Quote:
Originally Posted by Megahurtz
Both LPE Big Bore v2 and the XDI 30% injectors claim they support 2900 PSI. I directly asked LPE this question and it was confirmed. I did not ask XDI, but the paperwork that arrived said 2900 PSI is guaranteed to be consistent and 3200 is supported for racing/WOT application. Essentially I interpreted that XDI was saying you can run a higher(3200) PSI but they don't recommend it for consistency on for a street car. I'm assuming due to stuttering perhaps. I know FIC has this issue above 2600psi.
Did your experience find something different?
|
I have run them both at 2900psi, but it's right on the edge of misfire and a stock low side pump with JMS won't keep up. LPE has never said their pump will support 2900psi to me and I have spoken with a couple guys there (I live 30 minutes away). Perhaps they been reading these forums and have read my posts stating it will Lol. They told me it would pop the O ring but it never has. I have had FIC +30 hold 2900psi and some misfire. The XDI +30 will hold 2900 psi but the +65 are 2600 max.
On a SS LT1 P1x pushing 10 psi peak I found 2500 psi worked best and provided the most fuel headroom with this fuel system. It was stable to E70 @ .82 lambda. This setup hits much softer so it doesn't tax the system on the hit.
On a FBO ZL1 with Kong port and 2.17, I needed the high side set low as possible because it wants to bleed the rails on the hit. I actually have to start with a leaner AFR(.87) and blend down .84. It holds E62 fine @ 14psi.
On my SS LT1 Whipple 2.9 setup I started at 2900psi and the high or low side wouldn't keep up. Dropped to 2500 psi, low side was fine high side was still dropping some. Went down to 2175 and both hold steady on E60 @ 10 psi .82 lambda.
Injectors are in the 5.5-5.7ms range on all the above. Commanding more pressure attempts to lower Injector ms down to 5.0-5.2 but soon as the high side starts dropping, they open up to 5.8-5.9
So, it all comes down to finding what works best on a particular combo. A stronger low side would likely help hold higher pressure.