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Replaced top end ef xr8. 

 

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Posted: Wed Sep 05, 2007 1:08 am 
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stavros68 wrote:
so in the 5.6 the T/B is an 82mm is this an overkill??


In that case the engine capacity is large enough to build torque without the need for increased runner length. Hence the large open plenum design which relies on the large t-body to keep the plenum supplied with enough air to make good power.
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Posted: Wed Sep 05, 2007 7:21 pm 
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thanks for the info just about to put a 5.6 soon ,debating what size TB to put 75mm or 80mm
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Posted: Wed Sep 05, 2007 7:44 pm 
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I've given in. The cars booked in to see if the 65mm tb is going to give me abit more power. So in just under 2 weeks i'll find out.
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Posted: Mon Sep 17, 2007 7:44 pm 
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Cars back from the shop with the 75mm still on it. 65mm made 1.6rwkw more but lost power earlier and sharper than the 75mm. At 153kmh the 65mm was down to 135rwkw were the 75mm was at 143rwkw. Maybe my motor is still getting to much air regardless of tb size. Also there was only a 2kw difference between pod in the box and no intake piping/filter at all.
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Posted: Tue Sep 18, 2007 12:19 am 
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Swine wrote:
Cars back from the shop with the 75mm still on it. 65mm made 1.6rwkw more but lost power earlier and sharper than the 75mm. At 153kmh the 65mm was down to 135rwkw were the 75mm was at 143rwkw. Maybe my motor is still getting to much air regardless of tb size. Also there was only a 2kw difference between pod in the box and no intake piping/filter at all.


What about averages?
Lets see the two dyno graphs laid over each other with the torque curves shown. Then I'd like to see 1/4 mile times with the two different t-bodies.
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Posted: Tue Sep 18, 2007 8:57 am 
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So, XR9Ute, based on your earlier post what size throttle body would you recommend for the following package: Ford Racing 342 stroker crate long engine being fitted into an AU3 XR8 auto using the AU3 upper and lower inlet, standard injectors, Tri-Y headers, flash tuner with custom tune. The engine comes with aluminium GT40X heads, X303 cam with 1.6 roller rockers, 10:1 compression. I was going to use the standard 70mm throttle body but maybe I need to look at a 75mm unit, what do you think?
Any estimates on power? When set up in the US running carby etc, Ford Racing estimate 375-385hp flywheel.
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Posted: Tue Sep 18, 2007 3:30 pm 
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Purely because it's a 342 I think you could use a 75. But I'd like to see a better intake like an RPM-II on that engine.

Pete.
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Posted: Wed Sep 19, 2007 8:12 am 
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Thanks for that Pete. The guys budget is stretching hence retaining the standard intake but that might be something I can talk him into later on (when his budget allows). I'll let you know the power and torque figures when we're done (in about 3 or 4 weeks).
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Posted: Wed Sep 19, 2007 7:30 pm 
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I'm not going to try and get any more power out of this set up. Will stay as is untill its rebuilt in 5 to 8 months. After 62 dyno runs and 210000km i think this is the best it will do. Should have alot more potential when it's rebuilt as a 312.
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Posted: Wed Sep 19, 2007 8:18 pm 
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another thing to factor into going too big a TB is you loose small throttle openings driveability ....because as soon as you crack the throttle open it gets a considerably larger gulp of air, which is hard to compensate for....so itdrives like a pig roundtown to gain 2kw top end ???
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Posted: Thu Sep 20, 2007 7:41 am 
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Car drive's no different around town then when it was stock, uses less fuel and its not sluggish when you put your foot down.
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Posted: Thu Sep 20, 2007 8:11 pm 
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well in theory you would think that it would be the case as you want precision control at small throttle openings and the more gradual you increase the airflow the smoother the transmission of power......oh well ,maybe ive got it wrong :wink:
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Posted: Thu Sep 20, 2007 10:00 pm 
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Megasquirt looks after all that. It knows the difference between full throttle and city driving.
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