6p turbo LOW OIL PRESSURE!

[FerociousP]

This is updated from the other forum where originally posted...

motor:

- s5 6port turbo conversion
- s5 n/a block, stock s5 t2 everything else
- oil feed line taken from aftermarket oil pedestal
- tapped n/a cover for stock turbo oil return
- autometer sport comp elec. gauge in stock location
- mech oil pressure gauge in pedestal

problem:

Oil pressure upon initial startup of the motor was around 28-30 psi at idle and above 50psi at rpm. as motor warms up, oil pressure declines.

startup cold:

25 psi at 800rpm, 50 psi when I rev.

hot driving:

30-35 psi at 2k, 40-50psi from 3k on.

hot idling:

0-10 psi at 800, 15-20 psi at 1200.

Other:

- oil psi does not decrease (just stops around 50psi) at higher RPM
- 20w50 Castrol conventional
- Pure-one oil filter
- gauge wiring has clean, tight connection


mech gauge tested... pressure on the electric gauge accurate,
mech gauge shows 10psi at idle

oil is a grayish color, similar looking to antisieze (for threads) but darker and without being shiny... Is that a telltale sign of anything??

[classicauto]

Mileage on the engine? Could be a failing regulator.

EDIT: also, just realized this was a 6Port turbo...

The way you've done turbo oiling *seems* alright, shouldn't affect the pressure too much....


Greyish oil is a sign of contamination (obviously) that may have come from bearings.

[djmtsu]

I can answer a few questions for Paul, since I helped build it.

Mileage really is unknown. We bought the engine from a 7 lover in Bama. We pulled it out of the car, running perfect. The engine ran great and had no issues.

We did the 6 port turbo conversion, using all TII factory parts, with the exception of the Japan2LA modified LIM. After the conversion is when the motor's oil pressure started acting funny.

I recommended replacing the regulator, but we haven't yet.

[85rx-7gsl-se]

Its the pink fender

[djmtsu]

Originally Posted by 85rx-7gsl-se

Its the pink fender

SSSSSsssshhhhhh..............

[classicauto]

Hmm, well I'd say the regulator would be a good place to start. There's not many things that would lower the pressure significantly other then the pump (its possible, but I've never seen a bad one) the regulator really.

Tough call.

But with greyish oil, I'd be addressing this sooner rather then later.....ideally immedeatly rather then sooner

[FerociousP]

i'm working on an escort that I just got running to be my DD while i tear it down, so it'll be just a few more weeks until I can try to change it....

I've read that greyish oil is a sign of water or coolant, but I'm not losing any... could the turbo itself be failing internally causing probs?

[85rx-7gsl-se]

Need any help, let me know

[FerociousP]

the pink fender was there when the engine was fine... look at the deal's gap pics sshheesshh

[85rx-7gsl-se]

I know, I just figured I would say it before DJ did

[J-Rat]

What about the oil ring behind the front cover? Thats notorious for dropping out and causing low oil pressure issues.

Rat

[85rx-7gsl-se]

^ That's what RETed mentioned on 7club, that is very likely.

[djmtsu]

Yup, I think we just need to pull the front cover off and go from there. I know he doesn't want to do it, but hey its worth a shot and DGRR is coming up quick. Hopefully he can tear it apart next weekend when he can use my garage.

[85rx-7gsl-se]

I really hope he can get this resolved by DGRR, we don't want another Rest Stop incident

[classicauto]

Originally Posted by FerociousP

I've read that greyish oil is a sign of water or coolant,

Well in my experience by the time you get enough water in your oil to actually change it a greyish colour, you'd need to be missing alot of water.

If anything its a combinaiton of poor crankcase venting (and the moisture that would put in the oil) and other contaminants that are changing the colour.