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#"Best" Turbo for a 550 Robtune

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 Post subject: "Best" Turbo for a 550 Robtune
PostPosted: Fri Jul 08, 2016 9:02 am 
In Neutral
Joined: Sun Feb 21, 2016 10:14 am
Posts: 44
So I'm planning a 550 Robtune, TMIC with my 3" turbo back exhaust and am wondering what turbo to go with? Will the Robtune and 550's max out the VF11? I'm assuming so? I want the smallest fastest spooling thing that will flow enough to not be limiting me. I have found and read this http://forums.nasioc.com/forums/showthr ... ?t=1141476 and this http://forums.nasioc.com/forums/showthr ... ?t=1084275 but still don't know... I'd love to obtain a VF34... and I have a local lead on a basically new VF48...


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 Post subject: Re: "Best" Turbo for a 550 Robtune
PostPosted: Fri Jul 08, 2016 9:28 am 
Winestone Cowboy
Joined: Thu Mar 26, 2015 4:12 am
Posts: 325
Location: Lake Stevens WA
His tune is made for the TD05h and the green Maf. The Maf is what limits us/his 550 tune(among other variables) I am by no means an expert in his tunes, but the easiest I think would to go with a set up that has already proven to work. There are some Td05's still floating around with the 90 inlet.

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 Post subject: Re: "Best" Turbo for a 550 Robtune
PostPosted: Fri Jul 08, 2016 2:50 pm 
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Location: Des Moines, Wa
The stock ej22t heads are the limiting factor, and max out a 22t's potential between 250-300whp, depending on the dyno. So basically you want the fastest spooling turbo that can hit around 300whp. My vote is for the vf23. It is faster spooling than the vf34. A friend has one on his stock engine SS and the responsiveness is leagues better than my td05. The td05 has a huge top end push, though, and is better suited to dohc heads in this scenario.

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 Post subject: Re: "Best" Turbo for a 550 Robtune
PostPosted: Fri Jul 08, 2016 6:00 pm 
Winestone Cowboy
Joined: Thu Mar 26, 2015 4:12 am
Posts: 325
Location: Lake Stevens WA
Td05 runs outta breath around 6-6.5k in mine(not completely, just only pushes around 13psi and falling) so I want an 18g down the road

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 Post subject: Re: "Best" Turbo for a 550 Robtune
PostPosted: Fri Jul 08, 2016 6:20 pm 
In Neutral
Joined: Sun Feb 21, 2016 10:14 am
Posts: 44
Pntaste4evr99 wrote:
His tune is made for the TD05h and the green Maf. The Maf is what limits us/his 550 tune(among other variables) I am by no means an expert in his tunes, but the easiest I think would to go with a set up that has already proven to work. There are some Td05's still floating around with the 90 inlet.
That's why everyone uses those? Is it actually meant for that or is that just a really common turbo every one uses? A turbo is just a skinny compressor, any similar size and shaped one should work?

mike-tracy wrote:
The stock ej22t heads are the limiting factor, and max out a 22t's potential between 250-300whp, depending on the dyno. So basically you want the fastest spooling turbo that can hit around 300whp. My vote is for the vf23. It is faster spooling than the vf34. A friend has one on his stock engine SS and the responsiveness is leagues better than my td05. The td05 has a huge top end push, though, and is better suited to dohc heads in this scenario.
That was my thought too, a VF23 should do that? I just want the 34 for ball bearing goodness. I think I'm going to put in Delta power cams, DOHC swap seems like a lot of work with a lot of spots to go wrong. I read those guides but non list the CFM of the TD04/05 or VF11 so I have nothing to go buy.

Pntaste4evr99 wrote:
Td05 runs outta breath around 6-6.5k in mine(not completely, just only pushes around 13psi and falling) so I want an 18g down the road
Well thats redline sooooo......., my VF11 at 12.5ish psi seems to run out of push at 5500 and up but that could be fuel delivery too.


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 Post subject: Re: "Best" Turbo for a 550 Robtune
PostPosted: Fri Jul 08, 2016 8:34 pm 
Fifth Gear
Joined: Mon Mar 08, 2004 2:30 am
Posts: 2269
Location: Auburn, WA
All of the previous posts are dead on. The Td05 was the jdm Sti turbo used with the ECU Rob tunes. That is why it is the "standard". The heads on these engines suck. Both of my cars hit a "wall" due to the heads not being able to handle the flow. I would rather drive a td04 car with the good dohc heads and the right tune than the td05 with the 22t heads


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 Post subject: Re:
PostPosted: Sat Jul 09, 2016 3:54 am 
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Joined: Sun Feb 21, 2016 10:14 am
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dscoobydoo wrote:
All of the previous posts are dead on. The Td05 was the jdm Sti turbo used with the ECU Rob tunes. That is why it is the "standard". The heads on these engines suck. Both of my cars hit a "wall" due to the heads not being able to handle the flow. I would rather drive a td04 car with the good dohc heads and the right tune than the td05 with the 22t heads


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I'm planning on Delta cam's, the DOHC swap I would need to obtain head's, then the fuel rails from one car and run the timing belt and tensioner from one car and the accessory belt from another and sometimes the fuel rails don't line up and need to be bend or have extra holes drilled.... and then does the Robtune even work on a DOHC swap? I think a DOHC swap is kind of over my head, I was looking at the pros and cons of EJ25D heads vs 2.0 heads and even got lost... Maybe when I rebuild the bottom end I'll put it back together with DOHC heads but for now I just want a different turbo to put on with my TMIC and such.

I thought the Robtune was a EJ20G ECU that had twin turbos?


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 Post subject: Re: "Best" Turbo for a 550 Robtune
PostPosted: Sat Jul 09, 2016 4:51 am 
Winestone Cowboy
Joined: Thu Mar 26, 2015 4:12 am
Posts: 325
Location: Lake Stevens WA
I daily drive my EJ20g DOHC 550 Robtune with the Td05. No problem. Works awesome

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 Post subject: Re: "Best" Turbo for a 550 Robtune
PostPosted: Mon Jul 11, 2016 8:55 pm 
Fourth Gear
Joined: Mon Aug 31, 2009 9:09 pm
Posts: 1204
Location: Rochester, WA
Pntaste4evr99 wrote:
Td05 runs outta breath around 6-6.5k in mine(not completely, just only pushes around 13psi and falling) so I want an 18g down the road


You might have an issue then. MBC? My old 94 had no problem holding 18psi to 7k with a 20g/TD05 RobTune combo. Held 18 with the 22t too, but I only revved that combo to 6kish.

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 Post subject: Re: "Best" Turbo for a 550 Robtune
PostPosted: Tue Jul 12, 2016 1:05 am 
Winestone Cowboy
Joined: Thu Mar 26, 2015 4:12 am
Posts: 325
Location: Lake Stevens WA
Yeah running a MBC...tappers off to around 13ish. My buddies does the same thing with his same set up as me. If there's somethings wrong, I'm not smart enough to figure it out???

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Original WA car with 450k miles and climbing


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 Post subject: Re: "Best" Turbo for a 550 Robtune
PostPosted: Sun Jul 17, 2016 5:36 am 
First Gear
Joined: Sat Sep 19, 2009 6:21 am
Posts: 211
Location: Orem, UT
I'm running a 550 tube and a VF23 on a 22t with 20g heads, spools real fast and carries well to 7k

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