Ausmith

SOme of you know that my new (used) Arr came with an LS transmission - found out on the drive home. The folks I bought it from are very nice and willing to work something out in terms of $$$ back to me. They have asked for documentation. I have in turned asked them what type of documentation would satisfy them.

How would document, without tearing the gearbox apart, that the transmission is using LS gearing and not the stock Type R gearing? I could take various pictures of the tach/speedo at different speeds..... Any thoughts?

Reid

If you don't want to/can't take the transmission apart, this is the best option.

ZygSpeed

Some dyno plots!

Along with a copy of one of the hybrid boards tranny charts showing gearing differences.
So, if it's an LS box then there's no LSD either or the stamp on the transmission.

Asahi

what model LS tranny do you have? Y80 or S80? That might help . . . or prove nothing

sackdz

Have a Honda or Acura dealer put it in writing matching serial # etc.

Batoutahell

Send them a video tape. Show the wheel and tire size on your car, then get in and drive around shifting through each of the gears, while videotaping both the tachometer and the speedometer at the same time.

Watch the videotape and make the mathematical calculations of the tranny ratio in each gear. Then, show them that your numbers exactly match the Acura factory spec numbers for the the LS tranny gear ratios.

BABY NSX

Would work if the tach was calibrated properly... But we all know it isn't very acurate. I think a dyno test would be best for determining gear ratios.

Inspect the diff by pulling out the drive shafts and looking through it.

Ausmith

Here is my reply to her request...

Hello Heather,

I appreciate your response. I understand that neither you nor Jamie may not have know about the transmission, and I am very happy to hear that you are empathetic to the situation. I do love the car, no question about that.

What type of documentation would be satisfactory for you? That question really has two parts:
#1 How formal do you want it to be? Acura dealership, some other 3rd party, or coming directly from me.
#2 What exactly are you looking for? Pictures, calculations, descriptions, comparisons, dyno plots... It will, undoubtedly, get somewhat technical and I want to make sure that it is something you can understand.

Can I assume that you are going to have my documentation/justification verified by someone? If that assumption is correct, perhaps we can ask them exactly what they want to see so that what I provide meets their expectations the first time. If we don't manage this well, I could see it taking a lot of time, effort, and money.

Let's discuss the various ways that I could document the situation. Perhaps you can run this by the party that will be verifying the documentation and they can help decide which one meets their expectation:

#1 The ideal way to document the issue would be to compare the internal parts in my transmission to those from a stock Type R, however the labor to remove and disassemble/reassemble the transmission will likely be more than the cost of a new or rebuilt unit. Therefore, I think that is out of the question.

#2 I can have the car put on a chassis dynometer. When dynoing a car the values for the gearing must be put into a computer ahead of time for the results to come out properly. I can have the car dynoed using both values (type R, and LS) and the power and torque results should be off by a good margin when the Type R values are used.

#3 I can show visually that whatever transmission is in the car has been removed and re-installed. I can also show that the transmission has had the identification markings removed. Finally I can show visually that the transmission case itself has been opened up. I believe that this transmission has a Limited Slip Differential (LSD), but I could be wrong. With a little bit of work I can prove this either way. If it does not have an LSD, then we know for sure it is not the correct transmission. The ITR was the only Integra to come with the LSD.

#4 I can show visually the speed of the vehicle compared to the RPM. I can do this by having someone take pictures of the gauges while I drive the car. This is how I noticed something was wrong in the first place. The engine's RPM and gear ratio will determine the speed that the vehicle will travel.

#5 I'm not sure if they will do it, but I can check with the local Acura dealership to see if they are comfortable verifying, without removal and disassembly, that it is not the proper transmission. I doubt they will, but I can check. Another alternative is to have King Motorsports or Realtime Racing do this validation. They are both reputable local shops that have a wealth of experience specifically with the Integra Type R - definitely more than the Acura dealership.

Please advise.

Thanks

Clayton

ZygSpeed

Buy suggesting the dyne, I'd think you'd map wheel speed vs. engine speed, for each of the gears.
Probably one long run or several runs, one in each gear.

Now that I think this out, use a "known good" ITR as a comparison.