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#1 |
![]() Drives: 2019 Camaro 1SS1LE Join Date: Jan 2024
Location: Utah
Posts: 162
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LT4 HPFP vs LT2 Intake Manifold
Has anyone done it? All the threads I've searched dead-end with no follow ups. It seems most throw in the towel and would rather go back to the stock LT1 intake than figure out how to make the LT2 work. I'm currently preparing for my build, will be doing a D1X with a potential for about 750whp. I wanted to run the LT2 Intake Manifold but recently discovered the LT2 doesn't clear the LT4 pump. So here I am.
If it's just a matter of running spacer plates for an additional 1/2" of clearance, why not? Need a modified fuel line feed to the HPFP? Doesn't seem too tricky on paper. One would think if the LT2 manifold is a stout upgrade over the LT1, putting FI to it would yield even better results, so why isn't it popular? Why no aftermarket support? |
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#2 |
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,930
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Pretty sureFolks have clearanced the bottom of the LT2 manifold to make it work. Either way I would just do the BTR trinity. A friend of mine just made 822whp with a P1x @ 14.5psi, Trinity manifold, and a BTR stage 2 cam on E50. For reference, It made 600whp on the same dyno with stock motor, 9psi, and 93 pump gas
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2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
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#3 | |
![]() Drives: 2019 Camaro 1SS1LE Join Date: Jan 2024
Location: Utah
Posts: 162
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Quote:
I talked to GPI this morning, and James claims they have several applications running this combo with no clearance issues. And then GPI went offline, due to lunch hours most likely. I will attempt to make contact with them again, possibly get someone on the phone or aquire any documentation they can provide. Worst case, I may do a mock-up with my shortblock while I have it on the engine stand. It's not near ready for assembly, but perhaps a dry fit is in order. Will have to do it carefully. I really hate getting into an engine build just to get delayed by something I could have prepared for. So here I am, attempting to be prepared with a solution. It's LT2 manifold or back to stock, one way or the other. |
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#4 |
![]() Drives: 2022 Camaro 2SS 1LE Join Date: Nov 2021
Location: NC
Posts: 299
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Here's a picture of the spacers I used when I installed my LT2 intake with the LT4 hpfp. Hit me on PM if you need this setup I'm not using them anymore.
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p1sc1 factory box w/ stage 2 intercooler, Lt4 fueling, JMS BAP, lt2 intake, kooks 1/78 longtube headers w/ h/f cats, alky meth kit, thpsi port injection
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#5 | |
![]() Drives: 2019 Camaro 1SS1LE Join Date: Jan 2024
Location: Utah
Posts: 162
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Quote:
You know what's still nuts, GPI is claiming there's no need for spacers still. |
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#6 | |
![]() Drives: 2022 Camaro 2SS 1LE Join Date: Nov 2021
Location: NC
Posts: 299
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Quote:
__________________
p1sc1 factory box w/ stage 2 intercooler, Lt4 fueling, JMS BAP, lt2 intake, kooks 1/78 longtube headers w/ h/f cats, alky meth kit, thpsi port injection
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#7 | |
![]() Drives: 2019 Camaro 1SS1LE Join Date: Jan 2024
Location: Utah
Posts: 162
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Quote:
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#8 |
![]() Drives: 2022 Camaro 2SS 1LE Join Date: Nov 2021
Location: NC
Posts: 299
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I did have to shave a little bit off the back of the cover for it to fit. I didn't stop using the manifold I just added port injection and the plates for that replaced the need for the spacers.
__________________
p1sc1 factory box w/ stage 2 intercooler, Lt4 fueling, JMS BAP, lt2 intake, kooks 1/78 longtube headers w/ h/f cats, alky meth kit, thpsi port injection
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#9 |
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,930
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I am sure it's softer than a LT2 down low but honestly it feels pretty good. It still made like 680wtq and has no issue lighting off a Toyo R888.
https://youtu.be/f3TDFiw9lqE?si=UziJ9nttxf_bdNZ7 Either way you can make the LT2 fit as I previously mentioned.
__________________
2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
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#10 |
![]() Drives: 98 Camaro Join Date: Apr 2022
Location: MD
Posts: 274
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I went back to the lt1 intake. I just cleaned up the port transitions and cut the tube out of the inlet. When I do engine work I’m gonna switch to a btr or performance designs new intake coming out.
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