Turbo still not finalised ?

[Rusty]

why you want to use a sport cat??

I can't speak for the Irish system but in the UK, CO requirement for the MOT is <0.3 CO; 100CPI sports cat ~0.25% = , no cats = >0.6% = Things are different before '92, so some 3Bs are OK and run the 3.5% rule .

A sports cat is a small restriction and any restriction or damping of noise can be offset by ditching the centre box. At least with a sports cat it's all legal and will pass an MOT and roadside inspection, without the need to fit the cats back on each year... (or use an MOT tester who is willing to fiddle the test )

[S2central.net]

Dunno about 'down south' but in the North - we have a wacky but great system on emissions... the MOT places decided it takes too long to do full CAT tests at fast idle etc... all they do is normal idle... and the spec for CO2 is 3.5% (maybe tighter on newer petrol cars) - hilariously high so you could pass without CATs on an S2/RS2 no problem.

[mcandmar]

Our tests and limits vary depending on age,

Limit for my 91 CQ20v is 3.5%, car tested at .65% without a cat.

Limit for my 94 Avant is .5%, car tested at 0.01% with a cat.

They also tested the high idle (~3000rpms) on the avant, limit was .3%, tested at 0.03%.

Both myself and David use bolt in cat replacement pipes, 20 minute job to fit them for testing, also keeps them nice and fresh in the shed for when there needed :mischeif:

[Rocco]

I can't speak for the Irish system but in the UK, CO requirement for the MOT is <0.3 CO; 100CPI sports cat ~0.25% = , no cats = >0.6% = Things are different before '92, so some 3Bs are OK and run the 3.5% rule .

A sports cat is a small restriction and any restriction or damping of noise can be offset by ditching the centre box. At least with a sports cat it's all legal and will pass an MOT and roadside inspection, without the need to fit the cats back on each year... (or use an MOT tester who is willing to fiddle the test )

hi Andy

in Spain i think the limit is 0.5 CO ..and i dd 0.49 or something like this... the last 3 years.

and lambda 1 is normal true?

[macspring]

Ross,

what's the k 26/27 like and why are you changing it ?

Thanks.

[prj]

K26/K27 with #8 housing is usually ~4000 rpm full boost in 3rd and when mapped properly 420-ish hp.

[Rusty]

Our tests and limits vary depending on age,

Limit for my 91 CQ20v is 3.5%, car tested at .65% without a cat.

Limit for my 94 Avant is .5%, car tested at 0.01% with a cat.

They also tested the high idle (~3000rpms) on the avant, limit was .3%, tested at 0.03%.

Both myself and David use bolt in cat replacement pipes, 20 minute job to fit them for testing, also keeps them nice and fresh in the shed for when there needed :mischeif:

Yes, fast idle test is the one.

[Ross]

As per PM my K26/7 has the lag but doesn't quite deliver on the power. Forget 420hp, more like 380 and perhaps 400 if pushed. Max boost ~3900rpm.

Prj, I think the problem here is that finding two identical K26/7 is difficult. I think it's been proven that the figures you quote are spot on for a newer one though.

That's why I am changing it - the little extra up top is not worth the trade in lag for me. Now for 420hp - I could continue to live with 4,000rpm.

[macspring]

After re reading this thread and my two others about turbo choices, I've learnt a bit more.

I know I keep changing my mind, but only want to buy the turbo once. Will now be fitting a 3"inch downpipe rather than an RS2 one.

The kkk 26/27 seems like it might be too laggy for me, and so now thinking of this one ?

http://www.034motorsport.com/turbochargers-and-accessories-kkk-hybrids-k26gt2871-turbocharger-p-321.html

What do people think, has anyone got it fitted ?

Thanks for the feedback to date, and any further comments.

Regards.

[diesel des]

Right, deside what HP you want or "need". Be realistic. Buy the smallest turbo that will do that power. Or if you want to spend time on the track pick a turbo 50hp larger. More HP ALWAYS pushes boost startup upwards. This is where $$$ can help. A ball bearing turbo speeds up response a little.

Get a run in a car close to the HP you are looking at. The map 034 show for the 2871 is for the 48 trim, but they shiped me a 56 trim. This compressor is exactly the same as a 3071r, do just a comp housing change let's you use its comp map. That's what I run. Remember, I'm 15 miles on then north side of the border if you need a demo....

[macspring]

Des,

Thanks for your interest. Will pm you soon to arrange a date for a ride in yours. Very much appreciate the offer. I know macanmar would be interested too as he is just behind me in the preparation of his engine. I'm the guinea pig.

Would like an easy 400 bhp at the crank everyday of the week for a few years without having to worry about it or look at it again, with very early spool and good torque, ultimate power is not a priority as it is rare enough to go over 5k in everyday driving.

Don't quite yet fully understand the significance of the various choice of trims.

Will never be tracked.

Thanks.

[diesel des]

Well a 2871r will do a real genuine 400 HP on a stock internal engine easy. If you have the right other obvious bits eg manifold, exhaust, injectors and intercooler etc. The smaller unit, s gt 2860rs would be over worked by q fair bit, so the 2871 is your best choice.
A kkk from a focus rs would get you close too. But its smaller. Think of rs2 power with a bit less lag.

The outright best turbo is a new efr kkk turbo. But its big cash and needs special manifolds. Pm me for contact details... Des

[JP]

Personally I'd never buy an 034 turbo again after my one had to be rebuild after less than 600miles. Paid extra for a warranty report never got the money back for rebuild or report. All because the turbos come with internal wastegate heatshield cores rather than external and they rub against the blades.

[prj]

Huge waste of money with the 2871R if you are on a stock car.
I would just go K26/K27 or a K24-7400, because it will be a lot cheaper..

If going for a T3 manifold, doing rods etc, then I'd go no smaller than a 3076R/0.82 or HX35 Super with larger hotside.

There is a question about "bang for the buck", and a 2871R delivers little compared to say a K26/K27, which bolts right on.
Also, with the bigger turbos you just drop down a gear compared to stock.

With a 2871R, it won't quite spool early enough, so you will be forced to drop down a gear compared to stock turbo anyway. Might as well go bigger and get a 3071, there will be very little difference to how you drive.

[Thuppu]

Holset is used in heavy industrial machines/engines so propably they are quite reliable and they can be overhauled with small money. How early spool do you want on a 500hp engine? http://koti.mbnet.fi/pro-ht/Audi_URS...super_dyno.pdf