Does anyone know what size pink top injectors are?
pink and orange on GT's on my 98 cobra they are like a pinkish redish color
From my previous post: The pink (lavender) injectors are 21 lb/h, they were used in the 2V engines from late 2002 through 2004.
You will absolutely need a tune to run the 24 lb/h injectors--otherwise the engine will run quite rich.So could I change to #24's? Do I need a tune for them? Will mine run better with em?
This may be more than anyone wants to know, nonetheless:
Some further info regarding Ford's change from the 19 lb/h (orange) to the 21 lb/h (pink) injectors.
In 1999 Ford ran into issue with the production Cobra's not producing the claimed 320 fwHP, some reportedly down by as much as 30 HP. They halted 1999 MY production and there was no 2000 MY Cobra in the US. This was a real "black-eye" for Ford and they began a lengthy review of their claims for all engines. In this review it was found that the 19 lb/h injectors in the 2V engine (same as used with the 225 fwHP non-PI engines) were only marginally capable of supporting the PI engine's claimed 260 fwHP. The 21 lb/h injectors were quietly introduced into the late 2002 MY production.
To support 260 fwHP 19 lb/h injectors have to run at a 85 to 90% duty cycle, I.e. near flat out, higher than is desirable. The 21 lb/h units only need to run at 80%, a rule of thumb design limit. This is why the New-Edge GTs with the pink injectors, dead stock, will delivery 3-5 rwHP more on a dyno--usually coming in around 220 rwHP versus 215 to 218 for the 19 lb/h equipped engines.
It is also why they respond better to a custom tune. When Ford changed to the larger injectors they did not change the injector parameters (low and high slopes) in the tune.
Here are the injector scalars from a 2000 RVAFA.NUX2 tune:
and from a 2003 RYAF1.XSH2 tune:
Note that the low and high slope values are the same, even though the 2000 came with 19 lh/h injectors and the 2003 with 21 lb/h units. This is why the late 2002 through 2004 GTs run absolutely PIG rich at higher loads and WOT; the AFR on mine would dip into the high 10s (10.8:1) on hard acceleration and fall on it's face.
I corrected this by changing the slopes as shown below, gaining 16 peak rwHP (220 to 236) on a dead stock engine with no other changes (except dumping the silly CAI the PO had installed¹):
My last mod, because I had modded/tuned my way to 252 rwHP, was to install FRPP 24 lb/h injectors (the 21s were running 88% duty cycle)--using these tune parameters:
This and some further tweaking gained another 10 rwHP, to 262/305 rwHP/lb-ft...
¹ - The previous owner of my '03 had installed a silly cheap "fenderwell" CAI, fortunately he had saved the stock airbox and tube which are as good as or better than any after market intake.