Renntech C250!
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Joined: Mar 2011
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From: Richmond, VA
1989 300TE, 1981 380SL, 1990 325I, 2002 Overland, 1976 BMW 2002,
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From: Delaware
2004 Mazda6, 1993 RX7
Hopefully they can do some oem testing prior to mods, like:
1) check pressure drops across intake (w and w/o filter), then across the IC. If they don't have logging capability for this, a Dwyer differential pressure gage (0-100" water column) goes for about $60.
This was critical when I set up my 7 for the track;
a) air filter box had high drop due to snorkel to box connection ... I closed snorkel inlet and created a cold air inlet at bottom of box. No drop with stock filter.
b) Deeply bellowed flex hose from box to turbo inlet had high psi drop. Replaced with larger ID, metal ring reinforced hose. no significant psi drop.
c) IC was apparently designed for a lawn mower. Greddy replacement dropped inlet temps, but had moderate pressure drop, used die grinder and calipers to open up thick, cast inlet bore. removed 1/3 cup of aluminum chips.
2) check intake charge temps, starting from a stop light after heat-soaking, then a start after a long coast dn to cool the IC. (can be done on Dyno)
3) How close is the Mass Air Meter to maxing out?
4) How close is fuel inj system to maxing out ( at least log psi in high pressure rail )
5) turbo back pressure (tricky to do) should be no more than 150% of max boost
6) Identify turbo, find compressor curves (some times just the inlet bore is sufficient, if you have general hp vs mm bore data). How close to limit is turbo?
7) ... whoops, I forgot 7
.
1) check pressure drops across intake (w and w/o filter), then across the IC. If they don't have logging capability for this, a Dwyer differential pressure gage (0-100" water column) goes for about $60.
This was critical when I set up my 7 for the track;
a) air filter box had high drop due to snorkel to box connection ... I closed snorkel inlet and created a cold air inlet at bottom of box. No drop with stock filter.
b) Deeply bellowed flex hose from box to turbo inlet had high psi drop. Replaced with larger ID, metal ring reinforced hose. no significant psi drop.
c) IC was apparently designed for a lawn mower. Greddy replacement dropped inlet temps, but had moderate pressure drop, used die grinder and calipers to open up thick, cast inlet bore. removed 1/3 cup of aluminum chips.
2) check intake charge temps, starting from a stop light after heat-soaking, then a start after a long coast dn to cool the IC. (can be done on Dyno)
3) How close is the Mass Air Meter to maxing out?
4) How close is fuel inj system to maxing out ( at least log psi in high pressure rail )
5) turbo back pressure (tricky to do) should be no more than 150% of max boost
6) Identify turbo, find compressor curves (some times just the inlet bore is sufficient, if you have general hp vs mm bore data). How close to limit is turbo?
7) ... whoops, I forgot 7
.
Last edited by kevink2; Nov 17, 2011 at 10:03 AM.
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From: MI
2024 G63 AMG, 2022 GLE 63S AMG
Pics will be nice also!
Thanks!
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Joined: Sep 2010
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GLK 250
Why take off the c250 badge, I am a c250 owner, I feel proud of my car. I know it not as fancy and expansive compare to 300 and 350, but c250 has better gas mileage...that just my 2 cent
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Joined: Mar 2011
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From: Richmond, VA
1989 300TE, 1981 380SL, 1990 325I, 2002 Overland, 1976 BMW 2002,
Sent it to the one in FL. They've had some issues getting a backup ECU because they haven't tuned a M271EVO yet, so they don't want to screw up the only ECU the car has. I just sent them the registration for the car (I officially bought the thing an hour ago) so they can get THE ONLY FRIGGIN SPARE ECU in the country! Thomas said they should have an answer t/m about delivery. I still haven't actually seen the car in person yet, so I'm all sorts of stoaked. They're also using the car for some photos for they're website to promote a few new products they're going to test on my car (Wheels, spoilers, fake fender vents, etc). I'll keep you guys posted.
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Joined: Mar 2011
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From: Richmond, VA
1989 300TE, 1981 380SL, 1990 325I, 2002 Overland, 1976 BMW 2002,
I think I may debadge the whole car. If I keep the badges I'll swap them out for C180.
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Joined: Mar 2011
Posts: 119
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From: Richmond, VA
1989 300TE, 1981 380SL, 1990 325I, 2002 Overland, 1976 BMW 2002,
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From: MI
2024 G63 AMG, 2022 GLE 63S AMG
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2019 GT3 RS, 2017 M3 30 Jahre
Nice! Please keep us updated. I know they've had experience with the M271 before, but it wasn't that great. Hopefully the EVO will be different.
AZNOptics is good. The Retrofit Source is also great quality as well.
I had the dealer remove the C250 badge and the "Blue Efficiency" Ovals as well.
AZNOptics is good. The Retrofit Source is also great quality as well.
I had the dealer remove the C250 badge and the "Blue Efficiency" Ovals as well.
Thread Starter
Member
Joined: Mar 2011
Posts: 119
Likes: 0
From: Richmond, VA
1989 300TE, 1981 380SL, 1990 325I, 2002 Overland, 1976 BMW 2002,
Nice! Please keep us updated. I know they've had experience with the M271 before, but it wasn't that great. Hopefully the EVO will be different.
AZNOptics is good. The Retrofit Source is also great quality as well.
I had the dealer remove the C250 badge and the "Blue Efficiency" Ovals as well.
AZNOptics is good. The Retrofit Source is also great quality as well.
I had the dealer remove the C250 badge and the "Blue Efficiency" Ovals as well.
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Joined: Sep 2009
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From: Dix Hills, New York
2012 C250 Coupe
Quick question... Why buy a C250 and then send it to RennTech for modification? The amount of money it would cost to get "suboptimal" gains would put you well into the territory of a C350, heck, probably close to the C63 as well... So - WHY?
However, I am intrigued by this, would be cool to know how much power RennTech can make out of the little bugger. I'm sure that if they make headway, others can learn from it and you will see other companies offer packages and upgrades!
As far as AZNOptics go, it was pretty much a startup from a fellow Forum member here on the boards (AZNC300). So he has always taken care of fellow forum members and W204 owners. The warranty has been awesome, and the products have been second to NONE IMO. The research and time Mike put into developing these products has really paid off. You KNOW its going to work when you get it. The LEDs have resistors pre-installed so you don't get flickering or light-out messages, and the HID kits have error cancelers BUILT-IN. So it really gives you peace of mind!
However, I am intrigued by this, would be cool to know how much power RennTech can make out of the little bugger. I'm sure that if they make headway, others can learn from it and you will see other companies offer packages and upgrades!
As far as AZNOptics go, it was pretty much a startup from a fellow Forum member here on the boards (AZNC300). So he has always taken care of fellow forum members and W204 owners. The warranty has been awesome, and the products have been second to NONE IMO. The research and time Mike put into developing these products has really paid off. You KNOW its going to work when you get it. The LEDs have resistors pre-installed so you don't get flickering or light-out messages, and the HID kits have error cancelers BUILT-IN. So it really gives you peace of mind!
Last edited by jctevere; Nov 17, 2011 at 08:05 PM.
Thread Starter
Member
Joined: Mar 2011
Posts: 119
Likes: 0
From: Richmond, VA
1989 300TE, 1981 380SL, 1990 325I, 2002 Overland, 1976 BMW 2002,
Quick question... Why buy a C250 and then send it to RennTech for modification? The amount of money it would cost to get "suboptimal" gains would put you well into the territory of a C350, heck, probably close to the C63 as well... So - WHY?
However, I am intrigued by this, would be cool to know how much power RennTech can make out of the little bugger. I'm sure that if they make headway, others can learn from it and you will see other companies offer packages and upgrades!
As far as AZNOptics go, it was pretty much a startup from a fellow Forum member here on the boards (AZNC300). So he has always taken care of fellow forum members and W204 owners. The warranty has been awesome, and the products have been second to NONE IMO. The research and time Mike put into developing these products has really paid off. You KNOW its going to work when you get it. The LEDs have resistors pre-installed so you don't get flickering or light-out messages, and the HID kits have error cancelers BUILT-IN. So it really gives you peace of mind!
However, I am intrigued by this, would be cool to know how much power RennTech can make out of the little bugger. I'm sure that if they make headway, others can learn from it and you will see other companies offer packages and upgrades!
As far as AZNOptics go, it was pretty much a startup from a fellow Forum member here on the boards (AZNC300). So he has always taken care of fellow forum members and W204 owners. The warranty has been awesome, and the products have been second to NONE IMO. The research and time Mike put into developing these products has really paid off. You KNOW its going to work when you get it. The LEDs have resistors pre-installed so you don't get flickering or light-out messages, and the HID kits have error cancelers BUILT-IN. So it really gives you peace of mind!
Thread Starter
Member
Joined: Mar 2011
Posts: 119
Likes: 0
From: Richmond, VA
1989 300TE, 1981 380SL, 1990 325I, 2002 Overland, 1976 BMW 2002,
