What Do I Need For a Hy35 Upgrade? - The Saab Link Forums

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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 12-03-2012, 01:32 PM   #1
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What Do I Need For a Hy35 Upgrade?

Obviously new lines...an oil-flow reducer...a T3-T25 flange adapter? Does it require an A/C removal? I have given up trying to find an Hy30 and the Hx30's seem only slightly less rare while being nearly as laggy as the Hy35.
Will I need bigger injectors? I'm running 630's and W/M...
I assume my viggen clutch&PP will not hold, though some on these boards have the vig clutch &PP running ~400wtq.
Thanks,
-Cm
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Old 12-04-2012, 11:21 AM   #2
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Will it even fit? Do I need a special manifold? Do I need to cut the fan shroud/remove the stock fan? Is this setup really that "out there"?
If it were you would you put around on a loaner stock turbo and save for a 3071?
-Cm
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Old 12-04-2012, 11:39 AM   #3
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PM Comtrang.. He'd prolly be the best person to talk this over this.
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Old 12-04-2012, 12:44 PM   #4
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Since you asked, why not just rebuild the T28? Its a lot cheaper than making a totally new setup. If the EGTs are too high lower the boost. I can't remember exactly why the T28 blew from your other post, but I'd say if you just want to get the car running again do the T28 and get the setup ready for the 3076 next year or later.

At least with the GT30 you can base your setup off of Christos' rather easily along with numerous others who have done this and documented it. This is at least my plan for a big turbo setup in the distant, 3-5 year, future. Just my $0.02 though...
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Old 12-05-2012, 09:41 AM   #5
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Since you asked, why not just rebuild the T28? Its a lot cheaper than making a totally new setup. If the EGTs are too high lower the boost. I can't remember exactly why the T28 blew from your other post, but I'd say if you just want to get the car running again do the T28 and get the setup ready for the 3076 next year or later.

At least with the GT30 you can base your setup off of Christos' rather easily along with numerous others who have done this and documented it. This is at least my plan for a big turbo setup in the distant, 3-5 year, future. Just my $0.02 though...
It's not, and the EGT's aren't what what blew it.Housing cracked due to internal stresses. Rebuilding the T28 is going to be the cost of a Holset.
-Cm
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Old 12-05-2012, 09:44 AM   #6
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Comtrang has an Hx35-different setup. The Hy has a single scroll 9cm^2 exhaust housing with a T3 fitting,IIRC. The Hx is twin scroll and 12cm^2, hence the need for a new manifold.
The different exhaust housings are the reason I'm asking...anything else and I could look up the great build threads on here.
-Cm
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Old 12-08-2012, 10:15 AM   #7
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If You like lo cost way You can reverse turbo ( exhaust pipe close to water pump and timing chain side and air delivery from gearbox side - like 9000) . Quite tight but fit .
To stick hy35 t3 flange to t25 saab mani I made adapter from 12 mm thick steel with t25/t3 stud pattern - but You are limited in power - split pulse mani is way to big power ....

Slim 12 - 10 inch fan off ebay
Block water lines - hy have oil only
and goooo !!!
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Old 12-08-2012, 10:08 PM   #8
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Originally Posted by onyx100 View Post
If You like lo cost way You can reverse turbo ( exhaust pipe close to water pump and timing chain side and air delivery from gearbox side - like 9000) . Quite tight but fit .
To stick hy35 t3 flange to t25 saab mani I made adapter from 12 mm thick steel with t25/t3 stud pattern - but You are limited in power - split pulse mani is way to big power ....

Slim 12 - 10 inch fan off ebay
Block water lines - hy have oil only
and goooo !!!
Why do I have to reverse the turbo? Will it not fit in the conventional orientation?
What about oil-feed restriction? From what I've seen this is a must!
How is your spool? By what RPM do you see ~10psi?
Thanks for the tips thus far!
-Cm
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Old 12-14-2012, 03:51 AM   #9
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If You will use stock manifold big turbo as a hy35 will hit engine block ( no space) if You reverse it removing fan is ok with stock mani - space for dp and intke is ok as well....

spool depend on hot side size - if You have hy35 with 8cm2 or 10cm2 should be good spool from 3000 - 3500 rpm ale really nice top end power

anyway smaller better in your option cause stock manifold is good up to 400+ horsepower and hy35 is rated up to 450 hp so it can be lot of fun

on the other hand You can use very thick spacer between head and manifold like 20 mm or 30 mm thick to move turbo from engine block towards radiator but slim fan is a must then as weel -it can save You wrok with DP



Quote:
Originally Posted by Cm452 View Post
Why do I have to reverse the turbo? Will it not fit in the conventional orientation?
What about oil-feed restriction? From what I've seen this is a must!
How is your spool? By what RPM do you see ~10psi?
Thanks for the tips thus far!
-Cm
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File Type: jpg 5334515762_02244f8f65_b.jpg (103.7 KB, 36 views)

Last edited by onyx100; 12-14-2012 at 03:54 AM.
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Old 12-14-2012, 01:09 PM   #10
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Originally Posted by onyx100 View Post
If You will use stock manifold big turbo as a hy35 will hit engine block ( no space) if You reverse it removing fan is ok with stock mani - space for dp and intke is ok as well....

spool depend on hot side size - if You have hy35 with 8cm2 or 10cm2 should be good spool from 3000 - 3500 rpm ale really nice top end power

anyway smaller better in your option cause stock manifold is good up to 400+ horsepower and hy35 is rated up to 450 hp so it can be lot of fun

on the other hand You can use very thick spacer between head and manifold like 20 mm or 30 mm thick to move turbo from engine block towards radiator but slim fan is a must then as weel -it can save You wrok with DP
Thanks a ton!!! Awesome! Do you think a big spacer like that is going to cause problems?
I'd like to do the spacer technique...
Also, I've only seen one variant of the Hy...how do I know what the hotside is? In fact, the only hotside size I've seen 9cm^2; never heard of the other variants.
-cm
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Old 12-15-2012, 12:28 PM   #11
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it can be problem with power sterrig pump cause its bracket is really close to exhaust manifold. - its your daily driver ?

did U already bougt hy35? - i had hy35 10cm2 54/76mm compressor wheel

its stampedinside exhaust inlet- 8 - 9 - 10cm2

if You want similar power and don`t want build split pulse manifold or redo downpipe maybe think about td05 20g off ebay?

in my opinion cheapest route with hy is reversed turbo and stock manifold
or top mount setup smilar to recent one from this forum
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Old 12-19-2012, 06:39 AM   #12
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Originally Posted by onyx100 View Post
it can be problem with power sterrig pump cause its bracket is really close to exhaust manifold. - its your daily driver ?

did U already bougt hy35? - i had hy35 10cm2 54/76mm compressor wheel

its stampedinside exhaust inlet- 8 - 9 - 10cm2

if You want similar power and don`t want build split pulse manifold or redo downpipe maybe think about td05 20g off ebay?

in my opinion cheapest route with hy is reversed turbo and stock manifold
or top mount setup smilar to recent one from this forum
Thanks! Regarding the 20g-I've heard that the 16g is the largest one should go on that platform (TD05). Supposedly the 20g is a lag-queen.
I'll look into it.
Thanks so much for your help and advice,
-Cm
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Old 12-19-2012, 07:41 AM   #13
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Quote:
Originally Posted by Cm452 View Post
Thanks! Regarding the 20g-I've heard that the 16g is the largest one should go on that platform (TD05). Supposedly the 20g is a lag-queen.
I'll look into it.
Thanks so much for your help and advice,
-Cm

largest one is td05-25g lag queen compressor 60 /80 similar to hx40
td05- 20g thus with 7 or 8 cm2 spoolin from 3000 - 3500 and have nice top end with 2.0 motor

there are few on ebay
i.e. kunigawa japan etc

but if U going locost maybe try one of gt30 china copy with t25 flange - heard that they are noot bad when rebalanced in good turbo shop
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