2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

I have another NA turbo build idea.

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Old Apr 18, 2009 | 01:30 AM
  #1  
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I have another NA turbo build idea.

Ok guys.

This is much more plausible and somethign I want to do in the nearer future. Like within the next ten or fifteen years. Seriously, probably in the next 9-12 months after i finish my ls1 swap into my vert.

I have an s5 with my s5 vert motor in it now. The motor runs great. The s5 motor that was in it before blew coolant seals and jackets.

I have another s4 motor with blown rotors in my shop as well. Irons are great.

So this is my idea. Pull the s5 running motor and sell it for at least 500 bucks. With this I will buy s5 turbo manifolds, intake and exhaust manis.

I will buy a rebuild kit, with fd corner seals. I will use the s4 na irons with the s5 rotors and rotating assembly. I will do a full emissions block off and keep the six ports for sure. I want to run high compression and six ports. If you guys think running turbo rotors is better then let me know, along with a damned good reason. I feel with a good tune I will be fine, and run less boost.

I know I will need to run an s5 t2 ecu with S-AFC, boost controller, all that. I will also need to run oil lines and all of the associated fittings. I will also need to run a front mount intercooler.

Im looking to make around 350 horse.

I have a t2 tranny available as well.

What do you guys think about this since I have everything available already for the core. A great streetport would be awesome as well. Feedback would be great. Imagine owning an ls1 vert and a turbo streetported six port motor.

Oh yeah. Fuel injectors and pump.

Bottom line is why waste my time rebuilding a jspec motor and paying freight for it when I can rebuild what I have and play with it AND do something unique.
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Old Apr 18, 2009 | 01:38 AM
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Off topic, you have a thread following that swap? Saw a fd last night with a ls1 and pro charger. It was super sick, so now I'm thinking about it
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Old Apr 18, 2009 | 02:00 AM
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20 b fc is about the most exciting. I may take some pics tomorrow actually.

I just dont want to be a cocktease like Juiceh making people addictively watch a thread for a few years in jealousy and anger and rage waiting for some type of closure or feeling of satisfaction, not that I ever felt such a thing
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Old Apr 18, 2009 | 06:32 AM
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high likelihood of a blown motor on this engine management setup. You NEED precise timing control for a high compression turbo setup! NEED NEED NEED! that's even if the AFR ends up being rich. Rtek 2.1 is the minimum for this setup. and you better find someone who knows what they're doing to tune it.

and you're going to need either one of the larger hybrids or a full turbo upgrade (manifold etc).

add $3000 to what you had budgeted in your head if you want it to be reliable.
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Old Apr 18, 2009 | 08:00 AM
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ok so what if I use the same irons and housings from the six port but get s5 turbo rotors?
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Old Apr 18, 2009 | 09:29 AM
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Deff get turbo rotors, high compression boost is a waste of time and money IMO
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Old Apr 18, 2009 | 10:54 AM
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The stock ECU is a dead end. For this setup you need proper engine management.

Why not use the S5 irons?

There's no reason to port the intake ports as the NA already has a huge amount of port area and very late closing. Definitely port the exhaust.

Originally Posted by FelixIsGod29X
Deff get turbo rotors, high compression boost is a waste of time and money IMO
Please elaborate.
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Old Apr 18, 2009 | 11:26 AM
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+1 to what arghx said. 350whp is definitely getting near the standalone territory, the highest I've seen with an RTEK ECU is at little over 350whp. Any setup with the stock ECU and SAFC will have to run a lot of safeguards (low boost, timing, race gas, AI, etc.) that will cost you power to make up for the poor (RPM based) engine management. With the SAFC setup I'd say 300whp is max with a hybrid turbo but I could be wrong.

And don't worry about the rotors one bit. Nirtoracer7 is running 18psi on a T70 on his 9.7:1 rotors and putting down good numbers. You can always run AI or even do an E85 conversion if you'd like.
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Old Apr 18, 2009 | 05:48 PM
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so turbo rotors or not? I want to get a concensus on this. My s5 irons are toast. The water jackets are busted around the seals
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Old Apr 21, 2009 | 11:48 AM
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bumpity.


So this is what I will need versus what I will have.

I have:

t2 tranny
blown s5 na motor (bad irons, good housings and rotors)
blown s4 na motor (good irons, bad housings and rotors)

Need-

S5 t2 intake manifold and some turbo
Exhaust manifold from s5 t2
s5 t2 rotors
rebuild kit
exhuast - no problem
standalone
fuel pump
injectors
front mount intercooler.


What about the oil lines for the turbo?
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Old Apr 21, 2009 | 12:27 PM
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For the oil lines you can buy an oil filter pedestal from banzai racing and a 3 foot SS oil line (find a plumbing place around you). Tap the oil inlet port on the turbo with a 1/8" NPT tap, buy a 90* male to female fitting (1/8" NPT) and two male to female straight 1/8" to 1/8" fittings with a swivel. Pedestal>swivel fitting>90*>oil line>swivel fitting>turbo. Sounds like a lot of work but its easy as crap. Be aware that now you can only use oil filters that are no bigger than the circumference of the pedestal itself or it will rub the fitting (fram/mazda etc.). You could use another fitting to change this if you wanted though.

For the drain you have two options:

Remove oil pan, weld 1/2" female barbed fitting, buy ~10" SS hose (open ends), cut stock drain hard line, connect with SS hose and use hose clamps. With this setup you are most likely going to be positioning the fitting below the oil level which can build backpressure. Although Aaron Cake has ran this setup for a while with no problems, I've only put ~5k on mine.

Or just go the labor intensive way and install a TII front cover. This is a much better setup. Good drain and less heat exposure from the exhaust manifold.
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Old Apr 21, 2009 | 12:33 PM
  #12  
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Originally Posted by Aaron Cake

Please elaborate.
I can elaborate... It'll go something like "well I heard" hearsay.
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Old Apr 21, 2009 | 01:56 PM
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Ok Ok. I understood that in my last thread. Sorry about that. I wasnt sure how the stock t2 motor ran its oil lines.

So it will be the same deal with fittings.

Ok so with all of that being said do you guys think it will work fine and dandy using those parts?

I think a microtec would be fine. I just have no idea how the hell to use the thing.
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