Ok, I'm building a 355 for my car and I'm not going very outrageous with the mods!! Decent aftermarket heads, XE262 cam ground on a 114LSA, ported stock plenum and intake, headers, and an Ed Wright Fast Chip! Aftermarket MSD ignition will be added in the future!! Now if I send my 19# injectors to some place like Cruzin' Performance to have them cleaned and flowmatched will the 19# injectors be sufficient enough for the 355?? Should I get an adjustable fuel pressure regulator also...and if so, what should I set the pressure at??

 

TTT

 

I know SOMEONE has got opinions about this topic!! Amazing how some topics get TONS of useless argumentative posts and then there are other serious ones that don't get ANY!

 

Let me tell you some experience I've had in the last few months.

I have these mods.....

All the freebies
450HP 383
TPIS Big mouth manifold ported
ACCEL runners extrude honed
24lb injectors
Holly in tank fuel pump
SLP 1 3/4 coated headers
3 1/2" header back exhaust
4thgen 1998 WS6 rearend w/323's
Competition Engineering adj. drag shocks
Custom LCA's
Eiback drag springs with airbag
Lakewood adj. panhard rod
Energy suspension polyurithane everything
Stage 3 700R-4
SLP 24-2800 stall
17x9.5 front ZR-1's
17x11 rear ZR-1's
powder coated white
With Dunlop SP2000 tires
Phantom Fuel pressure/tranny temp guages on dual pillar.
Hotchkis tie rod sleeve
KYB front rear sway bars
ASCD SS Hood
SSM subframe connectors
Edelbrock Strut Tower Brace
Throttle body airfiol
AFPR TPIS
MSD 6A box
MSD 8.5 Super Conductor wires
MSD High Vibraton Coil
Ported plenium
Flowmaster muffler *not sure what model*
Low temp fan switch
Low temp thermostat
Tranny cooler
Oil cooler
Goodyear Hi Miler cooler hoses
200 NOS kit *not installed til I learn about this **** though*
Skulte wheel spacers in front
Modified airbox
Lakewood drag struts
V-6 springs in front
Hypertech underdrive pully's
K&N filters <---100HP @ least right there)
Accel cap rotor
Accel ignition module *I think thats what it is*
RedLine synthetic fluids, and water wetter cooling ****.
4 wheel disc
Several custom proms made by Performance Resource
AIR CONDITIONING from a donor car
I know I'm forgetting alot of ****.


I did the math and figured out I'm losing 100 possible HP by not going to 30lb injectors. I would definatly recommend some 24lb injectors for your application. They are enexpensive just look in our classifieds or go to www.camaroz28,com and look in thier FOR SALE board, they have of 4thgenners upgrading injectors all the time and you can get a good set of LT-1 injectors fr 60-80 bucks. Dont even try the 19lb injectors or you'll just be changing them out again.


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[This message has been edited by MATEOZ28 (edited April 15, 2001).]

 

I agree.. Definately don't waste your time on those 19 lb. injectors. The motor will run way lean and probably cough and sputter when under heavy acceleration. I just finished my 355 project and I am using 24lb. injectors. My mods are fairly mild (AFR 190s, 218in,228ex cam, stock TPI induction and CUSTOM chip) and it runs perfect. I run at about 50 psi fuel pressure with the aftermarket adjustable regulator. So, yes you need one of those too. These are cheap things, dude. Spend a little $$$ now so that you won't be sorry later.

------------------
Mike C
88 Iroc 5spd
355 TPI, AFR 190s and lotsa other mods
86 Iroc in pieces!

 

Just for a third opinion, I agree too. Either go with 24# SVO's or maybe some 23# Accels and bump up the fuel pressure. Those 19# may work at high pressures, but you'll be putting in a new fuel pump eventually too if that's the route you take. Just my $0.02.

------------------
1990 IROC 350
Mods: Too busy trying to make it run right to mod it.
Airfoil, Dynomax cat-back, Accel coil, 180 t-stat, Bald Eagle tires,
Hypertech fan switch, Accel 23# injectors, Holley AFPR, ported plenum,
Ruger P95DC, hot wife, new oil filter, thick rubber floormats.
18.0 @ 85MPH since I'm one big-a$$ MF
"It's better to have and not need than to need and not have."

 

As long as those injectors are tested by Rich so you know they match, they will work on a mild 350. #19 injectors should support about 350hp. Are they optimal for that combo, probably not. You might look to pick up a used set of LT1 injectors, those can be had for about $50 and just have them tested.

BTW, it's not the fuel pump you will wear out at higher pressures, it's the injector itself.

 

19's will work for your setup, but will be a limitation at some point. You can up your fuel pressure (by 10 psi I recall) and the 19's will act like 22's ... if they can flow at the higher pressure. A flow test will tell you how good they are at a higher pressure.

If you are getting a custom chip burned, then that is where you tell the ECM what you have. Much can be done in the prom to accomodate for the injectors. So keep that in mind. If you change your injectors later, you will need to redo your prom to take advantage of them.

Consider the cost of getting them cleaned (account for shipping and any parts you need). Then look at new ones. There is not too much difference.

I am running 19's on a modified 350. It runs quite well. I run 55 psi to get my block learn around 128. I know my injectors flow at 55 since I had them tested when I had them cleaned.

I am going to seriously consider 24's, but only after I get my prom burning stuff up and running.

Mark.

 

Cost of getting them cleaned - $10/injector for a grand total of $80 through Cruzin' Performance.

Cost of the new ones - $220/set

I think that's a big enough difference. I'm probably just gonnna see about picking up a used set of LT1 injectors and having them cleaned and flowmatched!