Wade

iTrader: (1)

When everyone says "2 row" and "3 row", what exactly does that mean? Does it mean a 2 inch thick core and a 3 inch thick core?

I frequently consider going with a front mount, but the miles of piping discourages me as well as my intuition tells me it will be much harder to keep the car from overheating if I ever get the car on a road course again.

Maybe it's time to use the AC radiator for an air/water system.

Wade

nocab72

SleepR1 - only negative going from 2 row to 3 row, there will probably be less air flow through the 3 row to the radiator than with the 2 row... something to consider if you think going FMIC might cause you any cooling problems, although I don't have any hard numbers or even anyones actual experience to draw from here, just my intuition...(and a few classes in fluid dynamics back in college)

K

vosko

iTrader: (4)

i have a 3 row and no cooling problems

2 and 3 row refers to how thick the intercooler core is. 3row is THICK....

the_glass_man

iTrader: (2)

Get a Supra GReddy 4 row and have someone make custom pipes for it and you will be all set!!!

Wade

iTrader: (1)

vosko,

I understand that the "2 row" and "3 row" is the difference in thickness. I'm just wondering what it actually means? Are their 2 separate rows of charge passages on the "2 row"? Or is it just a misnomer from the japanese translation, and should actually be "2 inch row"? I wonder this every time I see someone use either of the terms.

Wade

RX7Elmo

if you look at an intercooler from the side without the endtanks. you can literally see 2 passages on a 2-row, and 3 passages on a 3-row. THus the reason why they call it X-Row. Of course, a 2 row from one brand might be thicker than say a 3 row from another brand, it just depends on how they setup their passages.

Danny

nocab72

: ya, what he said... # of passages...

jupiter

I got the Greddy twin airlinx.
They fit perfectly and make some really cool sounds.
I can now hear the turbos spool up and the stock BOV sounds like an aftermarket one. I like the sound when the turbo switch over.
You can also hear a nice growl when the airpump is on.
The new foam is a thick sponge type about 1 1/2" thick not a slip on cover. But the dome is silver coated plastic with a metal bolt. I got the blue filters and it matches my engine bay.

fdracer

actually the lower temps aren't due to the extra space. it's cooler because of the larger compressor you have vs. the stock twins. for a given boost pressure a larger compressor will spin more slowly to acheive that psi. your gt3540 is prolly only spinning about 60-70k rpms for 15psi, while the stock twins have to spin about 200k to acheive the same amount of boost. on top of that your single has much less backpressure than the stock twins due to the crappy design of the stock manifold. high revving turbos and lots of backpressure generate a lot of heat, that's why you're so much cooler now.

SleepR1

How do cooler running turbos relate to cooler motor temps? The cooler turbos will make cooler comressed air, and a cooler, denser intake air charge. Cooler running turbos will probably make more horsepowe. The increased hp production will increase heat generation?

Don't forget that my NEW turbos are Japan Spec '99 Type RS/RZ twins which are much more efficient than the old stock twins. The '99 twins have abraded seals providing practically zero tolerance between the blades and the housing.

The blades themselves are 1-mm smaller in overall diamter, 50 mm versus the 51 mm versions of the old stock twins. The smaller diameter blades help in reducing turbo lag through quicker spool-up. The blades also been completely redesigned for much more efficiency. The old twins were designed to make 9.1 psi manifold pressure. The '99 RS/RZ twins are specified to make 10.8 psi manifold pressure.

With regard to the Greddy Airinx, are you referring to how well the intake fits with the Greddy FMIC? I'm disappointed the screens are NOT polished aluminum I guess I can live with blue sponge filters, definitely NOT yellow

KevinK2

For same rwhp, the right single will have less backpressure vs stock and even rz turbos, and will run more efficiently, at a lower boost for same hp, with less waste heat. Also takes less space, allowing better exhausting of engine bay air.

Regarding greddy fmic, haven't seen posts from people that run as hard as u at the track (% of time at wot) regarding coolant temps, esp with twin turbos and keeping AC, and running on hot days. Either vented hood or NPG+ may be needed.

Make sure others do same thing with same set-up u are planning.

Did see one track guy happy with apexi, don't recall ac issue or if twins.

the_glass_man

iTrader: (2)

Some single turbos also use a SS manifold instead of cast like the twins, that just holds heat in the engine bay.
I would advise using oil like Mobil 1 or Royal Purple as well.

Drifter93

Are the two rows and three rows from Greddy both V-spec? And what in the hell do they mean by v-spec?

SleepR1

Mobil One 15W50 is the sh*t!

Wade

iTrader: (1)

Oh, so there are actuall 2 charge rows vs. 3 charge rows. I could never see that from any of the pictures I've seen. Thanks for the info!

Wade

fdracer

all the temps are related to each other. the heat associated w/ the turbos generate a lot of the underhood heat. this heat can heat soak the radiator pretty quickly, causing higher motor temps. this is why na rotaries generally run cooler than the fd w/ it's heat producing twins. a big single will cause cooler temps throughout, iat, water, and the engine bay in general.

SleepR1

So can Rx7 Store guy, Jason Baughman, get me a 3-row Greddy FMIC with a pipe kit that will work for a twin turbo application? Seems to me he could just cannibalize the piping kit from a Greddy 2-row kit? I dunno? Maybe someone can make custom piping? Sounds like a PITA, and I'm an impatient and LAZY old man!

Jason

iTrader: (5)

I will look through my Greddy book tomorrow and see if they have the 3 row for the stock twins. I was under the impression they didnt, but will findout.

Jason

SleepR1

JASON, YOU DA MAN MUST HAVE THICK Greddy FMIC (makes up for other inadequacies )

Need a package deal with an intake of some sort that will fit with the Greddy FMIC kit. I'm leaning toward the Apexi...?

vosko

iTrader: (4)

the piping on the 3row is larger than the 2row... all you would need is ONE PIPE MADE. its not that big of a deal. actually boostn7 is running the 3row on his stock twin turbo car. he just made a pipe. its not a big deal.....

rxrotary2_7

sleep- if you want, i can use a friends car w/ stock twins and my 3row to make you a pipe. just send me a PM. could even weld an flange for a BOV on if you want.

vosko

iTrader: (4)

wait a sec i just remembered. boostn7 actually flipped the outlet pipe around and it worked on the twin turbos. might want to pm him lol

SleepR1

rx7rotary2_7, vosko--I'll wait on Jason's answer on how to fit the Greddy 3-row with the twin turbo application. ReCKlesS has the 3-row FMIC with nonsequential twins, but I'm not sure how he got the 3-row pipe kit to fit his twin turbos?