Are there any more upgrades that can be done to hit 450 RWHP ? cams..
RENNTech SLK 55 - SLK55R's car
Thread Starter
MBWorld Fanatic!
Joined: Aug 2006
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From: Fremont, Ca
EVOTECH Mercedes AMG
RENNTech SLK 55 - SLK55R's car
Here you go guys,
Renntech SC and headers. Videos of Jesse's car can be found on our gallery.
www.euroelitesonline.com
Renntech SC and headers. Videos of Jesse's car can be found on our gallery.
www.euroelitesonline.com
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Joined: Jun 2004
Posts: 770
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From: Silicon Valley, CA
'93 RX-7, SLK55
Jesse - good numbers!
Your car is putting down stock Viper GTS numbers & weighs in about the same (~3,400 lbs). You also have lower drag & a 7 Spd tranny which also help acceleration. Good numbers Jesse. 
-Matt
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Joined: Apr 2005
Posts: 1,990
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From: Bay Area
'10 Porsche Turbo PDK, 500e, GL450
happy with the results
Thanks matt, I"m pretty happy with the numbers as is.
This is just a breakdown for everyone from premod dynos to current and also what Renntech had up on their site. (Also remember that these are on different days but the temp and humidity weren't off by that much. )
MY premod dyno is at :
https://mbworld.org/forums/showthrea...highlight=dyno
It showed 299.78 max HP and 307.14 max torque.
The stock SLK55 crank numbers are supposed to be 355hp/376torque
Using this I'm calculating the correction factor from crank to wheels for both HP and torque.
355 x X = 299.87, X = 299.87/355, X = 0.845 HP correction factor
376 x Y = 307.14, Y = 307.14/376, Y = 0.817 Torque correction factor
Post Mod dyno numbers at wheel
X1 x 0.845 = 399.43, X1 = 399.43/0.845, X1 = 472.67 HP at crank
Y1 x 0.817 = 427.79, Y1 = 427.79/0.817, Y1 = 523.61 Torque at crank
At the wheels I gained 99.56 HP and 120.65 Torque
At the crank I gained 117.67 HP and 147.61 Torque
Renntech numbers are shown at the crank :
http://www.renntechmercedes.com/PDF/Models/R171_SLK.pdf
They say that with the mods I've done I should show a 118 HP gain and 107 torque gain.
I think this puts to rest Renntech posting inflated numbers.
This is just a breakdown for everyone from premod dynos to current and also what Renntech had up on their site. (Also remember that these are on different days but the temp and humidity weren't off by that much. )
MY premod dyno is at :
https://mbworld.org/forums/showthrea...highlight=dyno
It showed 299.78 max HP and 307.14 max torque.
The stock SLK55 crank numbers are supposed to be 355hp/376torque
Using this I'm calculating the correction factor from crank to wheels for both HP and torque.
355 x X = 299.87, X = 299.87/355, X = 0.845 HP correction factor
376 x Y = 307.14, Y = 307.14/376, Y = 0.817 Torque correction factor
Post Mod dyno numbers at wheel
X1 x 0.845 = 399.43, X1 = 399.43/0.845, X1 = 472.67 HP at crank
Y1 x 0.817 = 427.79, Y1 = 427.79/0.817, Y1 = 523.61 Torque at crank
At the wheels I gained 99.56 HP and 120.65 Torque
At the crank I gained 117.67 HP and 147.61 Torque
Renntech numbers are shown at the crank :
http://www.renntechmercedes.com/PDF/Models/R171_SLK.pdf
They say that with the mods I've done I should show a 118 HP gain and 107 torque gain.
I think this puts to rest Renntech posting inflated numbers.
Last edited by SLK55R; Nov 10, 2006 at 04:44 PM.
MBWorld Fanatic!
Joined: Apr 2005
Posts: 1,990
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From: Bay Area
'10 Porsche Turbo PDK, 500e, GL450
450rwhp
For Renntech ... I'm not sure. I'm positive that I could easily squeeze another 20 from removal of precats but I'm not sure what else would help. I've asked about TB but they said that since this is a low boost pressure system ... they don't feel that the TB would help a lot. Cams would be another option but they won't give another 30 RWHP.
I think for me the next steps won't be in additional HP. I'm going to start lightening this car. Personally I think this is one of the few Benz's that reducing weight should help significantly.
I think for me the next steps won't be in additional HP. I'm going to start lightening this car. Personally I think this is one of the few Benz's that reducing weight should help significantly.
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Out Of Control!
Joined: Nov 2001
Posts: 21,014
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From: CA, NV, CO
Awsome numbers Jesse! Just curious how HP the high boost kit produces and what makes it different? Also you can always run on race gas which adds another 15hp. At least that's what i got. Cams helps from mid to high rpm.
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MBWorld Fanatic!
Joined: Apr 2005
Posts: 1,990
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From: Bay Area
'10 Porsche Turbo PDK, 500e, GL450
high boost
I'm sure Renntech could make a high boost kit for the SLK55 but there would be a lot of engine modifications. Also I'm not sure the 7G tranny can handle a high boost application.
race gas ... yes its something that I add to my car already ... I'm trying to always have at least a 93 octane mix. RIght now though the ECU is programmed for 91 octane. I've already requested a 91. 95. 100 ecu program so that I can switch out when I want to.
race gas ... yes its something that I add to my car already ... I'm trying to always have at least a 93 octane mix. RIght now though the ECU is programmed for 91 octane. I've already requested a 91. 95. 100 ecu program so that I can switch out when I want to.
