Whats a cheap setup for a TBI 350?

 

Btw how can i tell if my motor is HEI distributor?

 

cheap setup for what?



you have HEI but external or seperate coil. usually HEI is commonly referred to coil-on-cap which ended in 1986 for f-bodies.

 

are you wanting a MSD ignition box for your stock TBI?

 

The MSD box's are junk, and make little (less than 2-3 hp) or even loose power. Plus they are unreliable as hell. There is a reason nascar runs two of the boogers....their required to by the rules otherwise they wouldn't run them at all. Just get a performance module and coil for your stock dissy, you won't make any more power but you will be able to rev higher without any misfires.

 

when i go supercharger in the future I'm getting one but as soon as i get it I'm sanding it and making it look like the GM nascar ones. look them up under msd in the racing parts on ebay. They look oem and would hide well in my almost blue car.

 

i gained about 2-3 mpg... im not sure on the hp, but the mod did what i wanted it to do... gain mpg... I gapped my plug little bigger too.. i really love my setup, cause it does rev quickly.. the stock setup is a inductive setup (L)... the MSD setup is a capacitive setup (C).... here is some L + C electronics 101

the stock ignition systems are much different... they are inductive systems, instead of capacitive... In a inductive ignition, the coil must store and step up the voltage to maximum strength in between each firing. At higher rpm, since there is less time to charge the coil to full capacity, the voltage falls short of reaching maximum energy which results in a loss of power or top end miss...

The MSD ignition features a capacitor which is quickly charged withing 1 millisecond with 460-480 volts and stores it until the ignition is triggered. With the CD design, the voltage sent to the coil is always at full power even at high rpm!

 

i might put one on but are they easy to wire? remember I'm a carb and no emissions convert, take it easy on me. lol.

 

yea, they are easy to wire man, especially with TBI systems, the instructions are pretty straight forward... i did my install in like 15-20 mins, but i studied electrical and am very confortable with any type of wiring... I can always pull out the wiring directions if you need help...

 

Yeah I've decided to go for the Cap and Rotor from MSD, the GM Blaster Coil, and a 6A box when I get the money for it. About what should I set gap to for a LO5?

 

stock LO5 is .035 gap, but i regapped it to .055... the truck loved it, and returned a increase 2-3mpg and had a much better seat of the pants difference.. however msd has a chart to match gap to compression... so you will be more than set...

 

"Just get a performance module and coil for your stock dissy"

Does anybody make a performance module for the later TBI electronic distributors that have the separate coil, I've never seen one.

Does anybody know what RPM these later stock distributors start running out of poop?

The dyno pulls I've seen show that if you stay in the RPM range of a stock ignition system you don't make any more horsepower with an aftermarket ignition. The gain from the aftermarket ignition comes if you are running the engine at an RPM range above the what the stock system can handle.

Paul T.

 

I'm gonna try your gap and see how it runs. The motor runs great on regular gas so i'm assuming its somewhere between 7.5 and 8.5 : 1. I'll check the chart on msd's site thanks!

btw what was the compression on your lo5 that you ran .055?

 

I know summit racing sells them. I had one on a different car and i saw a big improvement on the upper rpms ( i also put in a rare 65K coil, then forgot to change the cap and proceeded to blow it up)

I would say personally my TBI seems to fall on it's face around 3500 but that's more than ignition that's the smog heads and all the other stuff they did to TBI to give them a bad name.

Personally i would go with the module and get a better coil and that should help. I did see gas improvement on my old car and less stutter in high rpm. but for the msd, TBI has low compression and does not really need it too much.

 

This is why I am considering saving the $200 on the box and just doing the cap, rotor, coil, and the $90 8.5mm plug wires I just bought...

 

The stock ignition module does a poor job of driving the coil to ground at any speed over 4,000 RPM. It's also a common failure item in hot climates. Besides giving you advantage of multi-spark ignition occurrences whenever the engine is moving less than 3,000 RPM. I get a full 480-500v ground signal to the coil at up to 10,000 RPMs with the 6AL (We use them on a lot of different engines). I've installed hundreds of 6AL modules and I have only had two fail. It's a much better ignition grounding module than the stock GM module. Decreasing the spark plug gap to .020 and running one heat range colder, (NGK) spark plugs we gained 21 go on a stock TBI setup with no other changes. The customer also said that he got better mileage, ( probably because with the ability to run the colder plugs he had less misfire events and therefore the timing remained higher because the knock sensor wasn't regarding the timing)

 

Because of the improved spark capabilities we have had a lot of success running one heat range colder spark plugs, (We use one heat range NGK plugs because it's less of a heat range drop than the next colder AC plugs) We can gap the plugs at .020 with the additional spark power and the multi spark at low RPM. This change makes the engine less likely to have detonation events and so the knock sensor doesn't retard timing. We see nice power gains, better fuel economy and a longer lasting engine with this setup. I hope that helps you.

 

So, if you are increasing spark energy, why would you use a SMALLER gap on the plugs, than stock??

 

Hey so bought a hei distrubutor with a msd 6al and I have a stock tbi is there and after I installed everything I realized my injector weren’t getting sending fuel because they weren’t getting a signal is there anything I can do to fix this so that it can send fuel down?

 

Small cap hei ? What icm does it retain the 4 wires to ecm ?

 

so basically it’s a big cap with a coil pack that connected to the max 6 Al but I didn’t realize it’s meant for carbuersted engines haha so basically the the connection that goes to the computer doesn’t fit anywhere and so the computer doesn’t know to open the fuel injectors so it cranks and sparks but no fuel is there any way to bypass it or do I need to make it carbed

 

Get the right distributor or go carburetor two choices

 

what’s a good carberator for a Chevy 1994 5.7

 

You might start a thread on another form if not third gen. Not on dead thread subject

 

Yes. Scrap the 4-pin module HEI, replace it with a properly-functioning TBI 8-pin module HEI, buy the wire harness MSD sells to connect the 6AL to the stock TBI HEI.

https://www.summitracing.com/parts/msd-8876

Problem solved.

 

I’d there any video or steps to do this ?

 

The steps you need to follow:
Step 1.
Step 2.
Step 3.
Step 4. Follow instructions included with wire harness and MSD box.