Trying to plan out the wiring I need to do on the track car;
So I have two SPAL fans installed on the Mishimoto S13 radiator fan shroud:
2x SPAL "Extreme Performance" 12in 1870cfm fans, Model: 30103202.
Now hypothetically have about 3740cfm on tap, way more than the 1100cfm of the 2x 12" mishimoto fans that were installed.
I also purchased two of the SPAL high output fan relay kits, one for each fan, which are rated for the power demands of the AP90/91 fan motors. These kits use 90amp relays. Model: FRH-HO-KIT
Now, after some internet sleuthing, I have read that ONE of these fans can pull up to 100 amps at startup (not sure how this wouldn't trip the 90 amp relay if it's true), and drop to about 40 amps continuous after up to speed.
Now if my simpleton maths is right; if I am running two of these fans, that will require a supply of 200 amps at startup and 80 amps continuous? Or is this not the case?
Now to supplement that, the engine in the s13 is a 2008 VQ335HR. According to google, the factory alternator is rated for 110 amps... So you can see where i'm starting to think I may have an issue. IF I really need to supply 200 amps just to start these fans turning then i'm way over the alternator rating. Unless i'm overthinking something?
I really don't want to pay the 6-700 dollars for a larger amperage alternator for this engine just to run these fans as that's just a ridiculous price and i'm not running some big sound system in the car.
Should I try and wire the fans as separate entities instead? So that they can be powered on and off one at a time. But even then if one's at full speed pulling 40 amps, that only leaves me 70 amps left of the rated alternator output and the second fan is going to want 100 to turn on...
Looking to be educated here.
Fans with SPAL Specs PDF:
https://webstore.spalusa.com/en-us/p...p-12v-pk4.aspx
Supposed amperage requirements I found here, could not find anything directly from SPAL:
https://www.a1electric.com/Merchant2...ode=30103202HO
Relay Kit with Spec PDF:
https://webstore.spalusa.com/en-us/p...bp90-fans.aspx
TLDR: Two SPAL 1870cfm fans supposedly require 100 amps at startup (per fan) and a VQ35HR alternator is only rated for 110 amps, what can I do?