Tally TransAm

iTrader: (17)

I have run into a snag on a fan setup for a build I am currently doing and would like some input. Space is at a ridiculous premium (BW S480 retaining AC and all accessories in factory positions) and The original plan was a trimmed set of Flexalite 420's and that ended up not working. I have spent the better part of a week taking measurements and mocking up fans I have and here is what I have come up with.

- Radiator = Griffin 25241-X (standard stand up radiator) with the support cut back to the factory hood latch bracket (really do not want to cut farther and remake the bracket)
- 20"x11" condenser in front of the radiator
- At the moment the washer res is in place in the factory location

Being that I am keeping ac i REALLY want to run a shrouded puller setup as it is much more efficient. I have determined I can run (2) 10" Zirgo's giving me approx 2100 cfm, or (1) Derale or Spal 16" also at approx 2050 cfm. I was also considering running the 16" shrouded puller as the low speed trigger and an additional smaller 10" Spal as a pusher on the condenser at the high speed trigger for AC use. I know those can conflict with either other though.

Either of these would run a full aluminum shroud. The other option is to move the radiator and condenser towards the engine side and run dual 16925 pushers that lots (including myself on my personal car) run, but i think the shrouded pullers would be more efficient especially running AC

Any opinions?

Thanks

HI OFCR

On a radiator that size you would be better to run 2 eleven inch fans? how much room do you have between the radiator and the nearest obstruction?

Sweet_SS

This would be great if you could get it to work.

http://www.summitracing.com/parts/der-16928

Tally TransAm

iTrader: (17)

have about 1.5" on the upper end of the rad for turbo compressor housing clearance (area of the fan cage) and 3" in the center of the rad by the wastegate (in the area the fan motors are)

as a result the fans have to sit on the core and not overlap the tanks. two 11's wonts fit. i measured off the cage sizes of a spal 12" and low profile spal 9" and it should fit on the core. they showed up today so im going to check here shortly

Ping King

iTrader: (20)

I cant comment on the shroud and fan requirements, because my rad isn't done being built yet, but i did have a 24x16x3" core griffin with a 12x24 condensor mounted in front of it. It butted right up to the support bracket and left all kinds of room. (i drilled a hole in that radiator my mistake). I have pictures for you that i can post later.

I'm having a dual pass 26x15x3 radiator built with a single 16" shrouded spal fan that is 2k cfm. I'll have the same 24x12 condensor mounted to the front. I think the thicker core with a proper shroud will cool fine. People run 3000 cfm fans on a tiny stock ls1 core and wonder why its not cooling enough.

I'll let you know how it ends up. I can tell you that having a dual pass style will free up a ton of space for you.

SPRAYED 01

iTrader: (22)

I hate to tell you but no way even 2500cfm is enough with ac. It will over heat if you are in traffic with the ac on. I think the factory fans are around 5k cfm. I have been through the same thing and tried every fan out there. I ended uo finding a 2001 saab 93 turbo at a junk yard. The stock saab fans have to pull through a rad,Condensor, and an IC. They almost look like they are made for that griffin radiator. Very minimal trimming. they are 2 shrouded pullers and i had to run 2 big 40amp relays for them. I now have legit ac again with a big 88mm turbo. Il try and get pics up. Im at work now

aknovaman

iTrader: (7)

http://m.performancetrucks.net/forum...d.php?t=448332

Here are some specs/numbers for fan cfm.

Tally TransAm

iTrader: (17)

id definitely like to see pics. im hoping if the CFM #'s work for procharger guys with stock radiators they will work for this. the 16" Spal they all upgrade to is rated at 2040 cfm and works for the vast majority and others run the additional 9" which i believe is 650 cfm. a friend of mine even has the shitty ATI fan without issues here in florida.

i dont believe those numbers for a minute. the LS1 fans are pretty well known to be in the 4-5k cfm range, not 10500


the setup i planned showed up today so i did some test fitting and the good news is they fit with the incredibly limited space I have. it will be a 12" and 9" Spal puller which combines for right at 2000-2100 cfm. i have enough room to raise them off the radiator about 1/4" and shroud them which will definitely help. these will be on full tilt for the low speed fan. i also got a 10" Spal pusher rated at 750 to mount to the condenser for the high speed and ac trigger. not going to lie, i would definitely more fan on the puller side, but i think it will stay cool. just need to finish the car and check



the compressor housing sits in the area above the 9" fan with the discharge being approx 1/4" - 1/2" away from the fan cage

willizm

iTrader: (10)

I run shrouded flx-420 and although they are not a high cfm dual puller fan setup they keep my coolant temps down.

Tally TransAm

iTrader: (17)

ac?

thats the setup i original planned and tried to trim to fit but i would have had to really cut them more than i wanted to

11SECSS

iTrader: (199)

I'm going to try this setup on mine:

I did some more trimming on the bottom.

willizm

iTrader: (10)

I don't have the condensor hooked up but don't think it's going to cause soaring coolant temps. The trimming isn't too bad.

SPRAYED 01

iTrader: (22)

Willizm, you would be surprised how much actually running the ac does. Good luck with your setup. Some people are happy with ac for about 20mins then needed to shut it off.

willizm

iTrader: (10)

I dunno if i'm even going to hook up the condensor. For the amount of times I'd actually run AC it probably wouldn't be worth the hassle. I had no issues last summer though with the setup.

FlashWS6

iTrader: (18)

I got a pair of Junk flex-a- lite fans that may have been defective,I have since decided to try this fan setup in the thread below.

https://ls1tech.com/forums/forced-in...er-fans-2.html

Tally TransAm

iTrader: (17)

not talking trimming to fit the radiator, talking to clear the turbo.

i went as far as doing the trimming you did to fit the radiator, and on the pass side i had to remove the "flexalite" plate, all the ribs on the cross support above it, the large support at the 2 oclock position, and taking some metal off the motor itself before i said ok, time for plan B. personally though i dont think youll have an ac issue. that setup is almost as proven as the derale 16925 pusher setup, thats why it was plan A

willizm

iTrader: (10)

Gotcha, yeah the setup is tight but it doesn't touch the crossover or turbo in my car, the radiator is stood up maybe a little further than most other setups and the consequence to that was having to pin the hood, remove the stock latch and also make some brackets for the headlights to get them to fit.

Patsy57

iTrader: (37)

Any update on this?

Tally TransAm

iTrader: (17)

had enough fan (used the spal's mentioned above), but ended up having to swap the radiator to a 55241

ended up looking like this






i talk to the person who's car it is pretty often and other than some fan relays going out there havent been temp issues