Project LQ4 - V8 S10 - Sold.
- Thread starter BrandonHall10
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BrandonHall10
Solving problems
Re: Project LQ4 - V8 S10 - Fueling issues solved.
Should be good. Here's how it breaks down...
W-body fuel pressure is 3 bar (43.5 psi).
Truck fuel pressure is 4 bar (58.0 psi). This is a 33% increase.
L67 injectors flow 36lb @ 3 bar. Multiply that times 33%, makes them closer to 45lb.
LQ4 injectors flow 25lb @ 4 bar.
So... If we push 4 bar through L67 injectors, they now flow 45lb. This is an 80% increase over the stock 25lb LQ4 injector.
The general consensus is, you need to increase your fuel systems flow capacity by at least 30% for E85 over pump gas. At 80% over the stock injector flow rate, I should have plenty of headroom on the L67 injectors even after the increased demand of E85.
This is all assuming my math is even remotely close to correct.
Should be good. Here's how it breaks down...
W-body fuel pressure is 3 bar (43.5 psi).
Truck fuel pressure is 4 bar (58.0 psi). This is a 33% increase.
L67 injectors flow 36lb @ 3 bar. Multiply that times 33%, makes them closer to 45lb.
LQ4 injectors flow 25lb @ 4 bar.
So... If we push 4 bar through L67 injectors, they now flow 45lb. This is an 80% increase over the stock 25lb LQ4 injector.
The general consensus is, you need to increase your fuel systems flow capacity by at least 30% for E85 over pump gas. At 80% over the stock injector flow rate, I should have plenty of headroom on the L67 injectors even after the increased demand of E85.
This is all assuming my math is even remotely close to correct.
Fivefingerdeathpunch
New member
Re: Project LQ4 - V8 S10 - Fueling issues solved.
Did you buy a alcohol sensor or are you just going to run open loop?
I feel you'll have problems with fuel trims without a sensor. E85 is great but tuning can be trouble some if the computer doesn't know what the alcohol content is.
Did you buy a alcohol sensor or are you just going to run open loop?
I feel you'll have problems with fuel trims without a sensor. E85 is great but tuning can be trouble some if the computer doesn't know what the alcohol content is.
BrandonHall10
Solving problems
Re: Project LQ4 - V8 S10 - Fueling issues solved.
I'll probably still run closed loop and just change stoich in the tune.
Our E85 seems to stay a pretty consistent. Every time I've tested it it's between 85% and 90%. I use the "Quick fuel" vial type tester.
I may someday switch PCM's or OS's or whatever I need to run a content sensor, but I'm not anywhere near that yet.
I'll probably still run closed loop and just change stoich in the tune.
Our E85 seems to stay a pretty consistent. Every time I've tested it it's between 85% and 90%. I use the "Quick fuel" vial type tester.
I may someday switch PCM's or OS's or whatever I need to run a content sensor, but I'm not anywhere near that yet.
BrandonHall10
Solving problems
Re: Project LQ4 - V8 S10 - Fueling issues solved.
In a continued effort to control the airflow through the radiator, I made some baffles for the grill.
Shortly after this picture was taken, the baffles were painted satin black and pop riveted into place. Meh.
In a continued effort to control the airflow through the radiator, I made some baffles for the grill.
Shortly after this picture was taken, the baffles were painted satin black and pop riveted into place. Meh.
SgtMarshal
Active member
Re: Project LQ4 - V8 S10 - Fueling issues solved.
I added an ethanol content sensor to my 2008 GXP, was a simple process adjusting the tune for it. am really liking the flexfuel capability.
I added an ethanol content sensor to my 2008 GXP, was a simple process adjusting the tune for it. am really liking the flexfuel capability.
BrandonHall10
Solving problems
Re: Project LQ4 - V8 S10 - Fueling issues solved.
I bet I could log the ethanol content with a stock sensor wired into my MPVI Pro... I'll cross that bridge when I get there.
In the meantime, I mounted the power steering fluid cooler. Not the most important thing on the "to do" list, but the price was right. It was in the pile of leftover donor truck parts and I had some spare time.
Pretty happy with how it tuned out. Still need to plumb it, but that shouldn't be too hard. Thinking I can probably get away with just using high pressure hose clamps. It'll be on the low pressure side...
I bet I could log the ethanol content with a stock sensor wired into my MPVI Pro... I'll cross that bridge when I get there.
In the meantime, I mounted the power steering fluid cooler. Not the most important thing on the "to do" list, but the price was right. It was in the pile of leftover donor truck parts and I had some spare time.
Pretty happy with how it tuned out. Still need to plumb it, but that shouldn't be too hard. Thinking I can probably get away with just using high pressure hose clamps. It'll be on the low pressure side...
BrandonHall10
Solving problems
Re: Project LQ4 - V8 S10 - Power steering issues getting fixed...
Had a good haul at the junkyard today. A high pressure power steering hose, Cherokee sector shaft, and 3 PCM connectors.
A quick cut with the grinder, a couple dabs of weld and a little satin paint and the new steering shaft was done.
So much tighter than that sloppy rag joint.
Tighter steering and more header clearance; Win, win!
Tomorrows plan is to replace the power steering hose and adapter in the back of the pump. Not sure which one is causing the leak, but it's been leaking since day one of the swap. That will also give me a chance to plumb the cooler I mounted the other day...
Had a good haul at the junkyard today. A high pressure power steering hose, Cherokee sector shaft, and 3 PCM connectors.
A quick cut with the grinder, a couple dabs of weld and a little satin paint and the new steering shaft was done.
So much tighter than that sloppy rag joint.
Tighter steering and more header clearance; Win, win!
Tomorrows plan is to replace the power steering hose and adapter in the back of the pump. Not sure which one is causing the leak, but it's been leaking since day one of the swap. That will also give me a chance to plumb the cooler I mounted the other day...
BrandonHall10
Solving problems
Re: Project LQ4 - V8 S10 - Power steering issues getting fixed...
Power steering cooler is plumbed. I'm really happy with how that turned out. Should make a big difference when it heats up again next summer. Also, I think I found the cause of my perpetual power steering fluid leak:
I assumed it was leaking at the fitting. Some sort of mismatch between the LQ4 pump and the S10 hose. Low and behold, the pressure line had a gouge in it. Fingers crossed, that will fix it.
Power steering cooler is plumbed. I'm really happy with how that turned out. Should make a big difference when it heats up again next summer. Also, I think I found the cause of my perpetual power steering fluid leak:
I assumed it was leaking at the fitting. Some sort of mismatch between the LQ4 pump and the S10 hose. Low and behold, the pressure line had a gouge in it. Fingers crossed, that will fix it.
Scottydoggs
Killa Bee
Re: Project LQ4 - V8 S10 - Power steering issues getting fixed...
that looks wet enough to me. score.
on another note. your tranny made 3 pulls last night at the track. felt damn good.
that looks wet enough to me. score.
on another note. your tranny made 3 pulls last night at the track. felt damn good.
BrandonHall10
Solving problems
Re: Project LQ4 - V8 S10 - Power steering issues getting fixed...
Awesome! I was curious how much difference a new tight trans would make.
Awesome! I was curious how much difference a new tight trans would make.
Scottydoggs
Killa Bee
Re: Project LQ4 - V8 S10 - Power steering issues getting fixed...
it dint make much as of yet. i also added meth, got real meth at the track, turned up my timing a bunch and could not hook up at all. spun em on all 3 runs, even the last one where i milked it off the line still made the tires screech when i nailed it.
moral of the story is, someone needs better tires lol i went a 10 th faster and a mph faster on the best time, hit 99 mph on another. all my 60's were 2.3 ish.
it dint make much as of yet. i also added meth, got real meth at the track, turned up my timing a bunch and could not hook up at all. spun em on all 3 runs, even the last one where i milked it off the line still made the tires screech when i nailed it.
moral of the story is, someone needs better tires lol i went a 10 th faster and a mph faster on the best time, hit 99 mph on another. all my 60's were 2.3 ish.
BrandonHall10
Solving problems
Re: Project LQ4 - V8 S10 - Power steering issues getting fixed...
Well frigg. Looks like it's leaking where the pump meets the reservoir. Standby for "Rebuilding a GM saginaw style power steering pump" pictures...
Well frigg. Looks like it's leaking where the pump meets the reservoir. Standby for "Rebuilding a GM saginaw style power steering pump" pictures...
BrandonHall10
Solving problems
Re: Project LQ4 - V8 S10 - Power steering issues getting fixed...
In the meantime, CAI!
The shield is not airtight, but it should isolate most of the engine heat. I hope to see a substantial IAT drop when cruising.
In the meantime, CAI!
The shield is not airtight, but it should isolate most of the engine heat. I hope to see a substantial IAT drop when cruising.
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BrandonHall10
Solving problems
Re: Project LQ4 - V8 S10 - Power steering issues getting fixed...
Well I'm going to call that a success. With an ambient temperature of around 95°, I would see consistent sub 100° IAT's while cruising. They would shoot back up to about 120° while sitting at a stop light, but drop right back down once I started rolling again.
So much better than the consistant 160°+ I had before. Can't wait to see what this thing is like when we get some actual cooler (sub 60°) temps!
Well I'm going to call that a success. With an ambient temperature of around 95°, I would see consistent sub 100° IAT's while cruising. They would shoot back up to about 120° while sitting at a stop light, but drop right back down once I started rolling again.
So much better than the consistant 160°+ I had before. Can't wait to see what this thing is like when we get some actual cooler (sub 60°) temps!
BrandonHall10
Solving problems
Re: Project LQ4 - V8 S10 - Random postings
This never gets old.
Can't wait till it has some actual chop
This never gets old.
Can't wait till it has some actual chop
BrandonHall10
Solving problems
Re: Project LQ4 - V8 S10 - Random postings
Like a glove...
Like a glove...
Scottydoggs
Killa Bee
Re: Project LQ4 - V8 S10 - Random postings
got to love them slots gm put in the bed.
got to love them slots gm put in the bed.
SgtMarshal
Active member
Re: Project LQ4 - V8 S10 - Random postings
i'm looking at a 89 dodge dakota for a swap. i'm definitely getting the truck, just not sure if the swap will happen
i'm looking at a 89 dodge dakota for a swap. i'm definitely getting the truck, just not sure if the swap will happen
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