VRP825 SL600 DYNO, AFR, BOOST

soulsearcher · 10-28-2009, 01:02 AM

So I put 100 octane and went back to test per Marcins request. He wanted wideband, boost and torque (previous had none of that) so he can solve why this car did not make the expected 630-660 rwhp and crack 185-187 in the mile.
Notice the boost problem (Should be 23 )! Short test on Star came up clean.
NOTE: Fuel pressure feed is actaully boost.

HOW DO I INSERT PICS DIRECTLY INTO THE BODY WITHOUT LINKS

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Thericker · 10-29-2009, 03:20 AM

Quote:

Originally Posted by soulsearcher

So I put 100 octane and went back to test per Marcins request. He wanted wideband, boost and torque (previous had none of that) so he can solve why this car did not make the expected 630-660 rwhp and crack 185-187 in the mile.
Notice the boost problem (Should be 23 )! Short test on Star came up clean.
NOTE: Fuel pressure feed is actaully boost.

HOW DO I INSERT PICS DIRECTLY INTO THE BODY WITHOUT LINKS

I can't view your files?? what #s did you lay down w/100 oct? Is there indeed a boost leak?

Good Luck w/issues you're in great hands, Marcin is wicked smart!

soulsearcher · 10-29-2009, 04:06 PM

Thericker,

I really wanted feedback on the graphs. How do I insert the actaul pic into the body? Anyone?

No leaks found. Testing Map and wastegate adjustment today. This car has always been 30-40 rwhp low, even with Renntech so maybe the wastegates r an issue or the Map is reading boost higher than actual. Also checking for Vac. leaks. I bet it is the Wastegate

Thericker · 10-29-2009, 04:41 PM

Quote:

Originally Posted by soulsearcher

Thericker,

I really wanted feedback on the graphs. How do I insert the actaul pic into the body? Anyone?

No leaks found. Testing Map and wastegate adjustment today. This car has always been 30-40 rwhp low, even with Renntech so maybe the wastegates r an issue or the Map is reading boost higher than actual. Also checking for Vac. leaks. I bet it is the Wastegate

Try loading graphs to Photobucket.com then link them here...PM me if more help is needed

blazeone · 10-29-2009, 07:59 PM

I could see the charts, you can open them up in Photoshop or MS paint. Posted below. I would send them to the tuner and have them check it out. You are short boost, could be the ECU flash or hardware. I'd try the easy route first and have the tuner re-flash your ECU and then dyno it again.

You're only seeing a max of 18.8 psi. That is an issue and I would think that tune should pull 20-22psi? The drop off could be caused by high IAT's or fueling. It shows way rich 10:1 at max boost and then leans from there. Your hp line does not dive at the upper rpm range, so to me it looks like your max boost is too low and holding down your power output. Are you running mufflers?

soulsearcher · 10-29-2009, 10:58 PM

Quote:

Originally Posted by blazeone

I could see the charts, you can open them up in Photoshop or MS paint. Posted below. I would send them to the tuner and have them check it out. You are short boost, could be the ECU flash or hardware. I'd try the easy route first and have the tuner re-flash your ECU and then dyno it again.

You're only seeing a max of 18.8 psi. That is an issue and I would think that tune should pull 20-22psi? The drop off could be caused by high IAT's or fueling. It shows way rich 10:1 at max boost and then leans from there. Your hp line does not dive at the upper rpm range, so to me it looks like your max boost is too low and holding down your power output. Are you running mufflers?

No mufflers, custom x exht.
Its not a fueling nor an IAT issue.
tune was set to be rich on high boost to be on the safe side. the tune has not been well tested on the 600 so 2 rich is better than 2 lean at this point.
here is the other 2 graphs (550 rwhp) in jpeg.

blazeone · 10-30-2009, 12:00 AM

I have heard that removing the mufflers can cause a loss of 1.5 - 2psi of boost. This is second hand info so consult an expert. I do know that adding headers to a supercharged car will cause a drop in boost. They get power from the headers but lose some power from the boost loss. They fix this by going to a smaller pulley though.

NEMES1S · 10-30-2009, 01:11 AM

has anyone ran a dyno before and after cutting out the mufflers on an sl600 or sl65?

soulsearcher · 10-30-2009, 08:00 PM

Quote:

Originally Posted by NEMES1S

has anyone ran a dyno before and after cutting out the mufflers on an sl600 or sl65?

I did with a Renntech tune. No change with or without.

2003 S600 · 11-05-2009, 08:09 PM

I had my right wastegate rod nut fall off so the wastegate was always open, took 4-5000 rpm to make boost and exhaust was so loud. Found the problem and did double nut so it wont happen again. I have kleemann tune and max boost is 22.3 psi on Dashdaq.

10-29-2009, 04:06 PM	#3
soulsearcher Member Join Date: Jan 2009 Location: Atlanta Posts: 108 Drives: sl600 "extra special", Cayenne S (wifes)	Thericker, I really wanted feedback on the graphs. How do I insert the actaul pic into the body? Anyone? No leaks found. Testing Map and wastegate adjustment today. This car has always been 30-40 rwhp low, even with Renntech so maybe the wastegates r an issue or the Map is reading boost higher than actual. Also checking for Vac. leaks. I bet it is the Wastegate __________________ Sl600 VRP 825 Installed (Should be called VRP670 !!!) Texas Mile 173 official, 177 unofficial w/ 93 octane

10-29-2009, 07:59 PM	#5
blazeone Member Join Date: Aug 2009 Location: Houston, TX Posts: 130 Drives: 2007 SL600	I could see the charts, you can open them up in Photoshop or MS paint. Posted below. I would send them to the tuner and have them check it out. You are short boost, could be the ECU flash or hardware. I'd try the easy route first and have the tuner re-flash your ECU and then dyno it again. You're only seeing a max of 18.8 psi. That is an issue and I would think that tune should pull 20-22psi? The drop off could be caused by high IAT's or fueling. It shows way rich 10:1 at max boost and then leans from there. Your hp line does not dive at the upper rpm range, so to me it looks like your max boost is too low and holding down your power output. Are you running mufflers? __________________ Powered by Eurocharged - LET Last edited by blazeone; 10-29-2009 at 08:18 PM.

10-30-2009, 12:00 AM	#7
blazeone Member Join Date: Aug 2009 Location: Houston, TX Posts: 130 Drives: 2007 SL600	I have heard that removing the mufflers can cause a loss of 1.5 - 2psi of boost. This is second hand info so consult an expert. I do know that adding headers to a supercharged car will cause a drop in boost. They get power from the headers but lose some power from the boost loss. They fix this by going to a smaller pulley though. __________________ Powered by Eurocharged - LET

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10-30-2009, 01:11 AM	#8
NEMES1S Junior Member Join Date: Apr 2009 Posts: 69 Drives: SL600 (soon)	has anyone ran a dyno before and after cutting out the mufflers on an sl600 or sl65?

11-05-2009, 08:09 PM	#10
2003 S600 Member Join Date: Jan 2007 Location: ca Posts: 189 Drives: 2003 s600	I had my right wastegate rod nut fall off so the wastegate was always open, took 4-5000 rpm to make boost and exhaust was so loud. Found the problem and did double nut so it wont happen again. I have kleemann tune and max boost is 22.3 psi on Dashdaq.

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