Need help w/ injector sizes...

[my98gsx]

I am finishing up my rebuild for the new race season, last year i ran with an evoIII 16G on a stock block. (I used 650cc injectors) This year i did a huge rebuild containing:
2.3 stroker kit
272 cams
Crowler valves, springs, ret
Weisco 9:1 pistons
Eagle 100mm crank
Gm mass air with translaor
57trim turbo
ported head/valve job
(theres more but thats the main parts)
My question is are my 650's big enough? Victor research said go with 880cc's.... Slowboy had mixed opinions. One said the 650's were fine, but the next day somone else said that i should have atleast 850's... Does anyone have any idea on what size injectors i should put in? - im not worried about the money, i want to be able to build as much power possible off of my setup- so if the 650's will max out, then i will go bigger. -thanks-

 

[JohnCIV_Talon]

Well it depends on what you are tuning with, Safc is only good for 650's and that wouldnt be a very good tune. If you had dsmlink or a keydiver chip you can run upwards of 1000cc injectors without any big issues. As far as the cost 650's to 850's will only be about 20 bucks more. Somewhere around 280 I believe for 850's.(that would be on average) In you case you have a stroker engine and I would defiantly go with the 850's minimum for your bigger turbo to have its full potential.

 

[daren_p]

Like was said all depends on your tunning method. With DSMLink you can pretty much run whatever size you want so go big so you won't need to upgrade in the future. With a piggyback system your limited to about 650 because of the fuel you need to pull advance your timing to much with larger injectors. You can lower your base FP if you have an adjustable FPR to help out but if you want to stick to a piggy back setup, the best method would be to get an eprom chip burned to compensate for the injectors & just use the piggyback for fine tuning. As for what size your setup will require, I would say you'll probably max those 650's out without to much trouble. Depending on what boost your running but I already see 85% IDC on my 750's @ around 22 psi & my turbo will be in the same ballpark as you, plus your stroker is going to love the airflow even more.

 

[my98gsx]

The only means of tuning i have is the MAF translator, an AFC, and an adj. FPR....

 

[JohnCIV_Talon]

Well unless you get dsmlink or a keydiver chip, I wouldn't recommend going higher then 650's.

 

[daren_p]

Well if you don't want to upgrade to DSMLink (ask any owner its defently worth the cost), your still going to have to pick up an eprom ecu & eprom chip burned for your injector size as 650's won't cut it if you plan on using that setup to its potential.

 

[zippyshoe]

Here is one source for socketed EPROM ECU's that I have had good experience with: http://www.ffwdconnection.com/electronix.shtml. If you scroll down toward the bottom of the page, you will see these products. I think daren_p summed it up well stating that to max-out that turbo set-up, you will need more fuel than what those 650's can deliver.