Well Jon at FIC told me that the Bosch III injectors atomize the fuel as it enters the manifold making it burn better and makes more horse power than the standard injector.. Well they are in my car and It was like I put a supercharger on it.. Yes my injectors were bad but my 88 L98 has never had this much power. Now I can't wait to meet up with those Mustang boys... I want to thank everyone on the forum that pointed me to Jon and want to thank him for all the help.. I'm a very happy vette owner now for sure..

Butch

 

cool, injectors seem to be a major problem on these now

 

As technology evolved in the fuel injector dept. most people would not believe that injectors can make horsepower. The newer style injectors that atomize fuel at the nozzle provide a much better mix of fuel and air. The more fuel you can get into the same volume of air will produce more power. A few thousand sets of Bosch injectors have been installed on countless c4 and TPI camaros and F'birds. We have gotten hundreds of e mails from these customers proclaiming that their engines seem stronger with a lot better throttle response. The proof is real testing by real customers. For those who do not know the Bosch 3 injector became standard equipment on Every LS1 that was ever built for a C5.. GM engineers could have picked from many different injector manufacturers. Since 97 all Ford 4.6 v8's used the Bosch 3. As did BMW, Rover, Porsche and Volvo. There must be something that the engineers liked.. I hope a lot of our customers will comment on this thread. IMO This is the one single mod that has the best bang for the buck,

 

Hopefully in few years a company will do with C4 like they are doing with the DMC DeLorean. They now rebuild them with original parts. These parts are leftovers from when the factory was auctioned.

 

Replacing the injectors can cure a lot of performance issues on C4s. These cars are getting old and the injectors are wearing out or plugging up. The newer ones are better, but I haven't found any "free" ones.

 

I installed some Bosch IIIs from Jon and it cured a lot of my ills, I no longer have hard starts when hot and part throttle response is night and day better.

I won't say that I have more power as I did other work around the same time and haven't been back to the track/dyno since putting in the new Bosch IIIs from Jon but they are totally worth every penny!

 

2 Thumbs up for Jon at FIC -- I replaced the injectors in my '91 ZR-1 and I'm very pleased with the performance and customer service!!

 

Don't the LS1 Injectors require more fuel pressure?

 

Call me a skeptic but I'd need to see back to back dyno pulls showing a power increase on an engine with functional stock injectors that are then replaced with Bosch III's, no other changes permitted.

Owners who install the Bosch III's to replace Multecs that no longer work obviously gain horsepower simply because they now have 8 working cylinders!

Not intended to diminish the product or FIC in any way, I am a believer, I would just like to see actual numbers. How about it Jon, it would make one hell of a marketing video?

 

Exactly the same can be said for air filters spark plugs catalytic converters fuel filters.. Anytime you you replace a faulty part with a good one it is going to run better if not what is the point of changing it.

 

Well my stock injectors were leaking from the electrical connection but the injectors were clean and not clogged so they were working just leaking.. All I know is that my corvette has never had this much power.

 

No argument from me, but if you reread my post please note that I said functional injectors, not faulty.
As I understand the statement being made by Jon, the Bosch III's make more power due to improved atomization, I would like to see the proof.
Dyno an LT1 (easiest to change injectors) with stock Multecs that is hitting on all 8 cylinders, then swap in the Bosch III's with no other changes and dyno again.

 

I am going to do that, I am looking at a 6,000 mile GS.. If i can get the car its a no brainier that the multecs will go in the lake.. In fact multecs are great for bottom fishing.. run a drill through them and they slide on the line but lay on the bottom.. It's a proven fact that an engine will make more power with a proper mixture of atomized fuel, unburned hydrocarbons were a big issue with the EPA. Therefor, the injector and car companies had to get cleaner burning engines. The higher fuel pressure in the LS1's made the Bosch 3 work even better. Porsche went to 5 Bar. So I don't have to prove the theory, there is no theory, It's fact. Remember droplets of un vaporized fuel does not burn or attach itself to a molecule of oxygen. The new tech of GDI (gasoline direct injection) uses a nozzle in the cylinder instead of the intake runner utilizing 100 bar plus pressures (about 1600PSI) this lean burn tech gets 100% of the fuel mixed with air eliminating unburned hydrocarbons and using air fuel ratios to 40 to 1. With that said, how would it make power running so lean? The answer is a atomized mixture. And please I am not a scientist so please take it easy on me..LOL

 

Theoretically I agree with Jon. The more fuel molecules you can attach to oxygen molecules for combustion there should be greater power because the burn will be more complete. Gas mileage should increase to. So with the greater disbursement of fuel the molecules will have a better chance to attract a oxygen molecule.

To back up my belief I ordered a set of 32 pound Bosch 3's for my moded TPI yesterday from Jon.

 

HERE IS AN INTERESTING VIDEO.. THIS IS THE BOSCH GDI INJECTOR..

 

interesting

 

HERE ANOTHER WATCH THE BOSCH 3 ITS THE 2ND FROM THE RIGHT #1 IS AN ACCEL, NUMBER 2 IS A bOSCH 1 USED IN 85-88 VETTES

 

Sounds good Jon, I look forward to the results and have no doubt you are correct, should be interesting to see the difference.

 

Jon in all due respect there are dozens of things that effect air fuel mixing charge preparation and vaporization from injector spray patterns is only one and while important just not the biggest thing always. Fuel vapor pressure charge air temperature chamber turbulance there are dozens of factors that move it all over the map. Saying that you should optimize everything but the only thing that proves a given application will benifit is to test it comepletly on a dyno. I have been in the pro racing biz for 30+ years doing cyliner head and manifold design in the efi part since you had to program in hex offline.. So these are not just opinions or something I read somewhere on the net.

 

You are quite right. However, lets take a good running 270 approx hp L98, using GM's engineering.. Lets use their cylinder head design, manifold design and fi design. Now lets go back to 1989. They needed to select an injector.. There were no Bosch 3 at that time. Gm was partners with RP so the new multec was used.. Was it the best choice. It was the only choice.. If the Bosch 3 was available would they use it.. Probably, because when it was introduced in 1997 GM scraped the multec and installed the Bosch 3 in every LS1 they made. Including the export motors to Holden..Then in 05 the Bosch 4 was introduced and guess what, GM has used it in every LS2-9 including the new ZR1. All I am saying is now you can have the Bosch 3 for your C4. Will it run better? just ask the guys that put them in.. Also, don't forget that once you put in the Bosch 3 an injector swap can be done without removing the plenum..