience, experience comes from bad judgment."

Previous cars:
1989 Red CRX Si
1991 Red CRX Si
1991 White CRX Hf
2011 White Civic Si
1991 White CRX Si ZC DOHC Motor & Hybrid Trans (Given to Son)
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Re: 88-91 USDM Crx Differences

Postby Baker » Sun Mar 03, 2013 8:33 am

piratew5 wrote:Great info but this is not correct for the 91 Hf at least I just sold one and I was there when the orginal owner bought it and it had a passenger side mirror.-no passenger mirror is not correct


The mirror could have easily been added anytime by the dealership.

piratew5 wrote:Also you never mention (or I missed it) that the 91 Si comes standard with rear disc brakes where the 88/89 do not.


You missed it, first two points under "Suspension/Motor/Transmission/Misc. "
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Re: 88-91 USDM Crx Differences

Postby piratew5 » Sun Mar 03, 2013 8:43 am

Great write up with lots of good info.

But the Hf did come with a factory passenger mirror as seen in this photo and the very first photo of this post. It was not added. I was with the owner of the Hf in the picture when he bought the car at West Broad Honda in Richmond Virginia. The Hf also came with much smaller seats to help trim weight. Also the the 49 state Hf came with a green shift arrow in the lower left of the instrument light cluster (see white outline in pic center of the dash). This light comes on at about 1500 rpm in all gears but 5th. I'm the orginal owner of the White Si in the photo and still have the window sticker.

1991 Si Window sticker, Price $11,390.00
Image

91 Hf Dash, note white square in the center of the dash for the (49 state) green shift light. Not on the Ca. cars.
Image

My 91 Si and 91 Hf with Honda Del Sol wheels
Image

My past 91 Si with the stock tear drop wheels
Image

p.s. How do you delete a post...ugh
"Good judgment comes from experience, experience comes from bad judgment."

Previous cars:
1989 Red CRX Si
1991 Red CRX Si
1991 White CRX Hf
2011 White Civic Si
1991 White CRX Si ZC DOHC Motor & Hybrid Trans (Given to Son)
Current Cars:
1996 Honda Del Sol (Stock, so far)
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Re: 88-91 USDM Crx Differences

Postby Baker » Sun Mar 03, 2013 6:48 pm

This was my friends '91 HF that he used simply as a commuter, no RH mirror.
Image

piratew5 wrote:But the Hf did come with a factory passenger mirror as seen in this photo and the very first photo of this post. It was not added.


With a statement such as that, I assume you were there once it rolled off the assembly line in Japan?
The dealership could have easily added it before it went out on the lot, it's not unheard of.
From what I am aware of and have seen, the HF was bare bones economy model and did NOT come standard with a RH mirror.



piratew5 wrote:91 Hf Dash, note white square in the center of the dash for the (49 state) green shift light.
Image


I noticed the sedan wheel, which is not original to the car but see it in the pic, so using your logic, it came with a sedan wheel and cruise as well?
:idea:
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Re: 88-91 USDM Crx Differences

Postby sdjustice89 » Tue Oct 22, 2013 7:02 pm

Thanks for the info, based on what ive read couple years back I bought a DX that the seller claimed to be a HF but I think he just put a D15B6 motor in a DX. Everything else on the car was what you described as a DX. Looking to get a true Stock HF and this has helped a lot. :-)b
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Re: 88-91 USDM Crx Differences

Postby Garco » Sun Dec 29, 2013 10:41 pm

Super great post!!! I just have one correction. Hf did offer a rear wiper, right side mirror and clock. I have two Hf's both bone stock and one has these options and the other does not.
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Re: 88-91 USDM Crx Differences

Postby Baker » Mon Dec 30, 2013 12:12 am

Garco wrote:Super great post!!! I just have one correction. Hf did offer a rear wiper, right side mirror and clock. I have two Hf's both bone stock and one has these options and the other does not.


Clock and right side mirror were optional add on's that are installed fairly easy, either by dealer or special order, it was not standard on the HF. The rear wiper was not an option, if I recall, the HF does not have the wiring run for it from the factory.
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Re: 88-91 USDM Crx Differences

Postby JCCRX1988 » Tue Mar 25, 2014 3:56 pm

I recently bought a right side window regulator for my 91 crx. It said its for my car. Holes won't match up? What do I need???
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Re: 88-91 USDM Crx Differences

Postby Baker » Tue Mar 25, 2014 5:03 pm

JCCRX1988 wrote:I recently bought a right side window regulator for my 91 crx. It said its for my car. Holes won't match up? What do I need???


You probably have pillar mounted belts, so you need a window regulator from a Crx with pillar mounted seat belts.
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Re: 88-91 USDM Crx Differences

Postby 94eg! » Tue Oct 28, 2014 11:39 am

Found out the 88-89 3-spoke steering wheels are ever so slightly different vs the 90-91 the other day. :\

88-89:
Image

91-91:
Image
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Re: 88-91 USDM Crx Differences

Postby bairdandrew77 » Tue Oct 28, 2014 7:05 pm

Subscribed, this is going to be a fun read on my free time
1986 Honda CRX- Sold; 1999 Honda Accord EX- H23A VTEC swap; 1997 Ford F350 crew cab long bed- Sold; 1996 Ford Explorer- Sold; 1989 Honda CRX- minime swap
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Re: 88-91 USDM Crx Differences

Postby mmmmark » Thu Mar 19, 2015 10:59 pm

For the 88-91 CRX SI: What are the different types of throttle bodies, and do they interchange?
That's a very comprehensive resource you have compiled, Baker. Thanks!
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Re: 88-91 USDM Crx Differences

Postby Baker » Fri Mar 20, 2015 11:43 am

mmmmark wrote:For the 88-91 CRX SI: What are the different types of throttle bodies, and do they interchange?


I'm not sure what you're asking, they're all the same for the 88-91 Crx Si.
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Re: 88-91 USDM Crx Differences

Postby jlicrx » Fri Mar 20, 2015 11:51 am

Baker wrote:
mmmmark wrote:For the 88-91 CRX SI: What are the different types of throttle bodies, and do they interchange?


I'm not sure what you're asking, they're all the same for the 88-91 Crx Si.


they are not quite all the same - the 88 had a different dashpot from the 89-91 with 2 vacuum nipples on it - this was because the 88 had firewall mounted dashpot control solenoid for controlling fast idle - 89-91 had a fast idle control valve on the back of the intake manifold, no solenoid on the firewall and the dashpot had only one vacuum connection - they do all bolt onto the manifold
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Re: 88-91 USDM Crx Differences

Postby Baker » Fri Mar 20, 2015 12:28 pm

jlicrx wrote:
Baker wrote:
mmmmark wrote:For the 88-91 CRX SI: What are the different types of throttle bodies, and do they interchange?


I'm not sure what you're asking, they're all the same for the 88-91 Crx Si.


they are not quite all the same - the 88 had a different dashpot from the 89-91 with 2 vacuum nipples on it - this was because the 88 had firewall mounted dashpot control solenoid for controlling fast idle - 89-91 had a fast idle control valve on the back of the intake manifold, no solenoid on the firewall and the dashpot had only one vacuum connection - they do all bolt onto the manifold



I was not aware of that, Good catch!
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Re: 88-91 USDM Crx Differences

Postby Baker » Wed Mar 25, 2015 1:18 pm

Combination switch/Wiper stalks differ by years as well.
88/89 is different than 90/91.

Image
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