Hi i am about start a new engine build a vq35 hr.
Looking to make around 750 crank hp on e85 does any one have experience
with injector sizing and injectors to make this power?

 

You will be maxed out at 650ish whp with 1200cc injectors. I am getting a set of 2200cc injectors now. If you don't plan on going any higher than 700 whp then 1600s will be fine

 

Blackbird....what are you using for pumps?

 

what brand injectors?

 

hands down the best big injector out there
http://www.injectordynamics.com/ID2000.html
plus they are already denso, so they just drop in.

be interested to know what you IPW is at idle with your 1200s

Mine idles at 12.5 with an IPW of between 0.018 and .13 (-10 to -9psi at ~800 rpm).

 

Modified CJM Twin pump setup

and im either going with the FIC 2150's of ID 2000's. So far it looks like the ID2000's are going to be the winner

 

and im using Precision 1200s. They may be on sale very soon if anyone is interested

 

U guys must literally see the fuel gauge drop everytime u hit WOT....

 

Which means not even 550 whp with my 1000 cc injectors.

 

I can get about 200 miles to a tank with highway driving and some WOT

 

modified how?

 

Typically a walbro has a pressure bypass at like 75 psi or so, the Evo guys have been modifying the bypass so it can hold higher pressures than 75.

http://www.driven2modify.com/showthread.php?t=11702

 

interesting. I had no problems holding FP at ~85psi (47 base +38psi boost) Wonder what Charles says about that.

 

The Precision 1200s work great, very nice spray pattern at low pulse widths. On E85 and base pressure of 48 psi I have made 1000 RWHP on a 6 cyl. At a normal fuel pressure of 43ish you can get 850 RWHP safely, 900 if you really push them. The car will idle like stock too!!


And the best part is that they are not very expensive... I think like $73 each.

 

I have never seen this. We have run 55 psi of boost on supras with FP hitting 95 with no issues using 3 walbros.

 

are the precisions drop-in plug-n-play?

 

I put them in the stock rails all the time, different electrical connectors though (standard injector type). They are a bit taller than the stock injectors so you can either grind the manifold to clear them, or use the lower manifold spacer that injected sells, or get aftermarket rails. I always use the spacer.

 

i run the CJM fuel rails.

 

The precision 1200's are what Larry just dropped in my motor this week

Tom

 

Fool! you should have went bigger!!