5EAT & Stage I ... how safe?

[mickeyd2005]

Can someone log rpm and mph in 4th gear and 5th gear from low speed to high speed at WOT. Log rpm, mph, and throttle.

 

Here's what a 3rd gear WOT log looks like from 20 mph:

 

http://i141.photobucket.com/albums/r69/mickeyd2005/20085eatmphvsrpm.jpg

 

Heat is the problem.

 

The service manual specifies how to raise the IAM by revving the engine in gear with the brakes applied but they limit it to xxx seconds or else damage will occur.

 

The G37 may have the same basic transmission type, but there might be subtle changes that make it different. Even if it was the same, the stock G37 makes about 236 ft-lb of peak torque at the wheels. http://en.wikipedia.org/wiki/Infiniti_G37 And that's at a much higher rpm than the LGT. A stage 1 or 2 LGT will make peak torque between 3000 and 3500 rpm. Peak horsepower isn't the issue. It's high torque at rpm < 3700 rpm.

[AKLGT]

yes, what he said ^^^^ it's the torque that kills the tranny on the stg 1/2 5EAT.

[korpsepatrol]

mickey i will be logging this weekend i hope. I will post them here if need be.

[z28dreams]

Mickey - really good information.

 

Will tuning the custom maps to keep the boost low below 3500rpm keep these transmissions safe?

 

Anything else we can do besides a tranny cooler?

[z28dreams]

Just pulled up a G37 torque curve... looks like it makes peak torque right around the 3000rpm range. Even at only 2000rpm it's making around 200 @ the wheels.

 

http://image.automobilemag.com/f/features/news/6696996/0705_c+2008_infiniti_g37+dyno_chart.jpg

[fishbone]

So the tranny should be able to take it.

Interesting, up until this point everyone was pretty convinced Stage 1 is completely safe on the stock 5EAT ...

[Jerboa113]

I've assumed that it is, I've ran a cobb stage 1 93 map since the car was almost new. No cooler or anything over stock really. I'm not ALWAYS up on it but I do get on it on occasion for extended periods.

[AKLGT]

Stg 1 is really pretty safe unless you do something dumb. For example, if you are running an intake without a tune for it, you could be causing some damage. other than that, unless you have a really crappy tune, you should be pretty safe.

[dr_sharp]

plus an SOA tech at my side (not in the car with me) who could help me put the car back together again should something go terribly wrong.

 

AK Wagon gives me crap because I practically have a personal Subie Tech who has built my LGT and will most likely do the same to the STI.

How and where did you get this and how do I get one!!!

 

And I never realized how tall 3rd is on the 5eat

[AKLGT]

Move to AK.... or you or your spouse work for the local Subie dealer service dept.

[LGTdemon]

how much is a tranny cooler? and a VB mod?

[z28dreams]

Tranny coolers seem to be around $50. Labor (if you don't do it yourself) runs around 1 hour - so maybe $50-$100 depending on the mechanic.

 

The VB mod sounds like it's quite expensive.

[korpsepatrol]

The tranny cooler is quite a simple install, i am a total noob and was able to bang it out, its easier with two people but yeah just make sure you tighten everything down since i didn't and leaked a bit. Tranny coolers are around 40-50 depending on the size of it.

 

VB mod is quite expensive however it does help preserve your tranny once you start hitting the higher power levels. The install for the vb mod which is being done i believe by toady is not for the light hearted.

[z28dreams]

korpse - which tranny cooler did you go with?

 

Seems like there are a ton of options people are using.. Hayden's, Trucools, etc. Any reason I should use one over another?

[korpsepatrol]

I went with the trucool since its the only one that mentions that it performs well in the cold and by cold i mean -5 temps.

 

My cooler is

4454 Tru-Cool LPD thin, Stacked Plate cooler kit

From bulkpart.com.

[ArcTec34]

hmm. i should look into this.

[AKLGT]

I use a Hayden and no issues, however my car is garage kept.

[matthewluke60]

So throwing down in the middle of this. I've been thinking about a cooler, VB mod, and IPT torque converter.......would getting their torque converter be bad or good for my tranny? I plan to occasionally track the car.

[ArcTec34]

what mods have you done to your car?

[NuWiz]

Which is better stacked plate or fin & plate design. I am looking at the TruCool 4452 or the 4543. Also on the 4543 it has 3/8" barbs which I think is a direct fit correct? Thanks Mike

[z28dreams]

Which is better stacked plate or fin & plate design. I am looking at the TruCool 4452 or the 4543. Also on the 4543 it has 3/8" barbs which I think is a direct fit correct? Thanks Mike

 

I believe fin & plate allows for better air pass-through. (Better for your radiator).

 

However, the 4543 is of course larger physically than the others, so it's probably close to a wash.

[ArcTec34]

im goin for the 4453..

[korpsepatrol]

i believe the 4454 is the largest you can go before you start running into fitment(size issues) and where you could put the darn thing.

[NuWiz]

That is the second time the 4453 has come up where can you find it. I figured someone messed up the numbers and ment 4543. Thanks Mike

[AKLGT]

So throwing down in the middle of this. I've been thinking about a cooler, VB mod, and IPT torque converter.......would getting their torque converter be bad or good for my tranny? I plan to occasionally track the car.

you don't need the TC. Tranny cooler easy. I do recommend the IPT VB mod if you are running a heavy stg 2+ (or more like turbo upgrade) and planning on either tracking the car or beating it to hell. Otherwise, the occassional spirited driving will be fine.