I have been road racing my 97 camaro for 14 years and am now retiring it and putting it back to street duty. When racing it was a 355, stock heads, big cam, made 360RWHP on the stock injectors. I rebuilding it and needed a new crank so I decided to stroke it. It will be the exact same engine otherwise. Going to 383 usually adds about 40hp, so 400RWP accounting for 12% driveline loss (manual) comes out at about 450crank HP. I used 5 different online fuel injector calculators and they averaged out at 31 lbs/hr for my needs at 90% duty cycle. (35lb for 80%). Seeing that Im just going to bombing back roads once in a great while with this thing from now on is 30lb enough or do I need to go higher? Also Summit only lists Accel and Trick flow, I heard bad things about trick flow. Any suggestions on brand or where else to get injectors that will click into the stock rail retainers? Thanks!

 

My rule of thumb is to multiply flywheel HP by 0.07 to get the absolute minimum size to consider. That results in a less conservative estimate the the online calculators that use a BSFC of 0.500 #/HR/HP, and 80% duty cycle. Modern engines, properly tuned, generally operate at lower BSFC, and modern injectors appear to be able to operate correctly at DC's higher than 80%.

That said, 450 HP x 0.07 = 31.5 #/HR. But why select the bare minimum? What happens if the engine makes more than your estimated HP? What happens on a really dry low humidity day, with ambient temperatures below 60°F, and the barometer above 30”Hg? At the higher air density you run the risk of running out of fuel.

There is absolutely no “downside” to running a 36 #/HR injector given your data.

I would avoid Accel. Don't know about TF. Consider purchasing from a high tech, reliable source like FIC:

https://fuelinjectorconnection.com/

He has some great injector test videos addressing LT1 injectors. I would lean toward the Bosch III's if they make a 36. “Remanufactured” can save some $$$ if they are rebuilt by a reliable source.

 

I have the Ford SVO 30 lb, aka Red Tops. Similar 383/hp you note.

M-9593-B302

Hard to find but this is what they look like

Ford Performance Parts M-9593-B302 Ford Performance Parts High-Flow Fuel Injectors | Summit Racing

 

Thanks guys-

 

I have a set of 36# injectors i was running on a 400hp car. If you're interested let me know. I'm procharged with 60# now so i have no use for them.

 

Would u share the brand/part number and how much you are asking? thx

 

They are delphi stock GM injectors that i to off of a grand prix. I'll sell for $125 shipped. I'll throw in 2 extra, total of 10 injectors.

 

Sorry not what im looking for thanks for offering though -

 

Can anyone explain the difference between thesehttps://treperformance.com/i-2061359...jectors-8.html for $219 and these https://fuelinjectorconnection.com/c...cts/bosch-36lb for $520? Im an idiot, I guess FIC has a good rep, dont know anything about TRE, but I do know the difference between 220 and 520! Thanks-

 

Is it possible the TRE's are “remanufactured”?

Neither of those is clearly identified as a Bosch Type III (or often shown - Type 3). I would clarify before buying either.

Did you look at any of the FIC videos?

https://fuelinjectorconnection.com/pages/videos

 

I got my 60# from TRE based on recommendation from Moe Bailey. I think they are remanufactured Bosch by TRE but I'm not sure. Either way, I have had no issue with them and I would feel confident in getting them if I were you.

I mis-spoke earlier - the 36# injectors i have are Bosch, not delphi.

 

check around for the Ford 30# Bosh....for example:

Genuine Ford Racing M-9593-BB302 30# Fuel Injectors Bosch 0280155759 Mustang LS1 | eBay

 

IMO, he should run a 36lb injector if he is looking at 450-500 hp.