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08-04-2013, 08:24 AM
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#1
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2 Rivet Member 
Austin
, Texas
Join Date: Oct 2009
Posts: 38
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RennTech Modification Questions
Noticed that some owners have opted to modify their Interstate with a RennTech modification that boosts the power of the vehicle.
Any thoughts on this modification?
Pros and cons?
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08-04-2013, 08:42 AM
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#2
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3 Rivet Member 
2011 Interstate Coach
Tulsa
, Oklahoma
Join Date: Aug 2011
Posts: 171
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Our I3500 got the Renntech upgrade at mile 5000. I have no complaints at all. The performance is very good, but not radical. We may have lost .5mpg but it is well worth the performance gains. Our present mpg number are 19.0-19.5. The power gains at 62-75mph, give you the power to pass another vehicle comfortably. I felt the power curve in that range was a bit flat. Don't misinterpret me, at those speeds, I am not trying to seek out vehicles to pass but there were situations that called for it.
I would suggest the upgrade. All pros, no cons.
Road Jager
__________________
Road Jager
Living On Tulsa Time
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08-04-2013, 01:00 PM
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#3
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2 Rivet Member
Austin
, Texas
Join Date: Oct 2009
Posts: 38
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Do the ECU adjustments affect the warranty?
From what I understand, each time the dealer or whomever tunes the Interstate, the ECU needs to be sent back to RennTech for reprogramming. However, it's a free reprogram, except for the mailing charges. Is this correct?
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08-04-2013, 05:08 PM
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#4
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3 Rivet Member
2011 Interstate Coach
Tulsa
, Oklahoma
Join Date: Aug 2011
Posts: 171
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That is something you should ask Renntech. They are very approachable.
Road Jager
__________________
Road Jager
Living On Tulsa Time
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08-05-2013, 05:40 PM
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#5
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Rivet Master 
2011 Interstate Coach
Overland Park
, Kansas
Join Date: Aug 2011
Posts: 2,798
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Don't know about Mercedes but Chevy will void powertrain warranty if they discover a tune or remnants of one.
__________________
Glass half full or half empty to an engineer is the glass is twice as big as it needs to be. 
2011 Interstate SOLD!  Upfitted 2017 Transit 350. SOLD! 
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08-05-2013, 07:47 PM
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#6
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4 Rivet Member 
Currently Looking...
2014 Interstate Ext. Coach
Boca Raton
, Florida
Join Date: Jul 2011
Posts: 358
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Being down in Florida I had ours tuned at Renntech in palm beach.
Ours is a 2010 on a 2008 chassis which I believe only made about 154 hp. Versus the newer ones which make 180 hp.
To us it was a big improvement. Much more getup and go. And definitely agree better highway passing power.
Also lost about 1 mpg in fuel consumption.
I don't think the ECU has to be reprogrammed after service. According to service center they only use ECU to read vehicle, not reprogram it. And Renntech agrees. But they would reprogram if need at no additional cost.
One thing with ours is that due to the older year they were not able to remove speed limiter although they said they could work on it. But to us going over 80 is really not that important or safe and comfortable.
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08-06-2013, 05:42 AM
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#7
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Figment of My Imagination
2012 Interstate Coach
From All Over
, More Than Anywhere Else
Join Date: Dec 2011
Posts: 10,868
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Quote:
Originally Posted by 73shark
Don't know about Mercedes but Chevy will void powertrain warranty if they discover a tune or remnants of one.
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Chances are, Mercedes will NOT void the warranty. The reason I say this is, Mercedes Benz of Baton Rouge is both an authorized Sprinter dealer AND an authorized Renntech dealer!
Since finding this out, I'm giving serious consideration to having MBoBR give my Interstate the Renntech treatment next time it's in for scheduled maintenance.
__________________
I thought getting old would take longer!
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08-06-2013, 10:35 AM
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#8
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Rivet Master
2011 Interstate Coach
Overland Park
, Kansas
Join Date: Aug 2011
Posts: 2,798
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Interesting to know. Let us know what you learn.
Speaking of scheduled maintenance, where can I find what's in the A and B maintenance? Looked thru the Sprinter books but couldn't seem to find anything.
On another thread, someone stated that the Airstream web page had access to all of the installed equipment manuals. After about an hour of searching it, I couldn't find anything. Do you know where it is?
__________________
Glass half full or half empty to an engineer is the glass is twice as big as it needs to be.
2011 Interstate SOLD! Upfitted 2017 Transit 350. SOLD!
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08-06-2013, 10:44 AM
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#9
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Figment of My Imagination
2012 Interstate Coach
From All Over
, More Than Anywhere Else
Join Date: Dec 2011
Posts: 10,868
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Quote:
Originally Posted by 73shark
Speaking of scheduled maintenance, where can I find what's in the A and B maintenance? Looked thru the Sprinter books but couldn't seem to find anything.
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Schedule A is "Oil Service Plus" in the Sprinter Maintenance Booklet. Schedule B is "Maintenance Service" in the booklet. Listing begins on Page 10 of the booklet.
Quote:
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On another thread, someone stated that the Airstream web page had access to all of the installed equipment manuals. After about an hour of searching it, I couldn't find anything. Do you know where it is?
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I wish! Never have found some of them, like the one for the sliding step…
They do have PDF versions of many of the various Airstream manuals, but not installed component manuals that I can find.
__________________
I thought getting old would take longer!
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08-07-2013, 08:11 AM
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#10
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Newbie
2013 Interstate Coach
Fort Worth
, Texas
Join Date: May 2013
Posts: 290
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My question about the Renntech module is whether or not the vehicle will pass the Texas vehicle inspection with it installed. I had one vehicle fail inspection because the cover on the air filter had been replaced with the identical part from another GM product. The wrong brand name was painted on the cover!
__________________
Make errors — otherwise the Great Spirit realizes
you have finished your purpose on earth.
— Navajo saying
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08-07-2013, 11:27 AM
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#11
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3 Rivet Member
2011 Interstate Coach
Tulsa
, Oklahoma
Join Date: Aug 2011
Posts: 171
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Quote:
Originally Posted by joemikeb
My question about the Renntech module is whether or not the vehicle will pass the Texas vehicle inspection with it installed. I had one vehicle fail inspection because the cover on the air filter had been replaced with the identical part from another GM product. The wrong brand name was painted on the cover!
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It is not a module. It is a software upgrade. It should not effect the emissions testing in Texas.
Road Jager
__________________
Road Jager
Living On Tulsa Time
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08-07-2013, 11:29 AM
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#12
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3 Rivet Member
2011 Interstate Coach
Tulsa
, Oklahoma
Join Date: Aug 2011
Posts: 171
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Quote:
Originally Posted by Protagonist
Chances are, Mercedes will NOT void the warranty. The reason I say this is, Mercedes Benz of Baton Rouge is both an authorized Sprinter dealer AND an authorized Renntech dealer!
Since finding this out, I'm giving serious consideration to having MBoBR give my Interstate the Renntech treatment next time it's in for scheduled maintenance.
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Protag,
Get it done, money well spent. I have never regretted it or had ANY issues with it.
Road Jager
__________________
Road Jager
Living On Tulsa Time
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08-15-2013, 08:19 PM
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#13
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3 Rivet Member
2014 Interstate Ext. Coach
Springfield
, Missouri
Join Date: Jul 2013
Posts: 114
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Can anyone tell me the difference between this software upgrade and the two channel tuning module that the sprinter store is offering? Has anyone had any experience with the tuning module?
Jeff
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