reflex92

I've heard many different opinions about this topic. Some people have said that this combo will produce the same amount of power as a 185mm.....then I have heard that it will produce too much boost and be harmful to your engine.

Does anyone run this setup? Can someone that KNOWS give me a break down on this subject and if it is worth it or not? Thanks guys

jturkel

i'm pretty sure you need more fuel, so you'll need a larger fuel pump. I also think that you may exceed the max boost detected, in which case you'll get errors and you'll need to bypass the MAP sensor. if the boost numbers yielded in a stacked setup are greater than that seen in the 185, it will be quite detrimental to the longevity of the supercharger. you could always try it and hope it works out...though i'd buy a used s/c as a backup if that is the case

if money isn't a problem, you could port match the s/c (which will help increase the efficiency), get a higher flowing/larger fuel pump, AND stack them. that's what i'd do if i had time and money (not sure which i have less of at the moment lol/sidenote/vent/procastinating)

reflex92

The reason this even came up was because I was wanting to make the same power as a 185mm but I already have a 178mm and don't really want to go through the hassle of selling it and buying a new one. I've heard some people say that a tuneing shop can "shave" the belt down giving it the same effect as a code 3 but don't shave it as much????? If that makes any sense...lol

I've been scowering the forums for info.

jturkel

thanks for searching in advance!

yes, it makes sense. you make the s/c pulley a little smaller (remember, the stock SC is larger than the Code3 pulley...the smaller Code3 spins faster, spins the s/c faster, you get more boost/power). you keep the same belt.

so you COULD shave down the stock SC pulley to a certain diameter so that your 178+sc pulley equate to the boost of a 185. Not sure how much has to be shaved off, but people have definitely done it....if not here, then definitely on the srt6 forum (same motor as the c32)

and yes, you wouldn't shave it down as much as the code3, or else you'd overboost and have all those problems i mentioned above

Gramma_Benz

Yeah, I'm with Josh, if IIRC, a couple of people have done this before and I think one of them had to replace their fuel pump to get more fuel as it will run lean.

Another SRT-6 owner also did this, but I think since he's at such a high elevation, he wasn't running that much boost anyways. With my 185 before headers, I was running as high as 22lbs of boost and throwing CEL's quiet often. Now with the headers, max boost is about 20 lbs and I never get CEL's anymore.

And even after my last dyno tune, Jerry said my injectors were probably maxed out. Someone mentioned getting a stronger fuel pump, but said that would just increase fuel pressure and isn't really the right way to solve the problem as it may put too much load on the injectors duty cycle??

See this thread for a little more info:

code3 PLUS 178-181-185-pulley

ddtham

When I was shopping for my pulley upgrades, I was faced with the same dilemma of buying lower boost 178mm and combine it with Code 3 if I wished to do so in the future vs. straight to 185. I forgot who has it, but I am almost certain that someone from SRT-6 forum runs the stacked setup.

If you're willing to do so, machine down your sc pulley (I think Code 3 is 69mm vs stock 74mm) and run your car in the dyno and check for AFRs. I am sure you will need a re-tune plus JTurkel's suggestion though. In this case, Jerry from EC is the man as he has been succesful in custom tuning Jake's old car (loungin14) which runs 185+Code 3 and his own old C32 that runs 192 crank pulley.

reflex92

Ya Jerry was actually the one that told me "NOT" to do a code 3 with a 178mm as it would create too much boost and cause a bad outcome. He recommended just going with the 185mm but like I said I would rather just shave the pulley down to maybe 70mm ( a good even point between stock and code 3) and see about the power gains from that?

My question is can any shop "shave" the pulley or does it need to be a specialty shop. Also has anyone else on the forum done this???

newbenz2

Its just a matter of setting it up in a lathe, make sure there is no "Run-out" and use a parting tool to cut the grooves deeper and a turning tool to machine the outer diameter.. If you had a lathe you could do it in your garage... lol
Kevin

gt4awd

Was it 69mm or 65mm? I think 69mm was a custom shaved pulley someone did. Can't remember though... That or we were discussing 65mm being equal to 185mm, LOL...

loungn14

good theory, but your car is not setup for it. You need upgraded fueling.

Boom quickly.....