jrob56

iTrader: (39)

yep youve got the right idea, definitely get the overdrive for the alt if you have extra electronics in the car.

some guys do, some dont, stock you can get away with it, but if you have extra electronics I would absolutely get the alt overdrive which the OP plans on doing.

I would agree with this, seems silly, when a lil overdrive thats easy to put on fixes it right.

Aggie_Ls1

You'll gain close to 10rwhp. I know of shops that charge 300 for a pulley and install. So around $100 for an install.

ULTIMATEORANGESS

iTrader: (4)

youre just raising your idle to get a full charge. theres nothing being band aided.

a tuner told me ASP even recommends having your idle raised. ive never had a problem in over 10 yrs.

zaaronz

iTrader: (13)

I dont think its a band-aid but i think im just gonna order the alt pulley instead and try that 1st. I dont want my idle raised - I love to hear my cam lope If i idled it up a little it seems like i wouldnt hear it as much lol.

ULTIMATEORANGESS

iTrader: (4)

if youre a manual then i dont think you need to have it raised. even so, its not enough to be concerned with.

Starz T/A 17

iTrader: (6)

If you want the car faster then I would do it, but I wouldn't do it just for dyno numbers. A dyno is an arbitrary tool, every one reads differently and can even vary by temp or location. If you try a different dyno you might be over 400 or way under.

Mazzenger

iTrader: (5)

I would do it. You will feel the car rev up to your powerband quicker and with all things being equal, gain 5-7rwhp. This is what I have witnessed.

My6speedZ

iTrader: (18)

If your not running an amp with subwoofers there is really no need for an overdrive on the alternator IMO.

If you want to consider trying to do it yourself there is a tool for putting the crank pulley back on with out risk of stripping the bolt.

http://www.coloradospeed.com/index.p...ducts_id=10976

It actually wouldn't be hard to back one with just some threaded rod and a nice size washer and bolt even.

jrob56

iTrader: (39)

Screw that and ls7 crank bolt is like an inch longer and costs 7 bucks

1BadBlkB1tch

iTrader: (1)

add 1 more degree of timing lol youll break 400rwhp :-) but the pulley will free up some power while improving throttle response

MikeWS6

It will add a few hp. Will you notice it? No. Its not possible to feel a 5-10 hp gain on an engine that is putting down 400 to the wheels Dyno numbers dont mean anything. If you really want to hit 400 try another dyno I guess.

777

iTrader: (21)

But you probably WILL notice that it revs more freely. It will feel faster than 5rwhp.

Take 4.10 gears for example, you'll lose power on the dyno but the car will feel much faster.

I know that's not the same concept but just trying to illustrate that rwhp numbers aren't everything.

99Bluz28

iTrader: (35)

IMO, if you plan on spinning your motor past 6300rpm on a regular basis with the stock alternator then a 25% UD crank pulley is a good idea since it'll keep the the Alt. under 18k even if you spin your motor up to 7k. Or you can install a 3" UD alt pulley to keep the alt. under 18k. If you spin your motor up to 7k with the stock crank pulley and alt/alt pulley you'll already at 18k by 6300 engine rpm, and at 7k your stock alt is spinning at 24500rpm which isn't a good thing for a alt that should never see 18k.
BTW, I figured this with a 98-02 F-body LS1 7.5" crank pulley and stock alt with stock 2.625" alt pulley.

I8UR4RD

iTrader: (16)

for someone like me, who made 393rwhp it was definately appealing. just enough to bump 4. its a 3 jaw an a few turns away from coming off of there. prob take less than an hour to do. powerbond and asp make some, i have the ATI of course...lol.

exodus_gs1

iTrader: (3)

and you lost me, so if you spin over 6300 rpms you need or dont need the alt pulley also?

99Bluz28

iTrader: (35)

If you spin over 6300rpm(engine) then I would use the 25% UD crank pulley or a UD alternator pulley, not both. I don't know where you'd get a 3" alternator pulley but it would slow down the alternator the same amount. Either way I'd also bump up the idle speed to maintain the alternators stock rpm at idle to prevent any future battery charge issues.

exodus_gs1

iTrader: (3)

Ooo ok, so grab a UDP no alternator pulley and be good. Got it but will that over spin the alternator as you stated?

99Bluz28

iTrader: (35)

25% UD crank pulley, and bump idle up = Good to Go!

blk/slvr02ss

iTrader: (21)

Yes thats funny your idle drops when you change over to a 25% UDP i always notice that.

99Bluz28

iTrader: (35)

No, your engine idle rpms don't drop, but the speed of all the accessories do, so that's why you'd want to bump up the engine idle speed so the alternator will maintain it's minimum idle rpms and still work correctly.