Just want to give a thanks to SouthBay for actually helping customers rather than just selling parts. Some that may have read other threads of mine may know that I am struggling with high BLMs. After they took the time to listen to what was going on, he assured me my Bosch III's I have should support my power level and I shouldn't change injectors, yet. Decided to go with an AFPR to be able to bring the fuel pressure up and see what the results are. Much cheaper than swapping injectors.

It's great to have suppliers that are more interested in helping fix problems instead of just slinging parts!

 

It's not all that difficult with a MAF car to just pull off the ROM, change the injector size, and stick it back on a chip:

http://www.moates.net/burn2-chip-pro....html?cPath=64


https://www.ebay.com/itm/GM-MEM-CAL-...-/112553592450


https://www.ebay.com/itm/SST-SST27SF...p/202692815109


The software is free. And if all you need to do is change the injector size - it takes about 5 minutes with maybe an hour or two learning curve to get up and running. Which is less time than changing the FPR. And it gives you the ability to do ANYTHING you want to your tune. For about $150 with shipping.

You will have to change the fuel pressure quite a little bit to effect much of a change in the BLM's. It's not going to be just a tweak of a couple PSI. And changing the operating pressure changes the latency values and voltage offsets so it's not a linear adjustment.

GD

 

Thanks, I am aware of all of that. Which is why I questioned the actual flow rate of Bosch III's that are in my car. I found the 700's listed on one site as 18.5lb injectors at 43.5psi! Which Southbay assured me was the wrong information. They had confused the GM/Ford Ratings/Pressures. I have other projects to tend to before I decide to start playing with the tune. Thinking next season... but thanks for the links those may be helpful when I go to buy the items I need. Yes in Michigan, there is a time of year when you just absolutely don't take your car out.

At any rate, the AFPR is a "nice to have" I wanted on my car and have for some time. FWIW, SouthBay didn't sell it as a cure all and I don't want to give that impression. I think what was said is "it should help some and if it doesn't it won't hurt either". I actually appreciated that over just selling me different or larger injectors to make a sale and that is what the shout out is for.

FWIW, I if you look at another thread I have where I questioned the FPR being bad anyway(Here), I had previous issues where the fuel pressure would not come up with throttle input. Actually, it wasn't coming up at all while driving under load. The vacuum line to the FPR was downstream of the check valve and would never let the regulator see positive pressure when the engine was under boost either. Long story short, replaced the check valve with a 1 port for the HVAC controls and T-ed in the line before the check valve for the FPR. BLMs are down about roughly 10pts across the board from where they were.

Other things on my mind, I want to take the manifold off, put it in the wash tank for appearance. This is more of a Nice to have to play with and see if running a higher nominal pressure will help some more. Even when I start playing with my tune. Also, last year the 9th injector had a leak at the O-Ring, might go ahead and replace all the ones on the fuel rail as preventative maintenance.

Didn't mean to make it sound like turning the pressure up a few PSI would be a game changer, I know it won't be.

 

Thanks for the thumbs up!

 

Hi @southbay08 , looking to purchase 22lbs injectors for my measly 305 (built, cam, intake, etc.) Wwhich injectors do you recommend? 86 IROC, TPI, etc.

Aside from the PROM programming, are the injectors just plug n play?

Thanks

 

Get their Delphi 22s. Great injectors, have them in my car.

Plug and play aside from the tuning you'll do.

 

22's for a 305? Well if you want the 22's obviously we have the bosch lll's and we have the Delphi's as well. Both are plug and play. Some people find that they need a tune with the bosch lll's however they are less expensive. If you decide to purchase a set you get 10% off with promo code tg11
Do you really want 22's for a 305?

 

He has work done to the intake and heads plus a larger cam. If he is already doing his tuning, he should be able to dial it in. I wouldn't see why his car isn't breathing as well as a factory L98.

 

Hey guys,

Thanks for the info. Yeah I was looking at the Bosch 22's simply for the price and that is pretty much the only thing I have not changed on the car (injectors). I did the tuning with Moates awhile ago but I can bust it all out again and be sure to re-tune when I install the injectors. Yep the engine is cammed and fully rebuilt (bored, forged pistons, cam, port&polish heads, etc.) and has aftermarket accel lingenfelter manifold, AS&M runners, ported plenum etc etc..

Is it an issue to have TOO big injectors? I guess with a proper tune it can't hurt right?

 

Yes, too big for the application can be hard to tune, but 22s are a small jump.

The Bosch 3s are the loudest injectors Ive ever heard. Your car now sounds like it has a bad exhaust leak. Hated them so much. Glad I got the Delphi to replace.

 

I have heard louder stock injectors. I have Bosch 3's and I wouldn't describe it as an exhaust leak at all.

 

ticky ticky ticky ticky ticky

I can always tell when a third gen has B3s just driving by. Either sounds like valve train noise or an exhaust leak, pretty bad look when the injectors makes more noise than the v8 engine haha

 

Is there a reason why you want to go with the 22's? You can run them with a 305 however when customers have tried it they said that the performance was not great.
We always recommend the 19's however if the 22's are too big you can always back off on the pressure

 

Because he has engine modifications that require more fuel. It's not a bad idea to start with a properly sized injector for the mods and fine tune from there. 22lb is a good injector size for what he has done to the car.

He'll likely have similar fuel requirements, or more-so, than a stock 5.7 TPI.

 

sorry that response had typos...ugh I meant not that great.
But if he's not really increasing his horsepower even though it's a small jump it's still an increase in fuel. With a good tune he may be able to get away with it

 

Not enough coffee this morning?

 

Thank you all! I'll be getting the 22's and will tune it so it works properly.

Have a few thousand miles since replacing all the intake gaskets.. Do you recommend that I get a new set from Fel Pro (I see a set at a good price on your site) or can I just remove and re-use my existing ones?

THanks,

 

Btw are these plug n play with my manifold? Do I need a special spacer for these? I remember reading something about needing spacers perhaps.. I could be wrong though.

 

I've had good luck re-using newer intake gaskets. If they come off clean then it's usually alright.

The set isn't that expensive though, and does save you having to re-do your work in the future if there is a leak.

 

It's Friday thtanner I'm on weekend mode!
I would recommend a gasket kit. When you remove yours it can tear. Don't forget if you decide to purchase anything from our website make sure you use the promo code tg11 at checkout. You'll receive 10% off.
You cannot pay with paypal though....they're being a real pia.... they have some kind of glitch in their system with our website that will not accept promo codes however if you pay with a credit card you'll be fine.
You can always call the shop. We'll be more than happy to help you

 

No spacers needed with the injectors southbay sells. Plug and play.

Delphi will re-use the original injector retainer clips. The noisy Bosch do not.

 

If you're thinking about the 22lb bosch lll...normally we would have to apply our adapter to the bottom, however since you have an aftermarket intake they do not require any spacers. The delphi's are a direct fit as well

 

I have a blower so... my noises are a bit different.

The lifter tick in my Stealth and about any DOHC car I have owned was worse than my Bosch 3's IMO

I can't remember specifically other cars to mention, but I have heard loud clicky injectors. Between my Procharged Vette with factory injectors and my Vortech IROC with Bosch 3's... I notice no difference in injector noise. We all hear different frequencies better than others, maybe it's just the right one to really stand out to you.

Kinf of hard to dispute unless we take some sound measurements. My IROC is down for winter projects right now so I can go measure.