mendozam

iTrader: (5)

So, did some dyno pulls today for dyno day and it smokes heavily on deacel, I've included some videos so let me know if it's something up with the motor.

Motor is stock with 52500 miles on it. Let me know what this could be, I do plan on refreshing the motor this winter.

Pulls were done on pump gas at 12 psi, with Aspec 500r kit. Made 350 to the wheels. AFR's goes to 11.5 and leans out a bit to 11.8 toward redline.

Pull 1
http://youtu.be/s6ioBSJX28o

Pull 2
http://youtu.be/8v1Vqh00jmc

Pull 3
http://youtu.be/l5_7clE38Ro

MOBEONER

iTrader: (18)

its pretty normal to me.. WOT fuel-oil-hot exhast temps ect... Its not a hybrid dude lolol

Banzai-Racing

iTrader: (11)

I would not call that heavy, you should not be overly alarmed. I have had cars on the dyno that filled the entire shop with so much smoke you could not see or breath. This is usually caused by the wrong size (or none) oil restrictor on the turbo feed line. When it is the engine building excess crank case pressure, you can cut down on the decel smoke by installing an oil catch can. For a quick fix on the dyno we just remove the oil filler cap to allow the pressure to vent.

BoriDori

iTrader: (4)

That's not bad at all. Don't worry about it.

Turbo8

iTrader: (17)

Just to echo what others have said, not bad at all. My FD had blown stock twins and it would smoke nearly a half quart of oil every time I left off after being in boost- literally like a steam train, it was a lot of smoke and would smoke out the road.

What you have isn't really an issue. if it bothers you, you can take Banzai's advice and install a catch can to vent the positive crankcase pressure.

arghx

iTrader: (3)

If he's single turbo he probably has a catch can already...

mendozam

iTrader: (5)

Thanks guys for all the replies.

jkstill

iTrader: (11)

What kind of guidelines do you go by for oil restrictor size on turbo oil inlet?

XLR8

iTrader: (52)

Check your premix ratio as well. When my car was tuned the first time, I put a little too much Marvel in, it was pretty damn noticeable. And yes, as others have mentioned, I wouldn't call that excessive.

500R huh? Time for a rebuild, port and water injection!! . Doing the same myself....

Very clean car btw!

RotaryEvolution

iTrader: (30)

yep, a small amount of smoke isn't a huge issue.

the turbo needs oil otherwise the bearings will cook, a small amount of blowby isn't going to really hurt anything versus too small of a restrictor cutting the turbo oil pressure down too far compromising the turbo.

Banzai-Racing

iTrader: (11)

The turbo manufacturers guidlines. In this case it is a Garrett BB CHRA which requires that the oil pressure not be greater then 60psi. The FD will make 90+ psi which means it can blow the seals in the turbo if a restictor is not used.

Turbo tech 101 http://www.turbobygarrett.com/turbob...o_tech101.html

Garrett ball bearing turbochargers require less oil than journal bearing turbos. Therefore an oil inlet restrictor is recommended if you have oil pressure over about 60 psig. The oil outlet should be plumbed to the oil pan above the oil level (for wet sump systems). Since the oil drain is gravity fed, it is important that the oil outlet points downward, and that the drain tube does not become horizontal or go “uphill” at any point.

This brings up another issue I see all the time. Incorrect return line sizing or installation. I have actually seen cars that the return line was looped and kinked, causing excessive oil smoke from pressure build up. A -10an line works well, but it needs to be able to flow back to the engine.

A $12 restrictor will save the turbo oil seals. The -4an restrictor with the .035" hole does the job for most Garrett turbos installed on 13B & 20B engines.



Here is a troubleshooting chart directly from Garrett that covers multiple smoking issues.

wstrohm

On a stock FD, is there an oil restrictor in the turbo input oil line? If so, I didn't see one when I R & R'ed the turbos during a LIM gasket replacement. Where is it located (if there is one)?

arghx

iTrader: (3)

He bought a kit. Hopefully it came with an appropriate restricter and he installed it.

RotaryEvolution

iTrader: (30)

generally the hitachi's are internally restricted, admittedly i haven't torn down a set of twins since it's futile to attempt to rebuild them.

wstrohm

Thanks, Karack.

Banzai-Racing

iTrader: (11)

Stock twins have internal oil restrictors built into the inlets of each turbo that reduce the flow down to two small holes.

wstrohm

Thank you too, Banzai.

97SupraTwinTurbo

iTrader: (8)

Always worry about smoke when you accelerate not decelerate. Clean FD!