JerikSS

iTrader: (2)

Are there any real benefits from upgrading a 3" FMIC to 4" FMIC?? How much will it lower temps???

hellbents10

iTrader: (10)

Less pressure drop and more power via lower IAT's.

Vetal

iTrader: (3)

But in reality, does it help? I thought last inch of 4" core would help only slightly, if any

DeltaT

iTrader: (5)

Depends a lot on the quality of airflow through the FMIC, but it will help, probably in the order of a 10-15% temp reduction and similar drop in restriction.

It also is a large heatsink mass, so on short burst of power, you get a payoff that way as well.

Jim

TurboZ28408

iTrader: (18)

quality of core helps a lot. a core with short but many verticle bars would dissipate heat faster plus have less pressure drop than a thicker./longer core

Vetal

iTrader: (3)

Will core like 24x12x3 (most common size I think) restrict power at ~800whp?

Vetal

iTrader: (3)

Is anyone using 3" core on 800+ hp build?

1320

iTrader: (6)

Zombiess probably makes right around there on a good day. It uses a 3 inch core (the ussual) and our next step is to up the cold side pipe area pre itercooler.

I agree with the other guys, that its probably 10-15% in air temp. I get 125 ish with no meth at 15 psi with ambient in 90-100 area. So its probably worth 12-15 degrees....

Does it matter? It does if thats the point that the combustion temp auto ignites.....with no spark. I think theory is that if the combustion temp reaches 660 + or around there (I dont recall forsure) that detonation will occur. So if you at 17 psi and getting 650 combustion temps with a 4 inch core your golden still....but then you swap on a 3 incher and the temps rise to 665.....with the same tune then your wondering why you broke a piston? Or just run 1 less degree of timing?

If you have the room, and the extra 80 or so bucks for the intercooler, and the extra $$ for 4 inch pipe then do it. The 4 icnh pipe might ad another 200 $ to the cold side pipes though.

stevieturbo

Yes....


Mine isnt the typical ebay core, but I use a pair of Pace cores that I used to use on my old twin turbo Rover V8 setup.
I cut them up and welded them together to make a single unit. Far from ideal, but it works ok, and didnt really cost me anything.

kp

iTrader: (34)

I picked up quite a bit going from an eBay 3" to an eBay 4" but you never know, maybe the 3" was plain 'bad' and the 4" was a good one. But the more mass the better IMO, plus more flow doesnt hurt either..

theblur98ss

iTrader: (71)

Was that with the same 3" cold piping or did you up the size of that as well? I'm running the ebay 4" with 3" pipe.

kp

iTrader: (34)

Same exact 3" pipes, I just swapped intercoolers.

EPP

iTrader: (22)

Our intercooler kits also use the 4" intercooler with 3" tubing, it kept my car cool at the LSX Shootout last year on the required drive in True Street and the 1/4 mile runs. Bob

Vetal

iTrader: (3)

EPP, how much $$$ for 4" IC?

Vetal

iTrader: (3)

Could you point me where to look for 4"? I only saw 1 seller on Ebay who has them, but his shipping to Latvia is $280

kp

iTrader: (34)

eBay shipping is a ripoff usually, they sell the part ultra cheap and then charge you a ton to ship it. I would PM Bob at EPP and see what he can do.

Vetal

iTrader: (3)

Don't know, shipping through USA was $67, but to Latvia - $280, that's a bit too much of the difference

DeltaT

iTrader: (5)

Some of that might be import duties, or would you pay that separately?

Jim

Vetal

iTrader: (3)

That was just shipping. Taxes would be on top of that

EPP

iTrader: (22)

Shipping overseas is expensive unless you can use APO. Bob