PT70-1 turbo question..........

[V6Power87]

Hey guy's,

I am getting a 70-1 turbo soon and was wondering if I will need an IAC angle boss because of the 4" inlet?

I have a PTE upper plenum that is like 5/8" taller than stock if that makes a differance?

I am replacing a PTE-52 with the 70..... wonder what kind of gains I will see with this stock motor.

 

[John Wilde]

You might, I had to purchase a 1 inch spacer from Terry Ryan when I ran mine about 5 years ago. Good luck, that is on nice turbo.

 

[azgn]

that's a lot of turbo for stock heads.......you may be in for some disapointments......stock heads just won't flow enough to take full advantage, but you'll go faster at lower boost prolly (I'm guessing you were pushing 30 lbs on the '52?)

put a set of heads and a cam with that turbo and you'll see much better times!

 

[V6Power87]

woody, I run 32 psi with the 52. So maybe 32psi with the 70 will really cram some air through it.

I have a set of GN1's, 210 roller, etc. for my next combo coming this winter, I just want to see how fast this car will go with a stock engine with bolt ons.

Who has a good IAC mount?

 

[azgn]

yeah, I figured....it'll be interesting to see what you can do.....you may need more converter to get a decent launch (note: do NOT try 32 psi with the '70......or if you do, be sure and get it on video tape!)


Casper's makes an IAC offset, and I think most vendor's sell 'em

 

[Toady]

Hey Dan,

Doesn't Dave have a 70 on his car? I don't remember seeing an IAC relocator there... If you do order an angle boss, get it from John Pearcy at www.johnsperformance.com I usually get stuff next day from him since it's only coming from the Seattle area. The only other relocator I know of is the Champion one, and it's a slightly different design. I think they're similar in price.

I wanna ride shotgun when you do test n' tune.

 

[V6Power87]

Hey thanks for the info Rhett!!

I really don't know what I need..... I just wanted to have everything so I could race this weekend. I will get the turbo tomorrow night so we will see how it works.

Woody, I have an AC 9" nonlockup converter, it isn't the 3500 but the one step tighter one. It spools this 52 like a mofo!

 

[REDS HOT AIR]

i got a 4 to 3 adapter hose and using the 3" inlet pipe i've had on mine and it clears like that but dont see how it could clear with a 4" pipe

you need some fuel for 32# on a 70 at 23# my 50# injectors were done .... now with the 75's it might hang to 30+# once i get a better pump and line on it.

oh yea im not scared of boost either

 

[Chris McDade]

Yes,
You will need the angle boss with the 4 inch inlet. It makes it alot easier to install the the inlet hose. You can run it with out the angle boss but it will hit the IAC.

I just bought one from www.bopengineering.com the make a nice one for $59.99.

Good Luck

 

[Scott231]

I too assumed I would need to "alter" the IAC input to allow for my PT70-1. But instead of spending over $60, I spent $8 at NAPA to get some weatherpack connectors, was going to chop off the end of the IAC connector and solder on some new wires to the new Weatherpacks connectors that would be 10 inches away from the inlet tube.

Installed the PT70-1 and lo-n-behold, the stock IAC fit just fine without having to do the re-wiring trick.

Your actual results may vary...

 

[V6Power87]

Thanks all for the input!!

 

[KendallF]

I have had the same 4" inlet turbo on my GN with a 4 bolt turbine housing and ATR headers (I needed the IAC relocator) and now with a 3 bolt turbine housing and stock headers (I don't need the relocator). I have a 4" inlet hard MAF pipe that I made just to clear the IAC, however. Bolt the turbo on first and see.

 

[LikeMy6]

Dan, I will agree with woody the 70 is too big for a stock longblock I have one on my car right now,the motor is still all internally original( - chain and springs) Im using a solid 4" MAF pipe,4"MAF sensor,and 4" cold air kit w/t k&n filter. to make it simple IT SURGES BADLY! Ive had it up to 28#s of boost and still surges tho not as bad as when its at 23#s or less. Man it sometimes will surge so bad that the air will reverse out the compresser then thru MAF confusing the ecm by disrupting air flow thru the meter,resulting in loud pops. not good and sounds like crap! hiss hiss hiss hiss all the way down the track.The motor will need a cam heads and intake to make proper use of that turbo. I bought it for my stage2 motor but wanted to see how the stock motor would do with it,NO FUN!

Later

Frank

oh and BTW you can keep the IAC in the stock location but the hose or pipe will come in contact with it,nothing major. I did buy the angle boss from johns performance I didnt like seeing the pipe up against the IAC looked tacky. also you will have to get an after market upper manifold or a spacer for added clearance because the up-pipe will hit the MAF pipe.

 

[Chuck Leeper]

T-70??

The T-72 on my engine, even w/ the BGC intake, needed a 1/2" spacer on the plenum. 1/2" could cause the vac block,[aftermkt alum] to hit the hood liner.
Additionally, I had to relo the IAC and if using a 4" hard pipe inlet, the Eastern Perf pipe will hit the belt tensioner/alt mount. I moved the alt over some 4", w fabricated brackets.. LOTSA work!

Concerning Frank's comments on surge.. You have a turbo that has a compressor map way out of range for the CFM requirements for the engine. Severe surge can cause the turbo to fail.. as in breaking the shaft, shucking blades,creating havoc w/ performance.. GOOD luck!

 

[REDS HOT AIR]

only surge i've gotten from mine is when the injectors topped out and 02's fell

which was around 23# it leaned out but running itat 20-22# driving in traffic and all it worked just fine

i think most of what you'll are getting is from wastegate opening erratically im running deltagate with dial regulator for boost control

and may be the fact mines a LT70-1 not a pte 70-1

 

[Scott231]

Originally posted by REDS HOT AIR
only surge i've gotten from mine is when the injectors topped out and 02's fell

The point is, Frank has a stock cam and original unported heads. His motor is not capable of flowing the air that a turbo with a 70mm compressor wheel can flow. Thus...the surging.

 

[TType85]

It doesnt take much to get the turbo not to surge

I have a Limit Eng. P-Trim 70 on my car with a 214/208 cam and only a little bit of work behind the valves (no real portin). I run it at 15psi on the street, no surge.....

BTW, the car is much faster with the 70 vs a stock turbo

 

[TurboTR]

One way you may be abe to get it to stop surging is to put a restriction in the inlet piping. Sounds counter-intuitive (and counter productive , but it can work to at least stop the surge. Of course the best thing is to better match the turbo to the application in the 1st place

TurboTR