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Can't decide what single turbo to get.


Jake

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I'm struggling to decide between

  • the BoostLogic T61 kit (with DBB if they do it)
  • making my own kit up with a Garrett GT35R and either an Arnout cast manifold or a complete eBay/TurboFit kit and throw the turbo away.

I suppose the BL kit would be the easiest way to do it but I think the GT35R would be a better choice of turbo. I don't think there's going to be much in it price-wise.

 

 

Any thoughts or suggestions that would help me choose one over the other?

 

 

If I went for the Arnout manifold would I be able to use an off-the-shelf downpipe and midpipe from somewhere? Where?

 

 

 

(I've already got PE 650cc injectors, Walbro pump and a FMIC waiting to be fitted. I plan to fit this stuff and the turbo kit myself. I haven't decided which ECU to go for yet.)

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You can't use an off the shelf DP, but Arnout himself has a 3" pipeworks kit which consists of a DP and wastegate mounting adaptor thingy that plumbs the wastegate back into the DP. Here's what he said about it in his last email to me:

 

hi Simon

I do have a kit but the guy that made it didn't make it perfect. It's not a perfect fit, it needs two welds and you're done. I can ship you it or send pictures for you to check

 

I must chase him up again actually to see what exactly needs doing to it. I'm hoping to use this. Or you can do what John did and get an exhaust place to fabricate one. You would need a bit of custom fabrication for the intercooler pipe too, although you might be able to mod another one. I've been drawing up a big spreadsheet with all the stuff I'm going to need, I'll try and post the contents up.

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Here's my list, this is what you'd need to piece together a kit. Some of this stuff is extra to what you'd get in a Boostlogic or whatever kit but I'm going to use anyway:

 

  • Arnout cast manifold
  • HKS racing 50mm wastegate
  • GT35R T4 flange Vband outlet turbo
  • turbo coolant and oil feed and return fittings
  • T4 gasket
  • 7 x studs (for turbo to manifold and wastegate to manifold)
  • Arnouts custom pipework kit
  • Custom intercooler piping
  • HKS BOV flange (for attaching it to the intake side alu pipe)
  • 4" alu intake pipe (I think a simple straight pipe will do here)
  • 45deg 4" silicon coupler for above
  • Mikalor clamps for above x 2
  • 4" K&N air filter
  • K&N filter to replace IAC hose.
  • Hose for replacing heater hoses.
  • Weld in fitting for attaching crankcase blow-by pipe to intake pipe
  • Braided hose for above + fitting
  • Turbo oil feed/drain kit (I'm going to use the Boostlogic one)
  • Exhaust wrap, ties and heat coating
  • Turbo blanket
  • Hose anti-heat sheaths

 

Then my list of extra stuff to be added later is:

  • Air duct for front bumper
  • Air duct hose
  • Outlet for air ducting
  • Air box
  • Emanage ultimate & harnesses

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I'm struggling to decide between

  • the BoostLogic T61 kit (with DBB if they do it)
  • making my own kit up with a Garrett GT35R and either an Arnout cast manifold or a complete eBay/TurboFit kit and throw the turbo away.

I suppose the BL kit would be the easiest way to do it but I think the GT35R would be a better choice of turbo. I don't think there's going to be much in it price-wise.

 

 

Any thoughts or suggestions that would help me choose one over the other?

 

 

If I went for the Arnout manifold would I be able to use an off-the-shelf downpipe and midpipe from somewhere? Where?

 

 

 

(I've already got PE 650cc injectors, Walbro pump and a FMIC waiting to be fitted. I plan to fit this stuff and the turbo kit myself. I haven't decided which ECU to go for yet.)

 

 

Aghhh Jake get the ebay kit and i'll buy the turbo off ya dont throw it away dude!im looking at fitting one just to see how long it lasts and what it goes like :)

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the gt35r is an awesome supra street turbo, imo it's the best, excellent boost characteristics. i wouldn't go for anything any larger. horses for courses though, it's down to what you want. full throttle is very scarey.

 

again, i'd definately backup arnouts manifold. mine has been getting some serious use lately and it's working great. i got a custom downpipe (nothing available when i got one of the first manifolds) and midpipe made up for arnouts manifold in 4" to match the HKS titanium, all vband. i think it's too loud, sounds good just very loudly. don't bother with the ebay manifolds.

 

i built my own kit and it took a while but i took my time. obviously a shelf kit is a lot less work but i like the reward of research, spec and build, you just don't want to be in a hurry.

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Thanks for that Eyefi. I've been reading up on the GT35R and it looks great, just what I'm after.

 

 

Why can't you use (or mod) a regular single downpipe with the Arnout manifold? the position of the turbo outlet can't be that much different, can it?

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Go for a GT35R mate. im running a GT35R42 56P trim dbb A/R 0.7..it spools so fast and with a few tweeks can push out around 700bhp..
GT35R42 Is that that the right code? I can't find anything on it on Google.

0.7 A/R? I didn't think the GT35Rs came with a 0.7 hotside. Unless you're talking about the compressor side? What A/R do you have on the turbine?

 

I'm looking at the GT35R with the 0.82 A/R hotside but that'll not get anywhere near 700rwhp, certainly not on pump fuel.

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the only hotside AR available in t4 flange is a 0.82 which is my favourite size. other sizes will require an adapter, which is not good. some aussie guys used the 0.6 and picked up a few (under 100) rpm spool but lost a fair chunk from the top end.

 

the standard gt35r is a gt35 dbb turbine with a gt40 compressor in a 0.7 ar housing. it's also widely known as a gt35/40.

 

here's some examples of it's boost characteristics:-

 

+ve boost at 1800rpm

1.4bar by 2830rpm

0-1bar in 170rpm @ 3.5krpm

 

no antilag and amateur mapping, i'm sure there is better to be had. my next mapping job is to try and eek a bit more out of it.

 

the gt35r is one of the most expensive turbos, i found it was twice as much in the uk as it is in the states inc shipping, taxes etc. i got excellent service from atp and limit engineering in the states, both i would highly recommend doing business with.

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