ok thanx matt it is a nice bit of kit one thing about imposs they are prompt with there stuff always next day
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ATP GT2871R Build with pics
- Thread starter cupra_matt
- Start date
T25 flange aint round dude... its just off square.
JS flange base was cast to include T25/T3 flange 4 bolt drilling, but the apatures are different shapes obviously.
and you wonder why looking at the pictures...
jeez.... you could make that yourself for £80 in parts
Good luck.
HarveyGTI
Guest
indeed, you get what you pay for
personally I would not cut corners in terms of quality and therefore save the £1000 to purchase the decent equal length manifold
will that manifold actually last long before cracking with the amount of power you will be putting through it Matt?
rody100
Guest
New oil pick up pipe on.
Sump refitted.
Finished on the car for today, bumper on and bonnet down ready too push out in the morning.
My other car, ( well the wifes car)
A wee bit of grinding.
DOH
They have only shipped me 7 exhaust valves. Now gotta wait for another to come.
thats it for todays activities.
I was gonna do fuel pump today but i have cut my fingers really badly, and petrol and cuts = mahoosive stinging, and i tell thee pain is no friend of mine.
dou you have picture of fuel pump ??????????????
poor aspects of that design being no merge collector of any sorts.... cyl3 fires straight out into turbo, across cyl 4 & 1,2 which effectively fire at each other.
function in high gas speeds and airflows and this is all -ve to performance on a BT setup.
HarveyGTI
Guest
so just to understand that as 3rd cyl firig straight onto the turbo would result in staggered or an ineffcient type of airflow?
being a novice, I am guessing all 4 cyl's should be firing onto the turbo at the same time.....hence this is what an equal length mani does right? and the merge collector would sit more central?
form what i understood from turbos (which is not a lot so correct me if im wrong) is when a manifold is made to connect to a turbo, the manifold is made in such a way that (for this example the engine fires cly1, cly4, cly2 then cly3)
cly1 exhaust gasses would reach the turbo first, then cly4, then cly2, then cly3 all in equal 'timing' then it would carry on that sequence. so basically the turbo is always having a constant push from the exhaust gasses and there are no moments where the turbo is not revicing exhaust gasses.
adam...but if the gases from each cyl have different distance to travel before getting to turbo then they will not arrive in a smooth pattern/time
Well it didn't turn up today 
Bill, i appreciate what your saying and fully agree, but the funds wont allow a full equal length manifold at the minute.
I will be getting one as soon as the wife forgets how much i have spent and after i have been on holiday.
It should be fine for now though shouldn't it, wont the make the power a equal length one will but shouldn't cause problems? cant be any worse than the ATP one.
Its a Impossible Performance manifold,
I have just had a email from Backdraft motorsport showing there cast mani which is top mount and looks a little better, will see if this one fits first, if not i will backdrafts.
Backdraft mani can be seen here. http://www.backdraftmotorsport.com/services/tuning-parts-and-services/techincal-spec
Bill, i appreciate what your saying and fully agree, but the funds wont allow a full equal length manifold at the minute.
I will be getting one as soon as the wife forgets how much i have spent and after i have been on holiday.
It should be fine for now though shouldn't it, wont the make the power a equal length one will but shouldn't cause problems? cant be any worse than the ATP one.
Its a Impossible Performance manifold,
I have just had a email from Backdraft motorsport showing there cast mani which is top mount and looks a little better, will see if this one fits first, if not i will backdrafts.
Backdraft mani can be seen here. http://www.backdraftmotorsport.com/services/tuning-parts-and-services/techincal-spec
Last edited:
HarveyGTI
Guest
thats what i kinda meant, the gasses from each cylinder have to arrive in a smooth pattern so you dont get a 'quiet period' where the turbo does not have a 'push'.
i kinda did say that in this bit
adam said:
Well it didn't turn up today
Bill, i appreciate what your saying and fully agree, but the funds wont allow a full equal length manifold at the minute.
I will be getting one as soon as the wife forgets how much i have spent and after i have been on holiday.
It should be fine for now though shouldn't it, wont the make the power a equal length one will but shouldn't cause problems? cant be any worse than the ATP one.
Its a Impossible Performance manifold,
I have just had a email from Backdraft motorsport showing there cast mani which is top mount and looks a little better, will see if this one fits first, if not i will backdrafts.
Backdraft mani can be seen here. http://www.backdraftmotorsport.com/services/tuning-parts-and-services/techincal-spec
matt the courier company had a bomb scare hence why it didnt turn up as im in same boat to fella should be tom or sat
yes there is pulse tuning, which is what you are eluding to, but crank up the cylinder discharge cycle also (non fired - well wasted fired) and add the high rpms for actual gas speed's and the uneven path the respective cylinders have, they will not coincide, but collide = loss of energy and effeciency.
Remembering people are wanting BT's for more power, and more airflow.
It will work (may well crack on the flange length however) for joining gas streams together, but is a crude poor design none the less.
I understand why its being looked at, but it will want to be replaced I guarantee at a later date. Buy cheap buy twice is the addage which springs to mind.
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