[LSs1Power]

Why all the headache trying to keep the twins? Using a single turbo would free up some space and it can be sized to spool just like a 13G if thats what you want. Im sure a single GT3071R or GT3076 would spool up just like 2 13G's. These two turbos are going to be good for 400-500rwhp range and spool up around 2400-3000RPM on the 3L I6 high compression engine.

[LODOSS]

When i went from 9bs to 13gs on my vr4.. you really can't feel the additional lag.. what you do feel/hear is the turbo spooling and the higher boost that you can run and that can hold higher in the rpms.

I was running 16-17 lbs on 13gs and it held at 13-14 lbs to redline.

[turbotko]

Originally Posted by bnj

As far as I know Supra Mk IV and Nissan 300ZX come with cast pistons as stock. I could be wrong, but I doubt it. No car comes to mind that would have forged pistons in stock form. I guess those might exist, though.

The boost that can be applied is quite limited with 335i. Heat and inefficiency problems rise soon with the tiny turbos - even if upgraded.

Wow, and here I am thinking almost ALL production cars that were F/I from the factory had forged pistons. Most of the stuff I've dealt with is american, but all the american cars with F/I that I've dealt with had forged pistons stock. Turbo DSM's had them, all supercharged Ford modulars have them (the 5.4L GT and 4.6L cobra motors can take 4 digit power numbers all day stock), and the 2.3L turbo 4 cylinder that I ran in a ford Pinto had them.

That 2.3L motor came out of an 88 turbocoupe, had 188K miles on it, and laughed at the 25psi of boost and 100 shot of nitrous I was throwing at it at the track...........all without touching the short block. I sold the car but AFAIK it's still running strong on the same combo.

The turbo's are part of the exhaust manifold on the N54's, I've held a couple in my own hands.

[AWD Addict]

Originally Posted by turbotko

Wow, and here I am thinking almost ALL production cars that were F/I from the factory had forged pistons.

Not on the import scene anyways. The STI's have the hyper-e casting which is a bit stronger, but not forged, and all the WRXs, Turbo Forresters, Outbacks and Legacy's are cast.

And I could be mistaken, but I think the stock 4G63 blocks all came with cast pistons, not forged. I believe lots of the old DSM guys are using EVO pistons now, but they are cast as well (although substantially more beefy and lightweight). Most of Toyotas turbo engines did not include forged pistons (the mid 80s 4runners, celicas and pickups for example)

Come to think of it, the Nissan 300zx turbos had cast pistons too.

I don't know shit about fords, but I don't think your statement about forged pistons being OE standard is right. I think it's the exception. Many of these did have forge rods, maybe you're confused with that?

[dimmmi]

S2000s come with stock forged pistons, most likely due to the high rev limit.

[AWD Addict]

Originally Posted by dimmmi

S2000s come with stock forged pistons, most likely due to the high rev limit.

The OE S2000 didn't feature forced induction...

[A418t81]

Originally Posted by turbotko

Wow, and here I am thinking almost ALL production cars that were F/I from the factory had forged pistons. Most of the stuff I've dealt with is american, but all the american cars with F/I that I've dealt with had forged pistons stock. Turbo DSM's had them, all supercharged Ford modulars have them (the 5.4L GT and 4.6L cobra motors can take 4 digit power numbers all day stock), and the 2.3L turbo 4 cylinder that I ran in a ford Pinto had them.

There has ever been a single 4G63 to leave the factory with forged pistons. The Evo's are also cast, albeit stronger. My Evo's engine was bone stock other than cams and I made 425 whp on pump gas, drove it every day as the DD, and is still going strong with so much as hiccup with 77k on it now, 40k of that with the 35R (one of my best friends bought it so I'm able to keep up wiht it).

[AWD Addict]

So what's the biggest wheel we can cram into this housing? Has Forced Performance gotten back to anyone? They had some decent modified turbos for the WRX for good money (~$500). With the machining, ceramic coating and bigger internals, people were pretty happy with them.

There's nothing scientific to this statement, but if they were getting 13Ts up to 18Ts on the WRX, maybe we can get two 13gs into our TD03? something like that would be a nice bump!

[AWD Addict]

Originally Posted by AWD Addict

So what's the biggest wheel we can cram into this housing? Has Forced Performance gotten back to anyone? They had some decent modified turbos for the WRX for good money (~$500). With the machining, ceramic coating and bigger internals, people were pretty happy with them.

There's nothing scientific to this statement, but if they were getting 13Ts up to 18Ts on the WRX, maybe we can get two 13gs into our TD03? something like that would be a nice bump!

[A418t81]

As I recall, M&M, or one of his buddies tried fitting the 13G compressor wheel with poor results. The turbos surged badly. Its obvious that the TD03 hotside, at least stock without a clip, cannot support that kind of flow.

[AWD Addict]

Originally Posted by A418t81

As I recall, M&M, or one of his buddies tried fitting the 13G compressor wheel with poor results. The turbos surged badly. Its obvious that the TD03 hotside, at least stock without a clip, cannot support that kind of flow.

not surprising, it's tiny.

time to cut those snails off the manifold and weld something bigger on there! Dual 16gs would be a good start.

[JamesT335I]

not to kick a dead horse. but why dont we just do something like this????

seems legit

[boost junkie]

VTT Stage 2+ has 19t wheel. No independent results yet, though.

[MNick]

I think Dinan has a very NON cost effective product, though the exact specs are ambiguous, check out the link: http://www.dinancars.com/product/lar...ries&mid=1133/.

Funny how they tout "14 psi to 6k rpm" My last logs are 18 - 19 psi to 6K on stock turbos.