Engine/Transmission (1994 - 1998) water meth questions

[datablitz]

i was wondering if it would be worth my time to install 370 injectors in my truck, as well as some sort of water meth system, to help with egt's since i have a stock turbo... .



i tow occassionally, but most of my driving is commuting (daily driver 500 miles/week 60% city driving)



would this run too hot?

too smokey? (i like smoke, but if i can't control it..... )

not worth the money for the power gain?



see sig for current mods



Thanks for any input

 

[JGheen]

I would bump that timing up to at least 16* or maybe up to 18* and run it. You can always add the water/meth mix later if you want more juice. Injection timing advancement is a good key to stick with when going to big fuel like the 370s put out.

 

[ndurbin]

One thing I have found in my research of water/meth injection is most systems dont come on till about 20 lbs. of boost. Or it isn't recommended to use them below that. I'm not sure if u could use just water and inject it at lower boost levels.



I haven't been totally convinced it's what I need for my truck to help with EGTs. But the jury is still out on this one as there hasn't been much response on it's use while towing.



Nathan

 

[BPonci]

You might want to concider that increasing your timing with water meth also increases cylinder pressure. So you might keep your timing below 16. 0 to save your head gasket life. Just food for thought.

 

[JGheen]

You might want to concider that increasing your timing with water meth also increases cylinder pressure. So you might keep your timing below 16. 0 to save your head gasket life. Just food for thought.

Good point, there BPonci, forgot to mention the increased leakage possibility when throwing drugs into the cylinder with diesel.

 

[datablitz]

yea, i wasnt planning on going much higher timing, because of the added pressures...



side note, does anyone know how 370's do heat wise in a truck with a stock turbo?

 

[JGheen]

side note, does anyone know how 370's do heat wise in a truck with a stock turbo?

What do you mean "heat-wise??" EGTs, piston temp, engine temp?

 

[datablitz]

not running too high of an egt, while towing, or accellerating

 

[JGheen]

If you got the ability to breathe good with the 370s, I wouldn't see a problems with EGTs and towing. Maybe someone else has a bad EGT experience with 370s and towing, but haven't heard too many people complain about temps with their 370s.

 

[DSiemens]

You will like the 370's, but it might be a tad warm with a 6 plate. I tried that combo and change my 6 to a 10. It was much better for towing. A GSK works well with a 10 plate.

 

[Jim Fulmer]

You will like the 370's, but it might be a tad warm with a 6 plate. I tried that combo and change my 6 to a 10. It was much better for towing. A GSK works well with a 10 plate.



Someone that thinks like me.



Jim

 

[F8LDOSE]

Jim, how high has your egt's been under load? Last night i saw 1735 while pulling. I'm using 3- 675ml nozzles in the intake and one 325ml between turbo stages, w/ a 50-50 mix. Got my hobbs switch set at 40 lbs. Only 20 degree of pump timing. I'm only running 370 inj, i need more fuel extremely bad, truck hardly smokes, just grey. After watching the video looks like i was backing in and out of it but i had it at a steady 4200rpm, any ideas?

 

[Jim Fulmer]

Depending on the injectors and the way the pump is set up I'll see about 1600-1650 shooting (3) 625's, two on at 40 psi and 1 on at 60 and that is running at 80 psi but my injectors are small. There is no way I put as much load on my truck as you do!



My smoke is bad at boost and does have a little gray in it with the water on!



Jim

 

[CATCRACKER]

i have 370's, stock charger,no plate, full forward, afc wheel spun, timing at 18. i like it! i have no problems towing and no smoke pulling. i do get a light haze when i am idling in the morning until my truck is very warm. my egt's have never been over 1325 according to my bd gauges while max turbo pressure was 43. 5. i drive my truck very carefully though. i like to keep the turbo not more than 35lbs. my temps are not that bad b/c i dont have a gsk kit yet once fueling will go past 2500 things will get toasty. but by 2500rpms i am doing 80mph which is plenty fast for me. i need an hx40 and gsk's in a bad way. my guess i am around 350hp. jim f. not to get off the subject but does that sound about right?



later C

 

[Jim Fulmer]

That sounds about right in the H. P.



On my stock 180 pump I had a #4 in the stock position, 370's and 191's and was at 385/832, temps weren't bad on the dyno but bad on the road... ... . gauge was pegged. If you install a GSK your temps will climb hard, especially with no plate... ... hince no de-fuel on the top.



Your future mods sound good but I would add a plate to the mix..... opinion!



Jim

 

[BPonci]

Mine is smoke free because i live in Calif.

 

[datablitz]

jim, so, which the 370s, will i be able to control the temps, and be a little racy on the street? and tow heavy every once in a while?

 

[ProMac1K]

I've got the stock charger with the Bosch 370's, TST #6 kit, redneck version of the GSK , 18° of timing, and some internal delivery adjustments made on the test bench. Also have basically stock exhaust with a racing-style muffler and a K&N drop-in. With full throttle and the truck unloaded, i'm good until I get to lockup. Then I get 42+ lbs of boost with the orifice set where it's at and peg my 1500° EGT fairly quickly. :{ I don't have a lot of turbo lag with the small stock charger so that is good. When I drop the pedal from a stop, the smoke blows good for a couple seconds max, then the boost picks up and the smoke cuts off just like that, then it stays clean and the acceleration sucks until it shifts into lockup, when I get a noticeable dark haze which is fine. I hate the slow shift before OD, feels like the trans is guessing or arguing if it should go into the next gear or not.

Here's a smiley version of my truck's performance while shifting between drive to overdrive to lockup:

:-{} :--)

It just plain goes after it hits lockup! Guessing my trans could use some work. Shouldn't the truck perform in any gear and not make such a huge difference when the trans shifts into lockup? One of these times i'm not going to chicken out of buying a trans after I call Bill K. for help. Got to take the plunge! Got to take the plunge!



Trever

 

[Jim Fulmer]

jim, so, which the 370s, will i be able to control the temps, and be a little racy on the street? and tow heavy every once in a while?

Here is real data for you! Test truck is a 97' 5 Speed with 200k, it has a 10 type plate in it set on the dyno, timing at 17, 3K's, Stock turbo with an 18. 5 housing and 370's = 432 #2 only and 496 with a 50/50 mix water setup. EGT's fuel only are about 1750 going from the middle of 3rd to the top of 5th. Now turn the water on and EGT's are just at 1500... ... ... . yes it can play! That plate is a cheater as it get's the HP then cuts back fuel some on top to keep temps down a tad... ..... I think I can get 450 out of it on #2! The EGT drop with water is even more than I see but I think it's because of the 40 psi and the air is so hot the water does more good!



I've seen this again with an overfueled set of Twins that gained 15 psi of boost with the same setup of water..... Snowperformance Stage 2!



I can tell you ways of making that Stage 2 work for you in towing!



Jim