BAD TURBO / RB25DET 5xx RWHP

[SillyRB]

GOD DAMN IT !!! Well 2 nights ago i dynoed the car with Rolo from (www.centralfloridaturbo.com) and we made 546 RWHP @ approx 29psi. The car felt sick. I raced a GXSR 750 with a slip on and dropped and put a few cars on him. So to say the least the car felt good.

Well last night after having the car on the dyno'd the car 2 nights ago we ran into NO PROBLEMS. Then yesterday we get on the interstate .I turned the boost down to about 18 psi to race a lexus (with a 2J swap for ****s ang giggles), i am rolling on the throttle in second gear at about 80-90% on the TPS im at about 13-psi of boost and then i just see a huge cloud of smoke, im talking about massive, it looked like hurricane Precision just came out of my exhaust pipe. The motor had not boost leaks, had been pressure tested no LEAKS !!

Pull over on the side of road, pop my hood, and the nut of the from the wheel of the turbo is all way backed out toward the front of the compressor. The funny thing .... the turbo has been on there for about a month or two, but anyone who knows me , knows for a fact i do NOT drive the car around but once a week. The turbo maybe had 7-800 miles on it (while on the dyno). Then now this. Im ****ING pissed off ! Lets hope precision warranty this, as i went by all the oil specs they told me for the turbo. I went with a -4 feed with no Restrictor (As Precision told me) and they recommended atleast a -10 return, i went with a -12 return.

I was going to re-dyno tonight with a few things changed, guess that is not going to happen. This is the second bad turbo from PTE in 3 months i have had.

Modified by SillyRB at 8:35 PM 9/29/2005

Modified by SillyRB at 10:37 PM 10/24/2005

Modified by SillyRB at 10:41 PM 10/24/2005
Modified by SillyRB at 10:42 PM 10/24/2005

[Kansei240sx]

Ah, man... that sucks hardcore, what kind of turbo is it, as in Trim size/.ar bla bla bla.

[SillyRB]

PrecisionPT67P Trim wheel .81 Back Full T4

Then they told me that i "overspun" the turbo, or i had to much back pressure saying that the rear of the turbo was to small for the motor. W T F are they talking about, I am pissed off, Gonna take the turbo off this weekend and send it back. Hopefully will post pics in the next day or 2.

[BoostFab]

that seemed rare for Precision's turbo. maybe they forgot to use locktite

btw! what fuel management are you using? i'm assuming Microtech @ CFT

[SillyRB]

Yeah Microtech LT-12

[eh?]

Any mods to the bottom end? Fixed the misfire problem?

[fly240]

that is suck man......hope you get the turbo solve....

I though rb turbo uses water and oil cool...do you use both cool or just one type of cool...I want a new turbo for my r33, but want to make sure what type of cool is rb using?

[SillyRB]

that is suck man......hope you get the turbo solve....

I though rb turbo uses water and oil cool...do you use both cool or just one type of cool...I want a new turbo for my r33, but want to make sure what type of cool is rb using?

No just oil. Most aftermarket turbos do not use water cooling.

[fly240]

so you just block the water line? and using only oil cool. I thought rb is water and oil cool?...thanks

[SillyRB]

Any mods to the bottom end? Fixed the misfire problem?

Yeah i fixed the mis-fire . It was something ridiculously small. Thanks to Nate.

[Imissmyturbo]

Awsome #'s man. From reading you other posts you have a headgasket (1.2 MM) and headstuds. Also some mild headwork and greddy intake manifold. What tires are you running? When does the car get traction (If ever)As for the bolt. Just tighten the sucker up ...But really precision should take care of that.

[eh?]

Would you like to share your findings? :p

[Carl H]

only time ive seen that happen is when there is severe compressor surge for a long period of time......good numbers tho, that is a rather large turbo.

*edit* just looked at that picture again and it looks like you have the retardely huge tial bov, shouldnt have any surge problems with that beast.

[SillyRB]

Awsome #'s man. From reading you other posts you have a headgasket (1.2 MM) and headstuds. Also some mild headwork and greddy intake manifold. What tires are you running? When does the car get traction (If ever)As for the bolt. Just tighten the sucker up ...But really precision should take care of that.

Yeah ill go push the back wheel back on and just tighten the sucker up. Sounds good in theory. LOL

I have 235/60/15 M/T in the back. When i raced the '05 GXSR 750 last night (I dead hooked eventually in third gear -13 psi in the tires)

*edit* just looked at that picture again and it looks like you have the retardely huge tial bov, shouldnt have any surge problems with that beast.

Exactly i went with the BOV to prevent any surge problems, which i dont get. I am trying to figure out what else could have caused this other than a faulty product ??????

[Wulfgang]

Interesting motor mounts.

[SillyRB]

Interesting motor mounts.

Thanks man. Well you have to do what you have to doBelieve it or not the car is very quiet until boost and rides very smooth. I need to get a one piece driveshaft.

[Wykid 240]

Do you have a full pic of your engine and what turbo manifold are you using?

-Jeramy

[SillyRB]

Using a HKS Exhaust Manifold !Anybody intrested will be selling with downpipe SOON ! heheheHoles for T3/ and T4 FlangesIts a bad *** manifold that gives the turbo a wicked angle.

[cvc9216]

from the pic it looks more like a broken shaft than just a loose nut

[Carl H]

Using a HKS Exhaust Manifold !Anybody intrested will be selling with downpipe SOON ! heheheHoles for T3/ and T4 FlangesIts a bad *** manifold that gives the turbo a wicked angle.

heh, yah dude i know what you mean i run the same manifold on my 20 and without a filter it looks meaaaaan.

[Wykid 240]

With that manifold, do you have to use a HKS wastegate? Also, where did you get yours? I'm looking to get one for my car. . . . thanks

Almost fortgot. . . where did you get your Greddy manifold, lookin for one of thoughs too. . . do you like that intake?

-Jeramy

[Kansei240sx]

What kind of lag and response do you get out of that turbo?

[Carl H]

What kind of lag and response do you get out of that turbo?

eh right now its kinda laggy, but then again i havent properly tuned it and what not, i should see full boost at round 4-4.5k but right now its at 5.5 or so due to a lean spot.......the turbo its self is really responsive as once it gets going its pretty fun to drive and modulate boost.

[BoostFab]

your engine bay could use a bit tlc, still nice grunt--nevertheless

[Sky240PWR]

email sent!.....thanks!

my motor bay could use some TLC too!!

[SillyRB]

You guys are right. It could use some cleaning but i never have time. When i do have time ... I am either fixing something that is brokenor getting the car ready to race that night (I.E checking timing, A/F, spark plugs, IC piping and so on)I have a few other little tricks i want to do that i learned from a few guys that are from (Microtech / Austrailia) to get a little extra power.

Let me as a question...What kind of timing are you guys running on your RB25DET's ?

[Carl H]

from the pic it looks more like a broken shaft than just a loose nut

woah!you are right, that nut hasnt moved, looks like a broken shaft, which would explain the massive ammount of oil in the exhaust.since it seems that you have proper oiling, perhaps its is due to compressor surge and a faulty bov, does the bov vent when you release?perhaps you need a new spring or something.......

[MidWest240Collector]

That mani works on the RB20 doesn't it, if so how much you looking to get?

[Carl H]

just noticed something...... is that the stock banjo bolt on the oil supply line?if so it has an internal restrictor that could have caused oil starvation because the stock turbo is bb............just a thought, i drilled mine out just incase, too much oil than too little.

[SillyRB]

just noticed something...... is that the stock banjo bolt on the oil supply line?if so it has an internal restrictor that could have caused oil starvation because the stock turbo is bb............just a thought, i drilled mine out just incase, too much oil than too little.

My stock banjol had been drilled out also.....I think the shaft might have broken I guess i will find out saturday when i get to take it off. *sigh*

That mani works on the RB20 doesn't it, if so how much you looking to get?

E-mail me with an offer