Opinions on turbine housing size & traction/slipping?

[BAD300]

Guys. Concerning the GT3540R .63 A/R I have purchased for the 300E. My techi assures me that the smaller .63 turbine housing will in fact result in greater wheelspin. Easier to lite them up so to speak. Also. Gentler on drive chain (I see the paradox here ....or am I wrong?)

I chose this housing over the larger .84 A/R not so I could lite em' up fast but to spool quicker & allow for more linear response....this is where I am bamboozled! If the response of the .63 housing is more linear (powerband) then wouldn't it be gentler on the tyres & drive chain in general? Workshop guy disagrees He maintains that the larger .84 housing, whilst coming on harder (all @ once, less linear response) it still will be gentler on the tyres. Maybe not the drive chain as it will kick in harder but still easier on tyres so in fact, less spin.

ALSO......take into consideration I am running auto trans with stall converter. Stall is around 2500rpm. I would imagine this will help alleviate early wheelspin @ least.

P.S. I know the larger housing will spool slower, again what I don't want really, but it's it's behaviour on the rear end that I want to convince myself of. Turbo is already made up but it's better to swap over housings now prior to fitment onto manifold than to have to disconnect stuff & take it off & swap out later

Pls people who have had experience with different housings or anyone clued up in this area comment. Anyone is more than welcome to chime in as I need to have closure on this side of things.

Thanks i advance

[RBYCC]

You're over thinking the installation....
Get the turbo installed and then consider what you must do to the chassis to handle the power.

[Turbo E320]

I managed to destroy my 97 722.6 trans with a T3/60-1, also with a .63 T3 housing. Power comes on quick and the car will have a ton of torque but when it comes time to shift it will be well past the torque curve. The 722.3's are a little stronger but I'd pedal back on shifts anyway.

With the new Precision billet wheel turbos out it kinda makes Garrett's GT line look inferior. The Precision's 6765 is a lot like the T67 but spools faster and can make 100-150 more peak hp.

[BAD300]

......after speaking with Mr Turbo, who put my turbo together, turns out this billet GT3540R is nothing more than a GT3582R Garrett although, spec-for-spec, slight trim difference plus mine uses the better parts in the install

All that crap on the net for nothing

I think as I've mentioned previously. What this essentially equates to is a big-ass blower that spools like a smaller blower yet, powers like a bastard! It's not a GT40 comp wheel at all! That would be up the shat with silly lag & only good up top for drags etc.....not what I'm after @ all. God no!

Mr Turbo Specs are:
Compressor - Wheel 82mm/56 Trim .70 A/R (farkin, huge )
Turbine - Wheel 68mm/84 Trim .63 A/R (again, huge )
*Uses a T04S compressor & T3 inlet flange (I thought T3 exhaust flange myself?)
Rated to 600hp

Garrett trims may be a little different?

Mr Turbo reckon the GT30 series is best on 1.8-2.0L engines. Fark wonder what engines he's talking about? Cosworth? I think these dudes are a bit too extreme wouldn't you say?

again.....I can breathe easy.....phew

[BAD300]

Originally Posted by Turbo E320

I managed to destroy my 97 722.6 trans with a T3/60-1, also with a .63 T3 housing. Power comes on quick and the car will have a ton of torque but when it comes time to shift it will be well past the torque curve. The 722.3's are a little stronger but I'd pedal back on shifts anyway.

With the new Precision billet wheel turbos out it kinda makes Garrett's GT line look inferior. The Precision's 6765 is a lot like the T67 but spools faster and can make 100-150 more peak hp.

Thanks for advice Turbo E320.

I'm not running a Garrett but a custom turbo using Garrett gear but billet alloy comp wheel & ceramic bearings as opposed to ****ty BB Garretts with plastic roller cages. Essentially, I am getting the turbo you refer to & it's 600hp rated Quickest spooling one around as far as I know

[BAD300]

I've decided to take Romans advice concerning the dynamics of these engines & how they work up top & not so much down low so, in order to take advantage of their inherent performance characteristics, I've decided to swap turbine housings. I will run with the .84. & not the .63. I may as well swap it now while it's sitting on bench than later after it's fitted to the car.

I don't want the back pressure & accompanying heat on the turbine wheel & inlet parts that the smaller housing would create. Besides. The better economy & higher hp I think kinda speaks for itself

Just so happens workshop has an .84 housing from a commodore they worked on so it isn't a big deal.

[Dearlove]

Hey mate, ideally you want the turbo to spool just before 3k(for a red line of 7k) that way driving round town your not on boost anddont chew through heaps of fuel, what Ed said is true, your just going to have to wait to see on e it's in the car.

Also the reason a quicker spoiling turbo is hard on things is it produces lot of torque down low, which in turn is hard on things, as apose to the larger one which produces torque after your already moving. Hence why Honda's can have such light gearbox/diff because they produce all there talk (which isn't that much compared to a boosted 6) which in turn makes them lighter /quicker

Sorry if there mistakes, written on I pod

[BAD300]

Originally Posted by Dearlove

Hey mate, ideally you want the turbo to spool just before 3k(for a red line of 7k) that way driving round town your not on boost anddont chew through heaps of fuel, what Ed said is true, your just going to have to wait to see on e it's in the car.

reason a quicker spoiling turbo is hard on things is it produces lot of torque down low, which in turn is hard on things, as apose to the larger one which produces torque after your already moving. Hence why Honda's can have such light gearbox/diff because they produce all there talk (which isn't that much compared to a boosted 6) which in turn makes them lighter /quicker

Sorry if there mistakes, written on I pod

Hey Dearlove,

Yeah. Precisely the reason I listened to sound advice & chose the bigger housing. I know it will come in stronger but, @ a higher rpm where it can work better & still give power up top end where the M103 works it's most efficient. Plus I have the added bonuses of better economy around town due to lower rpms/boost whilst have the power up top to get a good hp reading. Something I will be happy with I'm sure as an all-rounder. Pretty much what you have said
Funny though as one member is worried that due to the larger housing spooling slower & building power, it will result in more stress to running gear & light the wheels up even worse as it comes on harder.

I'm with you & the workshop on this so yeah, will just have to ride it out now & see on d day