r154 top gear speeds?

[Supralover87]

I just got done doing my 154 swap and was surprised to see that at the same speeds in my auto i was doing 500 rpm more with the manual... are the speed to rpm ratios really that different from auto to manual?

EX: auto at 60 was 2100rpm
Manual (r154) 60 was 2500 to 2600

This worries me because it means my 5th gear will wind out very early

anyone else notice this?

 

[Insidious Surmiser]

could have to do w/ the rear end (nevermind, i see you're talking about the same car)

just for reference... i had a 3.73 rear end and my gears went like so... (r-154) i also got 30+mpg (80mph @ 3,000rpm)

45
60
90
120
165

all speeds are at or very close to 6,500 rpm

 

[Supralover87]

What ratio LSD did 89 turbo's have? i thought it was 3.73? and i'm lucky if i get 15 mpg in my 88 turbo and i'm not a lead foot WTH???? lol

And 6 speed????

 

[lewis15498]

could have to do w/ the rear end (nevermind, i see you're talking about the same car)

just for reference... I had a 3.73 rear end and my gears went like so... (r-154) i also got 30+mpg (80mph @ 3,000rpm)

45
60
90
120
140
165

all speeds are at or very close to 6,500 rpm

wtf?

Supralover, was your car originally an auto? or W58?
EDIT: I see this was answered in the original post. IIRC the autos had either a 4.1 or a 4.3. This could explain it.

 

[Supralover87]

Thank you lol I thought something was amiss

Mine was originally auto....

 

[2jz88mk3]

raise your rev limit.

5th gear, 8000 rpm, 3.91 rear - with tires close to stock size will net you about 200 mph.

just rev the shit out of it... the r154 has room for teh speed.

 

[IJ.]

raise your rev limit.

5th gear, 8000 rpm, 3.91 rear - with tires close to stock size will net you about 200 mph.

just rev the shit out of it... the r154 has room for teh speed.

yeah ok......:nono:

 

[lewis15498]

yeah ok......:nono:

 

[lewis15498]

Supra lover, the R154 ratios are as follows
First Gear: 3.250:1
Second Gear: 1.955:1
Third Gear: 1.310:1
Fourth Gear: 1.00:1
Fifth Gear: 0.753:1

Jack the rear end of your car up and support it with jackstands. Throw the car in neutral. take some whiteout and make a mark on your tire (put it on tread so it will wear off. Put a mark on your driveshaft as well. Spin your driveshaft by hand until the tire makes one full rotation. However many times you spin the driveshaft to accomplish this is your differential ratio. Last measure the circumfrence of your rear tire. Using this data and simple math you can figure out exactly how fast you will be going at any RPM in any gear. You could even make a graph if your feeling extra geeky. Then if your not satisfied with the speed-RPM figures you can select a diff that better suits your needs.

 

[92TealSupra]

raise your rev limit.

5th gear, 8000 rpm, 3.91 rear - with tires close to stock size will net you about 200 mph.

Just rev the shit out of it... The r154 has room for teh speed.

lol!!!

 

[IJ.]

Auto's have a .705:1 top gear.

 

[hvyman]

wtf?

Supralover, was your car originally an auto? or W58?
EDIT: I see this was answered in the original post. IIRC the autos had either a 4.1 or a 4.3. This could explain it.

auto's have the same diff as manuals. the difference is what year the car is and n/a or turbo.

pre 89 turbos have a 3.91.
89+ tubros have a 3.73
all n/a have 4.3 open. sport package n/a has 4.3 lsd
iirc the 1jz cars have a 4.1 torsen.

 

[lewis15498]

Auto's have a .705:1 top gear.

.753 with the R154 vs .705 with the auto would explain your difference.

auto's have the same diff as manuals. the difference is what year the car is and n/a or turbo.

pre 89 turbos have a 3.91.
89+ tubros have a 3.73
all n/a have 4.3 open. sport package n/a has 4.3 lsd
iirc the 1jz cars have a 4.1 torsen.

In which case I did not recall correctly lol.

 

[2jz88mk3]

I just got done doing my 154 swap

yeah ok......:nono:

lol!!!

Damn you haters!!! make me dig it up ... sure here you go.

http://www.car-videos.net/tools/spe...7=&Redline=8000&Increment=1000&B1=Recalculate

keep in mind all mph numbers listed in the grid are with a 0.965% reduction

it lists 193.9 mph for 5th gear... 193.9 / 0.965 = 200.9 mph

----

so i said with close to stock tire size, 8000 rpm, 3.91 rear would net you ~200 mph...

anyone care to point out what im missing?

bring the hate!

 

[IJ.]

How does she raise the limit on a 7M for starters....

Not hating just don't post inane shit.

 

[2jz88mk3]

How does she raise the limit on a 7M for starters....

Not hating just don't post inane shit.

All right i was having a bit of fun with my claims of hate =P

It's no secret how one would go about to raise the rev limit. Obviously purchases are required.

I find that someone who is concerned that their r154 doesn't have enough speed in the gears, has enough power/budget to get there. It seems to take most cars around 500 bhp to reach 200 mph. If someone is concerned that 157 mph (the number for 5th gear and 6500 rpm for the specifics i've previously listed) is not fast enough, i would naturaly assume that have the power/budget to overcome the stock rev limit (purchase a standalone).

I'm still compelled to claim my comments: not inane...

Is that better? :icon_bigg

 

[IJ.]

You're making far too many assumptions before posting and it's making your posts irrelevant and inane.

Find me a single post where the OP has stated she has anything like 500hp crank or wheel.

 

[2jz88mk3]

You're making far too many assumptions before posting and it's making your posts irrelevant and inane.

Find me a single post where the OP has stated she has anything like 500hp crank or wheel.

Firstly, I made no assumtions of the OP's setup. I know nothing about it. My comments are directed only to someone (regardless of setup) who is concerned with the speed a r154 can deliver to them. If you want to go fast you need power.

I suppose I could have assumed instead, that the OP simply is not aware of the r154's ratios, because of their concern that it will "wind out to quickly"

Do you find it unreasonable to assume that someone who is concerned that 150+ mph is not enough, has some upgrades? Or should i have just said "unless you have upgrades you need not be concerned with being limited by the r154, and once you have certain upgrades (raised rev limit) the speed the r154 is capable of delivering to you will be increased like wise"?

I find it is worse for someone (anyone, not directed at the OP) with stock power to claim an r154 cannot deliver them the speed they desire, then for me to assume they have the power to breach the speed an r154 can deliver at stock rev limit.

No I have not seen any post to indicate anything about the OP's setup or circumstances. That info is not required for the comments i've made.

 

[dragracer]

4th gear in the A340 auto is .705 ratio and 5th in the R154 is .753

Since your running 3.73 gears, all other stock ratios are lower.

JawsGear makes some 3.55 (3.50) dont remember.

It could be worse, like my 4.30 gears and 3200 rpm at 65

Nothing wrong with your setup. Thats what the factory designed. You were just used to the taller final gear ratio in the auto.

Just my 2 cents:icon_razz

 

[Nghty89]

Firstly, I made no assumtions of the OP's setup. I know nothing about it. My comments are directed only to someone (regardless of setup) who is concerned with the speed a r154 can deliver to them. If you want to go fast you need power.

I suppose I could have assumed instead, that the OP simply is not aware of the r154's ratios, because of their concern that it will "wind out to quickly"

Do you find it unreasonable to assume that someone who is concerned that 150+ mph is not enough, has some upgrades? Or should i have just said "unless you have upgrades you need not be concerned with being limited by the r154, and once you have certain upgrades (raised rev limit) the speed the r154 is capable of delivering to you will be increased like wise"?

I find it is worse for someone (anyone, not directed at the OP) with stock power to claim an r154 cannot deliver them the speed they desire, then for me to assume they have the power to breach the speed an r154 can deliver at stock rev limit.

No I have not seen any post to indicate anything about the OP's setup or circumstances. That info is not required for the comments i've made.

I believe IJ's problem is with you saying 8,000 rpm's on the rev limit. It's much more complicated than *just* getting a standalone and raising the limit.