TD04-15G vs TD04HL-15G spool-up time

[Pierre]

Hi,

I have a flat-flanged TD04HL-15G which I should be installing soon.

I am having last minute doubts, though.

As far as I know, my TD04HL-15G has the same compressor-wheel as the TD04-15G.

The latter has a smaller turbine-wheel, though, which I suppose should make for slightly quicker spool-up than the TD04HL-15G.

Quick spool-up is attractive to me.

I also suppose that the trade-off, with the smaller turbine-wheel, is slightly lower maximum output.

My power-goal is to stay inside the limits of what the M46 transmission can handle.

Will anyone comment on which 15G constitutes the best choice for my project, please?

Thanks.

[EricF]

In both of my B230FT TD04HL-15G powered cars, I saw peak boost around 2100-2300 RPM in fourth gear... Very quick-spooling turbo. Any quicker would just be silly.

[kyle242gt]

I ran a HL (conical) in front of an M46 at 15psi for a year or more, zero issues, and like Eric said, spool was silly fast.

Hopefully you have your engine management sorted? I had a bit of surge from spooling too fast.

[Pierre]

Thanks, Eric and Kyle.

Did you guys have any associated modifications: camshaft, intercooler, etc...?

My car is a 245 Ti.

If K-Jet can be made to handle it, 'silly fast' sounds good.

[thelostartof]

There is No TD04-15g ... .@ least there was never any volvo TD04-15g and NO ONE here has ever run one

they are all TD04HL-15g when it comes to volvo's

[Pierre]

If there never was a Volvo-specific TD04-15G, that takes care of my imaginary problem, then.

[IceCold4x4]

didn't BKDR make a TD04-15g? but ya trust me on the fact that spool up on the TD04HL-15g is almost too fast. LOL especially once it's on a DP and a ported manifold and housing.

<a href="http://www.putfile.com/pic.php?img=6311398"><img src="http://img2.putfile.com/thumb/8/22600484714.jpg" alt="Click to enlarge."></a>

that's how much it should be ported at a minimum

because look at a completely untouched angled flange housing, tell me which one would flow better?

<a href="http://www.putfile.com/pic.php?img=6311390"><img src="http://img2.putfile.com/thumb/8/22600484642.jpg" alt="Click to enlarge."></a>

[benflynn]

There is No TD04-15g ... .@ least there was never any volvo TD04-15g and NO ONE here has ever run one

they are all TD04HL-15g when it comes to volvo's
i have a greddy tdo4-15g, and i think bdkr, or one of the other guys ran a 13c-made 15g, but if you look at a 13c ex housing, john, you will see why it is not a great idea

[IceCold4x4]

ya i wish i still had a 13c housing laying around to compare to the new flat flange that's been ported it'd show how bad the stock stuff really is

[thelostartof]

because look at a completely untouched angled flange housing, tell me which one would flow better?

<a href="http://www.putfile.com/pic.php?img=6311390"><img src="http://img2.putfile.com/thumb/8/22600484642.jpg" alt="Click to enlarge."></a>

that is one of the volvo freaks .. as there are other factory angled outlet housings that have all of that meat removed and do flow much better

[benflynn]

you can pick one up when you get the dremal, the mistu box is deep indeed

i have 2 more angled housings too if one might do better

[kyle242gt]

Did you guys have any associated modifications: camshaft, intercooler, etc...?NPR IC, 3" exhaust, brown tops, K and T cams (T really made it spool), ported the hell out of it, MSNS-E with boost control, etc. Beefy clutch too ;-)

[BDKR]

i have a greddy tdo4-15g, and i think bdkr, or one of the other guys ran a 13c-made 15g, but if you look at a 13c ex housing, john, you will see why it is not a great idea

Yeah, I ran a 13c TD04H (as opposed to HL) hotside with a 15g cold. Spooled like a monster. Of course you pay the price for that on the top end. Just depends on what you are after.

Now a good deal of that fast spool was from having a decent MBC too. I have a Dawes MBC and it makes a significant difference.

I'd better add that I think the TD04HL is the better option with a good MBC. What little you lose on the bottom most likely won't be noticeable. The gain is that you'll most likely get better roll on performance, which really is a big deal depending on the kind of driving you are doing.