Aquaduct
Winchester, VA USA
Full Member
Joined: 05/30/2004
View Profile
|
Quote:Do you know how much of an effeciency increase a properly installed turbo will get for a gasser? I was reading a "wheels" article a while ago that claimed that almost any gasser can gain around a 20% jump in efficiency when a turbo is installed, but that sounds high to me.
Depends what they mean by efficiency. Volumetric efficiency of a normally aspirated SI engine will be about 80-90%. A turbo will bring that up to at least 100%. So that number would seem valid.
If they're talking about fuel consumption, you wouldn't get anything (assuming you're constrained to running at stoich with a modern, aftertreatment-equipped engine). The higher air flow would have to matched with the same relative amount of fuel.
However, if you were an engine designer and were using a turbo to get similar horsepower from smaller displacement, than you'd get the same fuel consumption at high load, high speed regimes of the turbo and probably a 10% reduction in fuel consumption elsewhere due to the smaller displacement.
Again, I only deal with production type engines that have to go into factory vehicles so I'm not as well versed on the ins and outs of racers and other vehicles without emissions and fuel economy contraints. So maybe someone else will prove me uninformed. That would be cool.
|
Hide Pounder
Kansas
Senior Member
Joined: 02/29/2004
View Profile
 Offline
|
After 350 post I don't think anyone will read this but here is my .02.
Just got back from 3300 mile trip from midwest to Washington DC. Averaged 8.8 MPG,
When I bought the F-350 Gaser in 2000 the PSD was a 5500.00 option I could not justify. At the time Diesel was higher that gas. As it is now in my area. Currantly Diesel is 1.89 and gas is 1.85. Not much diff. but some. I figure I can buy a lot of gas for the 5500.00 the PSD cost. And I don;t want to listen to it, and I don't want to smell the stuff on my hands everytime I fuel. I do that with my farm tractors. Every diesel pump I have seen is a nasty mess. I know Diesels are really good pullers and won't try to say any different. I have even considered trading but my 2000 is just about paid for and I don't want any payments for awile.
2000 Ford F-350 V-10 430 gears
Turnover Ball & Companion 5th wheel hitch
2000 Exis 4 horse trailer w/ dressing room sold the 5er
Randy, Debbie kids grown.
|
Hide Pounder
Kansas
Senior Member
Joined: 02/29/2004
View Profile
Offline
|
Didn't Trailer Life Mag. do a towing compairison several years ago with Fords V-10 vs the PSD? As I remember they drove them 100, 000 miles and cost vs cost it was a wash. What the Diesel saved in fuel it spent in maintance. So after 100,000 the costs were almost the same, wish I had kept that issue.
And why do they run them for 30 minutes at 0600 next to my camper all the time?
|
wkdelsol
sun city,ca. usa
New Member
Joined: 06/29/2004
View Profile
|
HIDE POUNDER
A big 10-4 on all your comments,what if us gassers put a gear splitter behand the tranny,could we keep up with the pds's?.Bert?
Yea shut off those diesels after five minute warm ups at 5:00 am.
|
BertP
Edmonton, Alberta, Canada
Senior Member
Joined: 11/07/2003
View Profile
|
Quote:Thanks for the reply Bert,guess i'll forget the turbo.
I didn't mean to turn you off from the turbo. Turbos can and are installed with great success - look at all the turbo diesels available. I just wanted to point out that you have to plan correctly. Otherwise, you could end up spending a fair amount of money ($3,000 - $5,000 last time I checked) and not get the results you expected.
Bert
|
|
|
Securiti
Washington PA 15301 USA
Senior Member
Joined: 09/23/2002
View Profile
|
I have a Dodge 3500. I used it for 4 years with a v-10 in it. Nothing but troubles. RPM,s allways ran high when towing. Sucked alot of gas. [5 to 6 miles to the gallon]. I had alot of problems with it. Now in the same truck is a cummins 5.9. And the only problem is dirty fuel pumps. I can not say anything bad about the diesel 30,000 miles later. Mind you it is the same truck. But with different motors.
PS: It now gets 12 to 15 miles to the gallon
Note: Due to invalid formatting, all formatting has been ignored.
Pictures of all
1996 Dodge 3500
4.88 Gears
GearVender Transmission
Extra 115 Gal Fuel tank
Banks Power Kit
K&N Air filter
5 Inch Exhaust
2007 Wide Open Endura Max
[email protected]
|
BertP
Edmonton, Alberta, Canada
Senior Member
Joined: 11/07/2003
View Profile
|
Quote:HIDE POUNDER
A big 10-4 on all your comments,what if us gassers put a gear splitter behand the tranny,could we keep up with the pds's?.Bert?
Yea shut off those diesels after five minute warm ups at 5:00 am.
That's the main reason that splitters exist. They do give you the advantage of easily changing the effective RE ratio to better match the situation. I have not used one (except for multi speed RE's in larger trucks which is what a splitter basically is) so I cannot comment on how effective they are or if there are any down sides to them.
Bert
|
rotbaron
Hendersonville TN.
Senior Member
Joined: 08/12/2004
View Profile
Offline
|
Quote:There is no way to win this....Everybody's situation is different.
For me it's simple, my truck is paid for. It has less than 60K miles, meticulously maintained. Anal service intervals with synthetics will allow it go many, many miles. My truck is lighter than a diesel allowing me to carry more. With the mods I have 320 hp and 440 lb ft of torque, did I mention I'm lighter than a diesel ![[emoticon]](http://www.coastresorts.com/sharedcontent/cfb/images/smile.gif "smile") I get 9-11 mpg in the mountains of AK fully loaded (10,500 without the trailer). My insurance is cheap. I am a professional diesel tech and am very aware of the benefits of the diesel engine. I just don't want to listen to one on my own time...I see no reason to take a hit on a vehicle I have babied and modified to upgrade to a $45K truck right now, I have other hobbies, a new house and a family to spoil.
Hey blt2ski, this truck came outta Yakima.....
alaska511 Has a good point. everyones situation IS different. Howeve if you are in the market for a vehicle then the compairson opens up.
A: Diesel Pro
1. Diesels are more fuel efficent than gas 100:1 air fuel ratio compaired to 14.7:1 for gas. Diesels are no meant to be cheap (other than fuel cost) they are mean't to be more durable.
2. To get equal in torque (what really counts) you have to go to a huge gas engine which consumes even more fuel.
B: Gas Pro
1. Gas is more readily available, I know you may not have trouble finding diesel, but fact is not every station has Diesel.
2. parts for gas engines on the whole are more economical.
3. Gas engines are in lighter vehicles. You won't get a Diesel in a 1/2 ton.
c:Neutral
1. Noise and smell. Diesels do make more noise and some don't like the exhaust and fuel odor. I happen to like it better than gas, but thats a personal thing.
One might conclude I drive a Diesel, when in fact I drive gas. If the Cummings had been available in 1/2 ton I would have a diesel. For those who love 3/4 an 1 ton thats great but those beat my back to death. If I drive one of Emergency Managements trucks it kills my back. My truck is an authorized emergency vehicle and I prefer to us it. The ride is like compairing a Cadallac to a dump truck to me. Yes it does limit my choices in trailers. A 1/2 ton will limit you to about 7500 GTW. I don't have any trouble towing as long as I keep my CGVW under the trucks limit. If one desires a 3/4 or ton truck then it becomes a choice factor. The Diesel will cost more initally but you will get better fuel mileage. If you trade every year or two you probably won't recover the cost. If you keep it long term it will save you money. If your like me and going light you don't have the option and will be stuck with gas. ASE Master automotive, Master HD truck, Paint & collision repair. Since 1976
05 Dodge CTD DRW 4x4
04 Citation 30T TT
|
wkdelsol
sun city,ca. usa
New Member
Joined: 06/29/2004
View Profile
|
Some thing tells me Bert P knows what he's talking about which is not always the case on this forum.
|
BertP
Edmonton, Alberta, Canada
Senior Member
Joined: 11/07/2003
View Profile
|
Thanks for the vote of confidence, but there ar many around these forums who know a great deal more than I do. I am just more tenacious than they are when discussing these topics. ![[emoticon]](http://www.coastresorts.com/sharedcontent/cfb/images/biggrin.gif "biggrin")
Bert
|
|
|
