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time for some power 

 

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 Post subject: time for some power
Posted: Tue Apr 21, 2009 9:21 pm 
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due to engine f**k up it is time for a rebuild but while im there with the engine in pieces im doing everything i wanted to do before, so im currently thinking

new head
bore block
engine rebuild kit
port and polish
valve springs
vernier gear
nitrous
4.11s

what else would suit for some decent gains and what power figures am i looking at?

 

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 Post subject: Re: time for some power
Posted: Tue Apr 21, 2009 9:32 pm 
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Do you already have a cam i assume? If so then your list is going to give you quite a snappy engine.

I also assume you have an auto? Depending on cam you may benefit from a higher stally (if you dont already have).

Otherwise it'll be pretty good mate.

 

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 Post subject: Re: time for some power
Posted: Tue Apr 21, 2009 9:37 pm 
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yeah, wade cam and a shift-kitted auto, extractors and 2.5inch exhaust...tickford computer and chiptorque chip

 

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 Post subject: Re: time for some power
Posted: Tue Apr 21, 2009 9:39 pm 
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Oh yeah.

So with your planned mods and a retune, it should be quite potent.

Be sure to post results when done, what size shot of nos you plannin?

 

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 Post subject: Re: time for some power
Posted: Tue Apr 21, 2009 9:44 pm 
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was only planning a 50 shot sniper kit but have heard the 175hp shot is a massive kick in the back of the head but not sure about the bottom-end coping...

 

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 Post subject: Re: time for some power
Posted: Tue Apr 21, 2009 9:45 pm 
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even if its an auto, i wouldnt recomend 4.11's for anything resembling a daily driver.

3.45- 3.89 are tops, i honestly wouldnt go (personally) higher than 3.89's unless its intended to be a weekend weapon jobby. I can attest to it, i went with 3.89's (wanted 3.7's but they are so much rarer being from manual r31, whereas the more common auto had the 3.89's).

on the highway at 110 im doing 2500+rpm. and it rises a lot more in proportion to speed than the 3.08's. by 120 ish its close abt 2800 rpm. in its defence my auto may be slipping a bit. but were not sure if or how it effects this reading.

max gear speeds are something like:

1st: 65 ish
2nd: 105 ish
3rd: hits uncorrected speed limit at 135km/h (180 on the dash) somewhere around 3200 rpm

I reckon 4th will do 180 when corrected somewhere around the 4k mark.

when accelerating from a standing start changes 1-2 and 2-3 do not dip below 4k rpm, which is as high as you want it on a long stroke motor that only revs to 5500. it is also where the stock motor even with the extractors and exhaust ive got on isnt really making power. so it neccesitates a cam swap for something more top end.

putting in 4.11's will be wasting the majority of your power band. get 3.7's if you can IMHO.

 

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Last edited by Grimketel on Tue Apr 21, 2009 10:21 pm, edited 1 time in total.

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 Post subject: Re: time for some power
Posted: Tue Apr 21, 2009 9:46 pm 
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If you build it right and don't use it all the time, it'll handle it fine.

Correctly setup systems don't give trouble, as long as the engine is built for it.

 

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 Post subject: Re: time for some power
Posted: Tue Apr 21, 2009 10:00 pm 
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i agree with you grimktel with the 4.11's, but want something unbelieveable off the line and will punch in any gear if given and persuasion.

 

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 Post subject: Re: time for some power
Posted: Tue Apr 21, 2009 10:11 pm 
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Grimketel wrote:
even if its an auto, i wouldnt recomend 4.11's for anything resembling a daily driver.


ive got 4.11's and its still very tame.... since i put the gears in i have a bit of a chuckle when people speak of them being a pig in everyday driving

i get 70kph out of first gear letting the auto shift in normal mode @ 5700rpm. Revs on the highway are 2300rpm @ 100kph...... theres nothing extreme about that at all. In fact after being un-happy with 3.73 behind the auto, and going to 4.11's..... i wouldnt recommend anything but 4.11s now!!

I think it was one of the blokes from RPD cams, said you would need diff like 4.50 to have a similar overall 1st gearing like a manual EF XR6 with 3.45 diff..... something to think about... :wink:
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 Post subject: Re: time for some power
Posted: Tue Apr 21, 2009 10:23 pm 
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thanks Fordfairmont something to seriously think about, how much will the speedo be out by and how do i fix it

 

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 Post subject: Re: time for some power
Posted: Tue Apr 21, 2009 10:26 pm 
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you wire up a speedo corrector as per thread on this site

"changing auto shift points"...... or something similar
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 Post subject: Re: time for some power
Posted: Tue Apr 21, 2009 10:33 pm 
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FordFairmont wrote:
ive got 4.11's and its still very tame.... since i put the gears in i have a bit of a chuckle when people speak of them being a pig in everyday driving

i get 70kph out of first gear letting the auto shift in normal mode @ 5700rpm. Revs on the highway are 2300rpm @ 100kph...... theres nothing extreme about that at all. In fact after being un-happy with 3.73 behind the auto, and going to 4.11's..... i wouldnt recommend anything but 4.11s now!!

I think it was one of the blokes from RPD cams, said you would need diff like 4.50 to have a similar overall 1st gearing like a manual EF XR6 with 3.45 diff..... something to think about... :wink:


it is about what makes you happy at the end of the day, im only trying to put what i thought about my experience with ratio's, if you love 4.11's thats awesome :) is your speedo corrected or are you guesing that speed from first? if its fully 100% corect, then i gues im slipping! damn sloppy gearbox. mine revs at abt the 2200 mark at 100kmh, so the slip must be under load. also your tyre ratio? ive got a set of old ticky 16s on mine, i suppose if your running 18's then that alters the equation. also i think i only ever got about 85kmh 1st with stock gears, yet in my old eb i know i could get 100kmh in first... and that had 3.08's. did au's get a shorter 1st?

personally i wouldnt want a 1st as short as a t5 with 3.45's, it would be over before you could declutch. my bro had the t5 in his ef with 3.08s and it was short enough for me. i i ever get the t5 in, ill most likely swap for 3.23's.

back on topic:

how far are you planning on boring out the cylinders? or is it just a clean up?

 

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 Post subject: Re: time for some power
Posted: Tue Apr 21, 2009 10:48 pm 
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Grimketel, just letting him know what the 4.11's are like, not really wanting a debate.... ive already got a few of those brewing up in other threads lol !!

my speedo is 100% correct and tyres atm are standard 205/65/15. If your running 225/50/16 the revs will be slightly higher.

i was disappointed a little with the 4.11's cause i was kinda hoping for 1st & 2nd to wrap up just as it hit 100kph...... similar to the Xr's (i think)
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 Post subject: Re: time for some power
Posted: Tue Apr 21, 2009 10:58 pm 
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FordFairmont wrote:
Grimketel, just letting him know what the 4.11's are like, not really wanting a debate.... ive already got a few of those brewing up in other threads lol !!

my speedo is 100% correct and tyres atm are standard 205/65/15. If your running 225/50/16 the revs will be slightly higher.

i was disappointed a little with the 4.11's cause i was kinda hoping for 1st & 2nd to wrap up just as it hit 100kph...... similar to the Xr's (i think)


me neither i think we are sending the same smoke signals :D

yeah i got 50/16's.

what do you drop to rpm wise on each gearchange out of interest?

 

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 Post subject: Re: time for some power
Posted: Tue Apr 21, 2009 11:06 pm 
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the change from 1st to 2nd drops to 4200rpm

heres a vid i made recently comparing the 3.7 & 4.11's
http://www.youtube.com/watch?v=zR5EvYtajjU
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