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Josh Lynch
Newbie
VIC
TT 5sp Manual

Posts: 1
Reg: 02-2006

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Wednesday, February 15, 2006 - 09:33 am, by:  Josh Lynch (Guruvee) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hi Guys,

I am the proud owner of a new TT 5sp Soarer. The car is stock standard with the exception of a HKS intake and I have to say I am very impressed with the power at low revs and gear changes (coming from a previous TT Supra owner with heavy mods), but once revs hit around 4500-4700 the car seems to struggle a fair bit to hit redline.

Judging from the way it struggles I have a feeling it’s a spark related issue and may need some new plugs or possibly coil packs? I know a lot of people here recommend iridium plugs, but I’m planning on doing some mods relatively soon and think I’d like to have a go with copper for now unless there are known issues with this? Does anyone here use copper plugs and what is the best gap to use for a relatively stock engine?

Also if anyone else has experienced the same sluggishness at high revs and believes it may be something else I’d be more than appreciative for your feedback. Could it also possibly be the stock exhaust holding the car back?

Cheers,

Josh
Cihan Aday
DieHard
Victoria
JZZ30

Posts: 541
Reg: 07-2005

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Wednesday, February 15, 2006 - 09:48 am, by:  Cihan Aday (Cihan) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Josh, i kind of had the same issue - where my car didnt pull as hard as other soarers at high revs. Since putting in the emanage and leaning it out a bit its definately woken up, alot more than expected. Its driving very well now.

I do believe its an ignition related issue, and ill be looking at it in detail when i get a chance.

What i have gathered so far is that lightening the fuel load where it matters is a good remedy as the cylinder isn't 'flooded' with fuel like the factory tune. Since its most likely a weak spark issue, your car probably blows black smoke at higher revs (lots of it!) like my one did. Before the emanage, changing the spark plugs and gapping them down to 0.7mm helped mine slightly but we can rule that out.

Most likely dirty coilpacks or coil related?
Though, Ive never had any shuddering or missing issues..

Cheers,
Cihan.
Sam Schreck
DieHard
ACT
vvt-i JZZ31

Posts: 533
Reg: 07-2005

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Wednesday, February 15, 2006 - 02:20 pm, by:  Sam Schreck (Schreck300) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Have you reset the ECU? If not, try it first. Just to make sure it's not being lazy. May not help at all but certainly won't hurt.
http://soarercentral.com/sc-forum/messages/10/21.html?1098228107
Josh Lynch
Newbie
VIC
TT 5sp Manual

Posts: 2
Reg: 02-2006

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Thursday, February 16, 2006 - 02:40 pm, by:  Josh Lynch (Guruvee) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Thanks guys! I'm picking up the car on Monday and getting it registered (only just been complied), so once that's done I'll reset the ECU and change the plugs.

Cihan: Is .7mm-.8mm to cold for a stock TT? Also are you using copper or iridium?
Cihan Aday
DieHard
Victoria
JZZ30

Posts: 542
Reg: 07-2005

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Thursday, February 16, 2006 - 06:49 pm, by:  Cihan Aday (Cihan) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Sam i reset my ECU all the time, not likely the case here.

Josh, the heat range of a plug is determined by the insulator nose length, electrode material etc. I gapped the standard bk6re plugs down to 0.7mm to stop the chance of missing under boost/high cylinder pressures. Its a '6' plug, which is standard. A heat rating of '7' means the spark plug is better at removing heat from the cylinder, subsequently reducing combustion temperatures and reducing the chance of detonation or pre-ignition.

Good luck with that :-)
Cheers,
Cihan.

ps. im using NGK copper plugs, very cheap at $4 each. They work well, many forum members can vouch for that.
Ryan Mason
TryHard
Victoria
Soarer TT-L

Posts: 101
Reg: 01-2006

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Thursday, February 16, 2006 - 07:37 pm, by:  Ryan Mason (Ryan_m) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Yeah, standard gap for a 1JZ-GTE is .8mm and should be dropped down to .65-.7mm when you are running higher boost (17psi+)

I'm no expert here but I've seen a lot of threads on this topic where it turns out to be spark plugs / coil packs like Cihan mentioned above.

Luckily, plugs and coil packs are cheap, you can get some 2nd hand ones for $20 each usually. That's not too bad.

PS - What type of Supra did you have? A 1G-GTE or a 2JZ-GTE? Do you have pics? Post em up :-)
Josh Lynch
Newbie
VIC
TT 5sp Manual

Posts: 3
Reg: 02-2006

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Saturday, February 18, 2006 - 10:08 pm, by:  Josh Lynch (Guruvee) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

It was a 2JZ-GTE. Sold her last year due to financial reasons, but now i'm back on the turbo scene. I'll take some pics of the Soarer after I pick her up on Monday.

Another question guys. Do manual TT Soarers have a LSD as standard like the manual Supras do or was it an option?

Supra had:
Genuine trial front bar and carbon fibre bonnet
18 DTM Blitz rims
GEAR coilovers
exhaust
Blitz intercooler
hks intake
AVCR
TRD Strutbrace
Mines ECU
TRD Sports Steering wheel with airbag
Full TRD Dash
TRD LSD


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Josh Lynch
Tinkerer
VIC
TT 5sp Manual

Posts: 6
Reg: 02-2006

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Thursday, February 23, 2006 - 11:38 pm, by:  Josh Lynch (Guruvee) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hey guys!
Turns out the only problem was the fuel in the car! It hadn't had new fuel since it arrived in the country last August. As soon as I put some BP Ultimate in the engine kicked right back and now no more boost issues
Matthew Sharpe
TryHard
North Island
3.0 GT

Posts: 400
Reg: 10-2005

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Friday, February 24, 2006 - 06:30 am, by:  Matthew Sharpe (Madmatt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Dont you love it when problems are that simple!
Mark Paddick
Goo Roo
ACT
Soarer UZZ31

Posts: 1853
Reg: 07-2005

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Friday, February 24, 2006 - 12:09 pm, by:  Mark Paddick (Sparks) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

LSD was an uncommon option in ALL Soarers. 5spd man TT is more likely to have it. Check codes on ID plate. A02B from memory is Torsen.
Check the fuel filter too, it could be the cause of the problem rather than fuel itself. Fuel filter problems will often go away for a time after a tank refill.

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