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Car Forum / Dodge / Dodge Trucks / May 2007

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Performance Plate on old style Cummins

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Jimi - 24 May 2007 05:12 GMT
Hi again,

     Thanks for giving me suggestions on what the repair could have been on
my older style Cummins '98 Manual 5 speed shifting problem a few postings
back. Now that I have the powertrain back in order, I want to put in what
this Diesel performance place calls a Performance plate on my injector pump.
He suggests that they take the pump out (R & R pump $300.00) then calibrate
the pump (calibration 275.00)  and then install performance plate ( retails
at 295.00). He claims I will get an additional 85 HP. The Cummins motor has
never been modified in any way. Can anyone speak from experience in doing
this? He says I will get a 25% loss in fuel savings as a result of the
modification also but have a guy at work telling me the total opposite, he's
saying my fuel consumption would be less as I gain HP. I dunno what to do
about this... any thoughts on this?...Thanks...jimi
Mike Simmons - 24 May 2007 10:49 GMT
> Hi again,
>
[quoted text clipped - 18 lines]
>come from, hmmmmm?  If you said the fuel, go to the head of the class!
>Remember, when dealing with HP vs. fuel economy, TANSTAAFL*!

Now,  you have a choice.. who do you believe... the guy at the diesel
performance shop (who does this for a living, BTW), or "a guy from work"?

Mike

*There ain't no such thing as a free lunch
Roy - 24 May 2007 12:06 GMT
> Hi again,
>
[quoted text clipped - 11 lines]
> less as I gain HP. I dunno what to do about this... any thoughts on
> this?...Thanks...jimi
How many miles on this engine? I thought you had a bunch. Stepping up the HP
leads to two things. More power and more parts. Everything downstream from
the engine is going to take a beating. So figure on clutch assy at the
least.
Regards fuel consumption. The Cummins make's power through additional fuel
and once you get ability to use the additional power, believe me you will.

Just a thought you may want to look into bigger injectors first. I'm not
sure how big you can go without other mods but it might be worth looking
into.

One other thing, maybe it is me but the price seems a bit steep for the work
involved. You might want to look into doing it yourself or shopping it
around. I'm sure one of the guy's at the tdr would walk you through it. Or
one of them might live near you and come over and help you. That's how that
group works.

You really should go here: www.turbodieselregister.com
and read up on what you want to do. The folks there drink diesel fuel
instead of coffee.
.boB - 25 May 2007 01:11 GMT
>  Hi again,
>
[quoted text clipped - 10 lines]
> saying my fuel consumption would be less as I gain HP. I dunno what to do
> about this... any thoughts on this?...Thanks...jimi

Here's a little more information on the plate:
http://www.o-f-i.com/index.php?page=sec/bd_performance.htm

Summit Racing sells the plate for $226.

If you make more power by making the engine more
efficient, then you'll get better mileage as long as
you don't use all that extra power.

But a diesel is a little differant.  It makes more
power in this case simply by adding more fuel, and
allowing more rpm's.  This will most likely cause a
decrease in fuel mileage.

So, you have to ask yourself.  Do you really "Need"
another 80'ish hp?  And are you willing to pay for it
at the pump?

Signature

.boB
2006 FXDI hot rod
2001 Dodge Dakota QC 5.9/4x4/3.92
1966 Mustang Coupe - Daily Driver
1965 FFR Cobra -  427W EFI, Damn Fast.

617211 - 25 May 2007 16:57 GMT
92 12 valve - bigger injectors & smaller turbo housing for more boost.
Went from 155hp to 205hp on dyno. Mileage didn't go down IF I didn't
use the extra hp - YOU WILL!!
John Kunkel - 25 May 2007 18:47 GMT
> Hi again,
>
>      Thanks for giving me suggestions on what the repair could have been
> on my older style Cummins '98 Manual 5 speed shifting problem a few
> postings back.

My age starts to show when I see a '98 referred to as "old". I think I'll go
have a good cry.
Roy - 25 May 2007 18:54 GMT
>> Hi again,
>>
[quoted text clipped - 4 lines]
> My age starts to show when I see a '98 referred to as "old". I think I'll
> go have a good cry.
The hell with the cry! I'm going for a beer.
Big Al - 26 May 2007 02:26 GMT
> > Hi again,
> >
[quoted text clipped - 4 lines]
> My age starts to show when I see a '98 referred to as "old". I think I'll go
> have a good cry.

I can still remember the 1955 car ads:)

Al
azwiley1 - 26 May 2007 06:15 GMT
> > > Hi again,
>
[quoted text clipped - 7 lines]
>
> I can still remember the 1955 car ads:)

1955, thanks for reminding me how old I could be!  ;^)
 
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