grunt box. is it really worth it? - MR2 Owners Club Message Board
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post #1 of 22 (permalink) Old January 6th, 2006, 14:33 Thread Starter
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grunt box. is it really worth it?

i just got mine today but I'm hesitating to install it.....please convince me to install it.
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post #2 of 22 (permalink) Old January 6th, 2006, 14:50
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Why wouldn't you want to install it? Mine works fantastic.
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post #3 of 22 (permalink) Old January 6th, 2006, 15:04
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what you mean by grunt box?
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post #4 of 22 (permalink) Old January 6th, 2006, 15:07
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post #5 of 22 (permalink) Old January 6th, 2006, 15:08
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Around 10 usable lb/ft at lower RPMs sounds worth around 130 bucks to me.
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post #6 of 22 (permalink) Old January 6th, 2006, 15:09
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I've heard over and over about it, but is it accounting for the differences in amount of fuel to compensate properly for the lean condition?

IE, if you have on a stock pulley vs a 175mm one, is it still dumping in the same about of fuel?

Is it based on the O2 signal, rpm, TPS, or what exactly to compensate?

Is it learning and adjusting the whole time?

Does it do anything for a stock car? ABV modded stock car with stock pulley? Larger pulley only with ABV mod?
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post #7 of 22 (permalink) Old January 6th, 2006, 15:12
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thank you kind sir for the attached link.
very informative!
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post #8 of 22 (permalink) Old January 6th, 2006, 19:20
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Quote:
Originally Posted by WIWhite87
IE, if you have on a stock pulley vs a 175mm one, is it still dumping in the same about of fuel?

Is it based on the O2 signal, rpm, TPS, or what exactly to compensate?

Is it learning and adjusting the whole time?

Does it do anything for a stock car? ABV modded stock car with stock pulley? Larger pulley only with ABV mod?
1. Yes

2. RPM and TPS

3. No, unless you call turning off and on with the RPM and TPS signal "adjusting".

4. Not unless your stock car is running lean with a stock pulley, which if it is you have other problems you should take car of.



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post #9 of 22 (permalink) Old January 6th, 2006, 23:20
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Originally Posted by kirkosaurus
4. Not unless your stock car is running lean with a stock pulley, which if it is you have other problems you should take car of.
More specifically, your TPS.
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post #10 of 22 (permalink) Old January 7th, 2006, 01:36
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Yes, if you have a big crank pulley, install it
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post #11 of 22 (permalink) Old January 7th, 2006, 22:16
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rino told me that the JDM 4AGZE's don't have the leanout problem and don't need grunt boxes with larger crank pulleys. Is this true? I'm not sure if the grunt boxes fit the JDM engines either.
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post #12 of 22 (permalink) Old January 8th, 2006, 00:16
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well if that is the case i ordered a GB for no reason because i dont have a bigger pulley yet but i bought a GB in case it was the last run of them...i havent heard yes or no whether the JDM motors have the leanout or not...
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post #13 of 22 (permalink) Old January 8th, 2006, 01:04
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Quote:
Originally Posted by MR2Fast2Catch
rino told me that the JDM 4AGZE's don't have the leanout problem and don't need grunt boxes with larger crank pulleys. Is this true? I'm not sure if the grunt boxes fit the JDM engines either.
If you are using the MAP jdm electronics there are different issues alltogether.... Such as the 5500+ lean condition.

The gruntbox, at the moment, is only good for US electronics Big Pulley'd GZEs.

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post #14 of 22 (permalink) Old January 8th, 2006, 03:50
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Does anyone have a large pulley on a JDM 4AGZE? I still want to know how the lean out condition is on one compared the the USDM engine with or without a grunt box.
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post #15 of 22 (permalink) Old January 9th, 2006, 02:31
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hmm...at the risk of sounding like an idiot...which JDM motors had the MAP and whch didnt...i believe mine isnt but i should ask anyways to be safe...whats the other option besides MAP...AFM? i have a GZE from an aw11, and i believe its afm and if thats the case it should have the leanout i would assume...i thought the ae101s used MAP but any clearing up would be HUGE...thanks.
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post #16 of 22 (permalink) Old January 11th, 2006, 01:51
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any answers??
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post #17 of 22 (permalink) Old January 11th, 2006, 07:10
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The only MAP sensor'd GZE's came from the hot-rod JDM Corola's, I think. Do you know what the AFM looks like? It's an aluminum box with a flapper-door inside that measures the incoming air. It will be near your air filter. A map sensored car has a black tube instead that has a small sensor stuck in it.

Look at the first pic in this thread (in the 2nd post):

https://www.mr2oc.com/showthread.php?t=101732

The AFM is the thing just downstream of the filter. Do you have one of those?

Last edited by Grimsby53; January 11th, 2006 at 07:13.
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post #18 of 22 (permalink) Old January 11th, 2006, 14:44
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yeah mine is AFM, i totally spaced on it until i starting thinking about it...because that was one of my problems with my swap was the fact that the AFM needed some tinkering to get the car to stay running...anyways now that thats been figured out does that mean i will need the GB? cuz i just it in the mail the other day.
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post #19 of 22 (permalink) Old January 12th, 2006, 23:51
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Quote:
Originally Posted by MR2Fast2Catch
rino told me that the JDM 4AGZE's don't have the leanout problem and don't need grunt boxes with larger crank pulleys. Is this true? I'm not sure if the grunt boxes fit the JDM engines either.
should have specified jdm aw11 4agze doesn't have the lean out condition not all jdm 4agzes. hope the car is treating you alright.
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post #20 of 22 (permalink) Old January 13th, 2006, 02:20
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jdm aw11 doesnt have the leanout...o man that is some news...i guess i will take your word on it, i do think i will hold onto the GB until i get my pulley in the spring though.
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