Need Helping Sizing Injectors

[rons69camaro]

I'm building a LS390 from a LQ9 block with twin turbos. My goal is to have ~850 hp with Holley's EFI system and use the car for AutoX. The different calculators I've found are estimating my injector need to be ~65 lb/hr - 85 lb/hr. Looking at similar builds, it looks like people are using all the way from the low side to way bigger. Does anyone have any suggestions as to what size to use or even what brand? I'm also looking for a fuel regulator to adjust off of the boost pressure if anyone has any advice.

[mikels]

Originally Posted by rons69camaro

I'm building a LS390 from a LQ9 block with twin turbos. My goal is to have ~850 hp with Holley's EFI system and use the car for AutoX. The different calculators I've found are estimating my injector need to be ~65 lb/hr - 85 lb/hr. Looking at similar builds, it looks like people are using all the way from the low side to way bigger. Does anyone have any suggestions as to what size to use or even what brand? I'm also looking for a fuel regulator to adjust off of the boost pressure if anyone has any advice.

Cannot go wrong with Injector Dynamics www.injectordynamics.com By far the best high-flow injectors I've used (and I've tried them all).

They also have full calculator on site for sizing that works quite well

I'd still run a return-less fixed pressure system using Vaporworx control system www.vaporworx.com For that power level, can run dual pumps (maybe TI-267's) staged with boost.

Dave

[will69camaro]

I have a friend with a couple sets of ID1000 for sale. He has dual injector setup on a big power car and just went to 16 ID1300s. One set is COMPLETELY new, the other has just some dyno time on them and pump 93 through them only.

PM me if you want price/more info.

William

[71RS/SS396]

85 lb/hr should be the correct size for your power level with boost, 65 lb/hr would be correct for a 850 hp na engine.

[CarlC]

Originally Posted by mikels

Cannot go wrong with Injector Dynamics www.injectordynamics.com By far the best high-flow injectors I've used (and I've tried them all).

They also have full calculator on site for sizing that works quite well

I'd still run a return-less fixed pressure system using Vaporworx control system www.vaporworx.com For that power level, can run dual pumps (maybe TI-267's) staged with boost.

Dave

This, in all respects. The ID's are great parts.

The VaporWorx returnless controller can work in either fixed or manifold referenced fuel pressure modes.