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Old 10-12-2009, 09:57 AM   #1
pinkertonpunk
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Default APS Intake for STU, 65mm or 70mm?

Hey guys, I plan on doing a few more power mods for next season and need to find out which intake would work better. I am going to be buying an APS intake but I don't know if I should buy the 65mm or 70mm. This is going to be for STU for no boost or wastegate tuning allowed, I am really just looking for more power and need to find out which would be better for spoolup if any or which would be better for more power. I don't plan on really doing anything different to the car after I stop racing it, so that isn't a concern, I just need to find out which would be better for STU. I will be having it tuned again for sure, so that is not a concern either.

The intake will be paired with a turbo inlet, either a Perrin or Samco and I will be buying a ported stock exhaust manifold as well. All I have currently is a turbo back exhaust and a tune.
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Old 10-12-2009, 11:03 AM   #2
mccanixx
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With-in the STU ruleset I don't think there be a huge difference between the 2.

They both lean the car out which allows for additional fuel, which had an impact on my car when it was in STX. I ran the 65mm

If I was purchasing one right now I would get the 70mm......I'm actually looking for a used one.


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Old 10-12-2009, 12:23 PM   #3
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I know the cars with bigger injectors and bigger turbos run into the MAF ceiling quickly, but I don't know if I've seen a stock turbo/stock injector car do it. I'd say if you don't plan on changing either part, the 65 would be fine.
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Old 10-12-2009, 12:29 PM   #4
Dirty25RS
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bigger is better. u want less restriction, less energy loss. as long as it doesn't screw up the MAF or have any weird aerodynamic internal disturbances.

If you really want better spool up replace all the other intake piping as well. You want rigidity for spool up. pipe flexing yields lag.

I've heard you can drop peak boost by 500rpm @ WOT by getting rigid piping.
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Old 10-12-2009, 12:59 PM   #5
pinkertonpunk
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Quote:
Originally Posted by Dirty25RS View Post
bigger is better. u want less restriction, less energy loss. as long as it doesn't screw up the MAF or have any weird aerodynamic internal disturbances.

If you really want better spool up replace all the other intake piping as well. You want rigidity for spool up. pipe flexing yields lag.

I've heard you can drop peak boost by 500rpm @ WOT by getting rigid piping.
I plan on replacing all the piping to the turbo. I can't do hard pipes though since the only one available is the APS which isn't legal. I will be doing an APS intake and then probably the two Perrin hoses from there which will cover everything up to the turbo.

Sounds like 70mm will be the way to go though.
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Old 10-12-2009, 01:12 PM   #6
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Quote:
Originally Posted by pinkertonpunk View Post
I can't do hard pipes though since the only one available is the APS which isn't legal.

Out of curiosity, what makes the APS inlet illegal for STU? I am looking for a similar setup as currently I only have a turboback on the car.
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Old 10-12-2009, 01:14 PM   #7
pinkertonpunk
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Quote:
Originally Posted by boyracer_05 View Post
Out of curiosity, what makes the APS inlet illegal for STU? I am looking for a similar setup as currently I only have a turboback on the car.
I don't know exactly but I think it has something to do with modifying the fuel system in some way which you can't do per the rules.
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Old 10-12-2009, 03:24 PM   #8
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Both of the APS intakes cause a little inconsistency in fueling due to the flow around the MAF. That being said the 65mm should be tuned for and the 70mm 100% requires a re-tune of the MAF curve.

Rob

Last edited by STirish; 10-12-2009 at 08:39 PM.
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Old 10-12-2009, 03:36 PM   #9
pinkertonpunk
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Quote:
Originally Posted by STirish View Post
Both of the APS intakes cause a little inconsistency in fueling due to the flow around the MAF. The being said the 65mm should be tuned for and the 70mm 100% requires a re-tune of the MAF curve.

Rob
Jorge at P&L would be doing the tuning so I am sure that is something he can do. Thanks guys, I think I will be going with the 70mm then since that is what Jorge thought I should do anyway.
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Old 10-12-2009, 04:04 PM   #10
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Colin,

So what did you find out about your engine? Is everything okay?

-Chike
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Old 10-12-2009, 04:36 PM   #11
pinkertonpunk
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Originally Posted by Chiketkd View Post
Colin,

So what did you find out about your engine? Is everything okay?

-Chike
No, I am going to be rebuilding it over the next month or so now that the season is over. I will need at least 2 pistons once the job is done. I am going to start taking the engine out after work tomorrow. Just planning more engine mods for next year.
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Old 10-12-2009, 05:48 PM   #12
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Colin,

I think you will be well served by either. I run the 65mm on my STX car. I would really have to say that either intake will require a MAF rescale.

-JR
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Old 10-12-2009, 05:50 PM   #13
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That's fine, I am sure Jorge knows more about that than I do. I am sure it will be taken care of when I bring it in for a tune.
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Old 10-12-2009, 05:51 PM   #14
wrx wagone
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Quote:
Originally Posted by boyracer_05 View Post
Out of curiosity, what makes the APS inlet illegal for STU? I am looking for a similar setup as currently I only have a turboback on the car.
IIRC, the APS turbo inlet requires modifications to the air system piping. Connections need to be run together into the turbo inlet. SCCA rules do not provide an allowance to modify this piping in order to get an approved modification to work.

A Samco turbo inlet is the only one I'm aware of that doesn't require modifications to the stock piping.
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Old 10-12-2009, 05:57 PM   #15
pinkertonpunk
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Quote:
Originally Posted by wrx wagone View Post
IIRC, the APS turbo inlet requires modifications to the air system piping. Connections need to be run together into the turbo inlet. SCCA rules do not provide an allowance to modify this piping in order to get an approved modification to work.

A Samco turbo inlet is the only one I'm aware of that doesn't require modifications to the stock piping.
So the Perrin isn't legal either then? Good to know!
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Old 10-12-2009, 06:57 PM   #16
wrx wagone
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Quote:
Originally Posted by pinkertonpunk View Post
So the Perrin isn't legal either then? Good to know!
Nope.
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Old 10-13-2009, 09:08 AM   #17
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That is good to know, I thought that only the APS turbo inlet was a no go...I almost bought a Perrin last year, but I guess I will be getting a Samco this offseason.

While we're on the top of intakes, I have a COBB short ram intake that came with the car, but didn't use it last year due to the fact I don't have the COBB air box and being stuck sucking in tons of hot air. But this year I plan to make my own air box and use the COBB. So the real question is, worth it to build the box and use the COBB, or sell it and just get an APS? Thanks (sorry for the minor threadjack ).
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Old 10-13-2009, 09:16 AM   #18
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Quote:
Originally Posted by piknockout View Post
That is good to know, I thought that only the APS turbo inlet was a no go...I almost bought a Perrin last year, but I guess I will be getting a Samco this offseason.

While we're on the top of intakes, I have a COBB short ram intake that came with the car, but didn't use it last year due to the fact I don't have the COBB air box and being stuck sucking in tons of hot air. But this year I plan to make my own air box and use the COBB. So the real question is, worth it to build the box and use the COBB, or sell it and just get an APS? Thanks (sorry for the minor threadjack ).

I know that there is another company that makes a box for the cobb intake. Let me try and find it.
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Old 10-13-2009, 09:22 AM   #19
piknockout
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MODE Racing makes one for about $125 or so. But I have access to cheap aluminum and pretty machinery, so I might do it myself for cheaper. But then again, I don't mind helping out the great Billy Brooks...he actually talked to me at Nationals!

*swoon*
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Old 10-13-2009, 09:29 AM   #20
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Yep thats it or the AVO carbon fiber box. I heard a rumor that AVO made a fiberglass version of their box but can't find it.
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