Steel1 Pimpxs

Steel1 · Apr 21, 2019

According to Stingers site it looks like I may have over compensated in my reduction of cranking PW,
may be chasing my tail here.
I was originally fighting a lazy hot start and I must have pulled too much cranking PW, going to adjust and
try again when I have a chance.

a91what · Apr 21, 2019

Yeah your cranking PW numbers are very low, the last value on the curve is 9... that means it is going to multiply the VE table value by .09.... not nearly enough fuel. the last value in any table that deals in percentages like the cranking PW table MUST have the last value equal 100 or more unless specified in the manual. If you only want to add 9% the final value has to be 109%

Steel1 · Apr 30, 2019

Just to update...set the last cranking pw values at 100 and it fires right up at full operating temp.
Just need to fine tune lazy start at temps slightly less than full.

Steel1 · Jun 9, 2019

Still messing with lazy hot start, I've been slowly increasing cranking pw fueling and it gets better but not there yet.
Cold start pops right over.
Just want @a91what to take a look and see if there's something that pops out, took a log of cranking/starting hope it's long enough.

a91what · Jun 9, 2019

looks like it may still be starving for fuel right at startup, this can be fixed with priming PW most of the time. I made some small changes based on what i use for smaller CID with similar injector sizes.
Take a look at the changes i have made and then note that you can prime the engine twice by going KOEO before starting, if it starts easier then you need some more priming PW.

Steel1 · Jun 10, 2019

a91what said:
looks like it may still be starving for fuel right at startup, this can be fixed with priming PW most of the time. I made some small changes based on what i use for smaller CID with similar injector sizes.
Take a look at the changes i have made and then note that you can prime the engine twice by going KOEO before starting, if it starts easier then you need some more priming PW.

Ok, Thanks again !

Steel1 · Mar 24, 2020

Since my job is shut down for at least the next two weeks I've been trying to stay busy.
Thinking of having my Pimpxs take control of my dual electric Intrepid fans.
I've had them running off a Flexalite VSC33054 controller for years and it works fine but
thinking I should use the Pimpxs capabilities for this.
Looks like a fairly simple install using pin 55, a relay and installing a jumper in the ecu.
Any advice on this or what relay to run ? @a91what

a91what · Mar 24, 2020

Personally, I do fan control with a pwm output and a 100a ssr. The 40a versions work just as well. I still use the relay to interrupt power to the ssr so the fans shut down when wot, above a mph ect. Then I use a closed loop pwm control to target 200* stays within 3* of target.

96pushrod · Mar 24, 2020

a91what said:
Personally, I do fan control with a pwm output and a 100a ssr. The 40a versions work just as well. I still use the relay to interrupt power to the ssr so the fans shut down when wot, above a mph ect. Then I use a closed loop pwm control to target 200* stays within 3* of target.

I’ve never really messed with the pwm capabilities as far as fan control. I’ve had good luck with just having them switched on/off as far as temp control.

Steel1 · Mar 24, 2020

96pushrod said:
I’ve never really messed with the pwm capabilities as far as fan control. I’ve had good luck with just having them switched on/off as far as temp control.

So you're controlling your e-fan with the way I stated, relay off of pin 55 etc ?

96pushrod · Mar 24, 2020

Steel1 said:
So you're controlling your e-fan with the way I stated, relay off of pin 55 etc ?

Correct, I believe it’s pin 55. I run the ron Francis harness but I’m pretty sure it’s the same. I’ve never seen a reason to get all in depth with pwm and what not.

Steel1 · Mar 24, 2020

96pushrod said:
Correct, I believe it’s pin 55. I run the ron Francis harness but I’m pretty sure it’s the same. I’ve never seen a reason to get all in depth with pwm and what not.

Ok thanks.
Any idea what type/size relay you used ?

a91what · Mar 24, 2020

It is pin 55, use it to ground the relay. Most guys get away with a 40A bosch but they do sell larger if the fan pulls slot.
I use the mark8 2 speed fan, it can nearly kill the engine when it comes on in high speed. Pwm is like a soft start. Overkill yes

Steel1 · Mar 24, 2020

a91what said:
It is pin 55, use it to ground the relay. Most guys get away with a 40A bosch but they do sell larger if the fan pulls slot.
I use the mark8 2 speed fan, it can nearly kill the engine when it comes on in high speed. Pwm is like a soft start. Overkill yes

Thanks, that's the type of relay I was looking at.
I understand the theory of the PWM system, if I had your skills I would run it,
but for my abilities and the way I use my car I'm going to start with the simpler design.
Thanks again for the help folks.

96pushrod · Mar 24, 2020

Steel1 said:
Ok thanks.
Any idea what type/size relay you used ?

That’s the relay I use. I’d just say screw it and run a 60a with a 60a maxi fuse. Do it once and be done with it.

a91what said:
It is pin 55, use it to ground the relay. Most guys get away with a 40A bosch but they do sell larger if the fan pulls slot.
I use the mark8 2 speed fan, it can nearly kill the engine when it comes on in high speed. Pwm is like a soft start. Overkill yes

I want to say mine is setup to provide 12v to trigger the relay. I’m not sure though as I’ve slept since wiring it, but I’m fairly sure it provides power to trigger.
The sn95 fan is what I have it on, which is a 2 speed fan. My 150a alternator helps soften the blow, but it still needs to see a 100rpm increase to keep up. Never seen anything under 14.6 volts on the gauge with the fan running though.

Steel1 · Mar 24, 2020

My current VSC controller is rated at 45 amps , I haven't had a problems
with that set-up.
I think I'll go with a 40 amp relay.

96pushrod · Mar 24, 2020

You can’t have a relay that’s too big. A good 40a will most likely do it, but a 60a is the same cost to run (at least it’s damn close)

You can actually find the factory Bosch relays on rock auto. I believe they’re yellow in color. I’ll try and find the link.

Steel1 · Aug 1, 2020

Ok haven't committed much time to this LAZY hot start issue but have been playing around with it a bit lately.
Only seem to have an issue when I drive around to full operating temp and then let car sit and heat soak for
a few hours. If I shut it off and restart within 15-10min. it fires right up.

What I have noticed is if I allow it to heat soak then crank it and just slightly crack the throttle it snaps to life.
Given this info I'm guessing I need to increase cranking pulse and have been but haven't got results yet.
I know I need to datalog the issue but screwed up on my last attempt.
Here's a copy of current tune, any suggestion given the cracking of the throttle remedy ?

a91what · Aug 1, 2020

Try priming the engine twice before you start it, if it fires right off then it needs more fuel. It could need the cranking duty% increased slightly as well.

Steel1 · Aug 1, 2020

a91what said:
Try priming the engine twice before you start it, if it fires right off then it needs more fuel. It could need the cranking duty% increased slightly as well.

Forgot to mention I tried that , didn't help.

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