How much power can 8.8 IRS handle - TCCoA Forums
 
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post #1 of 11 (permalink) Old 08-12-2010, 04:28 PM Thread Starter
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How much power can 8.8 IRS handle

was wondering how much power my IRS could handle, I drag race the car, and have been told i should consider a solid axle, but was wondering if I put new IRS axles in if I would be ok. now, when I think of solid axles, I think of non irs (straight axle), am I thinking correct? I was told i could get one from a fox body mustang and it would bolt up. I'm not a big fan of giving up my rear irs, bc it is not a full time race car, but i do have plans of putting lots of power to it via new engine, a few bolt ons and laughing gas. Of course i know i also need to switch out my drive shaft to an all aluminum. Was also considering mini-tubbing. Any help/opinions will be appreciated, thanks

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post #2 of 11 (permalink) Old 08-12-2010, 04:35 PM
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well i dont think a solid axle will bolt up without some serious modification.... but it has been done to a few mn12's not many though. the IRS is pretty tough to begin with... there are cars on here that are running in the mid 11's or lower with an IRS rear end with stock axles. i think you'll be fine, but if you do end up breaking axles you can swap over some 03 04 cobra axles which are alot thicker and stronger then the stock mn12's.... just do a search on that swap.

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post #3 of 11 (permalink) Old 08-12-2010, 04:38 PM
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How much HP are you making now? How much HP are you planning or thinking of making? (Be realistic now!)

I run 3.73's with a posi at almost 400 rwhp with a stock pumpkin cap and no brace and a stock IRS. I've seen guys run even more HP on the 8.8. The IRS will be fine.

You've been talking to too many Mustang guys who don't know sh!t about an IRS. IMHO don't wast your time and your money trying to switch over to a solid axle.

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post #4 of 11 (permalink) Old 08-12-2010, 05:35 PM Thread Starter
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Thanks, I knew I had been told something about the cobra axles, just couldn't remember what it was. I will probably change them out anyways since the car has 270, 000 miles on it. I have a "strange" catalog and was looking at some stuff in there. @ T-Monkey, my power right now isn't much over stock, but I'm getting a new forged engine soon, and plan on at least a 100 shot, I will have to get he car dyno'ed so I have no idea about power right now. My nearest 1/4 mile track (memphis) closed last year, so i will mainly be running 660. The guys at the company who sells the engines told me with all the stuff I am going with, I should hit mid 6's in the 1/8 mile, but we will see. sounds like a lot for a big heavy car. thanks guys

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post #5 of 11 (permalink) Old 08-12-2010, 06:09 PM
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Wheelhop under moderate power will probably kill the halfshafts quicker than just straight out overpowering them. Agreed ^ research and see what you can swap in for halfshafts; cobra, supercoupe, whathaveya.

There's no way you can simply just bolt in a straight axle in the MN12 and call it a day. This would be serious work that should be done by a competent chassis shop; the car is going to be backhalved regardless of whether you tub it or not. The smart racers who've been racing MN12s for more than one season have concentrated on working out their wheelhop issues instead.

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post #6 of 11 (permalink) Old 08-12-2010, 06:14 PM
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Quote:
Originally Posted by Trunk Monkey View Post
I run 3.73's with a Trak Loc at almost 400 rwhp.....
You know better than that, TM.

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post #7 of 11 (permalink) Old 08-12-2010, 06:24 PM
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FWIW, Raxles out of Gainesville, Florida used to make huge axles for the IRS, but seems I remember they said they don't make them anymore last time I called down there and that they were crazy expensive anyways. I'm sure they could point you in the right direction, however.

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post #8 of 11 (permalink) Old 08-12-2010, 06:45 PM
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FWIW, Raxles out of Gainesville, Florida used to make huge axles for the IRS.....
The 28 splined stub going into the diff is still the same size. You can gain some strength there by switching over to the 31 spline versions, but then the hub side stub is still going to be the same as it was.

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post #9 of 11 (permalink) Old 08-12-2010, 07:09 PM
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The 28 splined stub going into the diff is still the same size. You can gain some strength there by switching over to the 31 spline versions, but then the hub side stub is still going to be the same as it was.
Yeh, I thought of that. Somewhere on this forum or one of the others I saw pics of the 31 spline axles from a Cobra snapped off clean, so that is definately the weakest point...

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post #10 of 11 (permalink) Old 08-12-2010, 08:28 PM
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Keith (aka VicRattlehead) ran stock axles until last year when he finally broke one. They'll take quite a bit of abuse...

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post #11 of 11 (permalink) Old 08-13-2010, 01:17 AM
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Keith (aka VicRattlehead) ran stock axles until last year when he finally broke one. They'll take quite a bit of abuse...
On an automatic they will, manual transmissions break them constantly with power.
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