Methanol question

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Feb 10, 2008 | 04:41 PM

vetterdstr

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From: San Jose/Bear Valley CA

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Methanol question

If you have a high HP car that was tuned for 100% methanol and then switched to 50% methanol and 50% water. Would you need a new tune?

Feb 10, 2008 | 04:54 PM

1%r

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St. Jude Donor '03 through '17

You'll be running lean if the tune was based upon the meth being used for additional fuel.

Yes

Last edited by 1%r; Feb 10, 2008 at 04:59 PM.

Feb 10, 2008 | 06:13 PM

madmatt9471

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From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----

Yes!

Anytime you mess with fuel mixtures and try to run it it will need to be tuned ACCORDINGLY!

Thanks,Matt

Feb 10, 2008 | 06:46 PM

Chris Stewart

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From: Weatherford, TX

I'd be curious to log with a wideband and see how much the difference really is. Assuming the tune is fat to begin with (aka safe) then you may not be giving up much. Hard to say without logging it.

Feb 10, 2008 | 07:25 PM

BlckC5

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From: lehi utah

Quote:

Originally Posted by Chris Stewart

I'd be curious to log with a wideband and see how much the difference really is. Assuming the tune is fat to begin with (aka safe) then you may not be giving up much. Hard to say without logging it.

Feb 11, 2008 | 02:27 PM

MIKE-C5

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From: San Antonio Texas

St. Jude Donor '05-'06-'08

Quote:

Originally Posted by Chris Stewart

I'd be curious to log with a wideband and see how much the difference really is. Assuming the tune is fat to begin with (aka safe) then you may not be giving up much. Hard to say without logging it.

Feb 11, 2008 | 05:49 PM

vetterdstr

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From: San Jose/Bear Valley CA

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FWIW, my car doesnt seem to use much methanol at all. It only has a single nozzle system on it. the ONLY time I seem to use lots of the stuff is out on the road courses. I guess its safer to leave it like it is than to try the 50/50 thing with the water.

Feb 12, 2008 | 01:50 PM

0AIS

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From: www.alcoholinjectionsystems.com info@alcoholinjectionsystems.com Phone: 1. 801. 447. 2559

Quote:

Originally Posted by vetterdstr

If you have a high HP car that was tuned for 100% methanol and then switched to 50% methanol and 50% water. Would you need a new tune?

Yes you will need to retune for it as you are going to lose some of the additional fuel the methanol injection system was adding. Additionally, depending on how the engine was originally tuned, you may also have to back off some timing when switching to a 50/50 mix.

The only way of telling how the tune will be affected is by re-dynoing your car again. There are to may factors alone just in the controller settings and nozzle size to try speculating exactly how much your tune will need to be changed.

A better question is why are you asking about switching to a 50/50 mix?

Last edited by AIS; Feb 12, 2008 at 01:56 PM.