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Sputter and stall after full pull

ghost rider

ghost rider

Suspended
Joined
Nov 13, 2013
Messages
495
Age
65
Location
Muskoka, Ontario, Canada
Country
Canada
Snowmobile
Rxwarrior
LOCATION
Muskoka , Ontario
So ... Newly serviced , new plugs, carbs cleaned, running perfect all day Saturday.
Come Sunday after one full pull @ 9lbs boost my stock engine rx1 (2004) decides to run like crap after every full throttle adventure... To the point of stalling out after back fires and sputters.... Then if it sits dead for 30 seconds it will start up and run... But only if I stay under 5k rpm.... Fast forward 30 minutes and if I go slow for a while then run a full pull all is fine?????? What the hell is going down. FYI cleaned plugs and coils, running klotz hirate
Race gas blend to 100!octane... Running 8-9 lbs boost, may spike to ten. No air leaks, clean filter, running front mount turbo with slp billet carb caps... Yadayada yada.
Why is this happening and how do I get rid of it....... It's very annoying
Thanks for reading any help is appreciated

Barry
 

A couple of initial thoughts:
Does it seem to be running on 3 cylinders after wto? If so:
1. Did you reduce the new plug to .018 (Im guessing this is the issue as your boost may blow out plugs the stock gap)
2. Possible loading with fuel at wot in cylinder(s).
a. Check fuel pressure
b. Carb jets
c. This could also be due to spark plug gap

What are your A/F #s
 
TurboTime said:
A couple of initial thoughts:
Does it seem to be running on 3 cylinders after wto? If so:
1. Did you reduce the new plug to .018 (Im guessing this is the issue as your boost may blow out plugs the stock gap)
2. Possible loading with fuel at wot in cylinder(s).
a. Check fuel pressure
b. Carb jets
c. This could also be due to spark plug gap

What are your A/F #s
Click to expand...

Thanks for the help!
Sort of running on three... Won't rev... Sputtered and pops like crazy.
Will idle fine once it is re started..... Let it sit for a minute or two
And it starts like nothing is wrong.... Until a full pull (wot) for 3 sec or so
Plug gap - 28
Fp - 5-6 ( just had it adjusted at the mod father)
Carbs were cleaned... Stock jets
I was told I didn't really need AFR.... But it seams like the number one question
When trying to diagnose issues.... I think I need one.

Barry
 
Do you have a blow off valve and is it working?
I assume you are talking the warrior with CPR kit?
Try bliping the throttle when letting off.
Sounds like over fueling from boost after throttle chop. If you have no blow off it is the nature of the beast and maybe the plugs are not keeping up. And yes your gap is wide for boost.
 
kviper said:
Do you have a blow off valve and is it working?
I assume you are talking the warrior with CPR kit?
Try bliping the throttle when letting off.
Sounds like over fueling from boost after throttle chop. If you have no blow off it is the nature of the beast and maybe the plugs are not keeping up. And yes your gap is wide for boost.
Click to expand...

thanks for the help…. Yes warrior with CPR.
I have no blow off valve or AFR…..guess i should get both.
Also plug gap will be changed to 18 from 28
thinking of lowering boost to 8 even though i have plenty of octane -96-98 until i get blow off valve.
i did the blip thing and that is when it starts the missing popping cycle…..until it dies.

very weird is that sometimes it runs great…no issues?

Barry
 
Even if the BOV isn't the full problem it will help with fuel milage and drivability, otherwise it just over fuel's every time you get out of the throttle from boost.
A friend had a couple RX-1 CPR Turbo race sled's and they did the same thing and had no BOV's.
 
kviper said:
Even if the BOV isn't the full problem it will help with fuel milage and drivability, otherwise it just over fuel's every time you get out of the throttle from boost.
A friend had a couple RX-1 CPR Turbo race sled's and they did the same thing and had no BOV's.
Click to expand...

thanks kviper…..i appreciate your help!……I always liked the sound of a blow off valve….i had one on a couple tubo cars i owned
hopefully it has the same woosh sound.


Barry
 
Carbs on anything are notoriously rich on decel. Sounds like you're just pig rich during decel, which ends up cooling the plugs down too much, causing the issue. BOV would help for sure, but a vacuum operated valve that opens when you have a vacuum signal behind the carbs would probably do the most good.
Check these out, I've had awesome luck with them.
http://www.synapseengineering.com/
They operate on both boost pressure as well as vacuum signal.
 
Where are you hooked up to get the boost signal for the fuel pressure regulator. It works better if you get that from behind the carbs as it will shut the extra fuel down sooner as you let off the gas. Also get a bov and a good wide band air/fuel gauge on there so you have some idea of what's going on in the engine.


Ken.....
 
nate007 said:
Carbs on anything are notoriously rich on decel. Sounds like you're just pig rich during decel, which ends up cooling the plugs down too much, causing the issue. BOV would help for sure, but a vacuum operated valve that opens when you have a vacuum signal behind the carbs would probably do the most good.
Check these out, I've had awesome luck with them.
http://www.synapseengineering.com/
They operate on both boost pressure as well as vacuum signal.
Click to expand...

Very slick engineering from synapse... They look rather large... Will it fit under the hood?
You can see in my avatar, the pipe that I would use to mount the valve.
Thanks for your help mr bond...

Barry
 
givemeaboost said:
Where are you hooked up to get the boost signal for the fuel pressure regulator. It works better if you get that from behind the carbs as it will shut the extra fuel down sooner as you let off the gas. Also get a bov and a good wide band air/fuel gauge on there so you have some idea of what's going on in the engine.


Ken.....
Click to expand...

Thanks ken, signal is behind the carbs.
Looks like the consensus is BOV and wide band AFR.... 18 gap plugs
Funny that this didn't happen all day on Saturday but only on Sunday?
Maybe I got lucky.
 
TurboTime said:
A couple of initial thoughts:
Does it seem to be running on 3 cylinders after wto? If so:
1. Did you reduce the new plug to .018 (Im guessing this is the issue as your boost may blow out plugs the stock gap)
2. Possible loading with fuel at wot in cylinder(s).
a. Check fuel pressure
b. Carb jets
c. This could also be due to spark plug gap

What are your A/F #s
Click to expand...

OK up-date ….installed a BOV….sounds great but it didn't help.
funny thing is the sled now idles roughish and when i sit on it it runs worse…..then if i shake it it will stall…..wt*
any idea????

New update…blow off valve needed 4 rings taken out before it would evacuate air…..now fixed-thanks for that tip
2) looks like the plugs got pooched from over flooding……installed new plugs gap at 18…beautiful.
2b) will get a wideband AFR on order….i have been recommended to get an AEM.

3) much appreciate the advise it worked fantastic…….The garage smells like race gas and I'm a happy man.

Barry
 
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