SoarerCentral: My Qtr Mile and Trans issues

SoarerCentral General Soarer Chat My Qtr Mile and Trans issues

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Christian Molenda
TryHard
QLD
T

Posts: 477
Reg: 07-2005

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Friday, October 19, 2007 - 07:10 am, by: Christian Molenda (Christof)

Hello

Well last night i went to test and tune. After much messing about we got there half way into it and didnt have much time to get many runs in. The plan was to rotate tyres between me and my mate. As soon as we got there we both lined up to race. Me still on my 20's him on the et streets.

As i was on the 20's i decided not to waste my time stalling the car up and just took off normally. This resulted in a 2.221 60ft. just as the car got into 3rd gear it started feeling as if something was slipping (not sure if its the converted not locking up or 3rd gear killing itself) and the revs felt like they were dropping off and picking up and the car not picking up speed

anyway i kept on the gas knowing that this was going to be my only run for the night and resulted in trapping 116.25 mph. Im sure i lost 2 or 3 mph because of the issue. It felt like it just stopped pulling.

anyway end result was 12.67 and smoke bellowing out from under the car on the way back to the pits.

i let it all cool down and took it easy on the drive home.

Has anybody else had this problem?
Also should i hook up a manual lockup switch, would this possibly fix the prob?

guess i should call mv's to see if they have any ideas.

Callum Finch
Goo Roo
WA
Soarer TT & Corolla

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Friday, October 19, 2007 - 09:37 am, by: Callum Finch (Sigeneat)

There are some diagnostics that you can run on the auto box without any plug in tools to give you an idea what is happening.

The electronics in the gearbox also allow for anyone with the appropriate Toyota plug-in tool thing used for diagnostics to find out exactly what part of the box is failing. At least thats what im lead to beleive ;)

I'm thinking clutch packs are giving up the ghost, however not sure about the smoke o.O

What colour/smell is the transmission fluid? If its burnt at all then perhaps start with a flush. The solenoids and other parts are very fussy if they dont get nice clean fluid! ;D

One of the first things i had to do to my car after i bought it was swap out the transmission; its a pain in the ass!

With the sort of power you would be putting out (Going by mods in profile..) it would sound likely that something is not able to hold the power anymore. MV should be able to give you some advice at least! ;D

Cara Joseph
TryHard
victoria
skyline T

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Monday, October 29, 2007 - 12:48 pm, by: Cara Joseph (Carasky)

christian unless you have a fully built trans the enividible is happening and your trans is caput.

Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder

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Monday, October 29, 2007 - 01:47 pm, by: Daniel Clarke (Dieseltrain)

Christian Molenda wrote on Friday, October 19, 2007 - 07:10 am:
just as the car got into 3rd gear it started feeling as if something was slipping

That would be the convertor locking up... But it shouldnt take long for it to lock right up and the car to start moving again....

Could be the lockup clutches were being fried by the power and more than likely Cara is correct. The smoke is probably the clutches burning or the oil burning from the excessive heat caused by slipping clutchpacks.

ALot of people forget that while the Autos with a shift kit might be good, the wont hold for long at 270+rwkw. Specially if they are getting close to the end of their life! On a new box they will prob last a while at that power output with a shift kit and trans cooler... But on a Well USed Box, it will only finsh the job quickly.

With that said though, Trapping 116mph is pretty damn good! Ben was running in the 118's with more power and on ET Streets.

Maybe there is nothing wrong with the box itself, just the oil being cooked! INvest in a some Castrol TRansmax Z oil or some Redline Synthetic racing Oil!

Better Oils will help raise the boiling point of the Fluid which will allow the clutches to take more punishment.

Cara Joseph
TryHard
victoria
skyline T

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Monday, October 29, 2007 - 02:05 pm, by: Cara Joseph (Carasky)

Transmax Z is the go for sure.

Christian Molenda
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T

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Monday, October 29, 2007 - 02:28 pm, by: Christian Molenda (Christof)

i think my mph would have been higher without the trans issues. (atleast 118mph)

I was thinking it may have been the converter trying to lock, but it just did not happen. it did not seem like the it was actually slipping as the revs werent raising. I will flush the trans soon and see if that makes a diff. Will also get a temp guage whilst at it.

im looking forward to getting that 11 second time slip.

Cihan Aday
Moderator
www.etuner.com.au
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Monday, October 29, 2007 - 04:50 pm, by: Cihan Aday (Cihan)

Christian, you could cut and connect a 10k resistor to the SL (solenoid) pin from the ECU to ground. That'll get rid of lockup if want to try it out.

Once power levels go up it feels as if the car slows acceleration when its trying to lockup. Happens at about 130-140kph. Since its been unlocked in 1st and second for at least 10 seconds at full power the trans fluids already hot.

Because trans fluid expands when its hot, the pressure check valve on the trans housing can open and dump fluid to relieve pressure. If its coming out in 3rd, its most likely pouring out onto the exhaust piping and causing the smoke. Happens all the time on the dyno, especially if theres no trans cooler, the lines to cooler are restricted/bent or the fluids overfilled.

Christian Molenda
TryHard
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T

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Monday, October 29, 2007 - 07:20 pm, by: Christian Molenda (Christof)

Hey mate

Sounds exactly like what you just mentioned. I will give it a go next time im at the track. I will also give the trans a propper flush and use some good fluid.

Thanks for your help as always.

Christian

Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder

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Monday, October 29, 2007 - 10:02 pm, by: Daniel Clarke (Dieseltrain)

Np's, Hpefully its just in need of a good flush and some good fluid

Good luck and keep us updated!

Benjamin Burgess
Goo Roo
NSW
Toyota Soarer GT-TL, Toyota Corolla Conquest

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Tuesday, October 30, 2007 - 09:05 am, by: Benjamin Burgess (Jampac)

Daniel Clarke wrote on Monday, October 29, 2007 - 01:47 pm:
With that said though, Trapping 116mph is pretty damn good! Ben was running in the 118's with more power and on ET Streets.

118.9mph to be exact

I think you'll find that it's not effecting your trap speed. After getting my box rebuilt I was expecting to come back and trap higher, but it wasn't much if any at all. The biggest gains I've gotten in trap was from letting the car cool down enough between runs. Also you'll find you'll loose a small amount of trap speed when using ET streets. I'd estimate you'd run a 11.6 with the right 60ft.

Maurice Diggler
Goo Roo
Victoria
Twin Turbo

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Tuesday, October 30, 2007 - 05:28 pm, by: Maurice Diggler (Mau_rice)

Cara Joseph wrote on Monday, October 29, 2007 - 12:48 pm:
christian unless you have a fully built trans the enividible is happening and your trans is caput.

Hahs, speaking from experience huh! I remember yours giving up after 1-2 days lol

Christian Molenda wrote on Monday, October 29, 2007 - 02:28 pm:
I was thinking it may have been the converter trying to lock, but it just did not happen.

I have the exact same problem, since fitting the cams and tuning it wont lock up, tries to but never does

It ruins my dyno runs and 1/4

I'll get it sorted soon.

Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder

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Tuesday, October 30, 2007 - 07:32 pm, by: Daniel Clarke (Dieseltrain)

Stick in a Manual, that will really FUBAR your 1/4 times

Maurice Diggler
Goo Roo
Victoria
Twin Turbo

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Tuesday, October 30, 2007 - 10:02 pm, by: Maurice Diggler (Mau_rice)

Haha, and my driveshaft! Feel the burn huh Shane!

If/when I have R154, the day I get it is the day I sell off my MT's and do away with 1/4 and focus more on Phillip Island and Winton

Daniel Clarke
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NSW
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Wednesday, October 31, 2007 - 07:26 am, by: Daniel Clarke (Dieseltrain)

Poor Shane,lol!!!

And yeah dude.. Stick shift and Circuit work FTW!

Shane Crichton
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Cressida Turbo

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Thursday, November 01, 2007 - 11:25 am, by: Shane Crichton (1jz747)

Daniel Clarke wrote on Monday, October 29, 2007 - 01:47 pm:
Maybe there is nothing wrong with the box itself, just the oil being cooked! INvest in a some Castrol TRansmax Z oil or some Redline Synthetic racing Oil!

Better Oils will help raise the boiling point of the Fluid which will allow the clutches to take more punishment.

i woudl actually advise against this.

dont run synthetic in your box unless its been fully built, synthetic oils are far harder on the trans than non synthetic.

it will run higher line pressure with synthetic than non, this will resulted in a busted box. if you run cheap ass valvoline dex3 and change it regularly it will slip before it breaks.

also, most synthetic dex 3 products are built with metal on metal thought process. it doesnt not factor in soft clutches. we are testing this at present with my box.