rentzington

Yesterday was a Dyno Day at a local shop to raise money and collect toys for toys for tots. Good cause so I got off my lazy butt and went to get a dyno run since I haven't done one to see what my tune did.

Got there kinda late so I'm sure I missed some nice runs, got to see some serious power being put down from some mustangs and there was a ctsv with full exhaust done. HPP put on a really nice event for a good cause.



Did fairly good with my run, was hoping for the 425-430 range but what I got was more realistic and respectable.

I've sent off an email to eurocharged to see what can be done about the AFR at high RPM on WOT as it dipped below 12.
Hope leaning that out some can gain a little power



Update:
Heard back from eurocharged said the afr readings are normal and safe and I trust their judgement, also said the run numbers looked good.

Ingenieur

Using 16% for losses
500 HP
450 lb x ft

itzjonjon69

I'm a bit curious what is the WHP -> HP calculations for our car?

Ingenieur

That is complicated and contentious
Rototest is an independent certified third party test & research agency

Here is their c63 test http://rototest-research.eu/popup/pe...p?ChartsID=795
Note they do a steady state test vs ramp run
They run to an rpm and increase load until it bogs
Then they back off a bit and record a 5 sec avg
They do this for 10+ points across the power band
One of the link tabs has the certified graph 'downloads' in a pdf in various units
This is much more accurate

They say losses are 11% for power and 13% for torque
Their dyno is a hub so losses are lower
No wheel mass or slip
My WAG for a ramp dyno is 15 to 17%
Dyno ramp runs are good for changes on the same car but not power rating
Timed runs averaged is the true test

rentzington

In line with everything ive read, about 15-18% loss on a dyno aprx 10% real world

Of course dyno is just a tool to use as an indicator and isnt end all be all, proof would be in the pudding come race time

itzjonjon69

What octane was the dyno on?

rentzington

Same as i always use, top tier rated 93 octane

Probably could have done slghtly better if the engine was good and warmed prior

chrisridebike8

Looks like what I made on the v5 tune with weistec filters on a dynojet. 426/378 at the wheels. Some cars even complained that they dyno'd 10-15 whp lower than normal. I have no point of reference but from what I've read, my numbers were pretty normal.

bhamg

I've seen a variance of 80+whp between pulls on stock C63's across numerous dynos based on what's been posted here. Does that envelope make sense to anyone for comparison purposes? IMO only your same-dyno delta between stock and modded is in any sense a useful number.

rentzington

Yeah it seems to vary greatly but most seem to be In the 420-430 range with just a tune

In an ideal world you'd run on a dyno stock then apply tune then some adaptation runs then a capture run and compare, I would have liked to have done that but I'm impatient and wanted my tune as soon as my unit arrived

johnny--2k

So I'm curious about something, and sorry to go a bit off topic, but it relates to the charcoal deletes.

I had them out, got the V5 tune, and got 2 random CEL for a P0171 that would go away after a day or so. Then, I did the secondary cat delete, code came back, and I emailed Jerry at EC and he told me to put the charcoals back in, as it is known to cause CEL's.

Is this just a luck of the draw thing? Is it really proven to be any better/beneficial? I didn't notice anything "seat of the pants" but it's just one of those pet peeves that I can't seem to find an answer on. I see a lot of people with the deletes, and no reported issues.

Otherwise, those numbers look great! I would love to get mine on a dyno sometime soon as well, but need to ditch those crap stock paper filters first!

rentzington

that's a good question, I haven't had any CEL's since I did mine and I know many others haven't either yet I have read a few people that DID get CEL's even though everything was put back correctly.

Personally I'm not entirely sure removing them gives enough benefit to really notice. I saw one dyno chart that did step by step common mods then a run and it added a couple horsepower and some torque but likely nothing really noticeable.

Only reasons I removed them was
A) why not, easy mod to do and easy to reverse
B) the charcoal doesn't exist in the rest of the world so it should be fine

Wobble64

I got a CEL after charcoal delete, but only because I had connected the air hose to the throttle body poorly and there was a leak. Idiot operator error.... Fixed that, reset the fault and it never came back.


This was 4,500 miles ago.

I am Jeff

The dyno reading for your V5 tune looks good. 420 is a very respectable number. Don't feel bothered by those 450 rwhp dyno readings that you see some people posting up. Dyno numbers can always be manipulated to read higher.

rentzington

Yeah I was hoping for more but after reviewing other runs and hearing back from EC I'm pretty satisfied

I may do something small like row boxes just for that tiny added benefit, but there isn't much else to do unless I go headers

I am Jeff

Have you tried aftermarket air filters? That should free up some airflow for a few extra HP and it's a cheap mod.

rentzington

Yup have afe and no charcoals

I am Jeff

Since you already have the P30 option on your car, you don't need to do the LSD upgrade. I'm sorry to tell you this, but LT's is the next progressive step. The only question that you should ask yourself is, Cats or No Cats?

Cee6three

I'm wondering the same thing...my car has 481 stock hp...what would the whp be?

rentzington

Yeah I know man that cost is a tough pill to swallow. Lately I've been thinking of standing pat and within 1-2yrs upgrade to a 507 or a 2016 model

I am Jeff

18% drivetrain loss is assume variable used by members without the P31 package. Keep in mind that the HP numbers used by MB for the P31 and 507 variants were just used for ratings purposes only. Your rwhp should be anywhere between 410-420.

That thought also came across my mind, but my C also only has 13k miles on it. It just doesn't make sense to upgrade to the same car. I've been religious on my maintenance upkeep, so there's no reason for me to take on more depreciation. The cost of LT's is still cheaper than the hit I will be taking on a new car, plus it'll give me more shyts and giggles for the interim time period.

rentzington

I've seen several threads on how to calculate this but basically as said above its roughly 15-18% loss so factor that In and deduct and its a rough estimate

abcut973

Yes in most cases the CEL following a charcoal delete or/and airbox swap is due to operator's error or actual leak (intake manifold gasket or PCV or MAF failure causing the car to run lean) hence the P0171 code.

OP dyno numbers are good to observe gain vs stock no matter if the max output shown is high or not. That is all that should matter

Ingenieur

The most accurate number for whp is the rototest number
It is a steady state number not a ramp run
Deduct another 3-5% for slip/wheel mass since it is a hub machine

It is for the 451 rating
To adjust for
PP 481/451 = 1.07 x the 451 number
507/451 = 1.12 x the 451 number

Rototest = 401 less 4% = 385 hp for the base car
PP 410 hp
507 431 hp

It will be difficult to compare ramp dyno runs because they are no where near as sccurate

Bazman

That actually works out pretty well in my case. My 507 made 432rwhp stock - within 1hp of your calc. That was with no carbon filters as ex UK car.

Aiming to get to 600hp at motor or 500rw on a rolling dyno