Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Alpine Coach Owner's Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
 
Thread Tools Search this Thread Display Modes
 
Old 05-23-2005, 01:05 PM   #1
Senior Member
 
rockcj's Avatar
 
Join Date: Apr 2005
Location: Anaheim Hills, CA
Posts: 120
http://www.vehiclefx.com/index.asp?P...ROD&ProdID=100

What do you think?

David
05 Alpine
__________________

__________________
rockcj is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 05-23-2005, 01:05 PM   #2
Senior Member
 
rockcj's Avatar
 
Join Date: Apr 2005
Location: Anaheim Hills, CA
Posts: 120
http://www.vehiclefx.com/index.asp?P...ROD&ProdID=100

What do you think?

David
05 Alpine
__________________

__________________
rockcj is offline   Reply With Quote
Old 05-23-2005, 08:04 PM   #3
Senior Member
 
Join Date: Aug 2004
Posts: 437
It seems they are making unsubstanciated claims to me. I couldn't find anything on how it worked or laboratory tests conducted. Also, I question their claim about adding more heat by adding more fuel alone (as the chip programming does". Typically, the engine runs hotter if it is lean...has more oxygen that required for complete combustion. As an example, for those who have experience with gas welding, when is the torch the hottest? Answer: when it is "rich" in oxygen. I also don't understand the claim of a flat torque curve. I believe torque is related to the physical properties of the engine and I am not convinced that fuel control can flatten the torque curve out while increasing the RPM (increasing the horsepower). If RPM is limited then the claim of a flat torque curve can certainly envisioned, but the description claims increasing to max horsepower with a flat (maximum) torque curve...doesn't make sense to me. It is certainly interesting but I would need a lot more information on how it really works and see some testing results.
__________________
Steve
'01 Alpine 36 FDDS
SteveS is offline   Reply With Quote
Old 05-24-2005, 10:43 AM   #4
Senior Member
 
Join Date: May 2004
Location: Auburn, CA, Havasu, AZ & Mulege, BCS
Posts: 5,217
I'd agree w/Steve- not enough info to make any kind of sound judgement.
Diesel combustion is fairly simple- inject fuel into cylinder w/air in it, & compress till it ignites. You can inject sooner or later. Or you can "shape" the injection charge by doing a multi-step injection, or you could inject from more than one injector, or you can swirl the charge... All these affect timing BTDC.
Or you can vary the air, via turbo-charging.
More fuel = more heat. More air compression, absent compensation, = more heat (compensation is via inter-cooling or charge-air cooling).
Everything Cat or Cummins has done in the last 10 years, to my knowledge, is a variation on the above. Variable turbo boost, super-ultra-fancy injectors (Cat has some that are individually programmable & have to be "flashed" furgoodnez sake), higher injection pressure for better spray pattern, reworked fuel/air/timing tables, etc.
Other than the vague claim of "optimization," the website says nothing about what they do to improve power/efficiency. Not that Cummins has the perfect control system, but they have to mess w/something & I'd want to examine exactly what before hooking their gizmo up to my expensive hot rod. Just my $0.02.
__________________
Baja-tested '08 2-slide 36'
Alpine: The Ultimate DIY'er Project
EngineerMike is offline   Reply With Quote
Old 05-24-2005, 11:26 AM   #5
Senior Member
 
Join Date: May 2004
Location: Auburn, CA, Havasu, AZ & Mulege, BCS
Posts: 5,217
BTW, Steve- I've got gauges on my GM 6.5 turbo diesel coach, & it is true that adding more fuel beyond the point of the engine's ability to convert it to power, yields nothing but heat (OK, more smog too). I can hit a hill & jump to 1100 degrees EGT, then stomp on it adding no more boost but adding fuel- all I get is 1275 EGT (ouch) & no more GO-GO. Those who have this engine but "thought" big-block gas, frequently made the mistake of dropping down a gear to "pump more fresh air thru the block to keep things cool." That too was counter-intuitive; higher rev's put the computer higher in the boost curve, sending more compressed air to the cylinders (w/out inter-cooling on our model). If you've had an air compressor, you know that compressing air causes heat; for a turbo it's somehwere ~+300 degrees for heavy boost demand, so if you don't cool that down before entering the cylinder, it comes straight out in ~+300 added EGT (& head temps, which can cause cracked castings it you let it get outa control). The "gas" thinkers, who would have been correct for naturally aspirated gasoline, were jumping their EGT's & head temps by 150-250 degrees w/no benefit.
The diesel control & output variables are different than gas to sufficient extent, that some seat of the pants reactions are counter-intuitive. That reinforces the conclusion that more info is needed to evaluate the claims by this after-market outfit. My guess is that their main market is pick-up owners who are less concerned w/warranties on their rigs than we are (despite the rather bold claim that the package won't void warranty).
__________________
Baja-tested '08 2-slide 36'
Alpine: The Ultimate DIY'er Project
EngineerMike is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Performance Module for Cummins ISL 400 Tom Curnow Cummins Engines 7 01-08-2009 10:59 PM
CUMMINS 6.7 340HP WITH ALLISON 2500 5 SPEED PERFORMANCE? jbpack1 Class A Motorhome Discussions 9 02-19-2008 07:25 AM
Cummins ISL overheating update John_Canfield Winnebago Industries Owner's Forum 11 12-19-2007 09:44 AM
Cummins 5.9 L ISB performance 10sne1 Freightliner Motorhome Chassis Forum 12 04-13-2007 01:29 PM
CUMMINS 6.7 340HP WITH ALLISON 2500 5 SPEED PERFORMANCE? Toads and Motorhome Related Towing 9 12-31-1969 07:00 PM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 05:28 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.