auto to manual for 2grand

[Slide]

Is that because they didnt bother?

[SuAvE-1]

i'm no expert, but my transmission guy reckons that there is some power-train loss with almost all automatic gearboxes.

I've heard this is almost non-existent with auto 300zx's. 40% is a bit much, i hear its about 5-10% depending on the car. There might be one car out there with a 40% loss, but i doubt its a skyline.

My previous car was a series 4 auto, it was noticeably slower than my friends manual series 4, although, the fact that my gear changes were very fast benefitted me a lot.

Good luck with your conversion. I only hope it was done properly so u don't have to keep having your car in shop all the time!

[predator]

I have a feeling it may be a bit of a myth based on some older cars losing massive amounts due to auto. You have to account for a different final drive ratio at the wheels as well.

Most autos I have seen have been at *most* (when tuned) within about 10% of car with same mods, if not same.

[bazr33]

well i'll keep yas updated, with quarter times and i'll do a power run, with a bit of a tune

as when i put the manual i had to lower the idle speed, to compensate for the auto's idle.

and i think APC tweaked my standard ecu abit and the timing, so i'll get it checked out and see if its right.

but im pretty happy with the conversion, there was some little bits he missed, with puttin wires back in there position, and dangling wires .

Everything works dash, lights, speedo, and havent heard any whines , or crunchin of gears.

goes good. But as i said there is a noticable difference in power from the auto.

Who knows my auto could of been worned and tired.

[knore]

So its definately an rb25det 5spd gearbox?

I wanna know how they are making any money off it when a descent box is around 1500 and same with a good clutch :confused:

thats 3k without any of the other little bits

[Ruffels]

its funny that no one has made mention of the driver

allmost any idiot can drive a manual,... and an auto for that fact... but its how well you can drive it

1/4mile times depend alot on the skills of the driver aswell as the performance of the car

yet everyone is saying autos are slower then manuals, and vice versa

hmm

-Ruffels

[esprit]

So its definately an rb25det 5spd gearbox?

I wanna know how they are making any money off it when a descent box is around 1500 and same with a good clutch  :confused:  

thats 3k without any of the other little bits

I'm going to ask these guys how much for an RB20DET manual converison If they can do an RB25DET one for $2500 with the gearbox being worth so much, an RB20DET one should be about $1700 or less!

[bahamaskyline]

Drivetrain loss for a manual is between 18-20%. Drivetrain loss for an auto is around 25%. Also, $2000 is a great price for a 5 speed conversion!

[Slide]

Auto with a shift kit id say would be close enough to say the power would be the same.

[predator]

How is a shift kit going to change the actual power output lost in the gearbox?

[Slide]

the time it takes to change gears with an auto power is lost.

With a shift kit power would move faster as gears are changing faster.

when i put in a shift kit the changes through the gears were alot faster and gave a better 1/4 time thinking about it now though the actual power probably would not increase but the time it takes to get the power to the ground is shorter.

before the shift kit there was always a small hollow spot between gears now every time gears changes it pulls into the next gear with no loss of power unlike it used to.

im not an automatic transmission mechanic so i couldnt say about if there was an actuall power increase but id say that the amount of power lost in the transition is a lot less.

[predator]

between changes yeah.. I was more talking about a dyno reading which is just done in the one gear.. Shift kit wouldn't change the power there I wouldn't have thought?

[Slide]

Nah it didnt do anything on the dyno

But with the change of power to the shifts thats the power gain i were getting at compared to what a manual would lose they'd be very similar one would think now.

The best thing about autos though is no paying for clutches

[4door_Sleeper]

A shift kit won’t change the final rwkw, but it will shift a lot quicker than a manual. Old autos lost much of their power (compared to a manual) because the torque converter never fully locked up with the flywheel (there was always some slippage as fluid was pumped through the torque converter) modern autos however do lock up (manually) as the 2 speeds get close together, which reduces much of the difference between the two.

I agree however that an auto should be a few rwkw down if a manual was put into the same car (but we aren’t talking a lot of kw). The other thing to consider is that an auto increases an engines torque (which is more important than kw anyway).

When you also consider:

1. The speed it can change gears - faster than a manual ever will (after the shift kit is installed)

2. An auto is easy to cruise in and copes well with bumper-to-bumper traffic

3. You don’t stall at the lights because the clutch has very little feel (most embarrassing)

4. The cost to overhaul is chicken feed compared to replacing a 3-plate carbon fibre clutch (or any other clutch for high power uses)

5. It leaves your left arm free to play with your girlfriend in the front seat

Unless you are looking at a track application an auto is better in almost every way, and only then until a 6 speed auto is available for the skylines.

[Sumo]

Meh

Looks like everyone will be running out to do a manual to auto conversion after that conversation in here.

Ill stick to my tire burning 5 speed thanks.

Cheers

Sumo

[Slide]

Theres always 1

[B0oStEr]

Have these guys got the bits to do another one at that price?

[Cillham]

i went from auto to manual i had front pipe done

went from 113 rwkw to 120

if that helps

here is no about about it, there is a loss, and i for one felt that when i drove it out the mechanics. big smile on my face- it adds another element to driving, its fantastic working the gears.

[Cool Hand Luke]

I dont think the advantages of a manual only come into play on the track. Manuals are great, as you have much better throttle control, which can always be used on the street

[bazr33]

i heard of the fella that did the conversion for me, from mates as they went to skool with him and, my mate got his engine converted in his vl with gearbox and rb25det for 7000

i thought it was a good price aswell when i heard, with everything done and drive away

also depends where he gets the gearboxes from, which he prolly gets them very cheap, to make a profit.

with the power,

i was looking for power, but my main concern was ecu options

and havin control of my car , knowing that its not goin to change back around a corner and spin out.

if any of yous are interested in convertin let us know send us a pm and i'll give you his details.

the price was 2500, and he gave me back the auto gearbox, and torqueconverter

and the tailshaft was modded so didnt get that back .

goin to the quarter in two weeks