Turbo Boost

[Archive]

I just installed a Christmas present(boost guage)and need some information. I followed the instructions that came with the guage(ISSPRO) as to where to connect the line to the engine. Which the instruction said to install the line in a port under the air intake horn close to the front of the motor, they said it should have a plug in it. I found the plug, removed it and installed the line going to the guage. . No problem! How is the guage suppose to act? When I go thru the gears, the guage goes up to about 15-20 lbs, then when I reach 60 mph in 5th, it drops back to about 6 lbs. Is that what it is suppose to do? I don't believe that I over tightened fittings on the line. The numbers sounds kind of strange... .

Thanks
Rick

------------------
RICK
97 2500,CC,5 SPEED, 3. 54 Limited Slip,Psychotty System,K&N, Pre-Turbo ISSPRO 3" Pyrometer & Boost Guage,Silencer Ring Removed
12,000 RBW 5th Wheel Hitch,25' Excel 5th Wheel,Rancho RSX17000 Shocks,Amsoil Dealer,Straight Piped

 

[Archive]

Rick, I think your gauge is working properly. The boost pressure will increase when you put the engine under load. You will really see the gauge react when you start going up a hill.
---
Al

------------------
92-LE,4x4,5spd,3. 54,Borgeson steering shaft, Tach,Isspro Pyro & Boost, 16cm2, PW injectors

 

[Archive]

That's how it works. Just cruising along boost is low, put a load to the engine and up she goes. Your guage is working ok.

 

[Archive]

That is normal for it to run at about 4-6 lbs at 60? I thought that it would be running about 10-15 lbs at that speed. The rpms are about 1800 at 60. It just seemed a little strange, but this is the fist boost guage that I have seen work too. .

Rick

------------------
RICK
97 2500,CC,5 SPEED, 3. 54 Limited Slip,Psychotty System,K&N, Pre-Turbo ISSPRO 3" Pyrometer & Boost Guage,Silencer Ring Removed
12,000 RBW 5th Wheel Hitch,25' Excel 5th Wheel,Rancho RSX17000 Shocks,Amsoil Dealer,Straight Piped

 

[Archive]

The engine has to be working pretty hard to make 15 lbs boost - or else you have to have one of the smaller compressor housings to enhance low rpm boost. My '91 only runs several pounds boost at freeway cruising speed - and about 20 lbs at full boost pulling a load up a Sierra grade...

------------------
Early '91 250, 727 AT, 307 rear... Banks Stinger exhaust, intercooler... US Gear OD... MORE than a match for every new PS Ford encountered so far...

 

[Archive]

I just wanted to make sure that it was working correctly. .

Rick

------------------
RICK
97 2500,CC,5 SPEED, 3. 54 Limited Slip,Psychotty System,K&N, Pre-Turbo ISSPRO 3" Pyrometer & Boost Guage,Silencer Ring Removed
12,000 RBW 5th Wheel Hitch,25' Excel 5th Wheel,Rancho RSX17000 Shocks,Amsoil Dealer,Straight Piped

 

[Archive]

Rick,the boost gauge on a diesel is much like a vacuum gauge on a gasser,the higher the reading the worse fuel economy you are getting. My 12 valves run at about 4-5 psi on the flat empty

------------------
95' 25004X4,AT,Driftwood,Banks Stinger,Warn fender flairs and running boards(work truck)
95 3500,5 speed 3:54,Driftwood,Banks&Psycotty,34,000 GCVW apple and tractor hauler(works harder truck)

 

[Archive]

Rick, mine runs about 5-6psi at 70mph (about 2000rpm). In town under 30mph or so the gauge doesn't even register.

Vaughn
- = - = - = - = - = - =
'01 2500, QC SB 2wd, Autometer gauges

 

[Archive]

Thanks guys for the information. . isn't it great to have a place that if you have a question you can get it answered!! I really appreciate the responses. I'm still new to the Cummins engine and I need a place like this to put my concerns to rest or get questions answered as the case might be. .

Thanks again. .

Rick

------------------
RICK
97 2500,CC,5 SPEED, 3. 54 Limited Slip,Psychotty System,K&N, Pre-Turbo ISSPRO 3" Pyrometer & Boost Guage,Silencer Ring Removed
12,000 RBW 5th Wheel Hitch,25' Excel 5th Wheel,Rancho RSX17000 Shocks,Amsoil Dealer,Straight Piped

 

[Archive]

Stock mine ran about 4psi at 60mph. Now with the 370s, 16cm housing and 16btdc timing, it sits on 0 at 60 on a flat even pulling my trailer. As I start to go up a slight hill it will come off 0 and climb as the engine start to work. shortly after I have to turn the heat down as the motor finally starts to make some heat. Pretty efficient if you ask me.

------------------
1972 Chinook class C with 96/215 5spd, 4/5" exh, 4"BD, MagHytec, 85gal fuel, K&N RE0880, AutoMeter, 370's, BD gov kit, BD afc kit, 16cm, 16%btdc, yada-yada-yada
www.fostertruck.com/cummins

 

[Archive]

Rick; Any 18 wheeler truck driver worth his salt,lives and drives by his manifold press.
exhaust temp. and tachometer gauges. He uses
these indications to make gear selections and run his engine in the optium performance parameters. You should do the same, except you dont have 12 gears ranges . Happy motoring

 

[Archive]

12 gears ??? #ad
my 12v92TTAI Petercar with a 5 & 4 twin stick had 20 #ad
( ex 12v71 Monfort )



[This message has been edited by JNutter (edited 01-04-2001). ]

 

[Archive]

I wonder how I can get that many gears under my truck. . I would like to be able to shift my NV4500 5 speed like the big rigs do without the clutch. .

Rick

------------------
RICK
97 2500,CC,5 SPEED, 3. 54 Limited Slip,Psychotty System,K&N, Pre-Turbo ISSPRO 3" Pyrometer & Boost Guage,Silencer Ring Removed
12,000 RBW 5th Wheel Hitch,25' Excel 5th Wheel,Rancho RSX17000 Shocks,Amsoil Dealer,Straight Piped

 

[Archive]

I would like to be able to shift
my NV4500 5 speed like the big rigs do without the clutch. .

You can, It just takes practice.

[This message has been edited by JNutter (edited 01-04-2001). ]

 

[Archive]

My truck has 154,000 on the orginal clutch and(I bought the truck used),I think it is ready for a clutch and pilot bearing. After the trans warms up, I can do the 1st to 2nd easy, but when going to 3rd it bumps the gear a little and 4th wont go, so I have not tried 5th.
My dad use to deliver feed(in Arkansas) on a bob truck with a 10 ton feed body. He said that the gas(in line 6) would idle down so smooth, he would shift up and down and never touch the clutch. He also said that he broke the clutch rod and had to drive it back to the plant with 10 ton of feed still on. He said that on the low side of 1st, he could hold the shifter against first and then gently bump the shifter and it would jump into gear and the truck would start to move. And this is all done without grinding gears.

Rick

------------------
RICK
97 2500,CC,5 SPEED, 3. 54 Limited Slip,Psychotty System,K&N, Pre-Turbo ISSPRO 3" Pyrometer & Boost Guage,Silencer Ring Removed
12,000 RBW 5th Wheel Hitch,25' Excel 5th Wheel,Rancho RSX17000 Shocks,Amsoil Dealer,Straight Piped

 

[Archive]

Had an old (1959) White with Cummins power (220??) and a 5 speed with a 3 speed brownie at this place I worked right out of high school in 1976. Other than starting out we never used the clutch. Lots of fun splitting gears, like going from a main gear in over to the next higher main gear in under. Required about 3 hands at once. In fact the clutch broke once (I think it was hydraulic) and the boss drove it over 100 miles with no clutch at all. So yes it can be done, it just takes a lot of practice, and is better learned on someone else's truck #ad
. As a matter fact I always try to shift as if I did not have a clutch. This will obviously match RPM's very well and I feel it is a lot easier on the syncros and drive line. Didn't word that very well. I use the clutch always, but do try to match the RPM's.

Shelby

------------------
2001. 5 2500 QC LB 4WD, ETH, DEE, 3. 54 gears, Laramie SLT, Camper Special, Trailer Tow, Travel Convenience Group, Power Driver Seat, Alarm System, Remote Keyless Entry, Fog Lamps, Cab Clearance Lamps, HD Transfer Case, Bright White with a Gray Interior. Built 09-15-00, took delivery on 10-06-00, 1749 miles as of 11-25-00. Custom aluminum work body / flat bed. Coming soon: E-Brake and gauges.

 

[Archive]

Shelby,I got your message couldn't make any clearer. We've got it too easy with these modern manual trannies. Anyone who has driven an old before the days of syncros manual will know what you mean,you almost had to have your rpms right for the shift,clutch or not you couldn't shift if you didn't.

 

[Archive]

RHarvey, I shift my Ram without the clutch. . the light turns green, let out the pedal, and keep shifting (spent plenty of time in a T600 with a 9speed). Downshifts are sometimes not do-able as the flywheel is too light and spins quite freely compared to a big truck, making it tough to match revs.

------------------
97 2500 CC 4x4 3. 54 5spd, Green, #12 plate slid all the way forward, 4inch open exhaust, 235/85 Michelins, RS 9000's, PrimeLoc, Red Tops, TDR cloisonae grill badge!

 

[Archive]

I just figured out the other day that I can shift my getrag without the clutch other than pulling out. Pretty slick.

------------------

• '93 250 LE 4x4 5spd 4:10 Loaded,dual 5" chrome stacks,12cm² turbo(37psi),PW injectors,K&N,pyro/boost,US Gear E-Brake,tool box,CB,10" AR rims, 285/75/16 Bf goodrich. "wirenut_21529" on Yahoo Messenger
• '97 Ford B-Series school bus (5. 9 Cummins!)I'm gonna Bomb it!
• '94 GMC 2500 6. 5L Turbo

PICTURES.

 

[Archive]

Instruction please!!! Define 'matching rev's'. I don't have the big toy experience that you guys have had. . I want to learn to shift without the clutch.

Rick

------------------
RICK
97 2500,CC,5 SPEED, 3. 54 Limited Slip,Psychotty System,K&N, Pre-Turbo ISSPRO 3" Pyrometer & Boost Guage,Silencer Ring Removed
12,000 RBW 5th Wheel Hitch,25' Excel 5th Wheel,Rancho RSX17000 Shocks,Amsoil Dealer,Straight Piped