Need advice about which injectors

[GimPin]

my next upgrade is going to be injectors but I have a delima I dont know wheather to get 550s or 660s I am running 9.5:1 compression curently running 10 lbs planing to turn it up to 15 street and low 20s track on race gas are 550s enough are 660s over kill also buying an safc with it ... I like the prices of the 550s but want to make sure they are going to be sufficient ...... please advise

[XakEp]

If you dont plan on getting any bigger than a 16G then the 550s will be fine... Otherwise get the 660s with an AFC.

[GimPin]

I am planing on upgrading turbo would like to go to a t3/t4 by the end of next year the 16g was on the car when I bought it so it is just the turbo I am going to use till I can afford something bigger

[GimPin]

and will the s-afc compensate enough for the 660s so that I will not run rich tell me if i am wrong but the afc falsifies (sp) the MAF reading by 10% each direction am I going to have so much fuel that I will be running rich all the time

[hoffman]

set the car up for how it is now. there are atleast 5 different t3/t4 setups i can think of off my head. some would use 550s some would use 660s. so just get the car running the way you like it now. or leave it alone so you can start stocking up on all the parts you need to upgrade for the new turbo.

[GimPin]

the car is running but I am only running 10 lbs becuase I dont want to turn up the boost with out the supporting injectors I am only running 10 lbs because of the high compression with the injectors I am going to go to 15lbs I am planning on working towards the t3/t4 this winter but the 16g will be just fine till then

[hoffman]

have you datalogged the car? you could be running rich an don't even know it.

[GimPin]

no I have not I need to get one but I dont have the extra $200 to spend on one right now I have a little over $600 to spend and injectors and an afc seem to be the best bet

[Van]

t3/t4, hehe. you really need to figure out which one of literally hundreds of t3/t4 combos you can make. We can go from big enough for 9's in a Cadillac to small enough for honduh's.

Then see if that's gonna fit your goal and budget. Think about that HP, MPH and ET goal seriously and whether you want a rollcage in your car or not.

IMHO, $600 for stuff without a $200 datalogger that'll actually let you tune her correctly AND self-diagnose many dsm issues is putting the cart before the horse...
IE: You are only running 10 psi because you don't have a datalogger to show you what you're gonna NEED to know with a s-afc and big injectors.

Back to the injectors, 550's have run mighty quick on race gas and up here in our thin air are even better.
Now if you wanna run 25 psi, on '91 octane pump gas and run 12's every day of the week on the street, then get some 650's. Not 660's, 650's.
With some real good race gas and only a 20g'ish turbo and a stock ecu, you may have issues leaning her out enough with 650's or larger. Every % point counts.

Also if you go with the larger injectors, then IMHO a good AFPR now becomes mandatory. Being able to "dial in" one's IPW at high boost and 7k rpm is a very nice thing. With the 550's you could use a cheap B&M fpr and raise your base fp to keep your IPW decent. IE: On one of my best runs, with 650's and C14 race fuel my IPW was 14.5 ms at 7000 rpm on top of third gear. That's 85% DC. The 1G ECU's seem to like that.

[GimPin]

Cool thanks for the advice it was all very help full I will probably buy the 550s and if they are not enough will get a FPR not sure what t3/t4 setup I will do I havn't put much thought into it that is a ways off