to do list

Ok my current mods in progress are an air intake system(which adds 15 HP), and switching from my stock SC pully to a thrasher 3.4" SC pully. does anyone have any idea how many horses these mods will add to my 240 HP riv?

texasfan010 wrote:

Ok my current mods in progress are an air intake system(which adds 15 HP), and switching from my stock SC pully to a thrasher 3.4" SC pully. does anyone have any idea how many horses these mods will add to my 240 HP riv?

well I would recommend AGAINST getting the thrasher pully.

they only have four sizes, other brands have sizes in 1/10" increments.

I agree. ZZP and INTENSE pulleys are more common, and offer more options. Starting off with a 3.4" pulley is risky anyway. You'll be safer starting with an MPS and gradually moving smaller. See links:

Modding 101
SC Pulley Size

HP can't just be added up like apples. You may get 10 HP with a good air intake, maybe 15 with a very good one, or you may see 20 HP with the 3.4" SC pulley, but you won't necessarily see 35 HP with both. Depends on a lot of other things: gas, engine condition, tune, support mods, weather, etc.

With your planned approach (which should also include 180º t-stat and AL104 plugs), my guess is you will see about 260 HP and a lot of torque increase. You will also be getting knock(KR) in warmer weather, if not right now. Make sure your fuel filter is new.

Isn't the Threasher compatible with Pulley Boys pullies?

I know Intense/ZZP are interchangeable. I think PB and Thrasher are interchangeable as with each other.

what do you think if i took off the stock pullies and replaced them with a 3.2" SC pulley,and a 3.5" tensioner and 3.5" idler pullies, as long as i tuned and scanned them?

texasfan010 wrote:

what do you think if i took off the stock pullies and replaced them with a 3.2" SC pulley,and a 3.5" tensioner and 3.5" idler pullies, as long as i tuned and scanned them?

there is no way in hell you can run a 3.2" SC pulley without some decent mods and not expect a ton of KR

Headers (maybe you could get away with ported manifolds but doubtful)
Rockers or cam
CAI/FWI
plugs 2 ranges colder
180* themostat
tuner

this is bare minimum. and you will probably still be fighting KR, it will just be a few degress instead of double digit KR though.

I'd also doubt that a 3.5 would fit the idler with the engine mount bracket on.

I'm running a 3.6 SC pulley with all the supporting mods in my sig, and still see up to 4 deg of KR.

PLEASE add pertinent car information to your signature. What year is your Riv? No one here wants to search around for other posts to find this info. What supporting mods, if any, have you already done that might make it possible for to reduce SC pulley sizes? Add that info to your sig. You are not asking a simple question here, and we need more info to give you a worthwhile answer. We can only assume you've done no supporting mods, which means you really don't want your SC spinning any faster than it already is. I don't mean to be harsh here, but please give us more details in your signature, so you don't have to type it every time you have a question.

Ok. Start by running a Autolite 104s and a 180* tsat. Get 3in downpipe and then drop to a 3.5 , or a 3.4 if your feeling ballsy( like me) . You'll be more than happy with the results , trust me. if you still want more then theres other things available.

BUT, you really should find a way to scan for KR before dropping pulley sizes. Every car is different, and you could already have significant KR.

haha don't listen to these whippersnappers......... you should be alright running a 3.25 inch pulley .......... also i think you could run diesal fuel in the riv if you remove all your spark plugs and put in spark plug bungs.......









just kidding but listen to AA
https://rivperformance.editboard.com/series-ii-engine-transmission-f4/modding-how-do-i-make-the-car-faster-t23.htm

What is the smallest size supercharger pulley i can use while still using 91 or 92 octane gas(pump gas). im just using your infomation for my knowledge i know my engine is stock so im not going to jump down a bunch of sizes i just want to know.

First you should scan and see if you have any KR on 91 in stock form. Often times they do...

If you are KR free and you can only get 91 you could try a 3.6. If you are KR free you can try a 3.5 but I wouldn't unless you can get 93 octane.

Find somebody local with a scanner who can take a few rides with you... When you change pulley sizes you'll also want to reset fuel trims if their scanner has that ability.

My local resource (until I got my own powertuner) was a local Grand Prix club. You can almost always find somebody near you who belongs to a chapter of CGP or something... and usually one of them will have a tuner... at least you can scan and reset fuel trims with that.

just go 3.5 and put at least 92 octane in there....... you SHOULDNT knock more than 3-4*....... hopefully not anyway

ok what if i put in a 3.6" SC pulley, with a 3.5" tensioner pulley to pick up some of the slack in the OEM SC belt

With a 3.6 SC pulley, there's no need to use a larger tensioner pulley yet. I think at a 3.4 SC pulley the need is there, or nearly so. BTW, to answer your question about the smallest SC pulleys, they are available down to 2.8, maybe 2.6?? Of course you need a buttload of mods in place before you get anywheres close to that. Plus the SC snout needs to be machined first in order for the really small pulleys to fit on, as they'll contact the SC snout body.

And again, I'll ask if you would please add your car info to your signature in your user profile section. Tell us the year and SC or not, at a minimum. Also nice to see current mods in place. It saves us all from asking when you post an inquiry, and will get you better answers to your questions.

98riviera98 wrote:

just go 3.5 and put at least 92 octane in there....... you SHOULDNT knock more than 3-4*....... hopefully not anyway

i will agree with that

palermocorey90 wrote:

98riviera98 wrote:

just go 3.5 and put at least 92 octane in there....... you SHOULDNT knock more than 3-4*....... hopefully not anyway

i will agree with that

I wouldn't. I've scanned two different GTPs completely stock with 3-4* of KR. It does happen. Don't assume unless you want to be buying new pistons. If you are serious, get a scanner at minimum, programmer better.

deekster_caddy wrote:

palermocorey90 wrote:

98riviera98 wrote:

just go 3.5 and put at least 92 octane in there....... you SHOULDNT knock more than 3-4*....... hopefully not anyway

i will agree with that

I wouldn't. I've scanned two different GTPs completely stock with 3-4* of KR. It does happen. Don't assume unless you want to be buying new pistons. If you are serious, get a scanner at minimum, programmer better.

see you need to tell those GTP owners to buy RIVIERA's because i scanned mine with a FWI and tstat and read 0* or KR all the way to 108.................. psh pontiacs

i was wondering how you put on an intense modular pulley after you take off the stock sc pulley with the tool?

texasfan010 wrote:

i was wondering how you put on an intense modular pulley after you take off the stock sc pulley with the tool?

you take the tool and press on the HUB of the module pulley with that sametool

texasfan010 wrote:

i was wondering how you put on an intense modular pulley after you take off the stock sc pulley with the tool?

I borrowed a tool from Dave and he emailed zzp and asked them for the PDF on the removal/installation instructions.

If you buy or borrow the pulley puller, be sure the instruction sheet is included. I don't know if each vendor's tool works exactly the same or not. I do have a PDF of ZZP's inst sheets, more than happy to email it to anyone needing it. The tools can easily be damaged if not used properly per the inst sheet. Like Travis stated, the tool also functions to install the new hub or press-on pulley, whichever way you go.