Dyno Day SSR

[SavMan]

Simon - your numbers are exactly where they should be. Kleemann will quote you 550hp with a pulley, map & filters

 

[simon1966]

Simon - your numbers are exactly where they should be. Kleemann will quote you 550hp with a pulley, map & filters

Cheers Paul

Overall I'm really happy, my car goes like stink when required! I suppose I just see most others with a bit more bhp than mine, that said my torque figure seemed pretty good. I guess quite a few of the other similar modded cars have some exhaust mods too, which may make a bit of difference.

As for Billy's car, well its just a rare beast I reckon!

 

[DSB SL AMG]

Hi Paul, my last dyno run was done in 4th gear....why would you recommend 3rd?

They look good, I would not change them unless you can log your AFR's while on the road. Next time you are in a dyno also ask for IAT's and Boost (if its forced induction) and make sure they are running a 55K in 3rd gear.

 

[SavMan]

Hi Paul, my last dyno run was done in 4th gear....why would you recommend 3rd?

4th gear is a much longer pull than a 3rd gear pull, this creates heat. To much and you end up with fuel dump and timing pulled, the result can be less power and a curve which dips or flattens at higher RPM and rich AFR's

 

[Cyclone1]

4th gear is a much longer pull than a 3rd gear pull, this creates heat. To much and you end up with fuel dump and timing pulled, the result can be less power and a curve which dips or flattens at higher RPM and rich AFR's

It also depends on how the dynamometer is calibrated. Most dyno dynamics are set to record and calculate efficiently at equivalent road speeds up to around 120mph, beyond this then the results can become skewed, normally you will see higher readings with a higher gear, but not sure how much difference it makes on the 55k.

All the graphs seen so far show consistent results for the mods applied and all seem to be running quite rich at the top end (some more than others), hence Charlies quote of them running safe maps, so have scope to eek more power once the maps are tweaked. With the mods these cars have then this should be enough.

Dave's graph seems the odd one out compared to the others and is probably down to being ran by a different dyno operator with a different method of setting up. You would at least expect some correlation between torque / power of Daves with the others, but even though power is comparable, the torque is different.

All good info so keep it coming.

Jules

 

[Cyclone1]

Alps - Billy has changed his belt which I think I will do too. Not expensive either, order from amazon US, its a Gates K080496HD V-belt about $34 plus postage.

You achieved good bhp on your last run at SRR, out of interest what was your torque figure like?

You can also get the belt I did from most motor factors, it is not as small as the Gates belt, but smaller than standard, see comment below from another thread...

The Gates 496HD is a popular choice on the US forums, so must be good. Most comment that the standard belt size is fine as the tensioner if functioning properly, should be able to take up the slack created by adding the smaller pulley.

The standard belt is 1289mm (507.5 in Gates and some other belt manufacturers reference or 50.75 inches), the one you have fitted is 1260mm (Gates 496 x 2.54, or 49.6 inches), I also decided to fit a slightly tighter belt but went for a Continental Contitech 8PK1275 (502 or 50.2 inches). I asked Jerry when he was over and he said that the standard belt should be fine.

Jules.

 

[Billy-cls55]

They look good, I would not change them unless you can log your AFR's while on the road. Next time you are in a dyno also ask for IAT's and Boost (if its forced induction) and make sure they are running a 55K in 3rd gear.

Yes completely agree and Jerry is asking for the IATs now, and seems SSR cant log these, had I known I could have plugged in my laptop as I had it in the boot, plus its pain to get to the rolling road for me due to traffic black spots, and to be honest this visit felt a bit like a sheep dip, so if anyone can recommend another near Kent would be appreciated, going to check with my mate this morning as he recently mention a new dyno cell with 2 x 100 mph fans same dyno manafacturers, as £50 for 20 min session seems to have been a complete waste of time IMHO, and this is not including fuel or time out of work, Only saving grace was meeting up with Simon.

 

[Billy-cls55]

You can also get the belt I did from most motor factors, it is not as small as the Gates belt, but smaller than standard, see comment below from another thread...

The Gates 496HD is a popular choice on the US forums, so must be good. Most comment that the standard belt size is fine as the tensioner if functioning properly, should be able to take up the slack created by adding the smaller pulley.

The standard belt is 1289mm (507.5 in Gates and some other belt manufacturers reference or 50.75 inches), the one you have fitted is 1260mm (Gates 496 x 2.54, or 49.6 inches), I also decided to fit a slightly tighter belt but went for a Continental Contitech 8PK1275 (502 or 50.2 inches). I asked Jerry when he was over and he said that the standard belt should be fine.

Jules.

Hi Jules

The one from the states seems to have been made from an alternative material, as for the standard belt being fine, I have to disagree some of the problems I was having Jerry said "belt Slip" so I changed it and for the sake of a few ££ why not just get the belt that others swear by? I mean my car runs great now, don't lose the power mid range, I know from my own experience standard belt with a smaller pulley is no good, even with a new tensioner. I recommend anyone fitting a smaller pulley fit the recommended USA Green back belt, perhaps the guys that stock the pulleys can get the belts in stock..

 

[Cyclone1]

Hi Jules

The one from the states seems to have been made from an alternative material, as for the standard belt being fine, I have to disagree some of the problems I was having Jerry said "belt Slip" so I changed it and for the sake of a few ££ why not just get the belt that others swear by? I mean my car runs great now, don't lose the power mid range, I know from my own experience standard belt with a smaller pulley is no good, even with a new tensioner. I recommend anyone fitting a smaller pulley fit the recommended USA Green back belt, perhaps the guys that stock the pulleys can get the belts in stock..

I agree, the pulley is dimensionally smaller so needs a smaller belt. I bought a smaller belt to put on with the new pulley but was told the std belt would be fine unless worn. This was at the EC day, I asked Jerry and he said the same, but I fitted it anyway as I am not confident my tensioner is 100%.
Jules

 

[Billy-cls55]

I agree, the pulley is dimensionally smaller so needs a smaller belt. I bought a smaller belt to put on with the new pulley but was told the std belt would be fine unless worn. This was at the EC day, I asked Jerry and he said the same, but I fitted it anyway as I am not confident my tensioner is 100%.
Jules

Hi Mate, I had a new tensioner, new MB belt, I know it was slipping, as you can feel it under hard pulls, I think Jerry would be 1st to admit it’s only his opinion. Problem is persons have a remap and tune and then Jerry spends time trying to resolve problems, these problems are normally with the car and not his mapping, I say to anyone considering tuning, do the basics 1st before you even think about remapping or fitting pulleys, it’s been a learning curve for me, as initially was just going for a dyno run, I am no means an expert, just know what works for me, and some of the things I have done may not be in everyone’s budget, but as a guide.

Do the oil, filter using mobile 1
if your car had over 50k on the clock, I recommend changing the supercharger gaskets and others as per the sticky, while this is off, have your injectors flow tested / balanced, if you are going for a pulley tune, fit the LFR7AIX Ngk plugs, new bosch leads same as the merc ones and a fraction of the price, when your charger is off change the oil with mobile jet oil II, have your gearbox flushed and filter changed, get the EC TCU tune if you can afford it, fit the gates belt previously mentioned if fitting the smaller pulley. If Old / leaking do the cam covers using Merc gaskets, and reseal the breathers. May save you problems later.

I am pretty sure once you do these your car will run better, pull better, and my latest dyno speaks for this even from day 1, I mean what other 55 amgs have this power with just a smaller pulley and EC remap? I am sure others would run the same if the basics where addressed in the 1st place. the map Jerry has done me is probably the best I have had, my car drives like a normally aspirated now, and some of the problems he tried to iron out, are not his doing but my car, no point pumping in more boost if its leaking, no point looking for great power it the drive belt is slipping. I think even Paul said my power was still going right to the red line, so I am going to find a dyno that can log what’s required, and see if Jerry can remote in and sort, anyone that does the above ask Jerry for my map you will not be disappointed.

Supercharger and gearbox is the main put off for most, but I am sure Acid / Olly can do a good price failing that, I know persons in Kent that will do this, they will also fit the EC pulley, and I can help remap your car with the file sent from Jerry. If you can’t afford all this they save and do it in stages, but recommend doing all the service work 1st, most of the other bits are DIY, and I am happy to help a fellow member if they get stuck or need help.

 

[bolide]

I say to anyone considering tuning, do the basics 1st

Agreed 100%

The rolling road is a great tool for finding what's about to break on your car. From my experiences with them about 50% of the time is spent fixing things you should have done before you got there. That's not really a problem, though, unless you don't have the parts you need

When I put my 2002 on the rolling road I took my box full of Weber spares, fuel filters, fuel hose, spare pumps, jubilee clips & etc and everything we needed was there

There is a piece in Octane by Tony Dron this month where he talks about testing classic Le Mans cars on the 2 mile straight at Bruntingthorpe. Cars that perform perfectly elsewhere can unexpectedly overheat or suffer fuel starvation on the long straight. The rolling road is similar in that it pushes the whole car (fuel systems, cooling, etc) to a point you don't normally reach on the road

Nick Froome

 

[Cyclone1]

Billy, I think we are agreeing. Like I said, regardless of what was said on the US Forums, who have much more knowledge than us, I still thought it wise to fit a smaller belt along with the smaller pulley. It was other's with more experience than me that said it wasn't necessary. However, if there is something that is failing mechanically or if the power being called for is high then this can cause belt slip on the standard belt....for sure. My point is I would fit the smaller one anyway as dimensionally it just makes sense.

Not disputing what you say about getting the basics of maintenance right....you are spot on to do this and advise others as well.

I'll get mine on a dyno soon and see what it puts out, but as it is on the original EC map (not been revised since the EC day) then I am guessing nearer 550bhp.

Jules.

 

[Billy-cls55]

Billy, I think we are agreeing. Like I said, regardless of what was said on the US Forums, who have much more knowledge than us, I still thought it wise to fit a smaller belt along with the smaller pulley. It was other's with more experience than me that said it wasn't necessary. However, if there is something that is failing mechanically or if the power being called for is high then this can cause belt slip on the standard belt....for sure. My point is I would fit the smaller one anyway as dimensionally it just makes sense.

Not disputing what you say about getting the basics of maintenance right....you are spot on to do this and advise others as well.

I'll get mine on a dyno soon and see what it puts out, but as it is on the original EC map (not been revised since the EC day) then I am guessing nearer 550bhp.

Jules.

NP Mate, anyway I have found another more local Dyno, and going Sunday, will do the logging myself and see how I get on, will post the results next week.

 

[AndyPCD]

Hi billy if watford isnt too far. I have a guy who would be able to do the car and also log the IAT's while running the car.

 

[Billy-cls55]

Hi billy if watford isnt too far. I have a guy who would be able to do the car and also log the IAT's while running the car.

Thanks Andy, but found a place mate only 30 mins drive from my house, and will do weekends, which for me is important. will see how I get on.

 

[AndyPCD]

Ok cool let me know. My guy does saturdays if needed.

 

[Cyclone1]

Well, have been to SRR this afternoon and the car did ok, keeping it in line with the others on here and the respective mods. Will post the graph later.

Jules

 

[simon1966]

Well, have been to SRR this afternoon and the car did ok, keeping it in line with the others on here and the respective mods. Will post the graph later.

Jules

Jules

Will be interested to see your results. Shame we went a day apart as we could have met up yesterday.

Simon

 

[Billy-cls55]

Well, have been to SRR this afternoon and the car did ok, keeping it in line with the others on here and the respective mods. Will post the graph later.

Jules

Jerry is sorting my map out now, so I am ready for another run on Sun with another rolling road, will be interested to see your results.

 

[Cyclone1]

Jules

Will be interested to see your results. Shame we went a day apart as we could have met up yesterday.

Simon

Yes it was a pity, you guys had already booked yesterday and I had a meeting booked in London for today. I kept quiet as wasn't sure I'd make it there in time but did just. So managed to get straight on (not ideal for heat soak) and did 4 runs with 3-4 mins in between.