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Microtech LT10s on an N/A: Should I add a HI-6?

Old 02-01-10, 12:36 PM
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LT10s on an N/A: Should I add a HI-6?

Hey there,

I've been running an LT10s on my 86 street ported N/A for a while now, and other than the attrocious fuel milage the car runs great and I'm loving it. I've recently been wondering if a CDI box would be worth it at all, and from every thread I've read it's split between people who say they are useless (Aaron )and people who love them. I've come across a Crane Cams HI-6 (Model 6000-6421) for cheap, and was wondering - is it worth it? Would you guys throw it on the car? Will it even work with an LT10?

I know it's not going to suddenly give me 10 hp or 10 MPG, but any improvement in fuel power or smoothness is a plus.

What are your thoughts?
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Old 02-01-10, 04:07 PM
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SOrry to break it to you mate but CDI for big hp cars is a great thing. But not for an n/a car. IT IS not going to fix your fuel economy or your smoothness.

You need a tune and do it in matrix mode and it will fix all your problems.
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Old 02-01-10, 05:07 PM
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That's kind of what I had figured, and the reason I didn't pick up a CDI back when I switched to a standalone. That said, it's one of those things that can be a cheap bolt on so I started to rethink it.

Yeah, Matrix mode is the next thing I need to do. It's been tuned, but there is a step as the secondary injectors start and I've been led to beleive that Matrix Mode will fix that..... assuming it's not the secondaries sticking. As soon as I can get time with the local tuner I'll be doing that. Until then though, it's still nice to drive!
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Old 02-02-10, 03:00 PM
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You need to get a new tuner. No offense but you dont need matrix mode to fix a step in the secondary injectors coming on.
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Old 02-02-10, 03:50 PM
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The guy who did it is quite well respected around here - but his forte is high horsepower engines, so he may have been somewhat out of practice working on little normally asperated engines like mine. lol

It's an odd issue really, and one that I'm sure can be tuned out. On the dyno it seemed to have this step as the secondaries came in - nothing big but perceptable. We were also having issues with the vaccuum readings at higher revs, so I changed the pick up point for the vac line and installed an inline filter in the line.

When I had finished the Microtech install I had planned on taking it to a tuner that had been recommended to me - who I knew would tune it on Matrix Mode. I tried for 6 weeks to book time with him but never could, so I chose to have the base tune by the other guy who has a really good reputation around here.

Now that the car runs and is tuned, I had planned on giving it the once-over (like freeing up the 5th and 6th ports to make sure they were turning smoothly) and then going back to my original tuner choice and have him do it "properly". In preparation for that I've started to think "What else can I do for the car" hence the question of "would it be worth spending $50 on a HI-6" which I gather it's not. With that said, besides the usual new plugs etc, any other advice?

Thanks for the input - it's greatly appreciated!
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Old 02-02-10, 05:41 PM
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The car is reading vaccum as hte revs climb because their is a intake restriction. Fairly normal.
Need a better intake manifold.
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Old 02-02-10, 06:19 PM
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Haha yeah, moving the vac pickup point did help a bit, but an S5 intake manifold has crossed my mind as they are cheap, easy to come by and easy to make fit.... I'm sure there are better options, but cost does then enter the equation.
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