Engine/Transmission (1994 - 1998) 370's Kick @$$

[nfox]

I just installed my 370 injectors this afternoon and all i can say wow!! What a huge diifference in the way the power comes on and it will set your back in the seat pretty good now. Smoke is about the same at part throttle, but when you nail it she'll pour out the black coals and your instantly up to 40 pounds of boost and your gone. Life is great with 370's. Oo. Oo.

 

[MDKram]

What thickness of copper washer did you use and who did you get the 370's from?



Marc

 

[Swamp Donkey]

Hey Marc,





I got my 370's from Piers over a year ago. He told me to put in the the ones that were . 020 thick. Here's a a tip for ya... ... Piers has them on special this month. I think they were around 490 dollars. That is our funny money price. Go get em, you won't be disapointed.

 

[Jim Fulmer]

nfox



You like those don't ya... .



. 020 on the washer thickness, Piers gives you and install kit with the injectors and you use the thin washer, he says they clean-up better with it. I would be hard pressed to say a 40 HP increase, fells like more! I have a hole lot of fuel room now.



Jim

 

[nfox]

Idle after 370 installed

Have any of you guys after installing your 370's have to raise your idle speed back up? My idle speed dropped about 150rpm after installing the 370's.

 

[Jim Fulmer]

Mines a little different than most cause of the tight converter but I set mine up to 950 so I'm at 780 or so with the A/C on and in gear. Just keep and eye on it, remember 370's fuel more all the time, they could be loading up just a touch and they work much better with timing at 15. 5 vise 13. 5 like mine was.



Jim

 

[MDKram]

I finished the install of a PDR 35-14 and 370's in another members truck(98 12v, 5-spd, 2500). His application is hauling a big travel fifth wheel. His gross is 21500 lbs. I installed a #11 for him last year and slid it forward. He hauled through BC earlier this summer and his EGTs went over 1250 on long hills which forced him to back out of the go pedal. He did not like this so I moved his plate back. Then he did not like the loss in power. To make a long story short, I discussed different options with him and he decided to stay with an HX-35 and add injectors.



Adding the PDR 35-14 drop EGT by at least 150*F. Spool-up is better than stock and smoke was all but gone. Today I added the 370's and EGTs are back up but are easily managed. The low end power is so much stronger. Heck, the power everywhere is stronger. Smoke is non existent if you roll into the throttle on the bottom end. Smoke is noticeable but not obscene on the top end. I really have not been able to stay in the pedal for long as the truck accelerates really fast! I have to turn the truck over to the owner (Jim) on Tuesday so I will try and play a little tomorrow night. The #11 plate is positioned about 0. 030" shy of full forward.



Once my banker says go, I think I will put this same setup in my truck. Obviously Jim will still have to drive using the pyro while towing, but the PDR 35 should let him use around 300 RWHP under constant load.



Thanks to the guys who chimed in!



Oh yah, truck is much quieter at idle and while under light throttle driving. I had just finished bleeding the injectors and started the truck when I was called to dinner by the boss. She said, "that truck is much quieter than yours. " I thinks to myself, this may be the bargaining tool to get 370's!



Marc

 

[Jeff H]

In normal driving does mileage change? I do 400 - 600 a week. I need to keep it a lean mean machine.

How about that smoke too. Is there a haze cruising down the road?

Will I need higher floiwing delivery valves?

I've only got a 175 hp rated engine.

 

[Todd G]

My everyday mileage went down about . 5mpg mostly due to fogging people that deserve it. There is no smoke if you drive with a careful foot. I've got the same motor and I get a little stumble around 1200rpm. Here's the secret, don't drive at 1200rpm.

 

[The patriot]

Re: Idle after 370 installed

Originally posted by nfox

Have any of you guys after installing your 370's have to raise your idle speed back up? My idle speed dropped about 150rpm after installing the 370's.

Yes. I had to jack mine up. I think mine dropped more than 150 because it wouldnt idle until I turned it back up.

First thing I thought after a test ride was..... GSK!!

Eric

 

[bighammer]

I'm guessing (key words) the 370s don't atomize the fuel as efficiently (at lower flow) as the smaller injectors. The pump is delivering the same amount of fuel at idle, it just can't be burned as well requiring the idle setting increase.



Anybody know, are they larger holes or more of them?



(Still on the fence, here)

 

[HoleshotHolset]

The holes are larger and some of 'em aren't offset like the stockers... . this accounts for the piston bowl differences/etc between the OEM pistons and the marine pistons.



Stock holes look like this: - - - _ _ _

370's holes look like this: - - - - - -



Wish I had a pic... . ASCII art only gets you so far.....



Matt

 

[bighammer]

I think I get what you mean. Offset of the holes is for the angle of the injector to the top of the piston, right?

 

[HoleshotHolset]

Exactly.

 

[RHARVEY]

Does it make any difference on the brand of the injectors????? And also doesn't the truck smoke a little at idle?????



Rick

 

[MDKram]

No smoke at idle with the 370's I just installed, none! No smoke under light to medium acceleration either. Put her to the rugs, yes it does smoke a little. The #11 plate is almost full forward. Also added a PDR HX35-14 which probably helps the smoke situation.



Marc

 

[FATCAT]

Here is a question that I haven't seen

I soon will have 370's, 3K GSK, and the PDR HX40 turbo installed into my truck. My question is ... has anyone with this type of set up (or similar) had any problems with the U-Joints. Has anyone had a cage installed under the drive shaft incase the front U-Joint goes and you don't want to pole-vault the truck?



How much torque will the stock U-joints take or should people with the set up I will soon have seriously consider upgrading the U-Joints and/or install some type of loops under the driveshaft?

 

[Koa Man]

I have a setup similar to what you described and I never worry about the U joints breaking. I do not power brake or stall speed test my truck. I always roll on the power. The way my truck is set up and because I'm usually towing, the kind of "races" I look for is other trucks towing, preferably uphill.

 

[HoleshotHolset]

The DD injectors I have seen all had the original OEM offset on the end tip holes... . this makes for better economy/less smoke... .



Matt

 

[RHARVEY]

Would that cure the stumble at 1200rpms????



Rick