TO4B On These Mods....
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From: Lubbock,Tx
TO4B On These Mods....
Looking at getting a T04B with a .60A/R cold side,1.15 A/R Turbine and divided flange.
These are the mods I already have:
Walbro 255
Greddy 720 sec.
Ported Wastgate
Apexi AVC-R (Going for around 10-12 psi)
New fuel filter
3" Turbo back Motoria Exhaust
Rtek 1.7 ECU
Removed Split Air Valve , ACV and Sub Zero Assist
Mods Coming:
Wideband
Apex'i Neo
FMIC
The engine is still on stock ports as well. It's an 87 T2 S4
Also if possible could I just do pipes to fit on the top mount intercooler? I know it isn't recommended.
I would go standalone but just alittle high at the moment.
Don't plan on running extremely high boost levels. I am thinking right now between 12 to 14 if possible.
Mike
These are the mods I already have:
Walbro 255
Greddy 720 sec.
Ported Wastgate
Apexi AVC-R (Going for around 10-12 psi)
New fuel filter
3" Turbo back Motoria Exhaust
Rtek 1.7 ECU
Removed Split Air Valve , ACV and Sub Zero Assist
Mods Coming:
Wideband
Apex'i Neo
FMIC
The engine is still on stock ports as well. It's an 87 T2 S4
Also if possible could I just do pipes to fit on the top mount intercooler? I know it isn't recommended.
I would go standalone but just alittle high at the moment.
Don't plan on running extremely high boost levels. I am thinking right now between 12 to 14 if possible.
Mike
Whats an apexi Neo? I'm almost positive you won't have enough fuel for those boost levels. You can use the stock top mount if you want to run pig rich, or run relatively low boost levels( under 9psi I'd say from experience depending on ambient temps). I hope you're not getting a ebay to4B from china...
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From: Lubbock,Tx
The Neo is the new Air/Fuel controller from Apexi.
http://www.apexi-usa.com/news_article.asp?id=15
Yeah, I figured I would have to bump up the fuel as far as injectors go. I figured I would just need to bump up the secondaries.
Mike
http://www.apexi-usa.com/news_article.asp?id=15
Yeah, I figured I would have to bump up the fuel as far as injectors go. I figured I would just need to bump up the secondaries.
Mike
a 1.15 a/r turbine is going to be a monster flowing turbine, and not good for spool in a two rotor unless its bridge port or something. As for me, and others I have seen, I always ran .96- 1.00 fully divided, and is a great blend of spool and flow for top end. Generally speaking. In your case you may like a .86 a/r even better, as it spools VERY nice, but a large wastegate is a must.
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From: Lubbock,Tx
I figured it might be to large unless I basically wanted to start over on my setup.
Would the .86 work with the Rtek 2.0 or is a standalone still needed? and what kind of power can be expected from that vs the regular S4 ported wastgate I am doing now?
Mike
Would the .86 work with the Rtek 2.0 or is a standalone still needed? and what kind of power can be expected from that vs the regular S4 ported wastgate I am doing now?
Mike
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From: Lubbock,Tx
Well from Reted and his FC3Spro site here is the specs on the swap:
Would running 4 720's make much difference as far as pushing the boost on the S4 turbo?
Mike
The compressor upgrade or hybrid upgrade is a very popular choice for a turbo upgrade. The stock turbine and center housings are kept, so installation is simple. Most times the stock turbine wheel and center shaft is kept, but it is possible to even change that part.
The compressor wheel is upgraded to a larger unit, and this is where the increased power is made. With the larger wheel, this will require machining both the backplate and compressor housing or replacing both with larger units. Since Garrett parts are easy interchanged with the stock Hitachi stuff, most popular comp upgrades are from Garrett series turbos. Most popular are the V-trim, H-trim, 60-1, TS04, and T04E "60" wheels.
The V-trim wheel is the smallest size listed, but power potential can be up to 300hp at 15psi of boost. Boost response will be like stock, even with the significantly larger compressor wheel. The V-trim compressor wheel is small enough that a machined stock Hitachi back plate and compressor housing can be used; this makes for a good economical upgrade as you only need to purchase the V-trim wheel and machine the stock pieces.
The H-trim is the next size up, and power potential jumps up to 350hp. The H-trim does a little lag to spool-up, but most people won't notice the difference versus the stock turbo. We've seen H-trim compressor upgrades use machined Hitachi pieces or Garrett H-trim back plate + compressor housing.
At the largest end, the 60-1, TS04, T04E "60" all produce around the same amount of horsepower, as compressor wheel sizes are similar. Power potential will start to edge close to 400hp! Due to the sheer size of these compressor wheels, a larger back plate and compressor housing is mandatory. The 60-1 compressor housing is so large, that on a Zenki engine, you might need to grind down part of the compressor housing to clear the lower intake manifold.
It is possible to go larger (compressor wheels), but fitment will be an issue.
The compressor wheel is upgraded to a larger unit, and this is where the increased power is made. With the larger wheel, this will require machining both the backplate and compressor housing or replacing both with larger units. Since Garrett parts are easy interchanged with the stock Hitachi stuff, most popular comp upgrades are from Garrett series turbos. Most popular are the V-trim, H-trim, 60-1, TS04, and T04E "60" wheels.
The V-trim wheel is the smallest size listed, but power potential can be up to 300hp at 15psi of boost. Boost response will be like stock, even with the significantly larger compressor wheel. The V-trim compressor wheel is small enough that a machined stock Hitachi back plate and compressor housing can be used; this makes for a good economical upgrade as you only need to purchase the V-trim wheel and machine the stock pieces.
The H-trim is the next size up, and power potential jumps up to 350hp. The H-trim does a little lag to spool-up, but most people won't notice the difference versus the stock turbo. We've seen H-trim compressor upgrades use machined Hitachi pieces or Garrett H-trim back plate + compressor housing.
At the largest end, the 60-1, TS04, T04E "60" all produce around the same amount of horsepower, as compressor wheel sizes are similar. Power potential will start to edge close to 400hp! Due to the sheer size of these compressor wheels, a larger back plate and compressor housing is mandatory. The 60-1 compressor housing is so large, that on a Zenki engine, you might need to grind down part of the compressor housing to clear the lower intake manifold.
It is possible to go larger (compressor wheels), but fitment will be an issue.
Mike
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From: n
Before anything, lets check out your fuel injector capacity.
2 x 550 + 2 x 720 will maybe support about 260hp to 270hp at the wheels.
4 x 720 will maybe support about 300 at the wheels.
I dunno what "T04B" you're looking at, but a V-trim can easily surpass 300 at the wheels.
I'd worry about your fuel injector capacity first before going ***** out with the turbo upgrade.
BTW, are you talking about a compressor upgrade / hybrid?
You mention wastegate porting?
You don't mention a turbo exhaust manifold...
I don't see any problem spooling a 1.15 A / R turbine housing if you keep everything all divided.
-Ted
2 x 550 + 2 x 720 will maybe support about 260hp to 270hp at the wheels.
4 x 720 will maybe support about 300 at the wheels.
I dunno what "T04B" you're looking at, but a V-trim can easily surpass 300 at the wheels.
I'd worry about your fuel injector capacity first before going ***** out with the turbo upgrade.
BTW, are you talking about a compressor upgrade / hybrid?
You mention wastegate porting?
You don't mention a turbo exhaust manifold...
I don't see any problem spooling a 1.15 A / R turbine housing if you keep everything all divided.
-Ted
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From: Lubbock,Tx
Yeah,
I am thinking about getting a second set of 720s for the primaries.
I will probably do the compressor upgrade on my current S4 turbo. I am porting the wastegate as well. It will be a large port as well.
As far as the manifold it is still stock. Would that need to be changed if I just change out the compressor wheel vs. an entirely new turbo?
Mike
I am thinking about getting a second set of 720s for the primaries.
I will probably do the compressor upgrade on my current S4 turbo. I am porting the wastegate as well. It will be a large port as well.
As far as the manifold it is still stock. Would that need to be changed if I just change out the compressor wheel vs. an entirely new turbo?
Mike
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From: Stinson Beach, Ca
well, sounds like you're sticking w/ stock turbo as you're porting out the wastegate
stock manifold leaves you with no choice other than the stock turbine housing
you have a variety of compressor housings and wheels that you can stick on the stock turbine housing. the garrett parts interchange
stock manifold leaves you with no choice other than the stock turbine housing
you have a variety of compressor housings and wheels that you can stick on the stock turbine housing. the garrett parts interchange
Thread Starter
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From: Lubbock,Tx
Thanks for the help.
Yeah, I just don't have the funds for standalones so the best options looks to be to just upgrade the compressor wheel and parts on my stock S4, use the Rtek 2.0 and go from there.
Mike
Yeah, I just don't have the funds for standalones so the best options looks to be to just upgrade the compressor wheel and parts on my stock S4, use the Rtek 2.0 and go from there.
Mike
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