How many miles on that spring?
street car gone road race
- Thread starter gotovato
- Start date
- Watchers 44
gotovato
Greenie Member
140,000km or 87,000miles. I don’t think that’s a ton.
But with the track use doesn't seem terrible hat it failed. I wonder how hot the hpfp is getting
phate
Motorhead
Are you having any fueling issues or are you just concerned about how it looks?
The outside of that HPFP piece doesn't do anything except sit there. What does the internal surface look like and what does the piston look like?
Springs don't have infinite life, but I would check the rate of a couple and compare. The OE springs are pretty soft, but they work fine up to any RPM we're seeing. Even at 300°F, you won't see much degradation of elastic modulus vs what we see at say 200°F.
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gotovato
Greenie Member
I’ve been trying to track down a random drop in fuel pressure at wot. I also seem to have a slight lower then expect idle psi. Around 350-380 it bounces around sometimes landing on 420 which I guess is the norm.
fprv has been replaced. Spill valve serviced and cleaned.
I mention the spring thinking if it is getting soft, breaking down over time due to heat maybe that could be contributing to this issue?
last season I had drop in fuel pressure on track at wot. This was thought to be the internals sticking. I cleaned them up and had no issues the rest of the summer. The piston also shows some signs of wear.
with auto techs reply to the pictures I sent them I guess something here is a little off?
gotovato
Greenie Member
I’m also curious how hot it gets. There’s definitely friction in there and when my oil is hot hot, that surely isn’t helping.
when I had my drop in fuel pressure during my cruise the other week it was at the hottest part of the day when my oil had been cooking 250f for hours. Thinking that didn’t help anything.
phate
Motorhead
How long have you been using your current injectors? I've had 2 injectors fail in the last couple years. Starts with a light misfire, random pressure drops, and one was bad enough to leak after shutting it down (thought HPRV due to fuel pressure not climbing after shutdown).
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gotovato
Greenie Member
Injectors have about 1.5k miles on them since cleaning. I would’ve guessed injectors if this was still my stock block but these injectors should be good.
phate
Motorhead
My failed injectors were ones that had been cleaned. My engine hasn't seen more than ~500 miles since the build, ALL are hard miles, just like yours. My car lives in boost and the high revs lol.
They were my last stop both times because I couldn't believe they could be bad in this few of miles...
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They were my last stop both times because I couldn't believe they could be bad in this few of miles...
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gotovato
Greenie Member
Damn. Damn damn damn lol. You make good points and you make me think. It’s possible for sure. When my new hpfp internals arrive I’ll swap them in and we’ll see. If the issues proceed then I think you’re right. I’ll send my other injectors out for cleaning and swap them in. I hope this isn’t the case though lol.
jdab555
Greenie Member
What was the way in which they failed after having just been cleaned? Dis-loged debris, electronics failure?
phate
Motorhead
They went from in my car to in the trash. New injectors went in and the car ran fine.
I would venture to say debris because they have been gradual failures with the injector stuck open. Electronic failure wouldn't hold the valve open when a new injector fixed it.
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phate
Motorhead
Don't forget to check the tiny mesh filters at the injectors and HPFP. Those things degrade over time.
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gotovato
Greenie Member
So the mesh filter at the hpfp I replaced same time the motor went in. About 1.5k miles ago so that’s fresh.
As for my injectors I believe the place that did the cleaning replaced all those internal filters with stainless mesh filters vs the oem plastic.
gotovato
Greenie Member
Did some cruising today after fixing my fuel rail brackets yesterday and installing new hpfp internals. Car is quick. So much fun to drive. Check the vdyno, freaking afr is just a line lol. I Look in the log and it’s just pinned at 11.76. Awesome.
definitely feels great. I’m also impressed with how much grip this car makes. Like you can just be moron stupid through a corner at wot and nope it’s fine just takes it. Clearly I’m not pushing hard enough. Car needs to see the freaking race track desperately. If I drive well, it will be properly quick this season no doubts there.
thought this was a cool comparison. Same road as always. Last years setup vs this years
had to give the car a wash as it’s been a while. I really like the way this thing looks. It’s simple. Clean.
Developed a rear end clunk today. Maybe rear endlinks? I have never replaced the rear endlinks in my 5+ years of ownership of this car. I guess it’s time lol.
definitely feels great. I’m also impressed with how much grip this car makes. Like you can just be moron stupid through a corner at wot and nope it’s fine just takes it. Clearly I’m not pushing hard enough. Car needs to see the freaking race track desperately. If I drive well, it will be properly quick this season no doubts there.
thought this was a cool comparison. Same road as always. Last years setup vs this years
had to give the car a wash as it’s been a while. I really like the way this thing looks. It’s simple. Clean.
Developed a rear end clunk today. Maybe rear endlinks? I have never replaced the rear endlinks in my 5+ years of ownership of this car. I guess it’s time lol.
Wear a diaper the first time you hit the track you are going to shit your pants with the new power curve
gotovato
Greenie Member
LOL.
I’m going to be honest here...I am a little nervous maybe. It’s fucking nasty on the street where I’m just babying it. On the track? It’s going to take some driver recalibration. The power curve is amazing and it contributes to the traction for sure. Dead hooking sweepers and corner exits just flat out wot with a decent bit of steering angle is SO satisfying. It’s going to be wild. I will need more brake pad I think also.
Eyeballing from the graph but you have 50 more horsepower at the old redline and then carry that for what another 1000 rpm? Totally different car
gotovato
Greenie Member
It feels like it. I can rev it all the way out and it just pulls. It’s very very noticeable and it’s a completely different car for sure.
Still haven’t turned PI on lol. Just extend out that torque curve a little more? Mmmmmmm. Can’t wait.
