Intercooler

[muzziak]

Hey guys, just needed some feedback. Currently got a Takashi 600x300x68, was thinking of going 100mm core to not restrict flow but it doesn't seem to clear. Thinking a 78mm core at the moment, nothing major just like a JustJap cooler. Was just wondering if the 10mm would make a difference and if it's worth it ? Have a R33 rb25det

Thanks in advance

[R31Nismoid]

What turbo setup?

If stock or even mild (300rwkw or under) don't go 100mm... cause that's crazy. Measure your pre/post cooler temps first and THEN decide if you need to change it.

Likely, you won't.

[muzziak]

I've got the hypergears ATR43-SS2 waiting to be installed. Looking for around 300kW, Im mainly going of Stao's results on his 34 GTT where the 68 restricted flow compared to the 78mm.

[R31Nismoid]

I'd say measure it first and then decide TBH, certainly won't be needing 100mm job though.

Pretty easy to measure both temp and/or pressure drops after a couple runs up the rollers.

[muzziak]

Alright awesome, thanks for the feedback.

[Kinks]

Stao's results are interesting, for some reason the R34 GTT seems very sensitive to any sort of restriction. I know with the standard SMIC, mine was horrible. It doesn't quite make sense why the motor is so sensitive but it seems to be an R34 thing.

Plenty of people seem to have made around 300kW on 68/78mm coolers on the R33.. check dyno results and hypergear threads. Whether their results would have another 20kW with a bigger cooler, who knows.

[iruvyouskyrine]

Standard R34 rb25 neo, Gtr cooler, Hypergear SS2.

315kw on 20psi

[iruvyouskyrine]

GTR cooler cost me $20. And that power figure is on 98.

[scotty nm35]

This is the issue I have when people do back to back tests, they only ever relate to their setup, not any other car, and unless you are measuring temp pre and post cooler you have no idea how much the temps are actually dropping in these situations. I run a cut down 220 x 600 shitty old Jap cooler I ran through the band saw, no dramas here. Would I get a better result with a 100mm core, most likely, but with added lag, plus there is no room to fit it on my car.

If these chinese/Jap coolers actually restricted flow we would know about it, as no-one would get decent results with them. More likely the turbo is out of efficiency and heating the air too much, as that is what I would expect from taking a compressor to it's limits.

[Hadouken]

GTR coolers pull 350+kw time and time again. Some even run 400kw

Standard R34 rb25 neo, Gtr cooler, Hypergear SS2.

315kw on 20psi

[R31Nismoid]

You only have to look at how small the XR6 intercoolers are when they push 400rwkw without a drama.

Definitely no need for something the size of a radiator and thick as a brick

Anyway - the only way - test it.

[boostn0199]

Also depends what fuel if your running on e85 it becomes less of a issue.

[r32-25t]

Ba/BF Xr6 turbos need their coolers changed before 300kw and fgs need it anything over 330

[R31Nismoid]

Yeah, the upgraded ones I mean - aren't that big realistically

[RBrennan25]

Hey guys, just needed some feedback. Currently got a Takashi 600x300x68, was thinking of going 100mm core to not restrict flow but it doesn't seem to clear. Thinking a 78mm core at the moment, nothing major just like a JustJap cooler. Was just wondering if the 10mm would make a difference and if it's worth it ? Have a R33 rb25det

Thanks in advance

I have the 78mm cooler from just jap, and have return flow piping as well although that is a custom job, made 320rwkw at 22psi on my R34. My tuner said that was getting close to the limit for the cooler, temps were starting to climb but nothing outrageous.

Guess it depends what you wanna use it for. 350kw in a street car it would be fine, but if you're planning a lot of track days on 98 maybe it's worth it to go 100mm

[discopotato03]

Do the R34 Neo specific issues disappear if aftermarket or R33 inlet manifolds are used ? I keep wondering if the I think smaller Neo inlet plenum section is working against performance and needing higher boost pressures (and compressor outlet temps) to push beyond 300+ .

It would be interesting to hear from someone that say put a Neo 25T engine in an R33 with the 33 inlet manifold system .

Long shot but 33 inlets could be a cheap upgrade on Neo's pushing beyond 300RWKW .

[scotty nm35]

More likely smaller cams than manifold restrictions I think. Does anyone know the lift on the Neo cams compared to the older RB25?

[chiksluvit]

[steve200b]

My experience with eBay cooler vs precision cooler was similar power but more consistent temps. eBay cooler kept claiming on consecutive runs on the dyno and precision cooler very stable temps

[Ben C34]

Aren't xr6 coolers taller, therefore giving more surface area for the incoming charge. Skylines are pretty much limited to 300 mm tall.