Fuel-It TBI or CP-e PI? What's the difference?

Shadow007 · 12-04-2015, 04:44 PM

What's going on everybody? I have a few questions regarding the best route to take in relations to using full e85 and maxing out the whip to its full potential. So I've recently jumped the gun and bought VRSF inlets, which should arrive next week, and out of the performance mods I do have I'm at the point now where it's like eff it, what's one more mod. So I've been looking at the CP-e Port Injection kit and Fuel-it Throttle Body Injection, but I'm not sure which route to go. From my understanding and I'm quite sure I may be wrong, but oh well. Is PI upgraded lpfp and hpfp option and the TBI is just an upgraded hpfp option or am I way off? I have a lpfp and I didn't know if PI was worth when I could do the TBI and get the same results.

12-04-2015, 04:49 PM

wat?

bokyo1987 · 12-04-2015, 06:30 PM

Your LPFP and HPFP are both separate from TBI/PI and what LPFP upgrade you need depends on how much fuel you need. Stock turbos, a LPFP upgrade like Fuel-It's Stage 2 (Walbro 450) should suffice. While Fuel-It's Stage 3 (dual Walbro 450) is needed when pushing upgraded turbos.

PI adds six extra injectors on a fuel rail and will allow you to run straight e85 with upgraded turbos. TBI adds a spacer with nozzle(s?) right by the throttle-body and should allow you to max out the stock turbos running straight e85.

Both PI and TBI were developed because the HPFP can't keep up and there aren't any upgrades for it.

csu87 · 12-05-2015, 09:21 AM

Tbi for stock turbos, pi for everything else.

NA55 · 12-05-2015, 11:19 AM

Quote:

Originally Posted by bokyo1987

Your LPFP and HPFP are both separate from TBI/PI and what LPFP upgrade you need depends on how much fuel you need. Stock turbos, a LPFP upgrade like Fuel-It's Stage 2 (Walbro 450) should suffice. While Fuel-It's Stage 3 (dual Walbro 450) is needed when pushing upgraded turbos.

PI adds six extra injectors on a fuel rail and will allow you to run straight e85 with upgraded turbos. TBI adds a spacer with nozzle(s?) right by the throttle-body and should allow you to max out the stock turbos running straight e85.

Both PI and TBI were developed because the HPFP can't keep up and there aren't any upgrades for it.

Good explanation..

MachWon · 12-05-2015, 11:49 AM

Do you need a different/special charge pipe for TBI? Seems like fitment would be off with a spacer on the TB.

12-04-2015, 04:44 PM	#1
Shadow007 Captain 67 Rep 605 Posts Drives: 2009 335i coupe monaco blue Join Date: Apr 2012 Location: El Paso, TX iTrader: (2)	Fuel-It TBI or CP-e PI? What's the difference? What's going on everybody? I have a few questions regarding the best route to take in relations to using full e85 and maxing out the whip to its full potential. So I've recently jumped the gun and bought VRSF inlets, which should arrive next week, and out of the performance mods I do have I'm at the point now where it's like eff it, what's one more mod. So I've been looking at the CP-e Port Injection kit and Fuel-it Throttle Body Injection, but I'm not sure which route to go. From my understanding and I'm quite sure I may be wrong, but oh well. Is PI upgraded lpfp and hpfp option and the TBI is just an upgraded hpfp option or am I way off? I have a lpfp and I didn't know if PI was worth when I could do the TBI and get the same results. __________________ F90 M5 Comp/ FI Exhaust, MAD pdownpipes / PG Intakes/ H&R Springs/ AG wheels E85 Z4M Last edited by Shadow007; 12-04-2015 at 06:08 PM..
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12-04-2015, 04:49 PM	#2
FCobra94 Guest 0 Rep n/a Posts Drives:	wat?
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12-04-2015, 06:30 PM	#3
bokyo1987 Asleep 53 Rep 298 Posts Drives: 2009 Camry Join Date: Jan 2014 Location: Augusta, GA iTrader: (1)	Your LPFP and HPFP are both separate from TBI/PI and what LPFP upgrade you need depends on how much fuel you need. Stock turbos, a LPFP upgrade like Fuel-It's Stage 2 (Walbro 450) should suffice. While Fuel-It's Stage 3 (dual Walbro 450) is needed when pushing upgraded turbos. PI adds six extra injectors on a fuel rail and will allow you to run straight e85 with upgraded turbos. TBI adds a spacer with nozzle(s?) right by the throttle-body and should allow you to max out the stock turbos running straight e85. Both PI and TBI were developed because the HPFP can't keep up and there aren't any upgrades for it. __________________ 2007 C6 Corvette... VaraRam intake, FAST 92 IM, AI ported stock heads, Cam Motion cam, TSP headers/x-pipe, Borla S-Types, C6Z differential - 425whp 2008 135i... VTT S2+, MOTIV PI, FBO - 582whp (sold) 1999 C5 Corvette... Blackwing intake, C5Z titanium exhaust - 344whp (sold) Others sold: W204 C350, E90 330i, W-body Monte Carlo SS, etc.
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12-05-2015, 09:21 AM	#4
csu87 Banned 2130 Rep 3,553 Posts Drives: 09 335xi Join Date: Nov 2013 Location: Northern Colorado iTrader: (0)	Tbi for stock turbos, pi for everything else.
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12-05-2015, 11:49 AM	#6
MachWon Private First Class 25 Rep 197 Posts Drives: 2007 335i 6mt. JB4 + CDP's. Join Date: Mar 2015 Location: . iTrader: (0)	Do you need a different/special charge pipe for TBI? Seems like fitment would be off with a spacer on the TB.
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