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LT4 HPFP added to LT1 w SC for ~40 hp gain :)

Old 10-19-2018, 12:22 AM
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ricmalaz
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Default LT4 HPFP added to LT1 w SC for ~40 hp gain :)


Self installed an LT4 HPFP. Got it for $615 on rockauto.com. I had Cordes Performance Racing update my tune and got an additional 38 rwhp and 39 ft-lb of wheel torque. Totally happy with that!

Thanks CPR and thanks Nick!

2016 Z51
A&A V3 Si with 3.8 inch pulley
Alky Meth injection single nozzle
Flex Fuel tuned at E64 (that's all there was)
LT4 HPFP

This is one fun car!
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Old 10-19-2018, 08:13 PM
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Nice upgrade! Unfortunately the LT1 HPFP runs out of steam *very* quickly on a boosted motor, and even more so on E85.
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Old 12-04-2018, 03:10 PM
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I wonder how much more power if you do the LT4 high flow injectors as well 🤔
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Old 12-04-2018, 07:52 PM
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BlueDevilZ51
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No other mods, just the hpfp and tune added 40whp?
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Old 12-04-2018, 07:59 PM
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ricmalaz
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Originally Posted by BlueDevilZ51 View Post
No other mods, just the hpfp and tune added 40whp?
Yes, BUT, my setup was fuel limited by the LT1 HPFP. So adding the LT4 HPFP just allowed me to get more fuel to get more power out of my setup.
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Old 12-04-2018, 08:04 PM
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Okay, that makes sense. I've always heard the LT1 is limited to around 630whp by its stock fuel system.
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Old 12-04-2018, 09:54 PM
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Originally Posted by ricmalaz View Post
Yes, BUT, my setup was fuel limited by the LT1 HPFP. So adding the LT4 HPFP just allowed me to get more fuel to get more power out of my setup.
No injectors ?
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Old 12-04-2018, 10:32 PM
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Originally Posted by BrunoTheMellow View Post
No injectors ?
Nope. Still the LT1 injectors.
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Old 12-05-2018, 08:56 AM
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Originally Posted by ricmalaz View Post

Self installed an LT4 HPFP.
638hp! Excellent! Congrats!!

How difficult was the install, and what all was involved in putting it in?



.
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Old 12-05-2018, 10:34 AM
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Why not spray more meth ?
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Old 12-05-2018, 10:58 AM
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Originally Posted by 123sugey View Post
Why not spray more meth ?
I'll have to check with my tuner about that.
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Old 12-05-2018, 11:00 AM
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robert miller
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Originally Posted by 123sugey View Post
Why not spray more meth ?
I agree I am going with a ported MSD intake from Mamo, Then now I am sending that out to [email protected] in CA to have them drill out all 8 holes & install there set up into them. So now when I go into boost all 8 holes will be getting good meth. Not a bad price at all for all the work this way I know the system will be correct...Robert
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Old 12-05-2018, 11:37 AM
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HotRodWebb
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Originally Posted by ricmalaz View Post

Self installed an LT4 HPFP. Got it for $615 on rockauto.com. I had Cordes Performance Racing update my tune and got an additional 38 rwhp and 39 ft-lb of wheel torque. Totally happy with that!

Thanks CPR and thanks Nick!

2016 Z51
A&A V3 Si with 3.8 inch pulley
Alky Meth injection single nozzle
Flex Fuel tuned at E64 (that's all there was)
LT4 HPFP

This is one fun car!

Nice results! However, I would think that if the gains were fuel related then they would only have shown up on the higher rpm and horsepower end of the graph where the stock pump was running out of fuel. The stock fuel pump should have been sufficient at the lower rpm/hp levels. The gap does increase linear but almost all stock vs tuned dyno results do this too. I assume due to percentage increases. Maybe it was just a superior tune? Either way that is good power.
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Old 12-05-2018, 11:51 AM
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Originally Posted by HotRodWebb View Post
Nice results! However, I would think that if the gains were fuel related then they would only have shown up on the higher rpm and horsepower end of the graph where the stock pump was running out of fuel. The stock fuel pump should have been sufficient at the lower rpm/hp levels. The gap does increase linear but almost all stock vs tuned dyno results do this too. I assume due to percentage increases. Maybe it was just a superior tune? Either way that is good power.
I was thinking the same thing here but wasn't going to say it. Agree also on the rwhp # on the unit.. Robert
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Old 12-05-2018, 12:36 PM
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Originally Posted by HotRodWebb View Post
Nice results! However, I would think that if the gains were fuel related then they would only have shown up on the higher rpm and horsepower end of the graph where the stock pump was running out of fuel. The stock fuel pump should have been sufficient at the lower rpm/hp levels. The gap does increase linear but almost all stock vs tuned dyno results do this too. I assume due to percentage increases. Maybe it was just a superior tune? Either way that is good power.

correct he has a higher ethanol %
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Old 12-05-2018, 12:49 PM
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Tuner was probably just running it real safe across the board knowing it would starve up top so that the car didn't fall flat on it's face up top and lean out.
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Old 12-05-2018, 10:51 PM
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Joe Cordes is top notch
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Old 12-06-2018, 06:47 PM
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Originally Posted by Fast6.3 View Post
Joe Cordes is top notch
thank you sir!
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Old 12-06-2018, 08:00 PM
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Originally Posted by Fast6.3 View Post
Joe Cordes is top notch
Definitely!

Hey Joe - can you address 123sugey's question earlier in this thread asking why not more meth?
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Old 12-06-2018, 10:10 PM
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Originally Posted by ricmalaz View Post
Definitely!

Hey Joe - can you address 123sugey's question earlier in this thread asking why not more meth?
Iím not on Joeís level, but Iíll chime in anyway.

Im not a fan of fully relying on meth for big power. If you run out or your meth system malfunctions, kiss your engine goodbye in that scenario. An OEM-style HPFP will be way more reliable than a meth pump every single time. In my experience, replacing a meth pump every year or two is not uncommon. I donít mind meth for some extra cooling and a little extra fuel, but fully relying on it every time you boost is not a great idea in my humble opinion.
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