Arc Twin Entry Intercooler

[BOOSTD]

I have just recieved my ARC intercooler for my R33 GTR. The kit comes with piping and also some solid plugs to fit into the BOV lines. I am not sure if I should be installing after market BOV's or not. Will the Lack of BOV's cause issues?? Or is the a ploy by ARC to increase engine response...from what I can see the twin entry piping will not fit with the BOV return line.

Matt

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Edited May 12, 2006 by BOOSTD

[Beer Baron]

PICS!!! PICS!

[TTT]

$50 for your factory bovs...

Edited May 4, 2006 by GTST

[BOOSTD]

pics up, more to come

[Beer Baron]

looks nice. any pics of the piping? looks second hand, correct?

[BOOSTD]

yep second hand, piping pics i have to get from home..

I do have the instruction manual with it...trying to figure that out atm

Edited May 4, 2006 by BOOSTD

[R31Nismoid]

i wouldnt be removing stock GTR BOV's... best item on the market.

You might have issues.

Some people dont (ie tuned out) some people do...

Luck of the draw it seems on the non BOV issue

[BOOSTD]

hmmn I won't think ARC would do it if it caused problems. I'll get the mrs to translate the instructions. Maybe it states Aftermarket are needed. Doesn't look like it in the diagrams tho.

[TTT]

i wouldnt be removing stock GTR BOV's... best item on the market.

You might have issues.

Some people dont (ie tuned out) some people do...

Luck of the draw it seems on the non BOV issue

SSShhhhhhhhhhhhhhhh shutuuuupppp!!!!

[[WLDCRD]]

you dont need to use that side's (the BOV side) piping. you could still use the standard one and then you wont have to worry about having to change BOV's or blocking it off. Personally, i would keep the stock ones on.

[Craved]

you could just get a flange welded onto the single outlet pipe to fit the 2 BOV's in the std location so you can retain the std return piping.

[BOOSTD]

Not sure if I follow you guys. The ARC cooler kit has twin inlets. The associated piping has to have the BOV return pipe reomoved to fit. (from the two inlet pipes after the AFM's) Also the return BOV plastic pipe behind the intercooler has to be removed as the angle ARC have set the intercooler on is pretty large.(leaning forward)

[BOOSTD]

I just finished installing my ARC intercooler. My initial impession was a massive increase in low to midrange and much sharper throttle response. After further investigation I found the car was running significantly lower boost but no loss in power. I put this down to much less restriction from the intercooler....which is what ARC are all about. At .6 bar in first and second the car spins up all 4 and changes lanes by itself. I haven't loaded it up in any other gear as the tuning is all up to sh$T now. I can't wait for another dyno run so I can over lap the two.

Conclusion <ARC are GODS>

PS this cooler replaced a TRUST item of same thickness

[Roy]

Where are you measuring boost from...if the cooler flowed better you should be makign more boost

[BOOSTD]

boost is measured at the plenum.

boostd is a measurement of restriction, flow is what makes power. The cooler flows the same at less boost

[saliya]

... if you're measuring _after_ the cooler, a lower pressure drop across the cooler due to restriction

should theoretically see a pressure _increase_ at the measurement point (i.e. higher boost) all other

things being equal. So in theory, your newer cooler could be a larger restriction, resulting in lower

displayed boost at the plenum.

All other things, of course, aren't equal. If the cooler is cooling better, you should have denser air

at the measurement point - lower volume - lower boost, all other things being equal (they aren't ).

I'd guess that this is what's happened - did you happen to take any temp readings before/after the change?

ARC have a good rep for a good reason; shame their kit's so expensive.

Regards,

Saliya

[FATGTS-R]

Im confused?????

I understand that a better flowing core will flow more at less boost but you said you didnt touch the boost setting, or thats what I assumed. So from your theory, if you got an even better flowing core than this one boost would drop again without touching the settings? And that if you removed the core and ran a straight pipe boost would lower by itself again?

Transversely, if you fitted a restrictor with a 5mm opening your boost pressure would rise dramatically without adjusting settings according to your reasoning. Is that what your saying?

I thought what Roy thought and that if your new cooler flowed better that pressure would rise on its own and you would have to adjust it lower.

[R31Nismoid]

... if you're measuring _after_ the cooler, a lower pressure drop across the cooler due to restriction

should theoretically see a pressure _increase_ at the measurement point (i.e. higher boost) all other

things being equal. So in theory, your newer cooler could be a larger restriction, resulting in lower

displayed boost at the plenum.

This is exactly what i was thinking. As others have stated, less restriction in the I/C, will results in a higher boost level

[Oblivion]

less restriction means you can put more air through the piping and engine with less work in the turbo, so the more boost is capable. 8psi in a normal I/C flows less air then 8psi in a high flow situation. This is the same with stock turbos and higflow turbos.

[Roy]

boost is measured at the plenum.

boostd is a measurement of restriction, flow is what makes power. The cooler flows the same at less boost

I think we are missing part of the equation. You havent touched your boost settting. So say before they were pumping out 14psi measured at your inlet plenum. With the std cooler you may have had say a 2psi pressure drop. You may have foud that if you measured boost at the turbo outlet before the intercooler then you may have actually been running 16psi...only because of the pressure drop your engien never saw that boost level.

So you install a better flowing intercooler...so now that 16psi your turbos were having to pump out to see 14psi at the plenum will be more likely seen at the plenum. So that would mean more boost at the plenum.

So something isnt right