Acura Legend Forum banner

Converting my 91 coupe to stick..safe?

1.1K views 13 replies 7 participants last post by  takemorepills  
#1 ·
Just recently change the entire tranny with a manual tranny. Love the performance increase but a bit shakky, does anyone know if this is a good idea?

Legendary one
 
#3 ·
Before you consider "re-engineering" the vehicle, you need to first consider that the VIN will no longer match. This could create many legal problems with your bank (if the vehicle is not wholly owned by you) and with your insurance company (who could cancel your comprehensive as well as deem you and you alone responsible for any accident. The insurer could claim that your "re-engineering" and the resultant change in design contributed/caused the accident). From a bank and insurer standpoint, the "re-engineered" vehicle could also be viewed as a Parts Only vehicle and not worth its loan value nor its insured value. All it would take is one accident in which an appraiser views the vehicle.

For these reasons, it is more prudent to just locate a manual transmission vehicle. They are not rare.

Your post appears to denote that you have already perfomed this conversion and vehicle's driveability is not as it should be. This vibration/wobble or whatever is an unsafe condition and needs to be corrected.
 
#4 ·
Don't hate on modifications!!!!

My insurance company does not care that the tranny is different. Why would they?? What makes swapping a MT into a car any more dangerous than R&R'ing a AT??

My finance company does not care either. Why would they? When a finance company reposses a car, they always look at it as a right-off. Usually a repo car car gets auctioned off for a fraction of the real street value.

My car runs perfect. Sebocypher, what are you trying to say? The topic sounds like a question, but the post sounds like you already did it..........

People that have no initiative to modify their cars are quick to point out all the negative aspects of things. I suggest you ignore them and continue on. The Legend community has self described geniuses that can tell you all kinds of reasons swaps are bad and why one kind of FI is better than another.....despite the fact that there is currently no basis for those arguements.

Let me know if your swap is done and you are having problems, I had to do a few things to get my car running right.
 
#5 ·
Re: Don't hate on modifications!!!!

takemorepills said:
My insurance company does not care that the tranny is different. Why would they?? What makes swapping a MT into a car any more dangerous than R&R'ing a AT??

Call your insurance company and then post what they tell you. If I am wrong, I would like to know it. Ask about liability and who would assume in the event of an accident.

My finance company does not care either. Why would they? When a finance company reposses a car, they always look at it as a right-off. Usually a repo car car gets auctioned off for a fraction of the real street value.

Your bank has loaned money on a vehicle worth X number of dollars...collateral. If you intentionally cause the vehicle to be worth less, they could sue you for the difference.

My car runs perfect. Sebocypher, what are you trying to say? The topic sounds like a question, but the post sounds like you already did it..........

People that have no initiative to modify their cars are quick to point out all the negative aspects of things. I suggest you ignore them and continue on. The Legend community has self described geniuses that can tell you all kinds of reasons swaps are bad and why one kind of FI is better than another.....despite the fact that there is currently no basis for those arguements.

I can only speak for myself and the fact that I owned and modified Muscle Cars in the late 60s and early 70's. I have owned and tweaked Chevy, Ford, and Plymouth vehicles...this includes a Z-28, a NASCAR mustang, Hemi-Cuda and Shelby KR. I am not a genius, but neither have I no experience. I have spent tens of thousands to "improve" vehicles.
As you age, you become more aware of the issue of liability and the desire to keep what you own.

The Legend manual transmission car is not rare by any sense of the imagination. You want one today? Post a thread offering $5 to $8,000 over retail. I can almost guarantee you will have to beat the offers off with a stick.
Or, locate a worn out one and then refurbish. Why place yourself in a position wherein you might be sued for everything you own?

Let me know if your swap is done and you are having problems, I had to do a few things to get my car running right.
[/QUOTE
 
#8 · (Edited)
Re: Don't hate on modifications!!!!

takemorepills said:
My insurance company does not care that the tranny is different. Why would they?? What makes swapping a MT into a car any more dangerous than R&R'ing a AT??

In performing a conversion of this type you are changing the design and the driveability of the vehicle. Even if the work were to be performed professionally, the insurance company could easily state that such a conversion contributed to or caused an accident (how could you refute this?) and hold you, the owner, entirely responsible for any and all damages. There is a significant difference between installing a new or used part which has been designed and engineered for a specfic application, and acting as your own engineer. Surely you must understand this.

I beg to differ as to whether or not your insurer could care less if a converstion were performed. Contact them and ask. Consider this: The insurance company has insured the vehicle for x-dollars, but this is not the major issue. The most important aspect is in terms of property damage and bodily injury. The insurer exists to assign liability. If your insurer were to know that a converstion had taken place (and this is almost guaranteed if an accident occurs and a appraisal is performed) the insurer could immediately cancel the policy and hold you responsible for what might be hundreds of thousands of dollars or more. Most insurers will not provide comprehensive for a salvage titled car, much less one which has been converted and now from an insurer standpoint to be deemed to be a parts only vehicle. What is this vehicle now worth? Is there a market for a converted vehicle? Another issue is when does your liability to this vehicle end? It may not end even if the vehicle is sold.

My finance company does not care either. Why would they? When a finance company reposses a car, they always look at it as a right-off. Usually a repo car car gets auctioned off for a fraction of the real street value.

Your finance company expects to be able to sell a repo at or close to wholesale value. This is not the point. You entered into a contract and the vehicle used as collateral is supposed to be worth x-dollars. The conversion has changed the value of the vehicle. Could this be fraud? Regardless, you will be held responsible for the balance of your loan. What happens when your insurer informs you and the bank that it will reinburse the finance company little or nothing due to the conversion?

Again, the Legend 5 or 6spd is not a rare vehicle. Before I did this I would buy a salvage or two and rebuild/section. At least the VIN would match, liability would be less, and there could be a resale.

The original question is unclear, but appears to be: "I've converted my A/T to M/T and now I experience a "shaking". Is this safe?" The answer is unknown. Only God and the person(s) who performed this conversion know what they did or didn't do and to err on the side of caution would be to state that the symptom could be due to a major problem which would make the vehicle unsafe.

That being said, the owner of this "re-engineered wonder" must now diagnose the problem. Is it driveline related? Fuel related? Is this "shaking" actually that or a vibration? Is it the whole vehicle? Where is the approximate location of this? Does it change or disappear if the vehicle is not under load? Under what circumstances does it occur or cease? Does it occur if the vehicle is at operating temp or just at start-up? Are you sure that every fastener involved in this project has been retorqued at spec? Wiring is correct? Just a few ideas in which to get you started. I would also strongly suggest that you buy a HELM if you don't already have one. This could be of some assistance. The diagnosis of this could prove to be a nightmare.
 
#10 ·
Sebocypher said:
Just recently change the entire tranny with a manual tranny. Love the performance increase but a bit shakky, does anyone know if this is a good idea?

Legendary one
Are some of you guys illiterate? This simple post quoted above this has two sentences, and some of you are asking if the mod was already done?? Ok? And some of you answer his question in an essay, or not even answering it at all.

To answer his question... it depends how shakey it is. It could be from bad tranny mounts to bad CV axle assembly during installment of the axles. But more specific description is needed to know how bad is the problem.
 
#11 ·
Hey LPB, he has a question about his car. Take your free legal advice somewhere else. See, some people try to muddy up the issues with their opinions. I don't care what you say, I am driving my modified car on the street. You can continue to tell yourself and others that doing this is a bad idea, if that makes you feel better. Or, you can just sit back, be quiet and let us play with our cars. What does it matter to you? We already did it, and you forecasting doom will not make us change what we have done, so why say anything????

Sebocypher, the shaking, or shuddering is possibly from 2 sources. The AT ECU does not like the fact that the AT is no longer there. I was getting a mean intermittent misfire about 50% of the time. My car would shudder from 900 rpm to 6000+ RPM, in gear while driving or in neutral. But, in my car, this shuddering would "turn on" or "off" for no apparent reason. Sometimes I would have smooth acceleration, sometimes there would be a slight shudder and a very rich indication on my AF meter, indicating the car was misfiring a very slight amount. If your car has the same symptoms, you will need to install the MT ECU. Have your mechanic consult the Acura/Honda service manual to compare wiring. There are 3 or 4 wires that have different functions from MT to AT, and of course the extra AT connector will not plug into the MT ECU.

Possible cause #2 could be your flywheel is out of balance or you need to change to a MT crank pulley, or both. The MT crank pulley is different from the AT pulley. The flywheel is likely not the cause, however.

Sounds like you experienced the same problem I had. Currently my car runs perfect, I have since jumpered my ECU to think it has a AT and that it is in drive. I forget the wires I did that to, I would just suggest you install the MT ECU.

Good Luck.
 
#14 ·
homemade wrx said:
well what really comes off of the ecu other than the speedsensor....isn't that all the feedback the ECU gets from the tranny..possibly a temp?

How hard was the swap? Was putting in the clutch, pedal and all difficult? and did you have to change the cv/axles/whatevery you wish to call them?
Thanks, Micah
Actually, the ECT in our Legends AND the motor are controlled by a PCM...Powertrain Control Module..basically a ECU and TCU in one box. So, if you get the PCM mad, then everything is fooged up. In a MT Legend, there is just a ECU. You should know this......yah????;)

The pedal assy and other stuff does not go into a AT Legend near as easy as the way it is in a Civic, for example. There are no deletions for MT option, the AT Legend body is actually a different stamping all together. So, there is modification involved. BUT, it is possible, of course. Not that big a deal. There is another forum member finishing the swap.... he will be #2 on this forums with a AT->MT swap. I had to replace the diff, in case you did not know, the Legend has a seperate diff....like a RWD, very rare on FWD cars. I have a coupe drivetrain in my car, it has better gearing than a 5 MT equipped sedan, so it accelerates same as a coupe....about 0.5 secs quicker 0-60 and 1/4 mile than a comparable sedan. Plus, my car is fairly well modified, so I would say it is MUCH faster than 1 year ago. I know you didn't ask, but I like to brag once in a while:D