If you think those ole basterdized t2 flanged t3/t4 turbos hit hard down low try a pair of these around 3500RPM...

Bill

 

Looks like they got a line on some GT30Rs with a .63 AR in a T4 housing...Jose or Dalton should be letting me know today sometime.


I know there was some discussion previously on whether the GT30R was too small for a 346cid, and that a GT35R was more appropriate..but Jim's car worked fantastic with the GT30s and they were with a T3 housing. Jim had told me he wished he had got the .81 AR with those Turbos..but I sure liked the way the thing drove around on the street. I think with a .63 AR with a T4 housing..we should be in the low rpm spool up business....only time will tell.

 

ill be running te44 with AR of 58, hopefully should work well with 228 224 580 581 115 cam and catless and electric cutouts.

 

I would wait Nick...I really would. You don't want to be stuck with something that does not work the way you want it. Let PTK get it right on my car and then there will be no doubts....cut outs are band aid fixes or for an all drag car....you don't see them on any LPE cars. Phil already posted a map that showed the TE44 out of the "sweet spot" he might be irritating to me these days..but I still place some value on what the ole fart has to say.

It would be better to go with Hi Flo or gutted cats than having to use electric cutouts to make boost. The PT52s made 2lbs of boost at 3000 rpms with a .58 AR....they are not that much different than TE44s...the rpms need to drop close to 700rpms to spool in the "sweet spot". The changes from TE63s to PT52s have only netted a 600rpm drop for max spool up...that is two ARs on the TE63s and 1 set of PT52 w/.58 AR. Just some advice from somebody that has been there before..your choice my friend.

 

Kevin that hurts man. I'm turning 39 this year and am more than a few years older than Phil.

Anyone know how I get my AARP card??????????????????

Just kidding around hope the next set of turbo's get you what you are looking for.


Good luck can't wait to see what the setup yeilds when all is said and done.

Mike

 

Hahaha...Just a few years older..hell your barely older than me..I just turned 38..haha..w00t Im not the oldest.hahahaha

Shibobi,

Not a dam thing wrong with twin gt30rs. Used them on a 355 sbc and they were sweet. Never used them with a t4 exhaust though.
Based on the PTK system power at 9psi you sitting pretty good on the compressor map.

Phil

 

Older, slower, definitely poorer after a few kids, the things in life to look forward too.

Sorry for the hijack

Mike

 

Thank you guys for helping me feel young (turnin' the big 35 this year). I can always count on my fellow Vette enthusiast for something.

 

Hmmmmmmmmmmmm you guy's are a BUNCH of young ******!!!!!!!

 

Haha..Gary wins...

guess he buys Hooters next time around..haha

Oh, wait..there is always George (Torxzilla) to lead the pack..haha

Phil

 

You know I threw that in the middle of my posts just to see who was paying attention...looks like all the usual suspects.... . You know I have some respect for you guys..thats why I ask questions and choose to argue with you when they are not the same answers. Thanks for the input Phil.....I just turned 37 and can't stand it..getting older sucks. The guy I hit the gym with tells me, "just wait" until your my age....he is almost 50..but still a former Mr. Los Angeles.

I am assuming this will all be worked out soon and PTK will have a great TT kit out on the market to power some more C5s. Soi far they have been easy to work with...but the labor charges of switching things out are starting to nickel and dime me...so just wait Nick...we got Phils blessing on the GT30Rs and I have driven them on Jim Hall's car (T3 flange). We will see what we see.

 

Sweeet. Looks like I win the youngest award for our local group.

Shinobi'sZ - be happy - you could have ordered the HP kit a year ago and still been waiting.

Mark

 

The older I get the younger it sounds. Just remember, if you never grow up, you never grow old.

 

good advise kevin. still gotta boat load of work ahead of me. 1st stage or weekend if you will, tranny, rear, 02 tanks R&R engine. hopefully youll have it dialed in by the time wanna hang trhe dryers

what turbos are going to get you in the sweet spot, no t4 gt30r available

 

Hmmmm... a couple more years on you, and genetics will take over and compel you to either move to Florida permanently, or visit us around winter time and jam up our roadways.

 

ricer kid in town runs t3/4 gt30r and gets max boost @ 2800!!! i hope iam wrong but t4 not available if that the bomb, as far as turbos, how big of a deal to refab flange? cannot be that big of a deal(if off car!)

38 here, age just a #, best shape of my life,well not my joints. torn acl torn ac arthritis in ankle & knees uh........my muscles are the only thing holding me together!!!

 

read this... http://my.is/forums/showthread.php?t=242616


and this one too http://forums.beyond.ca/showthread/t-45934.html

 

I think there are other factors that contribute to spool up time. I have heard the GT35R would be the ticket..however I have driven a GT30R TT Z06 and it was awesome.

On those threads I don't know what other parts are making up the Turbo kit. We are sitting on a long tube header design, while it might be better for racing applications, I don't know how it is for more street driving and how it aids or takes away from spool up. I know they use them on all the Indy car designs..but they have all the tubes going into one collector and one very large turbo. We have 4 tubes coming out of 176cid per side...its like a big 4 cylinder...seems like the GT30R might be better suited for a 346cid. I don't know PTK didn't call me back today, and neither did Jose..but its Monday and maybe they don't know anything yet on the availability of the Turbos..otherwise I would take it as not a good sign.

 

Phil, are you using 60 lbs/minute as your air consumption for a stock cubed LS1? What RPM are you using for your engine speed?

 

What I use and when depends on whether or not I have any data.
You can quickly calculate consumption at a given boost level if you know the typical volumetric efficiency range of the engine. In this case it would be approximately 60lb/min@6500rpm at 9psi.
But, experience and data always overrides theoretical “guestimations” but, if your good they will overlap. An example on the Tti X at 9psi it typically makes 600 rwhpish. Rear wheel hp almost directly correlates to consumed airflow at a 10:1 ratio. You can even verify this on a dyno while logging the GM Maf output. So, via testing it’s flowing a net of 60lb/min which is 30lb/min per side. At this point all you need to do is overlay the data on the map. The PTK “system” generated 530/540 at 9si which is the second point I plotted on the graph closer to the sweet spot. The experience end of the equation is the knowledge in knowing what power (air flow requirements) a combination delivers for a given boost level. You can use that information as a starting point to plot the needs over a given boost range to attempt to “sweet spot” the turbo’s. In addition, this data can be used in part to look at turbine wheel selection but additional data like manifold BP and EGTs are needed to really get a handle on selection. Unlike the compressor side, a lot of other variables can come into play on turbine performance with tuning being one of them. An example is I run my bottom end fairly lean (12.0:1) with a fair amount of timing to soften the transition. This is especially helpful on the dyno to keep from spinning the tires and the street to keep traction and hopefully minimize broken parts. I think you can figure out the rest from here

Phil