*** VRP Stage 2 Heads Buildup ***
01-31-2008, 05:20 PM
#276
MBWorld Fanatic!
Of course it would. That would not be a surprise at all. I guaranty you that if you can log knock sensors i will show you that your call is knocking like crazy being that lean. As i mentioned the leaner you make the car depending on the octane you have the more power you will make. There is a famous phrase "leaner is meaner." BUT, you are running the risk of putting a hole in one of your pistons. The difference betwenn 11.7:1 to 12.2:1 is maybe 20whp at the boost level for a 55compressor engine. To me its not worth it.
If you have tuned your car for 12.2:1, what happens if you get a bad tank of gas? Do you think all pump gas are the same? There have been many tests done that showed pump gas from even same stations on different days can show different octane rating. At 12.2 you are already at the edge, and you will destroy your engine.
A good and reliable tuner will never tune your car that lean on pump gas. On leaded 118 octane on high boost applications we will lean it to 12.3-12.5 but those are for very short runs. If you do a 2nd-5th gear pull on the highway being that lean, you will not be happy.
If you have tuned your car for 12.2:1, what happens if you get a bad tank of gas? Do you think all pump gas are the same? There have been many tests done that showed pump gas from even same stations on different days can show different octane rating. At 12.2 you are already at the edge, and you will destroy your engine.
A good and reliable tuner will never tune your car that lean on pump gas. On leaded 118 octane on high boost applications we will lean it to 12.3-12.5 but those are for very short runs. If you do a 2nd-5th gear pull on the highway being that lean, you will not be happy.
01-31-2008, 05:48 PM
#277
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CLS55, BMW 540, SUPRA
Usually a dyno pull is done with safe AFR and very safe timing to get a baseline knock reading then as you increase boost/timing/afr you refer to your original knock sensor to see if you are getting spikes in the voltage more than you should.
The following is a log of knock sensor 1 & 2 and pull from 4000rpm to 7500rpm. Top graph is the RPM, the middle graph is knock #1 and lower graph is knock#3. Where i have selected with the vertical black bar is shown in the top right corner and their corresponding values. You can see that at ~4000rpm when the pull starts knock sensors 1&2 are reading close to 0 volts, but as RPM increases the voltage increases.
That is expected cause there is increased noise. But notice how knock #1 has a nice gradual increase and no specific part that is significantly higher than the where the natural upcurve of the tracing is. But look at knock #2, at 6641RPM there is a spike of voltage to 2.9volts when knock #1 is only 1.42 volts. In my engine knock sensor #1 is between cylinder 2&3 and knock sensor #2 is between cylinder 5&6. This shows a possible detonation/knock in those cylinders. This is how knock sensing should be done. Anything else is just black magic
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02-01-2008, 02:35 AM
#278
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2003 E55 AMG
Just wanted to let you know..
Both the stock cams and the VRP cams are over 0.5" of VALVE lift... The VRP ALOT more..
When I quoted the low 11s, it was lift as measured at the CAM. I was not talking about overall lift (taking into consideration rocker ratio). Just wanted to clarify that point.
Both the stock cams and the VRP cams are over 0.5" of VALVE lift... The VRP ALOT more..
When I quoted the low 11s, it was lift as measured at the CAM. I was not talking about overall lift (taking into consideration rocker ratio). Just wanted to clarify that point.
02-01-2008, 09:03 AM
#279
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CLS55, BMW 540, SUPRA
Just wanted to let you know..
Both the stock cams and the VRP cams are over 0.5" of VALVE lift... The VRP ALOT more..
When I quoted the low 11s, it was lift as measured at the CAM. I was not talking about overall lift (taking into consideration rocker ratio). Just wanted to clarify that point.
Both the stock cams and the VRP cams are over 0.5" of VALVE lift... The VRP ALOT more..
When I quoted the low 11s, it was lift as measured at the CAM. I was not talking about overall lift (taking into consideration rocker ratio). Just wanted to clarify that point.
Anybody can simply buy a cam and give it to a machine shop and will shortly find out what the lift/duration etc of the cam. Even if i knew the specs, do you guys actually think that business will be lost because now I am going to go find my own core supplier and have them grind a set of cams? That probably will cost more than what you guys are already selling.
02-01-2008, 06:01 PM
#280
MBWorld Fanatic!
When there would be some news on HEADS or when will we know if they work or NOT and how much POWER do they make ???
I need to prepare my car for coming season !!!
I need to prepare my car for coming season !!!
02-01-2008, 10:06 PM
#281
Out Of Control!!
02-02-2008, 05:47 PM
#283
MBWorld Fanatic!
Correct ME if I worng but are YOU going to wait till they develop ECU with HAVOCs car and then try to use his one and then dyno your car ???
Good lord that its winter and you cant drive you car to full potentials, so you can rest a bit and wait...it hard to be a pioneer...
Good lord that its winter and you cant drive you car to full potentials, so you can rest a bit and wait...it hard to be a pioneer...
02-06-2008, 06:20 PM
#284
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2003 E55 & 2014 GL550
Update: Gonna get the car down to Vadim in LA and have him custom tune it on the dyno and see what he comes up with.
Really think that when fuel is leaned out, she's gonna jam.
Shipping her down in a week or so.
Really think that when fuel is leaned out, she's gonna jam.
Shipping her down in a week or so.
02-09-2008, 10:45 AM
#289
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2015 S212
Correct ME if I worng but are YOU going to wait till they develop ECU with Jackpro's car and then try to use his one and then dyno your car ???
Good lord that its winter and you cant drive you car to full potentials, so you can rest a bit and wait...it hard to be a pioneer...
Good lord that its winter and you cant drive you car to full potentials, so you can rest a bit and wait...it hard to be a pioneer...
I don't think they need to wait. Vadim and Powerchip have a pretty good grip on what the levers are, they just need to actually do a custom tune for Havoc. It shouldn't take that long at all, since now they know where the parameters of interest are located and how to manipulate them.
Being a Pioneer does take patience, but the breakthroughs along the way can be priceless
