I just got off the phone with Jon Winter. He's the guy that has the C32 with the renntech ecu and pulley kit and initially had lower than expected numbers. see this post for those numbers.... https://mbworld.org/forums/showthrea...highlight=dyno

well he is down in Florida now for the Rolex 24hrs and he stopped at Renntech to get some tuning done and the first thing they did was put the car on the dyno and it revealed a 310.3 hp and a 322.3 tq at 76 degrees farenheit. The dyno was done in 3rd gear on 93 octane gas. Renntech said he probably dyno'd too soon after installing the mods and the ecu needed more time to adapt therefore the low numbers initially.

He should be back on Monday after the race with plenty of pictures of the renntech facility which he says is top notch.

so that would be about a 25-30hp increase if his stock hp is the average 280.

MB's with automatic usually have % loss to rear wheels,so the gain is 40-50hp.

the loss is about 20% which equates to about 280 rwhp so the gain is about 25-30hp. how much % loss did you calculate?

Are those numbers at the crank or the wheels?

After running on track in our C32 against a RENNtech C32, I am thinking his car is still low. You can find the write-up on that by searching under my name. We ran just a tick on the clock slower then the RENNtech car and they had the pulleys, ECU and brakes while we only had the pulleys. Knowing our dyno numbers, it seems that 280 at the wheels is too low still when comparing the track times.

I cannot wait to hear from John (please call me if you see this). For those of you that do not know, John raced in a BMW for the Speedvision World Challenge that had our BMW pulley kit (well almost 90% of the BMW's did).

Thanks

Brad

Brad,

those numbers are at the wheel.

OK, that makes much more sense! That is what I had guessed them to be at based upon our track experience.

Thanks

Brad

Jon, I believe we have a mutual friend, drives a yellow C5, I would like to get in touch with you in regards to your dealings with RENNtech and their products. jwade@greateratlantic.net

Jdub,

Do you or Jon Winter have a new Dyno graph for the run done by Renntech. I am curious to see where(what rpm) the horsepower peak is.

As soon as he sends me the pictures I'll host and post. Just got em... the picture quality sucks but blame him not me

dat # is at the crank right?? 310HP and 322 torque? isn't that lower than the stock figureS?

Jerry

what was the power loss percentage from crank to the wheels? 15 or 20% ?

Renntech claims 21% loss for automatic MB's.

Those numbers are at the rear wheels.