Snyper

iTrader: (27)

I have a set of 60lbs injectors in my 434ci stroker and I think they are too much injector. I want to sell these and run STOCK LS7 42lbs injectors. Will the LS7 injectors support about 550whp NA and will they swap right in place of my current injectors? I have FIC 60s. My car made 548whp on motor and Im not looking to push these injectors past 90% DC.

Exidous

iTrader: (11)

My LS3 injectors(same as the LS7's) are at about 62% with 420whp. You may be okay but it will be close. Physically they are very short. A good inch shorter have LS1 injectors and 1/2in shorter than the LS2 injectors.

Are yours these ones? http://fuelinjectorconnection.com/sh...?productid=189 If so the LS7's will be shorter.

Snyper

iTrader: (27)

No I have the LS2 style.

Grr

iTrader: (2)

why on earth would you do that?
absolutely positively 0 reason to take out the 60's, you will see no difference in anything whatsoever

Exidous

iTrader: (11)

I'd have to agree that a 60lb isn't so big that it would cause drivability issues at all. But if you still want to use the LS3 injector then a little modification my be necessary as the LS3(same as LS7) injectors are shorter still than the LS2 style. By about 1/2". What kind of intake and injector rail are you running? Are there spacers? (between the rail and intake)

At the very least you can run the injector spacers that run on the TOP of the injector. FIC makes them for about 9$ each. I use them just fine since my fuel rail is a stock LS2 on a FAST 102 intake.

Snyper

iTrader: (27)

Had they of been the correct size and just swapped in, A: they would save me a few hundred $ to put elsewhere and B: id be able to use the factory offsets that I know are 100% accurate....not to mention they would work a little better for drivability since they are smaller..

crazymofo1986

iTrader: (3)

a good tuner will make those 60s work great, rather be over sized then not big enough

Snyper

iTrader: (27)

They do work great. Thanks for all the replies.

LSxPwrDZ

iTrader: (4)

I would def swap them. Re-drilled injectors (if thats what your FIC 60's are) are about horrible compared to an OEM untampered injector.

I have tuned a few LS7's with H/C/I that retained the factory injectors and are doing fine. Hard to compare dyno numbers but the highest NA v8 thats been on my dyno dynamics is 526rwhp LS7 and it's running stock injectors still but does have a nice stealth 340 pump.

Snyper

iTrader: (27)

What was the IDC? Im running twin 255s so I know that I have MORE than enough fuel and im also running a full return fuel system with an aeromotive 13101 regulator.



Im running a Fast 102 with LS2 fuel rails. Im sure I could switch to LS7 rails if need be. Are the LS2 EV14 connectors the same as the LS7 connectors?

Snyper

iTrader: (27)

So any word on if these will 100% work for 550whp? I can just buy LS7 fast rails and sell my LS2 fast rails and injectors...

Exidous

iTrader: (11)

Does your LS2 rail have spacers between the rail and intake? If so, removing those will fix the height issue with the LS7's. I honestly think you'll be okay as long as you aren't over 550whp.

The LS7's are the EV6/USCAR connector I believe. Same as the LS2's

LS2 injector height 2.08"
LS3/7 height 1.48"

There was also a difference in o-ring size between the LS1 and later injectors. All LS2 and later should be the same.

LSxPwrDZ

iTrader: (4)

This particular LS7 was running ~90% I believe. I'll have to look at the datalogs again to verify however. This was spinning the motor to 7200rpm as well.

Another question is what dyno have you made 54xhp on? To date there still hasn't been a NA setup break over 526rwhp on ours.

Snyper

iTrader: (27)

My engine is a 434ci ERL ls2 with tfs245s. Running the second pump because I'm running a twin stage wet kit.

LSxPwrDZ

iTrader: (4)

I bet that's a stout combo! I'd like the think you are using as much airflow or more than the LS7 I describe. This particular LS7 was still 427 cubes with WCCH st2 LS7 heads with a port matched 102 and 2" headers. It def makes some steam trapping as high as 141mph NA in a C6Z. I believe you will still be fine with the LS7 injectors mainly because in NA form there is so much more headroom with the leaner fuel mixtures. When you start running richer mixtures is where your duty cycle starts going out the roof.

Snyper

iTrader: (27)

If anyone has any LS7 injectors they want to trade+cash for my FIC LS2 60s let me know.

ctd

iTrader: (1)

I'm looking to go ZR1 injector, I'm currently @ a 38-40% with ID 1000. Many have commented there is no additional power to be gained by increasing the IDC. I thought the LS7 might be a tad small for my combination.

In for the experiment, my used ZR1 injectors are in my hand. Just need rail to injector's adapters & electrical adapters for my LS1.

I also agree with Snyper's comment & data, GM is readily available. I tried some of the other brands & had a terrible time with low speed.... over-killed it with ID's.

Slowhawk

iTrader: (12)

550 is pushing it on LS7's. The FIC 60's tune in just fine.I've run 96lbers NA with no drivability issue's.
Your problem is probly the tuning itself for the engine combo.Dialing in the VE should square it away.

Snyper

iTrader: (27)

The VE and tune is dialed in perfectly. I spent a week tuning VE. I'm trying to save some money by stepping down to the LS7s. I don't need all of this injector.

Slowhawk

iTrader: (12)

If you had 90's I would agree but those injectors are not big for your setup. We always recommend 60's on 427+ CI cars.