Can I bolt up a series 5 turbo to my series 4 engine?? Do i need a turbo and manifold?? How does the larger wastegate effect performace?? Id like to run consistent 10 PSI with TID, 3" DP, and Full exhaust.

 

Sure...

Yes, if you're looking to do this as a bolt-in proposition without any major custom work.

It doesn't; it's more of a sfety issue than a performance one.&nbsp It minimizes boost creep by being able to bleed more exhaust off the turbine versus the Zenki turbo design.

I seriously doubt it.&nbsp This combination usually results in around 12psi of boost.&nbsp I'd highly recommend an upgrade fuel pump for those mods to keep everything safe.



-Ted

 

Can't use a boost controller to limit my boost to 10 PSI??

 

No, a boost controller CANNOT lower boost! It can only raise it from what would be produced without it. Those mods would see ~12psi like Ted said, so that'll be what you get with the controller turned off or set to "min".
You will have a much better chance of being able to control boost with the S5 turbo/manifold, so I'd defintely do it.

 

yeah youll run 12-13 lbs with those mods. youll need a fuel pump and a FCD to keep your car from blowin up though. 12 psi will make the car quick as hell too. once you drive it with that kind of boost, you wont want to turn it down to 10 psi.

 

Good deal. But can the WG be ported any in an S5 turbo? Will porting and a good wastegate control system keep the boost down?

Brandon

 

yes...mine is ported

 

A "good wastegate control system" will not make a scrap of difference if the wastegate isn't big enough to handle the exhaust flow resulting from your mods. A good wastegate control system can only raise boost and hold it at the level you set. Stop worrying about the controller and sort out the wastegate!

 

yeah it sucks when your wastegate is to small my turbo wouldn't go lower than 1 bar with the stock S4.

 

Hey, im kinda new to the whole turbo deal and i was just wondering, How come a good boost controler (manual or electornic) will NOT keep the boost down, i thought that is what they were their for, to controll the boost? Dont they open up the wastegate when you set them at a certain boost? Or is it that the waste gate just wont breath off enough of the boost even when open? Like i said, im pretty knew to this so bare with me, haha.. thanks guys

 

i think what happens is, you can try to have the boost controller set at a lower psi setting....buuuuut, if your mods are so free flowing that you've gone beyond a certain boost, there's no going back. i guess maybe cause you're forcing so much air thru the turbo, the boost controller can't handle controlling the wastegate. either mechanically or electronically, the force of the air is just gonna bypass what "was" controlled by the BC.

...at least that was my interpretation...could be wrong though

 

actually a boost controler can hold boost at what ever boost you wany be it 0 pounds or 100 pounds that's how they work you can ( with a good controler) set it to 10 pounds and it will hold you have to get a good quality one though no home made ones the reason is the quality ones like turbo XS or Greddy or HKs they use a spring and diaphram to control boost one it sees more boost than it's set at it bleeds the extra boost itself the spring and diaphram con only hold what it's tention is set to though what you can do i did this on my eclipse is get the dual stage manual controler and set the first stage to 10 pounds and then when you get the fuel pump you can set the second to 12 or what ever combo your comfortable with, with this though you HAVE TO have a good boost gauge DO NOT use the stock gauge to judge boost a good autometer will work fine their like 50 dollars just don't use the tubing that comes with them either or you won't get an acurate reading i guess that's all for now

james

 

[SNIP]

Uh, no...



-Ted

 

what do you think reted !
is that true
will a GOOD CONTROLLER lower psi?

 

the main problem is the stock wastegate opening is to small. with a free flowing exhaust and intake system the volume of air flowing through the motor is increase beyond what the wastegate opening was designed for. so the wastegate is completely open and you are still generating 12psi of boost. no boost controller is going to fix this basic problem. now with a larger wastegate opening the boost controller could work as described. but the stock turbo II wastegates just do not flow enough to keep the boost at that level with those type of modifications. I have modified two turbo exhaust housings to use an external HKS wastegate on my race car because with my straight intake and exhaust system even the ported wastegate could not stop the boost creep I had. I run 10 psi on my turbo II race car but I was only able to do this with an external wastegate 50mm or larger.

http://images.realride.com/cgi-bin/i....JPG&img=8&tt=

 

tims you are correct sir, and i was partially wrong you do need to upgrade your wastegate but that's not to bad go external.

 

Lets all be clear what a boost controller actually does. Whether it' a $20 DIY job (surprisingly effective if you do it right) or a megadollar Jap EBC, they all do exactly the same thing. By relieving some of the pressure in the wastegate actuator line, the wastegate sees a lower pressure and so opens a little less. This makes the turbo boost a bit higher. It's only in the control of this process that controllers differ. A controller can only remove some of the pressure in the wastegate actuator line, it can't add it.

 

whats the best diy controller?

 

four tiny bolts hold the small $5 spring on my HKS wastegate. I find it is much easier to pick and tune to a specific boost level and change the spring when a different level is desired(not very often). this is a very simple system with one vacuum line and very little to got wrong. I have had runaway boost twice on my car and once it cost me a new engine.

 

https://www.rx7club.com/forum/showth...threadid=57870

 

Can you bolt a s5 turbo up to a s4 manifold. Ill get rid of the twin scroll ****. I know i should just get the s5 manifold but im broke. will it work for now? Thanks,
Chris

 

No

 

Just port your s4 wg and manifolds....

 

It is relatively easy to port your S4 wastegate, or so I'm told.

 

Yeah but it still won't flow as much as the later ones.

Plus the S5's have a spiffy divided manifold.