83mm or 80mm Pulley Clutched.
07-07-2018, 02:34 PM
#1
Super Member
Thread Starter
83mm or 80mm Pulley Clutched.
I live in California, if i go headers they will be shorties and wont be done till down the line. Smog restrictions and visual inspections plus the headache paying someone if you find someone to pass smog is a complete and utter headache.
Now i got the headers out of the way because that always comes up, im kinda torn not sure wether i should do a 83mm pulley or 80. Dont want to go too crazy on pulley size because a 77 will require way more then the cooling mods i have plus injectors to be safe. My goal is to be about 460-470rwhp as we speak im about 434rwhp. For people who are using a phone i have a Superflow IC Pump and VRP Secondary H/E. I havent seen any threads on 80mm pullies and peoples experience with it.
Now i got the headers out of the way because that always comes up, im kinda torn not sure wether i should do a 83mm pulley or 80. Dont want to go too crazy on pulley size because a 77 will require way more then the cooling mods i have plus injectors to be safe. My goal is to be about 460-470rwhp as we speak im about 434rwhp. For people who are using a phone i have a Superflow IC Pump and VRP Secondary H/E. I havent seen any threads on 80mm pullies and peoples experience with it.
07-07-2018, 05:33 PM
#2
MBWorld Fanatic!
It's a new pulley size that only VRP makes so not many would have tried it yet and the tuning may not be dialled in 100% for it either. Cooling for 77mm is pretty much just heat exchanger and pump so you don't have to rule it out for a street driven car at least. I find the 83 insane enough but 77 would definitely get your goal.
07-07-2018, 08:13 PM
#5
Super Member
Thread Starter
07-07-2018, 08:29 PM
#6
A TB will not make more HP than a smaller pulley.
As for HP gains with an 82mm TB you would be looking at 20-30HP as seems to be the consensus on the forum.
As for power here is a nice little formula for hp gain per mm of pulley size lost. https://mbworld.org/forums/w211-amg/...ize-boost.html
As for HP gains with an 82mm TB you would be looking at 20-30HP as seems to be the consensus on the forum.
As for power here is a nice little formula for hp gain per mm of pulley size lost. https://mbworld.org/forums/w211-amg/...ize-boost.html
07-07-2018, 08:54 PM
#7
Super Member
Thread Starter
A TB will not make more HP than a smaller pulley.
As for HP gains with an 82mm TB you would be looking at 20-30HP as seems to be the consensus on the forum.
As for power here is a nice little formula for hp gain per mm of pulley size lost. https://mbworld.org/forums/w211-amg/...ize-boost.html
As for HP gains with an 82mm TB you would be looking at 20-30HP as seems to be the consensus on the forum.
As for power here is a nice little formula for hp gain per mm of pulley size lost. https://mbworld.org/forums/w211-amg/...ize-boost.html
Trending Topics
07-08-2018, 01:33 AM
#8
MBWorld Fanatic!
I would recommend read all the posts about people having trouble with throttle body upgrades. You really spin the wheel of fortune on that one and some people can never get their car back to normal even going back to a stock 74mm TB. Some people it works perfectly but a back to back dyno with other mods showed only a 10whp difference 82mm vs stock TB, worth the risk?
By shorty headers, hopefully you mean mid length? Shorties (keep stock downpipes with huge restriction + cats) are a wasted modification on these engines.
By shorty headers, hopefully you mean mid length? Shorties (keep stock downpipes with huge restriction + cats) are a wasted modification on these engines.
07-08-2018, 01:37 AM
#9
Super Member
Thread Starter
I would recommend read all the posts about people having trouble with throttle body upgrades. You really spin the wheel of fortune on that one and some people can never get their car back to normal even going back to a stock 74mm TB. Some people it works perfectly but a back to back dyno with other mods showed only a 10whp difference 82mm vs stock TB, worth the risk?
By shorty headers, hopefully you mean mid length? Shorties (keep stock downpipes with huge restriction + cats) are a wasted modification on these engines.
By shorty headers, hopefully you mean mid length? Shorties (keep stock downpipes with huge restriction + cats) are a wasted modification on these engines.
07-08-2018, 01:51 AM
#10
MBWorld Fanatic!
Yep I would stay stock exhaust if I were you unless you later on consider mid or full length headers with cats. Shorties will not yield much at all except possibly unreliability and annoying temperature related sounds. The only major restriction in the whole exhaust is the stock manifold flange and opposing downpipe flange. This is the goal to eliminate. Just get an 83mm and see how you like it. I can't get traction until over 100km/hr in the dry. You can always change it to smaller later. Eurocharged have a very reasonable $35 retune fee and I am sure it is not hard to sell pulleys. Eurocharged or shardul often do a good deal for pulley/tune.
07-08-2018, 01:54 AM
#11
Super Member
Thread Starter
Yep I would stay stock exhaust if I were you unless you later on consider mid or full length headers with cats. Shorties will not yield much at all except possibly unreliability and annoying temperature related sounds. The only major restriction in the whole exhaust is the stock manifold flange and opposing downpipe flange. This is the goal to eliminate. Just get an 83mm and see how you like it. I can't get traction until over 100km/hr in the dry. You can always change it to smaller later. Eurocharged have a very reasonable $35 retune fee and I am sure it is not hard to sell pulleys. Eurocharged or shardul often do a good deal for pulley/tune.
07-08-2018, 02:52 AM
#14
Super Member
You can keep stock plugs with the 77 id say. You could go 77mm plus upgraded heat exchanger or water meth or killer chiller for strong power off the bat and less chance on doubling pullies if your hungry for power. If the car is already a handful to you, 80 or 83 would be good. While its true 80mm is new. I think tuning shouldnt be too hard, different pullies pull different boost at different altitiudes and tthey can predict the amount on the size so not too risky in my opinion but im no expert.
I think shorties can yield 12 wheel but give you header tick which personally i dont like the sound of but woth mid or long its worth the tick for the power gainz. Ill let you know if lsd is worth it shortly. Just gotta get back from holiday to install..
I think shorties can yield 12 wheel but give you header tick which personally i dont like the sound of but woth mid or long its worth the tick for the power gainz. Ill let you know if lsd is worth it shortly. Just gotta get back from holiday to install..
07-10-2018, 11:53 PM
#15
MBWorld Fanatic!
Can I go one step colder while stock? planning install 83mm soon. I already have the plugs.
The following users liked this post:
Das Geld 2 (07-11-2018)
07-19-2018, 01:05 PM
#17
MBWorld Fanatic!
07-19-2018, 01:41 PM
#18
MBWorld Fanatic!
Update super smooth idle and power delivery. Def worth it!
07-19-2018, 03:41 PM
#19
Super Member
an 80mm supercharger pulley will be similar to around a 172mm crank pulley and there are plenty of threads on those if you want to see reviews on that size. there are lots of guys that had 180mm cranks (same as 77mm supercharger) that ran slower times due to timing being cut from heat even if they had longtubes and tons of cooling as an FYI. more pulley isn't always better. if you are just doing short bursts on the street the 180 or 77 will make a ton more torque, but that comes with a cost. Most guys go back to a less aggressive pulley that track as they get more consistent times
07-19-2018, 04:16 PM
#20
Super Member
Thread Starter
an 80mm supercharger pulley will be similar to around a 172mm crank pulley and there are plenty of threads on those if you want to see reviews on that size. there are lots of guys that had 180mm cranks (same as 77mm supercharger) that ran slower times due to timing being cut from heat even if they had longtubes and tons of cooling as an FYI. more pulley isn't always better. if you are just doing short bursts on the street the 180 or 77 will make a ton more torque, but that comes with a cost. Most guys go back to a less aggressive pulley that track as they get more consistent times
07-20-2018, 01:52 AM
#21
MBWorld Fanatic!
an 80mm supercharger pulley will be similar to around a 172mm crank pulley and there are plenty of threads on those if you want to see reviews on that size. there are lots of guys that had 180mm cranks (same as 77mm supercharger) that ran slower times due to timing being cut from heat even if they had longtubes and tons of cooling as an FYI. more pulley isn't always better. if you are just doing short bursts on the street the 180 or 77 will make a ton more torque, but that comes with a cost. Most guys go back to a less aggressive pulley that track as they get more consistent times
07-21-2018, 05:44 PM
#22
MBWorld Fanatic!
07-21-2018, 06:13 PM
#24
MBWorld Fanatic!
07-21-2018, 06:17 PM
#25
Super Member
If you take off your plastic intake when looking sth the engine fro the front on the right side youll see a metal braided line going inti the furl rail, make sure thats tight with a spanner. Mine was loose once and leaked petrol onto the engine cover, it was so strange id never heard petrol crackle before as it evaporated on hot engine...it didnt ignite thank the lordie...
