EDIT: The answer to this question has been copied into the end of this initial post. Look for the red heading.

The good news: It's possible to come up with a definitive answer to that question.

The bad news: It's going to take a bit of computer skills and a lot of time.

The background:

Between a previously posted letter and personal contacts, several of us have heard an answer to this question from folks at American Honda, that the numbers sold for model years '97, '98, '00, and '01 were 318, 1023, 1347, and 1157, respectively, for a total of 3,845 ITRs. But some folks here have been looking for documented proof of those numbers, beyond that already available. It is now possible to get such proof. Here's how.

Every ITR sold in the United States has a VIN (vehicle identification number) in the format JH4DC231cySnnnnnn where:

c is a check digit, calculated as shown on this web page, where it says "What is a Check Digit and how is it calculated?" (The examples and information shown are for NSXs, but the calculation itself applies to ITRs as well)

y designates the model year of the car (V=1997, W=1998, Y=2000, and 1=2001)

nnnnnn is a sequential numbering of the cars produced (that does not have ANY relationship to the ITR numbers on the armrests)

Therefore, it is possible to use a computer to calculate the check digit, and therefore the VIN, for all possible VINs for ITRs sold in the United States.

It is also possible to take each VIN and verify whether it was or was not ever a valid VIN for an ITR, by entering it into the "My Acura" section of Acura's website. The website will indicate whether or not it is a valid VIN, and if so, will also indicate the color of the car. If someone does this, he can compile a list of all valid VINs of every ITR sold in the United States, and identify the color of each one. This will give us a total number of ITRs and a breakdown by color.

The problem in doing so is that this process involves entering thousands of VINs into the website to verify which ones were actually ITRs. This will require a fair amount of work. In fact, it might be so much work that it's impractical; I don't know. More specifically, I don't know how high the VIN sequence number (that nnnnnn part of the VIN) goes each year. If there was one VIN sequence for all Integra versions, including two and four doors, GS-R and SE and LS and GS as well as ITRs, there may be so many possible VINs to check that it's impractical to check all of them. (Integras were selling at a rate of approximately 40,000 cars a year in the States when the ITR first came out in 1997, although that figure dropped to around 14,000 a year by 2001, as shown in the figures here; note that those figures show sales by calendar year rather than model year.) But if the ITRs were only produced in a small number of "runs" during the manufacturing process, it might be feasible to check only the ranges of VIN numbers in and around those runs, so that only a few thousand VINs for each year would need to be checked instead of tens of thousands. Unfortunately, I don't have any idea how to go about isolating which portions of the sequence number series would contain all the ITRs. EDIT - since originally writing this post, I found out that there are four sequences of USM Integra VIN numbers each year, and exactly how high they go for each year's sequence for manual hatches. See this later post in this topic for details.

If this sounds too complicated and impossible, it's not. Someone on NSXprime went through exactly this process to determine the VINs of NSXs sold in the U.S. in recent years, identifying each one by color, transmission, and body style. Granted, it was easier with NSXs because it was only a few hundred each year, all using one sequence of VINs with no non-NSXs mixed in, so there were only a few hundred to check without having thousands of GS-R or LS Integras mixed in (and again, I don't know whether or not that's the case with the VIN sequence numbers used for the ITR). But still, if it's possible for someone to do that with the NSXs, it's possible for someone to do that with the ITRs.

Maybe there is someone here (or several someones here) who might be interested in taking this on. Someone with the computer skills to program the algorithm to calculate the check digit for each possible VIN, and someone to spend the time entering the list of possible VINs into Acura's website to verify which ones were sold as ITRs (and find out the color of each).

EDIT - Added bolded sentences above.
EDIT - Added the answer below.

andyt posted the following answer to this question on page 5 of this topic. Here is a copy of that post:

Quote, originally posted by andyt »

Ok, here are the answers. Total USDM ITR Production by Year (numbers in parens are the previously accepted totals) 1997 320 (318) 320 CW (100%) 1998 1002 (1023) 1002 CW (100%) 2000 1355 (1347) 573 FBP (42%) 782 PY (58%) 2001 1173 (1157) 523 NBP (45%) 650 PY (55%) Grand Totals by Color 3850 Total 1322 CW (34%) 1432 PY (37%) 1096 *BP (29%) 573 FBP (15%) 523 NBP (14%) ITR Production Sequence Number Ranges by Year 1997 002516 - 002519 002819 - 002832 002835 - 002849 002861 - 002925 002927 - 002966 002970 - 003029 003037 - 003056 003066 - 003127 004247 - 004286 1998 000002 - 000003 002024 - 002071 002091 - 002114 002178 - 002225 002310 - 002333 002358 - 002381 002383 - 002406 002411 - 002433 002494 - 002516 002518 - 002540 002608 - 002630 002674 - 002721 002746 - 002769 002801 - 002824 002861 - 002884 002912 - 002935 002972 - 002995 002998 - 003021 003051 - 003074 003106 - 003125 003185 - 003205 003230 - 003250 003283 - 003287 003343 - 003363 003395 - 003402 003425 - 003431 003450 - 003471 003503 - 003524 003556 - 003577 003606 - 003627 003683 - 003699 003735 - 003756 003822 - 003830 003849 - 003870 003906 - 003921 003976 - 003998 004018 - 004026 004067 - 004075 004105 - 004113 004158 - 004166 004215 - 004223 004272 - 004291 004326 - 004335 004349 - 004358 004386 - 004395 004450 - 004469 004523 - 004532 004549 - 004558 004584 - 004593 004614 - 004622 004639 - 004647 004681 - 004689 004726 - 004734 004777 - 004785 004817 - 004826 2000 000929 - 000931 001163 - 001185 001200 - 001245 001276 - 001298 001323 - 001346 001369 - 001392 001408 - 001451 001481 - 001504 001518 - 001541 001557 - 001579 001602 - 001625 001647 - 001649 001663 - 001666 001679 - 001682 001692 - 001695 001709 - 001712 001719 - 001720 001725 - 001732 001740 - 001744 001752 - 001756 001762 - 001771 001773 - 001776 001791 - 001794 001806 - 001809 001824 - 001827 001866 - 001868 001895 - 001897 001911 - 001913 001935 - 001939 001983 - 001990 002021 - 002024 002065 - 002068 002100 - 002102 002167 - 002169 002208 - 002210 002233 - 002235 002302 - 002305 002345 - 002347 002361 - 002364 002416 - 002419 002461 - 002464 002501 - 002504 002550 - 002553 002582 - 002585 002605 - 002607 002675 - 002677 002716 - 002718 002757 - 002759 002771 - 002773 002804 - 002841 002843 - 002879 002893 - 002911 002920 - 002938 002964 - 002982 003020 - 003038 003074 - 003092 003109 - 003127 003132 - 003150 003183 - 003201 003228 - 003246 003266 - 003284 003302 - 003334 003361 - 003379 003865 - 003900 003946 - 003972 003989 - 004000 004052 - 004063 004096 - 004107 004153 - 004164 004204 - 004215 004231 - 004242 004281 - 004293 004334 - 004346 004362 - 004374 004389 - 004401 004419 - 004431 004443 - 004464 004466 - 004476 004513 - 004533 004536 - 004559 004590 - 004601 004627 - 004638 004662 - 004673 004682 - 004705 004712 - 004723 004738 - 004749 004765 - 004776 004786 - 004807 004831 - 004833 004840 - 004840 004856 - 004864 004900 - 004908 004936 - 004944 004964 - 004972 004999 - 005007 005030 - 005038 005067 - 005075 005100 - 005108 005116 - 005124 005158 - 005166 005222 - 005231 005245 - 005254 005265 - 005283 005295 - 005321 005325 - 005344 005379 - 005389 005429 - 005440 006891 - 006894 2001 000001 - 000094 000111 - 000135 000144 - 000174 000178 - 000222 000303 - 000346 000352 - 000386 000487 - 000530 000600 - 000634 000686 - 000691 000789 - 000789 000808 - 000858 000892 - 000892 000924 - 000953 001019 - 001086 001101 - 001150 001221 - 001279 001303 - 001322 001428 - 001453 001586 - 001630 001683 - 001719 001722 - 001808 001825 - 001887 001917 - 001941 001955 - 001989 002084 - 002105 002154 - 002182 002197 - 002222 002340 - 002367 002498 - 002520 002529 - 002556 002633 - 002688 003622 - 003625 All Known USDM ITR VINs and Info *See next post(s) for each year Argh...Too much data, it needs a web home I think.

Modified by nsxtasy at 8:53 PM 1/20/2006

Modified by nsxtasy at 8:54 PM 1/20/2006

Modified by nsxtasy at 6:43 PM 6/29/2008

Quote, originally posted by RTW DC2R »

yeah, good luck with that

I'm curious, but not enough to go through that. Maybe Mike DiCarlo can find a way to do it with a measure of automation.

This might make it a little easier to firgure out an itr vin from another integra.. I think you left this part out in your post, if I read it right or wrong.. Still sleeping

According to my 97 and 98 helms:

JH4DC231cySnnnnnn

1=Vechile Grade
1=Type R
4=RS
5=LS
6=LS with moonroof
7=GS
8=GS-R

So all you really need to do is start with 00001 and work your way up.

I can do all the 97 ITR's

Rene M might be able to help with it. I remember seeing that he's a M.E. graduate so he's already done with all the courses like that.

No, you misunderstood.

We know the format of the ITR VINs. However, if the last six digits are mixed in the same sequence with all the other Integras, you would have to try all of the numbers in the sequence (as many as 40,000) to find out which ones were ITRs and which ones didn't exist (because the last six digits were used on a GS-R or an LS).

IOW, I don't know whether or not the ITRs were numbered consecutively as 000001, 000002, etc. I don't think so, based on my own VIN.

Just wondering how you came up with 40,000? I would think that if its a 6 digit number with 10 possibilities for each place (0-9) that there would be 10^6 possible combinations (aka ALOT)

Quote, originally posted by 1GreyTeg »

Sounds like a job that would keep Bbasso busy and out of trouble for some time

Hahahaha...

Well since some of us have lotsa free time...

On a serious note hows the job prospects coming along Ry?

Quote, originally posted by canuckr »

Still sleeping

As always.

jOOr like the only guy I know who is pretty much still sleeping going into his first session. Quick but still sleeping

Quote, originally posted by tommymoose »

Just wondering how you came up with 40,000? I would think that if its a 6 digit number with 10 possibilities for each place (0-9) that there would be 10^6 possible combinations (aka ALOT)

They start with 000001 and they increment by 1 from there, and they start over each year. I'm pretty sure they have a different sequence for each model, so that you have NSXs numbered 000001, 000002, etc, and Integras numbered 000001, 000002, etc. (I'm just not sure that there is only one sequence for ALL Integras, or if they have one sequence for ITRs and a separate sequence for other models, or one sequence for two-door Integras and a separate sequence for four-doors, etc.) At worst, this means that if they have one sequence for ALL Integras, and they sold 40,000 Integras in a year (like they did in 1997), then the highest sequence number would be 040000, and nothing higher. Just like with NSXs, where they sell 200 in a year and the highest sequence number is 000200.

Yea I did misunderstand..My bad..

So far I have found 97 ITR's listed from 002891 to 003026.

Also created an excel page to determine check numbers (just enter the last few digits), but for some reason I can not get the right check number..

NM found it.


Modified by andyt at 11:44 AM 1/14/2006

I just created an Excel spreadsheet to provide the first 40 thousand VINS of each year. Anyone wanna spend some time testing? lol

I was going to post the spreadsheet but I figured some paranoid fool would cry about ITR thieves being able to steal more ITRs now.

Then I was going to say expletive it, but it's a 66mb excel file lol

12mb zipped. I am uploading it but I gotta go so if people really can't figure it out i'll post it later. I'll IM Ken the link in case he wants to post it in a bit.

KENJI - Thanks man!

|| Kenji's ECUs and Harnesses!! || ITRCA! ||

FS: 2006 Grand Prix White S2000, ~16,600 miles, PM me for info

"Economical driving is defeatist and boring and unbecoming of anyone who enjoys cars." -James May

That's not how you generate the check digit (I read that to mean that you are using just the last digits to generate the check, I may have misread but read on anyways), it's just like any other check digit (credit card, bank scanline, etc), different methods/weights, but the same thing in the end.

In this case you convert letters for numbers, multiple by the weight, then add it to the rest.

For example, for the VIN: JH4DC23141S000001 (2001 possible ITR, seq number 1)

your formula is:
J-H-4-D-C-2-3-1
8+56+24+20+12+6+6+10

that part will never change (for an ITR), so no need to go into detail.

next add the year, which is the alpha converted to number, or number multipled by it's weight, the weight for this position is 9, so 2001 is 1*9, 1997 is a V, which converts to 5, so 5*9=45 (just to show a conversion).

Anyways back to the VIN at hand, a 2001.
so 1*9=9 so +9

now the S is constant so +16

so now we are at:
8+56+24+20+12+6+6+10+9+16

Now for the rest of the series, the weights go 7, 6, 5, 4, 3, 2.

So in the case of 000001 we have ((0*7)+(0*6)+(0*5)+(0*4)+(0*3)+(1*2) or basically +0+0+0+0+0+2

sooo...

8+56+24+20+12+6+6+10+9+16+0+0+0+0+0+2

is the base number for the check digit, now we sum them to get: 169

Now we do a mod 11 on that value, a mod is basically the remainer of a division of a number by another number (11 in this case. So, 169/11 = 15 with a remainder of 4, so the check digit is 4.

Now it is entirely possible that I f$cked up on one of those numbers, but it worked for my GSR VIN. (with DC239 of course) After checking it once I didn't recheck so if there's a mistake, oh well live with it.

KENJI - Thanks man!

|| Kenji's ECUs and Harnesses!! || ITRCA! ||

FS: 2006 Grand Prix White S2000, ~16,600 miles, PM me for info

doesn't matter, the Integra line is numbers as a series, so you still have to check 000001 through 040000. There won't be a 000001 LS and a 000001 GSR.

KENJI - Thanks man!

|| Kenji's ECUs and Harnesses!! || ITRCA! ||

FS: 2006 Grand Prix White S2000, ~16,600 miles, PM me for info

Quote, originally posted by Moemers »

Had i made a thread about getting laid you better [freak]ing go buy lottery tickets.

Watashi wa nihonjin no onnano ko ga daisku ki!!!

Quote, originally posted by Haleiwa-Brando »

Not speaking on the behalf of Brad, but he's a pretty smart whip when it comes to computers and what not. Maybe we can get him to help out and write a program.

Getting the numbers isn't hard (in fact, it's already done), do a POST to acura's server to check and pull the returns isn't the most complicated (depending on how that vin lookup works anyways).. convincing acura that a flood of 200,000 hits being generated from your server isn't an attack against them might be...

You'd have to break it into MUCH smaller groups. Seems like a lot of work for not too much value.

I'm reuploaded that ZIP Ken, I forgot the S in my concat so I added it...

KENJI - Thanks man!

|| Kenji's ECUs and Harnesses!! || ITRCA! ||

FS: 2006 Grand Prix White S2000, ~16,600 miles, PM me for info

Quote, originally posted by Moemers »

Had i made a thread about getting laid you better [freak]ing go buy lottery tickets.

Watashi wa nihonjin no onnano ko ga daisku ki!!!

Oh, my. All these years and we have only now just discovered God's Only Total Nerd amongst us.

It's here, a zipped Excel spreadsheet with separate worksheets for each year. (Don't ask me why Dave included one for 1999. )

12 Mb zipped, 67 Mb unzipped.