GolfGTIforum.co.uk
Model specific boards => Golf mk4 => Topic started by: noobdubber on 10 June 2005, 19:02
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I just had the 5hr revo trial. The bloke said that its a 53plate, so it might have the 4 bar already installed, so It'll be a 224 trial and not a 212. Is there any way of finding out if it has one ot not?
Its a big difference, even from the 180bhp standard :grin:
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look on your FPR it is marked on it, 3 or 4 bar.
Don't think you will have a 4 bar tho because if you check out revo's website the claim that the 150 and 180 produce the same final figure
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Both cars come out as 207 bhp, check out http://www.revotechnik.com/products/softwareProduct.aspx?pvID=171.
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Its only a 3 bar!!!
bad in a sense, gonna cost an extra £50
Means I'm gonna get another 17 ponies out of it now though :grin:
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You can get em cheaper than £50, I would'nt count on getting that much more power tho, When mine had just revo and 4 bar, it only made 212 on the rollers. Let us know how you get on
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get an adjustable one and then save up for some bigger injectors... then u should be able to gain more boost..
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where can you get them cheaper than £50?
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http://www.westecperformance.co.uk/ £41 inc Vat
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Thanks for the plug Gaz!
Get yourself a bigger diameter MAF housing and a 4bar reg.
As I recall there are no 1.8T engines that come with a 4bar.
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Whats this bigger diameter maf all about grant :undecided: sounds interesting
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Its something I picked up from Modshack in the states, makes perfect sense, to quote:
Increasing the inner diameter by only .15 of an inch increases the surface area by more than 11%.
When you increase the diameter, the velocity of the air running through it is reduced (even though you're getting more air volume.)
Since the ECU takes it's signals for fueling partially from the MAF sensor, you end up with a lower signal being interpreted by the ECU. ECU sees a lower signal, assumes less air, and reduces fuel.
The reduction in signal from the MAF is directly proportional to the increased surface area of the new diameter MAF housing. This is where the problem arises, but it is correctable.
The ECU will adapt to condidtions by taking downstream readings from the O2 sensors, but only in a very small range.
Increasing the airflow by 11% and reducing the Fuel 11% can only be compensated for for so long, then a lean code is thrown (Multiplicative adaptation exceeds +20%.)
This is where the 4 bar comes in... It squirts more fuel, the O2 sensors adapt to this new condition, and the Adaptation maps come into line somewhere around -4% (rich) which is about where you want them (0% being no correction).
Not tested it myself yet but I will be!
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I'm always availible as a guinea pig grant :grin: