BTF, your a man after thine own heart. :]
Data. Turbos. Modding. Yep, preeettty satisfying.
I Implore you to keep us up to date with each piece of data graph or any other seemingly nonsensical piece of information you've got.
And I liked your "muddy" explination of the difference b/t a large turbo and a small turbo, there are many other factors there but those two, adiabatic and larger exhaust housing increasing the rate at which unevacuated pressure will fly away in a whisp of scalding gas.
I'm not gonna get into other explinations but, its funny. You would THINK 20 psi = 20 psi no matter what turbo assuming the same exhaust side, I mean Ideally.
But thankfully its not. By the way, anti surge houses actually work against one of the larger turbo benefits. In fact they suck, you're not gonna be surging on that anyways.
Yea I'm not superhappy about the anti surge housing. It appears to be drilled and tapped annularly for a inlet shroud. Looks like a future mod for the CNC to do...
Well I got the Tial SS housing on the way. It was about $150 more then the garrett housing but I figure why go round to square?
A 4bolt round to V-band is way nicer and allows me to do it in one piece, reducing production cost. Tha stainless construction will allow me to weld the Gate right to the housing (just like my vette) making the path a Tangent to flow as opposed to a right hand turn.
Hoping the Tial SS housing will be here on monday....
That being said Im waiting for the first Carbon/kevlar engine cover to tack over so I can put the Backer layers and mounts on.
Yellow/Black. It gives me kind of a headache to look at.
Whatchu guys think for the color of the lettering. Black or silver?
I think Black would go better than Silver. Just my opinion though.
__________________ Aggressive GXP at $25,995.00 shipping of $600, Manual Transmission.
Options:
Air, $960; Chrome Wheels, $545; PCQ, Premium Package (Leather), $525; Radio, 6-Disc with MP3, $495; Monsoon, $395; Premium Acoustic Headliner, $150; and Sport Metallic Pedals, $115; all totals $29,180.00. No XM/OnStar and NO Spoiler. MODS (RKSport/Magnaflow dual exit exhaust system, K&N filter, Ventureshield.
First 1000. Aggressive with everything, NO XM/OnStar. SOLD
~~~~~~~ NASSOA
Founding member
~~~~~~~
Opinions are what I assked for!
The only reason I say silver is it will stand out better on the herring bone pattern. The yellow gives me a charlie brown headache! lol.
Well done with breakfast, heading out to the shop to see how things cured overnight. Hopefully it's not so hideous that I can show you it. lol
I could mke a better call if I saw the cover hint hint. I have red with silver letters on mine now.
__________________ Red Bull Drift Team 2008
Solo Mach and High Flow Cat
Dejon Intercooler, Intake Elbow, BOV spring
Wester's Garage RACE tune II
JPM custom shifter.
Barney Juice with Militec-1
GM Auto-dimming mirror with OnStar and maplights
Rhys Millen Racing, RMR Style Bar. Peak RWHP 286.3, Peak Torque 313 ft/lbs.
SSR Type C wheels, Bridgestone Potenza RE-01's
DDM Works PINK Breastplate
here's just a single layer trail run of the mold. Ive since made some changes
1) sanded smooth for better finish
2) removed lettering in case of copyright woes
3) removed some high detail features that were giving me bubbles. (need mroe than 1 bar consolidation pressure.)
I like the yellow.
Last edited by BaldTurboFreak : 12-05-2007 at 08:51 PM.
put your hands together for GM. The turbo related hardware is VERY nice.
O-ring'd hardpipe with crimped flex. All banjo fittings with crimped flex in them.
Nice effort.
Turbo:
drain has to have the holes drilled from 4mm to 6mm.(ish) boltpattern is the same as Gt-28,30,35.
Coolant lines are a direct bolt in, "top" on needs to be bent in a vice a little.
Looking for a proper banjo bolt for the oil feed to use the stock line. I may have to machine them.
the downpipe is a whopping 4" going into the Cat. The oultet of the V-band housing is 3". that should allow a fabricated "eyebrow" over the 3" to return WG flow in front of the cat.
I was looking at the cat. It's pretty big, I think just a new end cap would help greatly with flow. The inlet side stamping is top notch.
I was thinkin.. how about a carbon/kevlar upper radiator shroud? maybe with an air inlet scoop? Z06 airfilter assembly?
The intake will be made from carbon fiber and use a 4" cross section. I'll be relying on my hardpipe data for this, hopefully it wont be that far off the mark as far as the MAF table is concerned. The Post MAF BOV return will be 2" to work with the Godzilla. Although the gen 2 mitsu/audi Bosch jobby will likely work just fine. (1.25" return)
Its going to reuuse the stock cast aluminum discharge elbow.
Just a few more hours of cad/cam and i think i'll be happy with the adapters.
just hiding the gate will be the next task. By the time Im done you should be able to pass a visual...
Last edited by BaldTurboFreak : 12-06-2007 at 06:55 PM.
It's going to be a bolt on either way. Im really suprised at how well it's falling together.
The external will return in an "eyebrow" above the 3" v-band, The stock d-p is 3.5"
If GM decided to put a larger turbo on this motor I wonder if they would stick with a BorgWarner or go with a different vendor.
Our current varient of the K04 is already one of the largest trims of this model. They have the K16 but it doesn't have the Twin-flow turbines and 1050°C technology that the K04 has. They've got the K24 which is used on the 2.5L i5 Volvo S60R (300HP), some Audis, and 993/996 GT2 Porsches. I wonder if it would be too big for our smaller displacement?
I really can't wait till they start making variable turbine geometry gasoline safe turbos besides the new 911 Turbo's designs. They've stated they plan to but it's a matter of pricing right now, they're freakin expensive, they've listed 2011 as an estimated time line...
Borg warner and Gm been in bed a long time. Im sure that has something to do with it
But as far as these two turbo's are concerned, the garrett turbo is worlds ahead in turbine wheel and perhaps compressor wheel tech.
Turbine on the BW is a straight blade wheel lookin like it was designed in the 70's. You look at the garrett wheel and it's sculpted using the latest in FEA and CFD.
The garrett turbine wheel is made from inconel, there are only a few refractory alloys that are tougher or that I hate machining worse. Waspalloy and hastelloy come to mind.
I do wish that there was a Tial SS diveded housing. If i wanted it bad enough I could machine an insert for it, but I think division unto the collector area will be sufficient. The wheel dia isnt that much different (about 10mm) so rotational MOI hasnt increased that much. Tack on BB vs journal bearing and about 10% more Eff across the board an I think the penalty in minimum boost threshold with be small.
Definitly not 8psi@1800 like we have now, but I doont think your gonna be takin a nap before boost arrives.
I have tried the VNT route before. On a Subie wrex. It's a major PITA from a engine control standpoint, making a TIP sensor manditory. It was the biggest problem with the subie project. You can close the VNT down so far you'll never get the boost your asking for, beacuse the exhasut cant escape.
