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> So, what would it take to twin turbo my 3.6L engine?
SirAndy
post Apr 19 2012, 04:43 PM
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What would it take to twin turbo my 3.6L engine?
There's a few obvious changes, but my guess is there's a lot more to it.

Could any of the newer factory setups be adapted to fit my engine?
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Andyrew
post Apr 20 2012, 10:14 AM
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So you wouldnt mind plopping down 15k and gaining 150hp?

When I bought my turbo for my Audi, I made a goal of spool, I wanted FULL spool by 3800 rpm. On my previous turbo I had full spool by 2700 rpm and in honesty it spooled to quickly. I would simply want to merge or drive a LITTLE quickly and it would just spool ridiculously quick. Keep in mind it being a 1.8L it doesnt have much daily driving tq below 2k so I would typically drive it 2500-3500. What I came up with was something that with the wastegate open as much as possible, will start making SOME boost ~ 2k and just keep pushing it up till its making full boost (at the moment) at 4k, which is 10psi (When I have my tuning software I'll adjust fuel trims and timing and close the wastegate more, which will decrease spool time. At that point the max i'll run is 30psi on race gas). Then it just pulls harder and harder till my ECU cuts at 7.2k, however I know this turbo will push me well into 8k rpms and still be within its efficiency.

If you REALLY dont care about the money, and you want twins.. your best bet would probably be a pair of GT2560's. This was what I had previously on my 1.8L, but in single form. It was the perfect match for my engine and it gave me an incredible spool factor but also pulled STRONG all the way to redline, Spool was literally instantaneous above 3500. Since you have twice the displacement, that should scale up. The 2.7L audi guys run them when they want 600+whp. You could even go a pair of GT28r's if you wanted more of a linear power band and not a big tq spike down low (This is the issue with small turbo's).

However if it was my money, I would make some calls to some of the turbo builders (034 motorsports is in your area, they do good work and have a dyno). And ask them what they think. I would think a nice GT35R or GT40 sized turbo (Comp turbo, precision, turbonetics are also good turbo's and have more advanced internals than the 20 year old Garrets) would work well. Heck with that size of an engine you could probably go journal bearing and cut your cost in half. A nice large Holset turbo off a diesel is what the cheap guys use when they want a factory reliable and big turbo for making big power..



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Rand
post Apr 20 2012, 10:33 AM
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QUOTE(Andyrew @ Apr 20 2012, 09:14 AM) *

So you wouldnt mind plopping down 15k and gaining 150hp?

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No, I think Andy just wants to think, hear, and talk about all kinds of options before deciding on his goals. Makes for an interesting thread.
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SirAndy
post Apr 20 2012, 10:39 AM
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QUOTE(Rand @ Apr 20 2012, 09:33 AM) *
QUOTE(Andyrew @ Apr 20 2012, 09:14 AM) *
So you wouldnt mind plopping down 15k and gaining 150hp?
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No, I think Andy just wants to think, hear, and talk about all kinds of options before deciding on his goals. Makes for an interesting thread.
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Posts in this topic
SirAndy   So, what would it take to twin turbo my 3.6L engine?   Apr 19 2012, 04:43 PM
ldsgeek   Many cubic dollars. Other than that I got nothing.   Apr 19 2012, 04:45 PM
mepstein   What about a supercharger? Way less plumbing. No i...   Apr 19 2012, 05:18 PM
JmuRiz   What he said...I know TPC used to offer this 3.6 s...   Apr 19 2012, 06:02 PM
ConeDodger   Superchargers do make a delicious whine as they wi...   Apr 19 2012, 06:04 PM
a914622   Doesn't the whine screw up the knock sensor? ...   Apr 19 2012, 07:02 PM
kg6dxn   Doesn't the whine screw up the knock sensor? ...   Apr 19 2012, 07:09 PM
iamchappy   All you need is one, two for cool factor only........   Apr 19 2012, 07:11 PM
kg6dxn   All you need is one, two for cool factor only.......   Apr 19 2012, 07:14 PM
SirAndy   What's you budget? Whatever i want it to be .....   Apr 19 2012, 07:20 PM
iamchappy   What's you budget? Whatever i want it to be ....   Apr 19 2012, 07:38 PM
kg6dxn   What's you budget? Whatever i want it to be ....   Apr 19 2012, 07:40 PM
Elliot Cannon   What's you budget? Whatever i want it to be ....   Apr 19 2012, 08:43 PM
iamchappy   The new variable vane turbos act much like having ...   Apr 19 2012, 07:15 PM
Andyrew   If your going to keep your 3.6, Why twin turbo? Wh...   Apr 19 2012, 09:25 PM
SirAndy   Whats your HP goal? 450? 500? 600? 700? No goal ....   Apr 20 2012, 12:03 AM
Elliot Cannon   Whats your HP goal? 450? 500? 600? 700? No goal ...   Apr 20 2012, 12:07 AM
kg6dxn   I think mine spools to quick. is that possible? I ...   Apr 19 2012, 10:06 PM
Elliot Cannon   I think mine spools to quick. is that possible? I...   Apr 19 2012, 10:23 PM
kg6dxn   I think mine spools to quick. is that possible? ...   Apr 19 2012, 10:39 PM
r_towle   For some reason I knew this was coming.... It may...   Apr 19 2012, 10:43 PM
McMark   Twin turbo might actually be easier on a 914/6 sin...   Apr 19 2012, 11:28 PM
Chris Hamilton   Sounds like you need twin garrett ball-bearing tur...   Apr 20 2012, 12:13 AM
jcambo7   Like this...   Apr 20 2012, 09:31 AM
Andyrew   So you wouldnt mind plopping down 15k and gaining ...   Apr 20 2012, 10:14 AM
Rand   So you wouldnt mind plopping down 15k and gaining...   Apr 20 2012, 10:33 AM
SirAndy   So you wouldnt mind plopping down 15k and gaining ...   Apr 20 2012, 10:39 AM
iamchappy   I bet using one k27 highflow on that 3.6 would be ...   Apr 20 2012, 10:35 AM
SirAndy   Thanks guys, this is giving me some good pointers ...   Apr 20 2012, 10:39 AM
pcar916   I haven't seen anyone mention what I would hav...   Apr 20 2012, 10:44 AM
SirAndy   I haven't seen anyone mention what I would ha...   Apr 20 2012, 10:47 AM
polo classic   I have been tinking about this too. I'm not th...   Apr 21 2012, 07:15 AM
Randal   I haven't seen anyone mention what I would h...   Apr 21 2012, 08:05 PM
Andyrew   This is why a large turbo is beneficial VS small t...   Apr 20 2012, 11:03 AM
Chris Hamilton   How about e85?   Apr 20 2012, 11:51 PM
Andyrew   How about e85? Not readily enough available. Ba...   Apr 21 2012, 10:06 AM
underthetire   He could then be called boosted corn from now on...   Apr 21 2012, 12:16 PM
rohar   I am disturbed by the lack of love for CIS in this...   Apr 21 2012, 03:45 PM
iamchappy   I am disturbed by the lack of love for CIS in thi...   Apr 21 2012, 05:30 PM
daniel951   i think the factory air cooled twin turbo would be...   Apr 21 2012, 07:52 PM
kg6dxn   Here are some dyno charts that compare turbo to su...   Apr 22 2012, 12:34 AM


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