Originally Posted by Barry Bordes (Post 8300278)

Has anyone tried Autolite sparkplugs? Particularly the AR 3933?

I need a thick threaded section with a 5/8” hex so I can install a pressure sensor.

The equivalents below are from Chuck Westbrook’s tuning notes.

AUTOLITE PLUGS, normal electrode, 14mm, 3/4" reach, 5/8" hex. Non-resistor,
AR3935 = NGK 7 heat range,
AR3934 = NGK 8 heat range
AR3933 = NGK 9 heat range
AR3932 = NGK 10 heat range
AR3931 = NGK 11 heat range

Thanks,
Barry

Originally Posted by Jack (Post 8301788)

I run the AR3933...work great.

Originally Posted by howard coleman (Post 8306731)

i have used the 9 and 10 heat range. they work fine around one bar and i have not tested them at higher boost levels. i only run the NGK 6725s for higher boost. good luck on your very important project.

howard

Originally Posted by CrackHeadMel (Post 8306984)

Whats the output of that 3k sensor? 0-5v?

Originally Posted by Barry Bordes (Post 8301795)

Thanks Jack.
What is the highest boost your have run with them.
Barry

Originally Posted by Jack (Post 8312882)

14 psi

Originally Posted by glemmers (Post 8313609)

If you have a laptop, you can get a PCMCIA data acquistion card:

http://sine.ni.com/nifn/cds/view/mai...id/1036/ap/daq

or a USB card:

http://sine.ni.com/nifn/cds/view/mai...id/1036/ap/daq

There are a lot of cheaper options than Natiaonl Instruments if you check around.

Thanks Glenn, I'll study that approach.

So, do the Autolite plugs require a turned down socket to fit inside the rotor housing?

Glenn

Originally Posted by glemmers (Post 8313609)

If you have a laptop, you can get a PCMCIA data acquistion card:

http://sine.ni.com/nifn/cds/view/mai...id/1036/ap/daq

or a USB card:

http://sine.ni.com/nifn/cds/view/mai...id/1036/ap/daq

There are a lot of cheaper options than Natiaonl Instruments if you check around.

Glenn

Originally Posted by ChrisRX8PR (Post 8316772)

Hello guys,

I know you are considering these plugs more so you can perform pressure tests with them but I have a question.

Do they work lengthwise on the 13B without modifications in the trailing and leading positions?

Yes, they are slightly shorter than BUR 9EQ.

I am trying to tune my car at around 14-15psi right now and my plugs are fouled which is making it impossible. Not to mention that the stock spark plugs cost an arm and a leg(about $150) and are not the right temperature rating for a boosted car(7L and 9T). I have been looking for some 9 leading and 10 trailing so I could replace the ones in my car at least until I get it tuned properly Will these work?

I usually use BUR9EQ leading and BR10EIX trailing, about $7 each.

Thanks in advance.

Chris

Originally Posted by Barry Bordes (Post 8317027)

Originally Posted by Barry Bordes (Post 8314239)

Glenn do you think this would work?

http://www.starting-point-systems.com/specs.html

Barry

Originally Posted by ChrisRX8PR (Post 8317194)

Thanks for the info Barry.

I am actually talking about an RX-8 engine so no PFC. I have a Microtech LT-10X and I am running LS2 Coils.

I am using a 70mm turbo and running about 14psi at the moment. I will be going with meth injection once I get the car dialed at 14psi so I can push it to around 20psi.

Any other suggestions?

Thanks.

Chris

p.s. Do those plugs you suggest have the "gap-able" tab on them or do they just have the center electrode and the cross?

Originally Posted by glemmers (Post 8317291)

It looks to me like there is no supplied software to control the daq. If you are a programer, maybe this is not a big deal. At 149 Eur ($231), I would lean towards:

http://sine.ni.com/nips/cds/view/p/lang/en/nid/14605

instead. Comes with software for $40 more.

Glenn

Originally Posted by glemmers (Post 8317291)

It looks to me like there is no supplied software to control the daq. If you are a programer, maybe this is not a big deal. At 149 Eur ($231), I would lean towards:

http://sine.ni.com/nips/cds/view/p/lang/en/nid/14605

instead. Comes with software for $40 more.

Glenn