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What's the highest power for a tuned 65 amg with stock turbos?
So, finally got on the dyno today to measure the gains if any to be had from tightening up the waste gates.
Max boost I can get was 15.3psi right before redline.
I tried to use the boost controller at a set duty cycle and use a correction feature for higher RPM as boost started to die off. It worked great at lower duty cycle/boost, but once I was shooting for max power, it would boost spike at low rpm past 25psi. I didn't want to push the turbos that hard or make that much torque, so I switched the boost controller to boost by rpm mode. It allows me to set what ever duty cycle i want every 500rpm, so I run lower boost at lower rpm and slowly raise boost every 500rpm, peak at about 4k rpm, and then push the turbos to the max after that. This worked out great to reduce torque at lower rpm. Launching at WOT should be much easier now, and transmission won't be getting as much torque down low, hopefully keep it together longer.
The boost curve looks like almost a larger turbo setup where it needs more rpm to spool up.
Car did the best of 540whp on pump gas, we left the timing map stock to keep it safe and not push the motor. I'm sure I could've got 550-560whp on more timing.
We then drained the tank, and put in 3 gallons of VP MS109 fuel. Boost level stayed the same, fuel map didn't require any changes, and we added a bit of timing.
First pull it put down 580whp.
We added another tiny bit of timing and it put down 599whp. No further changes were made, let it cool for 10 minutes, made 600whp, and then 602whp after 10 more minutes. I ran out of ice, and called it a day. I'm sure there was a little bit more power left there with more timing.
Final numbers were 602WHP/660WTQ (we limited/lowered torque on purpose)
Only mods are speedriven down pipes, custom intakes and ice tank. The rest was just tuning and fuel.
These are dyno dynamics, heartbreaker dyno numbers. A stock 65 amg makes only 450-460whp here, and an E60 M5 only puts down 380whp. Compared to a dynojet, my 602whp would be around 670-675whp, which may be the highest stock turbo/stock intercooler 65 motor.
Here's the dyno graphs from today's tune session:
Are there any other 65 amg cars here that made more than 650whp dynojet or up to 600whp dyno dynamics?
Seem to make a big difference if you tune for Pump Gas or VP MS109. In my opinion it is very difficult if not impossible to get 650WHP on a dynojet on Pump Gas with the stock turbos. But every dyno session is different and there are many variables.
Seem to make a big difference if you tune for Pump Gas or VP MS109. In my opinion it is very difficult if not impossible to get 650WHP on a dynojet on Pump Gas with the stock turbos. But every dyno session is different and there are many variables.
I'm thinking to go to a nearby shop with a dynojet and see what it puts down there. Yes, on ms109, extra timing picked up a lot of power. Around 60whp.
Sorry for the small horrible picture, all I had on me at this time. Have a higher resolution one at the shop.
Happy to say my SL65 is being pushed further, and made 725whp on some good fuel at 23psi, and it screams. This dyno reads lower than dynojet.
Still on a stock TCU.
Hoping to finish my R8 coil pack conversion in the next few weeks, so that I can do some sort of 2 step launch control to help spool the turbo on the launch.
Will do a few dyno pulls on a dynojet later as well to see if it makes 750WHP+ on just fuel, with no meth or nitrious.
Sorry for the small horrible picture, all I had on me at this time. Have a higher resolution one at the shop.
Happy to say my SL65 is being pushed further, and made 725whp on some good fuel at 23psi, and it screams. This dyno reads lower than dynojet.
Still on a stock TCU.
Hoping to finish my R8 coil pack conversion in the next few weeks, so that I can do some sort of 2 step launch control to help spool the turbo on the launch.
Will do a few dyno pulls on a dynojet later as well to see if it makes 750WHP+ on just fuel, with no meth or nitrious.
725rwhp with just intake,exhaust,cooling and high octane tuning? Who's doing the tuning and what fuel?
Great to see some progress! What boost are you running at top RPM? Stock injectors? Do you have some driving video or video from the dyno run? Good luck with further tuning!
Bring that over on my dyno and see if it will break 700whp even.
I will use MS109 next spring and retune the car with much more aggressive timing, should break 800whp.
But stock sl600 turbos without nitrous, I don't see them making anywhere near the power you're claiming they can make. I maxed out sl65 turbos/injectors on ms109, it was low 600whp on a dyno dynamics.
I have an older friend who drives an S65 V12tt. I think it is about a 2006 model. Our dealer told me that it was sent to Hennesey when brand new and was tuned to the highest power level possible. They claimed it was dyno'ed at close to 1000hp (hearsay). I have never seen it dyno numbers but I do know that when it was new, he took it to the Street Rod Nationals in Bristol, TN and finished 3rd place while running with two adults on board and with the AC turned on, using the same street tires he drive with every day. Whatever the HP, it is a very fast car.
I have an older friend who drives an S65 V12tt. I think it is about a 2006 model. Our dealer told me that it was sent to Hennesey when brand new and was tuned to the highest power level possible. They claimed it was dyno'ed at close to 1000hp (hearsay). I have never seen it dyno numbers but I do know that when it was new, he took it to the Street Rod Nationals in Bristol, TN and finished 3rd place while running with two adults on board and with the AC turned on, using the same street tires he drive with every day. Whatever the HP, it is a very fast car.
Irish
I didn't even know Hennessey even work on mercs, honestly i feel like 1000hp with just a tune is a little far fetched, but with just 800hp these cars are keeping up with hypercars, because of that torque, so in the early 2000s these cars was super sleepers.
Yes, here is my Weistec dyno. Its was about a 40k build. 2005 SL65amg Weistec Dyno
Originally Posted by DUDMD
So, finally got on the dyno today to measure the gains if any to be had from tightening up the waste gates.
Max boost I can get was 15.3psi right before redline.
I tried to use the boost controller at a set duty cycle and use a correction feature for higher RPM as boost started to die off. It worked great at lower duty cycle/boost, but once I was shooting for max power, it would boost spike at low rpm past 25psi. I didn't want to push the turbos that hard or make that much torque, so I switched the boost controller to boost by rpm mode. It allows me to set what ever duty cycle i want every 500rpm, so I run lower boost at lower rpm and slowly raise boost every 500rpm, peak at about 4k rpm, and then push the turbos to the max after that. This worked out great to reduce torque at lower rpm. Launching at WOT should be much easier now, and transmission won't be getting as much torque down low, hopefully keep it together longer.
The boost curve looks like almost a larger turbo setup where it needs more rpm to spool up.
Car did the best of 540whp on pump gas, we left the timing map stock to keep it safe and not push the motor. I'm sure I could've got 550-560whp on more timing.
We then drained the tank, and put in 3 gallons of VP MS109 fuel. Boost level stayed the same, fuel map didn't require any changes, and we added a bit of timing.
First pull it put down 580whp.
We added another tiny bit of timing and it put down 599whp. No further changes were made, let it cool for 10 minutes, made 600whp, and then 602whp after 10 more minutes. I ran out of ice, and called it a day. I'm sure there was a little bit more power left there with more timing.
Final numbers were 602WHP/660WTQ (we limited/lowered torque on purpose)
Only mods are speedriven down pipes, custom intakes and ice tank. The rest was just tuning and fuel.
These are dyno dynamics, heartbreaker dyno numbers. A stock 65 amg makes only 450-460whp here, and an E60 M5 only puts down 380whp. Compared to a dynojet, my 602whp would be around 670-675whp, which may be the highest stock turbo/stock intercooler 65 motor.
09-17-2016, 10:28 PM
