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        General >> Off Topic Subjects >> Crazy Remapping
        
(Message started by: JohnJ on Apr 26^th, 2006, 10:20pm)

Title: Crazy Remapping
Post by JohnJ on Apr 26^th, 2006, 10:20pm

My mate got his VW Passat PD 105bhp oil burner remapped last week and let me drive it.

Wooohoooaaahha holy s hite.

It went from 105bhp to a whopping 168bhp its just madness!.

I started off and the turbo was just deafening, it was screaming away and we were not even moving then I pulled off,

1st gear and nothing special there until I got to 1500rmp and the front tires started screaming and smoke everywhere on dry tar.

2nd gear and tires started spinning again. to get that much power out of a 1.9 diesel is just unbelievable the car got to 60 in about 7 seconds. This is hard to believe so he showed me a print out from the rolling road test it was put through so it all fact.

I’m not expecting that engine to last long.

JJ

Title: Re: Crazy Remapping
Post by cossie_al on Apr 27^th, 2006, 12:36pm

on 04/26/06 at 22:20:33, JohnJ wrote:

I’m not expecting that engine to last long.

[]
My Money is on the turbo self distructing first
A couple of my mates have dabbled with remaps but after a short while both reverted back to standard because of worries over reliability
s'pose its okay if you can afford to replace engines and turbos on a regular basis

Title: Re: Crazy Remapping
Post by lonesomecajun on Apr 27^th, 2006, 4:33pm

Had a couple of Volvo T5's remapped from 225 and 240 up to 310bhp - doesn't seem to affect reliability- even the Manufacturers warranty is still valid.

'' I started off and the turbo was just deafening, it was screaming away and we were not even moving then I pulled off"

Don't understand that statement at all as Turbos do not spool up from tickover so would be making no discernable noise at all when you start it up, even when mine is at full song the turbo itself hardly makes any noise.

Title: Re: Crazy Remapping
Post by JohnJ on Apr 28^th, 2006, 5:35pm

Forgot to mention I was giving it a rev or two, and it was making a noise, well more then mine, alot more then I was use to.

Title: Re: Crazy Remapping
Post by scorpio_man on Apr 28^th, 2006, 7:48pm

hi there

mind it is a tdi! ;) ;D

Title: Re: Crazy Remapping
Post by invernessguy on Apr 28^th, 2006, 9:39pm

my friend used to sell a lot of volvo turbos, 'privately' and the trick he used on each and every one of them, whick would probably work on any turbo car, but its really not recommended, was to turn the actuator for the wastegate a few turns, so the turbo was kicking in much earlier, just above idle, round about 1000 revs. This seemed to make a big difference to the power, and made the car feel faster (dont know about the long term effects, etc)

donnie

Title: Re: Crazy Remapping
Post by sector-9 on Apr 29^th, 2006, 2:35pm

Ummm, winding back the wastegate adjuster wouldn't make the turbo come in earlier. What it would do is increase the pressure at which the wastegate (which is a bypass valve to protect the engine & turbo) operates. It's an easy adjustment to make and can have a noticeable effect on engine power, provided the fuelling is also increased to match - but it will also increase engine temperature which is generally a bad thing.

If you need a turbo that starts working lower down the rev range then you need a smaller one, which limits top end performance, or the new variable-geometry type. Keeping the pipework and stuff between the turbo and inlet manifold to a minimum will also reduce turbo lag.

Darren

Title: Re: Crazy Remapping
Post by JohnJ on May 3^rd, 2006, 7:13pm

Well how did ford do it in the New Mondeos, they have a clever box of electronics mounted on the top of the turbo which has eliminated turbo lag completely and I'm sure VW have gone in the same direction, my TDCi does not have this extra wiring and thus has got the turbo lag, my colleague has a new type turbo arrangement in his TDci and has no turbo lag, I drove it and it more or les has power from the start. So it would be fair to state that there is some sort of electronic motor acting as a supercharger (maybe) keeping the turbo spinning to limmit lag. It does look strange compared to mine. I hoestly dont know what its for but it would be nice to know.

JJ

Title: Re: Crazy Remapping
Post by Octavian_P on May 3^rd, 2006, 8:40pm

There can't be an electric motor for the turbo, the new turbine (with electronics) is referd to as an "geometry variable turbine". This should mean that at lower rpm, the propeler blades somehow get more surface to act thuss giving a bit o pressure, as the speed increases the blades should get less surface and decrease eficency. Well i don't know if that is 100% corectly but it's something like that.

Title: Re: Crazy Remapping
Post by JohnJ on May 3^rd, 2006, 9:13pm

Well we are getting there!! ;D

Title: Re: Crazy Remapping
Post by mr._floppy on May 3^rd, 2006, 9:38pm

I don't know what the ruddy hell you're all talking about :-* , but it sounds fascinating ;D

Title: Re: Crazy Remapping
Post by sector-9 on May 4^th, 2006, 11:16pm

Probably works in a similar way (but in reverse) to variable pitch propellers on an aeroplane. Basically you keep the revs more or less constant but change the angle of the blades so that they move more or less air at any given speed. Obviously the more air being moved, the more power it takes to do so without the revs dropping...

Darren

Title: Re: Crazy Remapping
Post by JohnJ on May 5^th, 2006, 8:03am

Thats a good explanation!, so its good at low and high revs, a bit like a helicopter but incredably complicated. ;D

Title: Re: Crazy Remapping
Post by martin_rowe on May 5^th, 2006, 8:47am

usually works with a variable ventury inside the turbo, instead of a waste gate, reduces lag & gives more controlable boost, had it on trucks for a while now.