thats huge in comparison! is it a straight bolt-on swap? altho i guess my standard hose wouldn't go over that. and can the TPS be swapped between the two?
Yup, we defo need more info on this swap please.
http://www.airbrushartists.org/Gal72..._s_Gallery.asp
Currently rocking Volvo's finest V70R 2WD Manual
Previous cars:
1996 855 T5 (Ex Police),1996 854 T5,1996 855 T5,1995 855 Black T-5R,1996 960,1997 855 R
it does take quite alot of the slow speed drivability out of it, very jerky at around town speeds. I fitted the enlarged MAF, enlarged reverse flow kit & new cone filter at the same time so can't confirm what made the most difference out of the lot (but i do know i like it )
[ame]http://www.youtube.com/watch?v=3rQAYXfmhco[/ame]
Nice brake squeel there Duane lol somebody didn't copper grease them bad boys up properly lol
lol
nice vid fandango, should of given it a bit more tho :p lol, glad to see im not the only who has a loose led/alarm thingy on the dash.
Last edited by p fandango; Monday 5th January 2009 at 07:14.
IMHO the enlarged throttle body is not required until you are flowing LOTS of air, like 500+ bhp. The std bore throttle gives excellent drivability and very good flow, if you absolutly have to you can smooth off the tiny bolts that hold the butterfly in position, that will help keep the air slightly more laminar and less turbulant but it really wont make much difference. As duane said the larger throttle makes things jerky and makes the throttle more of a switch. it will also mess up your fuelling at part throttle because the throttle is letting in much more air for any given degree of throttle movement. You could be at 100% flow at 60-70% throttle opening with a throttle that big, yet the ECU would only see it as 60-70% of max flow and therefore only fuel for that causing it to run erratically etc etc. But the RIP setup i think is worth doing, colder is better.
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i don't know the theory side of much engineering (& tbh prefer trial & error & find out for myself) but there are a few things baffling me there
you say the 55mm standard throttle body would be enough to flow 500bhp, yet weren't happy with your canistor filter because it would strangle the engine!!
i agree the throttle is opening sooner because of the bigger butterfly, but the ECU will still measure the correct amount of air being used from the MAF. Even with the bigger opening won't the engine only use the amount of air it needs? The standard ECU is very adaptive & learns what is going on from other sensors. I'm running a totally standard ECU & when fresh won't even tick-over my engine, after every crank the ECU trys different settings & now runs fineAs duane said the larger throttle makes things jerky and makes the throttle more of a switch. it will also mess up your fuelling at part throttle because the throttle is letting in much more air for any given degree of throttle movement. You could be at 100% flow at 60-70% throttle opening with a throttle that big, yet the ECU would only see it as 60-70% of max flow and therefore only fuel for that causing it to run erratically etc etc. But the RIP setup i think is worth doing, colder is better.
as i said i already had the reverse flow, & just upgrading to 3" pipe & the throttle body has made enough of difference i can feel that i want to get it re-dyno'd because i'm expecting a 5-10bhp increase (which i don't believe is solely down to the pipework)
The canister filter was tiny and would not flow anywhere near enough as the throttle body can, yes the engine will suck in the same amount of air but at a lower throttle opening with the bigger throttle, ie it needs less opening to flow the same amountso the TPS reading will be low for that given amount of air and therefore the fuelling and ign timing will be out, maybe not by an auful lot but it will be out.
The standard throttle body is plenty big enough for a street motor with lots of power.
Low cost auto diagnostics, prestige car specialists, mobile service in Staffordshire.
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what i was trying to point out tho is that the map position isn't just figured out from the TPS overwise they wouldn't of bothered fitting a MAF sensor, the axis on the maps i've seen were labelled "load" & "rpm"
And to calculate the load the ECU will use TPS as a multiplier in the fuelling algorithms. so your fuelling will be out.
Low cost auto diagnostics, prestige car specialists, mobile service in Staffordshire.
www.mobilediagnosticservices.co.uk
If anyone wants - I can get on a train and fetch to Birmingham any kits you'd like from ET. It's about an hour by train from Den Haag. Small stuff like intercooler pipes will fit quiet easily into my hand luggage and I do return regularly to the UK
Last edited by Wobbly Dave; Friday 9th January 2009 at 10:43.
Volvo ABS ECU Repair
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@ wobbly dave,you're letting yourself in for quite a haul,you'll be inundated with requests now, '' can you bring me lights with you'' etc
945 - being fettled
nissan cube -
Ok guys, think what you like about the throttle body, its your own call
Low cost auto diagnostics, prestige car specialists, mobile service in Staffordshire.
www.mobilediagnosticservices.co.uk
so long as things are not too large or heavy - I can usually oblige. I guess the major question is - which is cheaper and more convenient. I have a feeling that TNT post will work out better in most cases. I can only carry up to 10Kg and a certain size on as hand luggage - plus no liquids more than 100ml. I wouldnt really wish to have checked luggage if possible.
Volvo ABS ECU Repair
Join my projecteers tribe - Old Volvos Never Die - They just get faster.
Visit my VPCUK garage and my YouTube channel - WobblyDave72
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