hop on ebay...like $99 and they say its the heavy duty 1 or some crap thatll support 600rwhp

 

Not sure what to buy!! I see racetronix kit for like 250 then i see other kits with the same pump that say all part needed in kit for anywhere from 108-135 What's the differance??

 

That price is just for the pump more then likely. You'll also need a "hot wire" kit too. The '98 is a bit different then the other years in both the fuel pump module and harness. My suggestion would be for the Racetronix kit, but if you decide to build your own make sure the hot wire kit will work with your '98.

Matt

 

There's no need for that. You made your point, you don't need to bash us. There are reasons we do what we do. You yourself said you didn't like to turn threads into flame wars. That's what we prevent...There's a section for feedback.

I would agree with you however, I'd go for the 42#r's at the minimum. Just because someone else did it with less doesn't mean it was the right thing to do.

 

man you guys need to pull out whatever's up your ***... this guy is asking for other opinions and you're calling him cheap and stupid. he already has 30lb injectors, called a couple of shops that deal SPECIFICALLY in ls1's and gotten the same response that the 30lbs would not only be okay, but better for the motor. mix that with the fact that SpeedInc hits the same rwhp numbers with those same injectors and said it never hit 100% duty cycle... i'd call that 3 reputable shops with the same answer being piece of mind. yea there is NOTHING wrong with going a little bigger. and yea of course it's a little safer but on the side of paranoia. imo.

the guy is not trying to cheap out as he stated a couple times that he called to order bigger injectors and the shop told him to stick with what he has.

i have 30lb injectors on my 402 - it's got a tiny cam and all accessories making around 520-530 flywheel horsepower. it has been spun up to 7,000rpm in slippery conditions and never had a problem.

 

I had 36s and ran outta fuel around 5,000rpm's now I have a racetronix fue system and 42's

 

like i said - there's NOTHING wrong with going bigger. every motor/car is different. were you spraying a dry kit on it or what? what kind of power were you putting out?

 

I am going to 60lbr's tomorrow..

 

congratulations youre making not even 500rwhp in a 402 and use 30# injectors.He wants to make 550-600rwhp or MORE he needs bigger injectors.And i didnt call him cheap or stupid i said hes cheating his fuel requirements,thats 1 thing you dont skimp out on,i been helping him you just get on here and try to bash so just STFU and go drive you babe cammed 7000rpming car with 30# injectors.have a nice day.

 

i am running svo 30 lbers, on my 408 and i am dynoing 534 to the tire, its all about the fuel pressure, plus this isnt like a blower car because a blower car requires more fuel because it has to drive the blower. 30 lb injectors are all you need, plus with that large cam it will idle better, more control of fuel at idle with a smaller injector, some you should think about with a large cam, my cam is about the same size, and i had a very weak idle with 42 lbers.

 

There are alot of things that could contribute to a poor idle. If the pcm weren't calibrated to the new injectors properly they would have a difficult time idling. If one or more of the injectors was bad, or pinched an oring, or had a bad electrical connection they would also not idle correctly. There are just too many parameters that could cause a rough idle to be sure it was improper (too much) fueling.
When looking for bigger injectors, remember that they need to have enough pulse width range to provide smooth power. I went from stock 26.4 #/hr injectors on my car (see sig for mods) to Delphi 32 #/hr (36.5#/hr @ 58 psi). I only needed to change the IFR table and they idle as smooth as any 95k mile car I've seen. On the stock injectors the pcm was running the injectors at 2.7-2.8ms pulse widths. With the new bigger injectors they now run at 2.4-2.5ms. All at stock idle rpm (750-800). If the new injectors cannot pulse fast enough at your idle speed, you will have fuel issues at idle. These may be uncorrectable rich idle or rough idle depending on how far off they are. Most aftermarket high impedance injectors on the market today have a rated minimum of ~2.5ms.
Telling people that they can safely run 30# injectors on an engine that will see 550+ rwhp and be fine at stock pump pressures is not true. An injector that is running at or above 90% IDCs is not operating at its maximum efficiency. When you start running higher IDCs, the mass of fuel per pulse the injectors delivers has the potential to become more erratic. When you run injectors for an extended period of time above 80-85% IDC, they will wear quicker. They will collect fuel deposits, which will further reduce the fueling capabilities of the injectors.
You can solve the IDC problem and ensure you have a safe margin of fuel available at all times by either installing bigger injectors and/or raising fuel pump output pressure. Remember that fuel pump pressure is highly dependent on pump voltage. It would be a good idea to recheck all the wiring to the pump and associated grounds. Most aftermarket pumps also have an available hotwire kit to address this issue.

As I see it, DestroyerSS is on the right track with the 42s and aftermarket pump for his needs.

 

60lb injectors are in and my car idles like it did b4. Good. I just have to finish my VE tuning to get my ltrims closer to zero. Then I have to mess with the RAF and then possibly adjust my maf. It should take me a week to finish. I work too much...

 

Allright i am going with the SVO 42lb & a racetronix fuel kit Then to the dyno for a tune. Thanks to all for you input Do i need anything else

 

less talk, more action? I can't believe it took 3 full pages to cover a topic that's been covered to death in both PCM and Fueling sections.

here's a breakdown/rule of thumb rules:
stockish cars, lid/exhaust sort of thing: stock injectors
tiny cams, boltons only: SVO 30s
big cams with lots of boltons and small spray, or H/C setups, or small boost FI setups: SVO 42s
big boost, big cubes, donkey dick cams: mototron 60s and higher, boost dependent.

the end.

 

After that reply i'm not sure if i am going with the 42lb might try to get a set of 26lb stockers and really learn ya
Can you explain to me {us} 1 more time your thoughts on 30lb injectors

 

I think I would need 60 lb/hr for safety's sake, don't you think RHS?

I'm making near 650 FWHP.

 

TTT for 12/28

 

I havent heard anybody mention the 36lbs,why is that?

 

soooooo a 402... with a donkey dick(259/267 .704/.706) cam, coffee can heads, and compression around 12.6:1 SHOULD need 60lbers?

 

all i can say is my 422,built and tuned by mti took a dump with stock gm injectors at 58 pounds of pressure.in retrospect i feel it is easier to replace the injectors than to replace the engine.but maybe thats just me.