RB25DET NEO Intercooler Question

[Trini.Madman]

Hey guys, a friend of mine has a RB25DET NEO engine and auto transmission installed in his A31 Cefiro. The car is GREAT on the road. Its completely stock with simply a fuel pump upgrade. This its a Bosch or a AEM.

Anyway, he wants a little more power, nothing drastic, and was wondering what might be the best way to go.

He is unwilling to cut or change his front bumper, and does not want to loose the responsiveness of this engine so a FMIC is pretty much out of the question.

So i advised him to get:

1) FPR
2) #7 NGK Iridiums ( gapped to 0.8mm )
3) HKS Mushroom Filter & attempt to get a decent Cold Air Intake Location for the filter
4) Manual Boost Controller
5) Slightly Larger SMIC

at best he might just raise the boost about 2-3psi more than stock. Not thing amazing.

So I was wondering if i am guiding him along the right path or is it not the best of advise im giving him??

http://www.ebay.com/itm/VW-02-05-JETTA- ... 4c&vxp=mtr

Im hoping we can fit this cooler in the location his stock one is now and it should be able to accommodate the little extra he wants from the engine?

He isnt willing to cut the front bumper and he doesnt want mind blowing power more than he has. Just wants a little more juice!

Opinions? I ask this here because there is absolutely no info on RB25DETs with SMIC. The first upgrade everyone does it a FMIC... So any little thoughts might be helpful.

[Darius]

Save his money and just tell him to install a manual boost controller. The rest isn't going to make any difference if he is just looking for "a little more juice".

[Trini.Madman]

#4 on the list is a manual boost controller.

I think i more interested in knowing if the SMIC will support the 2 extra psi.

[Darius]

Yes, it will the 2 psi and probably another 20 psi on top of that. The SMIC doesn't do anything helpful after it heat soaks anyways. If he's not changing it out, then there's no point in spending the money on anything else. The biggest bang for his buck is going to be a manual boost controller but only take it up to about 12-15 psi.

[Trini.Madman]

WOW! 12-15psi you say! I am not sure if the intercooler will take that. it might get too easily heat soaked. I was just hoping that it would cool the extra 2psi better than the stock SMIC.

i think stock is 5psi under 4500 rpm and 7psi above that.

So i was suggesting lets try 7psi under 4500rpm and 9psi above that and HOPEFULLY the SMIC ( which seems to measure twice the depth of the OEM cooler ) would provide reasonable cooling so the engine doesnt detonate.

If the cooler wont be good enough then i wont advice him to raise the boost atall!

[Darius]

WOW! 12-15psi you say! I am not sure if the intercooler will take that. it might get too easily heat soaked. I was just hoping that it would cool the extra 2psi better than the stock SMIC.

i think stock is 5psi under 4500 rpm and 7psi above that.

So i was suggesting lets try 7psi under 4500rpm and 9psi above that and HOPEFULLY the SMIC ( which seems to measure twice the depth of the OEM cooler ) would provide reasonable cooling so the engine doesnt detonate.

If the cooler wont be good enough then i wont advice him to raise the boost atall!

You are right about the boost stepping up from 5 to 7 psi. From personal experience, I ran the stock SMIC when I was running 12 psi on the stock turbo. I had zero issues with detonation.

In terms of pressure, the intercooler is not going to fail. The rubber couplers might pop off, but the tanks are not going to crack or anything like that. We are only talking 12-15 psi here. If it heat soaks and causes some detonation, the ECU will back off timing automatically.

[Trini.Madman]

OH cool! Thanks! Now that i know u've done 12psi on the stock SMIC, i have no doubts about this aftermarket SMIC.

What about the rest of the things i suggested?

1) FPR
2) #7 NGK Iridiums ( gapped to 0.8mm )
3) HKS Mushroom Filter & attempt to get a decent Cold Air Intake Location for the filter
4) Manual Boost Controller
5) Slightly Larger SMIC

The other stuff on that list? Would that be acceptable? the gap on the plugs etc?

Oh another thing, what octane fuel were u running with the 12psi ?

[Darius]

OH cool! Thanks! Now that i know u've done 12psi on the stock SMIC, i have no doubts about this aftermarket SMIC.

What about the rest of the things i suggested?

1) FPR
2) #7 NGK Iridiums ( gapped to 0.8mm )
3) HKS Mushroom Filter & attempt to get a decent Cold Air Intake Location for the filter
4) Manual Boost Controller
5) Slightly Larger SMIC

The other stuff on that list? Would that be acceptable? the gap on the plugs etc?

Oh another thing, what octane fuel were u running with the 12psi ?

1) No.
2) Just run copper plugs.
3) Might be a decent idea, but not going to do a lot in terms of power.
4) Yes.
5) No.

I was running 93 octane.
I think 0.8mm is the standard gap isn't it? It doesn't matter unless it starts to miss under the higher boost. Then gap the plugs down tighter to help prevent the misfiring.