Doesn't that put you also in the armchair mechanic group then? Also why do you insist on doing that in the car? What is wrong with taking it out for ease of getting to everything? BTDT after we started trying to get to the cam on another car.

Funny thing is we did get the car to run right and reliable. Just that your parts list must be carefully though out like every other thing in iife. Throwing a cam without thought with a set of heads from some system and intake from yet another system etc.

 

Yep. I saw a video of Bosch III spray patterns and they are so much better than OEM. The spray is a more modern pattern and (going out on a limb here), would say just the upgrade of the injectors would get a little (I repeat a little) more power and better mileage due to the more finely atomized fuel charge burning better.

If I wasn't in the middle of a build myself, I would simply replace my oem ones with said Bosch III's.

Where in Ohio are you (85 CRVET) ?

 

Bosch 3 injectors would get rid of the issue that you have to always use 100% gas. IDK about the extra power or fuel economy. I have doubt that the atomization effects would be significant

 

doing a bit of research, that could be correct when just replacing the injectors without any supporting tuning, etc. here is an old thread on the 3's

https://www.corvetteforum.com/forums...injectors.html

in the diesel world, spray pattern/atomization is everything. a change in the injectors was just 1 small part of the equation that made a Duramaz LBZ engine such an advancement over the LLY. but in this case we are talking about injectors that run at 22,000 psi as opposed to 44.5'ish.

I am going to do more reading, however, more atomization the better it burns. case in point, when I was in the farm bureau we heard about a farmer who was burning brush. he poured gasoline on the piles to get them burning. it was a cool damp, windless morning and the gas atomized and stayed concentrated. when he lit it off, it exploded and killed him. he essentially made a fuel air bomb, such as the MOAB.

However, there is a reason GM went with better injectors starting with the C5's.

 

I dunno about when it was new, but if his 85 injectors are anything like mine, I bet there's an increase by replacing them with new Bosch right now.

 

On a Direct injection engine, it will make a difference. Since these just spray at an intake valve, and it is batch fire, it really won't make a damn difference what the spray pattern is.

 

 

Here are some videos showing how better injectors (gasoline, not direct injection work)



batch fired or not, better atomization is going to have improvements. the limiting factor is the computer in the 85's. it is slow compared to later ones. it is 8 bit vs 16 bit in 86's. in 1985 in the computer world big changes were happening. IBM was implementing new machines, new OSes to take advantage of the better processing power available with 16 bit architecture

the real limiting factor is the op needs to find someone who still will work with the chip in the 1985 and tune it for the mods being planned. that needs to be found first before any money is spent.

I found this out when planning the mods on my 1996 as it is a 1 year step child also.

if you look at folks like PCM for Less in N.C. they don't offer any services for 1985's.

however TPIS does

https://www.tpis.com/pages/efi

https://www.corvetteforum.com/forums...-corvette.html

the OP really ought to start communication with one of the folks going to do the work so he can budget that into the build also

 

I wouldn't get too worried about turning just yet. My 85 runs just fine and I haven't tuned a thing.. And it'll run just fine till I get around to it, if I ever do.

There's some solutions out there.. MOATES has some stuff. You can re-pin and use the newer ECM without much difficulty. You can even jump all the way up to the LS computers in 24 or 58X and use modern flash tuner software with them, if you're so inclined. I saw a guy using 90's VORTEC PCM's and a custom tune..

There are options if you want to move that route later, and the computer grind cams are designed to work with your TPI. Don't freak yourself out over it.

 

Not saying it isn't a good thing to have a better spray pattern. All I'm going to say is if you have a stocker that somehow isn't crapped up and a new Bosch 3, I'd be willing to bet you won't actually be able to measure a difference between the two engines. You're limited to how well it will stay atomized passing through he runner and then through the valve into the chamber. Port is better than wet flow and direct is better port. Technology is great. I will say though, the Bosch injectors spray pattern will have benefit as you go up in power.

Not trying to argue, the biggest thing is if the freaking injectors are working as they should. Going from multecs to 3s will be a good thing because chances are the multecs aren't working properly. And then you don't have to have failure in the back of your mind.

 

Aimple and effective, ebl flash. Having first hand experience with it, it's more than enough for most mills and Bob is extremely helpful with everything. There is a learning curve but the self learning VE tuning is a God send.

 

The OP is an 18 yr old with no experience. It is not like the old days when it was easier for us to figure out if it is a failing component or the change we just did that is making the car run bad.

He doesn't have your guy's basis of experience in mechanics, you can tell that just from the questions across all his historical posts.

That statement is not a slam an insult a put down. Just a statement of fact. We were all there sometime in our lives.

I think that if he has someone tune the car for him there is less of a chance of it breaking, getting it running right etc than simply throwing the parts in and guessing if all are functioning.

Go back to this thread

https://www.corvetteforum.com/forums...3-came-up.html

The cheap rate muffler shop eliminated his O2 sensor bung, didn't put one back in, the OP stated the wire was dangling.

The recipe you all have given him should make it pretty easy for one of the remaining shops that have experience with 85's to burn an image for him to use at a really reasonable price.

But too much of an incremental approach, without a planned route to take could very well end up in more results as happened with the muffler/exhaust pipe venture.

Currently I am asking advice from one of the posters in this thread behind the scenes. Not ashamed of it. I am planning for, asking questions of, learning about these cars (catching up after a 30 some year hiatus from the performance gasoline engine scene). But at least I have a basis to go from and crossovers from working on my truck/fixing it/modifying it and 45 yrs of basic mechanic experience to fall back on.

 

You need a plan otherwise you end up going around in circles.

 

That is what the tuner is for. To tell you combinations that he has done that will meet your expectations. Otherwise, you are going to throw him a pile of parts and expect him to make it work regardless of what he thinks. Find your tuner first then ask him what he thinks will work best and NOT toss him a pile of parts that might or might not work well TOGETHER and expect him to make it all function smoothly.

Maybe if they aren't modified. If they are, they might stomp on you

 

JHE https://jheinc.com/ has a guy there that will probably do it. Brian Ebert. He used to be the guy at Hitech Motorsport. Not sure if Hitech Motorsport in Elk River MN will still will do the old stuff but maybe.

 

There are. The caveat is that they are close enough to stock spec to allow the computer to adjust so it is kinda a hamstring operation to have the cam limit you.

 

IIRC, the runner is dry so you have the injector pulsing next to or pretty close to the valve. So a functioning Multec isn't going to be practically much better than a Bosch 3 in the real world from what I can see. Maybe if you get into something really exotic it might.

Multecs will get eaten up by any ethanol so you have to limit yourself to a few gas stations and them only which is the question. How many sell Premium ethanol free gas? Not that many from what I see so you are limited to filling locations. Not much fun. After all these years, anything will get some crud on them. Even after 3 years, I get build up in them when I see the report from FIC concerning "before and after" results.

 

This is going to take cash and some careful planning. By 1992 The LT1 already had 70 more HP than the 85, the 1996 LT4, 100 more HP. Then start the C5's with 115 more HP just to begin with.

So you can probably stay with the stock LT1s and early C5's if you have enough money. I will have close to $4000.00 maybe a little more into just the engine of my 1996 with a goal in mind. That doesn't count the laptop/computer interface and data logging software I will be getting, nor all the money spent so the chassis will handle the extra power.

Just so you have realistic expectations of the goals you are setting -vs- the amount of money you can afford to spend at this time. The 1985 will make a really nice driving machine of you do it as a package and spend accordingly.

Technology ran away from the C4s and the early C4s especially. Not that it can't be done, but it takes a lot to get into the 400 hp range of the base model 2005.

It used to be called "cubic bucks" and that statement still holds true. Ask the folks on here that are running spirited C4s about how much investment it took to get there.

Not trying to discourage you (the OP) but there is no magic wand to keep up with later cars. There is cash and a plan.