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Old 09-24-2013, 10:30 AM   #1
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fuel injectors

So I'm getting pretty close to full bolt ons and realized that I really need to get something bigger than these stockers. There's a guy with a set of Denso 24lb injectors from a 98 Cobra for sale, would they fit my car? I haven't checked what style I have yet so I know I need to research that.
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Old 09-24-2013, 10:52 AM   #2
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The stock injectors for your engine are 19 lb/h Bosch EV1 body style units with Jetronic/Minitimer style connectors--colour coded orange.

The '98 Cobra injectors are 24 lb/h Bosch EV6 body style units with the USCAR type connector. They will physically fit on your GT however you will need USCAR to Jetronic adapters to connect the wiring.

You will also of course have to have your tune modified to work with the 24 lb/h injectors...
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Old 09-24-2013, 10:56 AM   #3
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Ok that's good to know. I believe i've seen the adapters for sale on Latemodel. Thanks Cliffy!
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Old 09-24-2013, 10:56 AM   #4
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IIRC the orange 19lb injectors were already at 90% duty cycle on a stock 4.6 PI 2V right from the factory. Reason they went to the pink top 21lb injectors in 2001. You could always swap in the 21s and just roll with it as is. You won't need bigger than that until you do a power adder.

You will need a tune for the 24lb injectors or get a "calibrated" MAF. If you have free tunes for life from Bama get ahold of them before you order anything and see if they tune for fuel injectors. I really don't see why they wouldn't be able to.
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Old 09-24-2013, 11:07 AM   #5
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Please do NOT get a "calibrated" MAF, they are a kludge left over from 25 years ago, and suck too--here is why.

If you do get one then make sure you hang on to the transfer function document that comes with it so that when you do get a real tune you will be able to find a tuner willing to do it; or be prepared to spend another $200 to $300 for them to map out the MAF's output curve.

But mostly just do things the modern way and have the tune modified for the new injectors--even if you go with the pink 21 lb/h units just let BAMA know what you have and they can take care of it...
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SOLD! - 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum, Delta Force tuned,
Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 09-24-2013, 11:09 AM   #6
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Lol that is why I said "calibrated". I do not recommend it which I probably should have mentioned. Its just a hack that can cause issues although it didn't for me when I had one before I knew any better back in the day.
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Old 09-24-2013, 11:22 AM   #7
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I cringe at the phrase, and have actually refused to tune engines when one was installed and the owner did not have the transfer function document.

Pro-M provides a 9-point curve with their calibrated MAFs, it can be blown out to the 30-points needed for the EECV with a linear regression model.
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SOLD! - 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum, Delta Force tuned,
Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 09-24-2013, 11:27 AM   #8
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I was planning on getting an updated tune from Bama. If they won't tune for it then I'll just strap it on a dyno and get a custom one.
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Old 09-24-2013, 08:56 PM   #9
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Well I just got the injectors and a free fuel pump (I'm not 100% sure it will work with my car) but i'm assuming install is as easy as popping the old ones out and putting the new ones in?
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Old 09-24-2013, 08:58 PM   #10
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yup, soak them in gas tho so they seal properly and you wont get leaks
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