deshelto

I have been looking into the different "Stage I" packages offered by Renntech, Kleemann, Evosport, LET, etc. They all seem fairly similar in that they include 1) a larger crank pulley and 2) an ecu tune. One thing that I notice though, is that some of the vendors offer additional underdrive pulleys. Also, it is not clear to me the size of the "Stage I" pulleys for each vendor. I am particularly intersted in Renntech, Kleemann, and Evosport. If you can give me info on others such as VRP, ASP, etc., that would be appreciated. Can the wisdom of this board help me out by filling in the blanks:


Crank Pulley size = ___________ mm
Underdrive Accessory pulleys included (yes or no)? _________
Estimated HP gain over stock (with tune) = _________ hp


.

BenzoBoi

HYEVON MOTORS

Crank Pulley size = 182 mm
Underdrive Accessory pulleys included (yes or no) NO
Estimated HP gain over stock (with tune) = Good question. I did all my engine mods at once so I'm not sure how each one did...but it does pull like a freight train. no joke. After I got the custom dyno tune, it pulls even harder!

deshelto

Thanks for the reply. Helpful info. Who did your tune?

MB_Forever

Some notes.....

- None of the vendors offer the under-drive pulley system except Evosport and VRP.

- I believe RennTech, Kleemann, and Evosport all use 168 mm pulley.

- ASP and VRP use 178 mm pulley.

- LET offers 172mm and 180 mm pullies.

- Stage 1 from any company in general is expected to give you a 45 to 50 hp gain over stock.

- Evosport and VRP both use Powerchip to tune their cars.

- RennTech, Kleemann, and LET all use in-house tuning.

MJ50

FYI - the new ASP pulley is 180mm now...

Marcus Frost

deshelto,

My writeup on my VRP550 package.

https://mbworld.org/forums/w211-amg/...tml?highlight=

-m

Vader55

Serge at HYEVON MOTORS FTW !!

http://www.bmwvsmbz.com/forum/viewfo...35de4904787ad1

theeddie

what is considered new?

MJ50

they released a new design...

theeddie

does it have a new part number?

when did they do a new design?

MJ50

it's been at least few months...
back then, i contacted k1motorsport for some pulley info and that's what they told me... i didn't ask for the part # since i got the renntech pulley instead...

prodigymb

I have the Evosport STG1 and the crank pulley is 175mm not 168

HYEPWR

Although the exact size of the pulley's available has been gathered and collected ( I believe Jangy measured them all--maybe he can chime in)---what is not so obvious is wheather these different pullies make any differance in HP.

From Finny's adventures it seems clear that there is some artificial "BARRIER" preventing the larger pullies from actually creating more boost. The TCU/ECU and bypass valve are against you. Yes a 182mm pulley should make 15-16psi and a 168mm should make ~12psi-----but the reality seems to be that the bigger pulleys just make more initial peak boost, then fall off to 12psi by 4500-5000rpm because of the bypass situation. I havent tested this---just what Ive gathered.

I mean---the best way to test this is to get a car and put a 168mm pulley on it ---dyno it then put a 180mm pulley on. 2-3 psi should be worth 35-55 EXTRA horsepower. If this imaginary test was done---I bet what we'd see is that both dyno's would show peak boost at 6000rpm to be the same at ~12psi and the cars to have the same power.

Has anyone tried this??

JBFMCAR

Well i saw a Renntech stage 4 that dynoed high 480s rwhp and 520s rwtq then changed the renntech pulley to a ASP 180mm and LET dyno tune and made 531rwhp and 545rwtq and this was on 20 in wheels. On one of my friends cars the same day an 04 e55 with just ASP 180mm and LET dynotune he put down 487rwhp and 525rwtq on 20x11 HRE rear wheels with 295-25-20 tires. Jerry and Wayne from LET said if it was on stock 18s it would have picked up 10+whp & tq on both sides, needless to say LETs tune and ASP 180 pulley do an amazing job together! This car with an Active autowerkes tune we dyno'd before LET flashed there tune on the dyno and it would only dyno 450rwhp they picked up 37rwhp just putting there dynotune on the car!
Justin

jangy

I have measured them and we have lots of data that shows the exact same as what you noticed. I am thinking the larger pullies have better grunt down low but actually pull power on top end or even transitions.

Why do so many cars running 168 + ECU tune run just as fast, if not faster than the 180 ones?

Is the extra 4ish psi that i am wasting at the top end causing more heat? I think so.

I'm planning to take my VRP outer piece off and have a smaller one made for easy swap outs. That way, the crank isn't touched and I can swap sizes without removing the radiator.

Last thing, The large pullies may be great for the 1/4 mile track, but I'm looking for street lurking more. Even the 178mm ones need to have a smaller water pump pulley so any bigger and you will still need to make a smaller water pulley. Dunno if that matters.

JBFMCAR

I'm going to have to say that in what i have seen the 180MM make more power over all the power range from the 3 different dynos i saw this weekend on E55s that went to the 180mm's from the smaller 168s and 172s threw the whole rev range big results all right at 500rwhp with stage 1 or well over 500rwhp with stg2+

Justin