Optimum safe igntion advance?

erictharg
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Optimum safe igntion advance?

Postby erictharg » Tue Apr 19, 2016 12:44 am

I've built a 16V 4AGE for racing {(in my Westfeild Eleven). It's on carbs and programmable ignition. 11:1 CR, 288 deg, 8.5mm lift cam. Typically what is the max safe advance to run? Not had it on a rolling road yet but want to set it to something safe whilst I bed it in on the road. I'm guessing 28 deg total advance should be about right, running on super unleaded, but would appreciate input from those who know.

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oldeskewltoy
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Re: Optimum safe igntion advance?

Postby oldeskewltoy » Tue Apr 19, 2016 8:20 am

tons of ignition maps out there... simply google "4age maps"
OST Cyl head porting, - viewtopic.php?f=22&t=300

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demby123
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Re: Optimum safe igntion advance?

Postby demby123 » Tue Apr 19, 2016 11:45 am

In the end it depends on the knock limit and exhaust gas temperatures.

totta crolla
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Re: Optimum safe igntion advance?

Postby totta crolla » Tue Apr 19, 2016 2:15 pm

28° should be ok until you get it run in enough to calibrate it properly.

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jondee86
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Re: Optimum safe igntion advance?

Postby jondee86 » Tue Apr 19, 2016 2:49 pm

As said above... 28 is safe. I have run my 16V (10.3:1, ITB's, 272 cams EFI) as high
as 35 deg all in at 4000rpm without problems. However, there doesn't seem to be any
more performance to gained by going higher than 32 deg.

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erictharg
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Joined: Sat Nov 01, 2014 5:11 am

Re: Optimum safe igntion advance?

Postby erictharg » Fri Apr 22, 2016 12:38 am

Thanks for the feedback. I'll stick with 28 deg until rolling road on 5 May. Then hopefully first race of the season 7th May.

86 Corolla
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Re: Optimum safe igntion advance?

Postby 86 Corolla » Mon Apr 25, 2016 1:49 pm

Nice setup. I've always wanted to see or drive an NA 4ag in a Lotus 7 like chassis. I have a Locost 7 with 4ag turbo (Alex Pfeiffer's old car). Do you have any vid? Are you in Cali and in any 7 forums?

erictharg
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Re: Optimum safe igntion advance?

Postby erictharg » Wed Apr 27, 2016 12:03 pm

In the UK. And the Eleven is somewhat different to the Westy 7 type cars! Chassis not too dissimilar to the early live axle cars though. Still manages to be just a shade over 500gk with the 4AGE. I do have a dogcam bullet camera and once I'm happy the new drivetrain is reliable I'll aim to get some footage and post on YouTube. Meanwhile it is feeling very strong on our backroads as I bed it in!

yoshimitsuspeed
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Re: Optimum safe igntion advance?

Postby yoshimitsuspeed » Thu May 05, 2016 2:59 pm

Partially related. Some people here might find some useful info in this article.
https://www.hpacademy.com/technical-art ... for-knock/

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