Inliners International Forums General Discussion Blown and Injected Blow Through Tuning

Well well see what happens once we get the AFR's down. If the problem persist well look into options for the turbine side.

I would think your turbine housing size is fine.
It is already bigger than stock,,.63 to .82.

The stock engine size the turbo was on was a 231 CI,your engine is a 230 very close in size.

Just my two cents.

MBHD

Thats what I figured, its a 3.7L motor with a turbo from a 3.8L so why wouldn't it work fine? Like I said we got some cleaning up to do. Going to run a Vacuum Manifold, work on getting those AFR's down.

Rev, there is more sizing a turbine on a turbo than matching C.I. a buick has better intake flow compaired to exhaust, has longer tube type exhaust pipes that loose heat than a six with short iron manifold, a six has better exhaust than intake flow percentage etc.
A/R ratios are only for fine tuning a correct turbine, .63 .83 1.15 will not help if the wheel is wrong !

Also what is a vacuum manifold?

I may be wrong but when I started everyone around here used a smaller turbine until I loaned them my larger one, then everything changed.

Harry

posted 06-06-2007 04:55 PM
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You might have too small of turbine housing like Tlowe said, also,your turbine wheel is too small.

Vacuum Manifold, basically a central point to feed all my boost signals off of for the gauge, bov,ect.. instead of having the numerous T's I have now.

i guess get started with the afr's and find out where you are at. that is the easiest. later you may have to work with the turbo more. tom

Yeah i have no doubt it may be too small, probably an actual GN turbo would be best, this Riveria T has a 2in wheel I believe the GN's have a 2.5" or 3" wheel.

Worst comes to wost I just keep the boost low till i can upgrade it.

While searching around for a GN turbo ive come across the TA-49's. Could be a very viable option for my setup i think.

Guys on the GN websites are always selling there turbos to upgrade to bigger turbos.
Could find something on those forums?

Have you done anymore runs w/your Nova?

Just finished getting the vac hoses cleaned up. Ive got some inside wiring to finish so for now im just driving it on 3psi. But yeah looking at the GN turbos compared to my Riveria Turbo the 3" turbine exit vs the 2" I have may help if I am truly over spinning it.

Wow,a 2" exit is really small, I did not know it was really that small.
That really chokes it.
But @ least you know now you can make a lot more power w/a properly sized turbo.

MBHD

Yeah although a odd setup with the 3 boly inlet flange there is a ton of support for the Buick GN style turbos. the TA49 is a stock looking turbo that alot of GN guys are pushing well into the low 11's. They preform just like stock ones till you get over 15psi so a nice one to use and work up with.

I would still like to find one of the large 292 manifolds with the 2.5in outlet and rework my tubing to hopefully get better flow in that also. Although ive located another stock manifold that im going to play with porting out and blocking off the heat from the intake...

Did you ask Tlowe if he has a spare 292 manifold?

Rev, you might want to just rework the "J" pipe you have going into the turbine. If you were to up size it just before the inlet you would effectively slow down the flow to where it would not spin the turbine that fast. It's just a thought.

The inlet is small to the turbine housing, if you make the "J" pipe any bigger it will have a step entering the turbine housing, not good.

He just needs a correct sized turbo.

I got the AFR's down to the high 12's @ WOT and the motor really perks up at 5-6psi. With steady throttle you can feel the boost come in when it hits 4.5ish and above.

Cool, what did you do to change the A/F ratio?

MBHD

Drilled out the PV channels a hair at a time. Could use to go a bit more cause is a tad fat @ cruise but they are close enough to play around. On another note that noise is back, im thinking its bearings since the side to side shaft play it worse. However not scraping the housing yet. Possibly look into some bearings to be safe, Cant expect much from a $60 turbo

Maybe,,, instead of putting more $$$$ into a turbo that is too small,maybe get that TA49 turbo you had your eye on?

MBHD

Yeah will have to see, I can have this one refurbed for the cost of parts though, have a buddy that rebuilds them locally

RevOD,
how much would one of those TA49 turbos sell for?
Just curious.
I think a rebuild kit is going to cost $60-$100

MBHD

It would cost me $35 to rebuild mine the TA49 range $300-$500 depending on condition

That's a good price!

I am just saying with all the tunning you are doing with your small turbo, you will be going through the whole process again with a larger turbo.
Not sure if you want to spend that much time going through it all over again?
For me, I do not have much time to do anything, that is why I would get the turbo that will work best,, & do the jetting, timing,process one time ,,,not twice.
Just my thoughts.

MBHD

Yeah my buddy has sets of bearings, seals ect jusy lying around. It leaks no oil so were just gonna do bearings for now.

Well I will have to redo the tuning all over one i build a motor for it, not a stock 80,000 mile 230 with tons of blowby lol..

If and when I build a fresh motor Ill worry about a new turbo.

I see,
I did not know it had a lot of blow by.
Plus your next engine will be bigger I guess?

MBHD

Yeah either a bored out 250 or a 292. The blowby is managable but the oil collector I made is slowly filling up lol. This is more of a lets see if I can make this work. Not looking to dump a ton into a turbo to stick on a turd motor.

Blow by does not hurt too much as long as it's not getting to the spark plugs.
Sounds like you have a good vent for the crankcase.

Anymore tunning action?

MBHD

no nothing else, just too busy right now. Got a trip to take the car to in a few weeks so im holding off till then to play around anymore. The fresh bearings are in and the howling noise is gone. We will see how long these last lol

Taking a nice 3hr cruise tomorrow also so it should get a good shakedown run.

Shawn:
PM me before you leave on your trip.

Thanks

The cruise went great, I need to isolate that intake manifold cause after some driving its stumbling. I guess that turbo is frying that offy manifold being in direct contact lol

I am sure it gets really hot.
Are you going to try & separate the two?
Is the intake too hot to touch?
MBHD

Yeah Its get very hot to the touch. I think im going to mill the bottom of the intake. Remove that casting area that is used to let the heat get to the entire underside. Then block off the exhaust manifold and wrap heat tape on the exhaust manifold.

On the topic of switching turbos, what do you think about the HX-35 from the 5.9L cummings? I have a line on one of those.

I think those are designed for low RPM applications AKA (diesel) & would not be a good choice.
What happened to the GN TA-49 turbo?

I am thinking about wrapping my turbo manifold also.

MBHD

Im just tossing out ideas, I see both of these come and go on a regular basis so wouldn't be much of an issue hunting either one down. You also have to remember those Diesel Turbos act differently on gas engines. A lot of the BMW crowd uses the HX turbos, even the 4cyl Mustangs use them and make power well into the 6000+ rpm band

My suggestion, would be,,,, find a turbo,that will fit your application,don't skimp & get an incorrect turbo because you got it cheap.

You can have a correct size turbo on your high blow by engine, it's not going to hurt a good turbo,install a prefilter before the turbo's oil feed line incase a bearing or something else lets go,that way it will save your nice turbo.

MBHD

Like I said once I build a bigger motor I will worry about getting one sized to the cam, ci, ect...

][/QUOTE]Im just tossing out ideas, I see both of these come and go on a regular basis so wouldn't be much of an issue hunting either one down. You also have to remember those Diesel Turbos act differently on gas engines. A lot of the BMW crowd uses the HX turbos, even the 3cyl Mustangs use them and make power well into the 6000+ rpm band [/QB][/QUOTE]

I see your tossing ideas, but you do not seem to know what size engine you are going to use or camshaft,or turbo size,or??? so tossing around different turbo sizes seems to be pointless, unless you just want to talk about different turbos,different size engines,but that type of banter will just go on & on & really not get you or any other people here on the BB any closer to getting a correctly sized turbo or good information or cam or????

BTW what is a 3 cylinder Mustang?

MBHD

Im looking for turbos to use on this STOCK 230ci motor i have now. Incase the one i have shoots crap. Remember the talk about this one going bad and possibly being to small. Im think of what I could get to replace it on this motor. Which is why im thinking cheap. And I meant 4cyl Mustang.

For all I know I may end up putting my v8 back in and turboing that when it all comes down to it. Ill just end this thread here as you stated its going nowhere.