Upgrading Injectors

**ls1camino** · 07-30-2008, 06:04 AM

I'm planning on getting the Stage 3 Trickflow Head & Cam Package (515hp/485tq)...I was wondering, do I need to upgrade my injectors to reflect the ported heads and bigger cam?

**shady milkman** · 07-30-2008, 06:10 AM

Originally Posted by ls1camino

I'm planning on getting the Stage 3 Trickflow Head & Cam Package (515hp/485tq)...I was wondering, do I need to upgrade my injectors to reflect the ported heads and bigger cam?

what are you running? i am no injector king but to my understanding there is no reason to not upgrade your injectors..as long as you tune it for them (maybe) hmmm sorry i am no help...but you should upgrade your injectors..that is my opinion

**BDowning** · 07-30-2008, 06:23 AM

Originally Posted by ls1camino

I'm planning on getting the Stage 3 Trickflow Head & Cam Package (515hp/485tq)...I was wondering, do I need to upgrade my injectors to reflect the ported heads and bigger cam?

I just did a cam and I need to upgrade mine....at the dyno the stock injectors were at 100% @ 5000RPM

Bill

**98formy** · 07-30-2008, 08:47 AM

With that package, I would invest in some 42# injectors for sure, I did.

**UTVols98** · 07-30-2008, 12:24 PM

You can get away with the 30# with that set-up. 36# will be ideal. Run 42# if you plan on any more upgrades or power adders.

**ls1camino** · 07-30-2008, 12:54 PM

Originally Posted by UTVols98

You can get away with the 30# with that set-up. 36# will be ideal. Run 42# if you plan on any more upgrades or power adders.

I'm doing full bolt-ons, H/C/I, and I already have headers, but I'm not doing Nitrous or Forced Induction, so 36# would be ideal for this?

**UTVols98** · 07-30-2008, 01:10 PM

Yep. Should be around 85-90% duty cycle with those. The numbers trick flow gives you are flywheel horsepower. I'm around 540 flywheel with 42lb. and still have enough to spray. 36 will be perfect.

**Khaotic** · 07-30-2008, 03:30 PM

(0.6)m/hp-hr) (400hp)/(8injectors) =30#hr
(500hp)/(8injectors) =37.5#hr
(550hp)/(8injectors) =41.25#hr

Also you want to keep a 20% safety margin and allow for losses as drivline and accessories. Also dont forget pressure affect on injector flow rate. Find out what that injector rating is, at what pressuse is it a 30# hr with 48 psi or 58 psi and then do your math for sizing. Thats just what I do.

**666ws6** · 07-30-2008, 06:15 PM

Question: Can you tell if your injectors are maxed through EFILive? I'm just under 400 rwhp, so at the engine is more. Wondering if new injectors would be needed. Whould I have to retune?

**01ws6er** · 07-30-2008, 08:43 PM

Originally Posted by ls1camino

I'm planning on getting the Stage 3 Trickflow Head & Cam Package (515hp/485tq)...I was wondering, do I need to upgrade my injectors to reflect the ported heads and bigger cam?

say bye bye to yet anther 10 bolt lol

**ls1camino** · 07-30-2008, 09:04 PM

Originally Posted by 01ws6er

say bye bye to yet anther 10 bolt lol

lol...nah, I'm doing everything at once...H/C/I, Supporting Bolt-ons, Rebuilt Tranny, New Clutch, Aluminum Flywheel, Carbon Fiber Driveshaft, Moser 9"

She'll be bullet proof...I'm just waiting to start my new job, so I can get a better cash flow coming in

**shady milkman** · 07-31-2008, 04:22 AM

Originally Posted by ls1camino

lol...nah, I'm doing everything at once...H/C/I, Supporting Bolt-ons, Rebuilt Tranny, New Clutch, Aluminum Flywheel, Carbon Fiber Driveshaft, Moser 9"

She'll be bullet proof...I'm just waiting to start my new job, so I can get a better cash flow coming in

aluminum flywheel huh...just watch out for warping

**ls1camino** · 07-31-2008, 06:15 AM

Originally Posted by shady milkman

aluminum flywheel huh...just watch out for warping

Do they really warp that bad? Is it worth risking it for the weight saved over a steel flywheel?

rapter34 · 07-31-2008, 06:50 AM

Originally Posted by ls1camino

lol...nah, I'm doing everything at once...H/C/I, Supporting Bolt-ons, Rebuilt Tranny, New Clutch, Aluminum Flywheel, Carbon Fiber Driveshaft, Moser 9"

She'll be bullet proof...I'm just waiting to start my new job, so I can get a better cash flow coming in

I would get a steel flywheel. weighs a little more but If you want it to be bullet proof.

**konigandy6** · 07-31-2008, 07:50 AM

Originally Posted by 666ws6

Question: Can you tell if your injectors are maxed through EFILive? I'm just under 400 rwhp, so at the engine is more. Wondering if new injectors would be needed. Whould I have to retune?

Bump - Same situation.

**shady milkman** · 07-31-2008, 07:54 AM

Originally Posted by ls1camino

Do they really warp that bad? Is it worth risking it for the weight saved over a steel flywheel?

why take the risk..if your running serious power go billet steel...

**9t8z28** · 09-22-2008, 06:28 PM

Ahh!

I am going with a set of Trickflow 215s too!

**Hawaiianz28** · 09-25-2008, 02:38 PM

i just got the TFH set up on my 383 build... they look pretty.....hey what can i say shiny things are awsome...neways.. im upgrading my FI and also my Fuel rails and pump...

**Bouvers** · 09-28-2008, 08:32 PM

Originally Posted by UTVols98

Yep. Should be around 85-90% duty cycle with those. The numbers trick flow gives you are flywheel horsepower. I'm around 540 flywheel with 42lb. and still have enough to spray. 36 will be perfect.

I'm no expert but I've only ever heard people say 85% duty cycle max and thats not necesarily ideal... I would 80% ideal...

my vote would go for some 42#s I don't think you can get 36# well atleast not SVO's

and you don't want to go too large with injectors because it causes problems for tuning...

just my .02$

**UTVols98** · 09-29-2008, 12:19 AM

Originally Posted by Bouvers

I'm no expert but I've only ever heard people say 85% duty cycle max and thats not necesarily ideal... I would 80% ideal...

my vote would go for some 42#s I don't think you can get 36# well atleast not SVO's

and you don't want to go too large with injectors because it causes problems for tuning...

just my .02$

My bad, I meant 38# injectors. And you don't want to go above 90.
80-85 right up at the top of the range where you'll be ok.