Volvo K24 turbo in audi application.

[prj]

I am assuming a couple of things, not necessarily mandatory, but which do no harm to a standard ABY anyway, and are not that excessive and which would help to get the best out of the "new" K24 7400, the fitting of an RS2 intercooler, RS2 injectors or similar, an RS2 exhaust manifold, an RS2 downpipe. oem rods retained.

RS2 Manifold, RS2 injectors (or bigger) are mandatory.
Downpipe ... well, I don't think you would lose more than 10hp from using the stock one, same goes for the intercooler - obviously bigger is better, but again, very much hassle for little gains at this point. Better to fit water-methanol injection. You will also need to at the very least gut the cats in the stock exhaust, or if going catless is not an option, then you'll need to get an exhaust made.

A custom rubber/silicone pipe from someone who makes up a suitable batch to allow the output pipe of the turbo to be connected to the inlet pipe of the intercooler without having to cut 'n shut the metal output pipe of the 7400 as per this thread.

This is the only disadvantage - you'll have to get the intake fabbed up.

Not sure if I've forgotten anything, or should one just go the more normal/easier route and buy a decent reconditioned RS2 K24 7200 for an easier no hassle life, i.e. bolt it on in an even easier manner, ADU chips already on the shelf, only disadvantages being the higher cost of the RS2 turbo and the slower spool?

I'll make some chips specifically for this as well, and I'll give them to Paul, etc...
ADU chips will work too to some extent, but will have incorrect mapping for the fast pressure rise in the lower end, so might knock.

and will be more dangerous the k24 7400 than the 7200?? because faster spool + high torque,could be more chance of banana rods??

more or less like we use a harder wastegate spring with RS2 turbo.. or not?

As long as you don't knock HARD on either turbo, your rods will be fine.

[Rocco]

and will be more dangerous the k24 7400 than the 7200?? because faster spool + high torque,could be more chance of banana rods??

more or less like we use a harder wastegate spring with RS2 turbo.. or not?

[macspring]

Waits to be flamed, but

for a person who can't appreciate the different lines on the graphs in this thread, but has a butt dyno, does this thread to date mean the following?

People with ABY's should get a s/h K24 7400 turbo from a dead 2002+ Volvo S60R / S70R, remove the diaphragm thing bolted onto the outside of the turbo, put a blanking plate on the internal wastegate (Bambridge ?), take off the original oem K24 7000, bolt on the new Volvo with no hassle, get a suitable new chip from S2Central and we'd then have a turbo with the spool of the ABY, the poke of the ADU, and all for the cost of a second hand turbo from a breakers yard?

I am assuming a couple of things, not necessarily mandatory, but which do no harm to a standard ABY anyway, and are not that excessive and which would help to get the best out of the "new" K24 7400, the fitting of an RS2 intercooler, RS2 injectors or similar, an RS2 exhaust manifold, an RS2 downpipe. oem rods retained.

A custom rubber/silicone pipe from someone who makes up a suitable batch to allow the output pipe of the turbo to be connected to the inlet pipe of the intercooler without having to cut 'n shut the metal output pipe of the 7400 as per this thread.

Not sure if I've forgotten anything, or should one just go the more normal/easier route and buy a decent reconditioned RS2 K24 7200 for an easier no hassle life, i.e. bolt it on in an even easier manner, ADU chips already on the shelf, only disadvantages being the higher cost of the RS2 turbo and the slower spool?

What have I missed out on with either option ?

Thanks.

[Ruffiano]

Here is how i see it. you can buy the turbo for half the cost of an rs2 unit (brand new), it bolts right in so no need for custom exhaust manifolds or downpipes, it runs with all the stock oil and water lines, and it makes just as much if not more power then the rs2 turbo and it makes that power sooner. In my book it is a no brainer.

[prj]

So basically, the K24-7400 is a great little turbo.
Spool is similar to stock, and power similar to K24-7200. Shows how much turbo technology has advanced in recent years.

I am very happy that there is now another upgrade path over the usual "fit RS2 turbo or forget it" stuff.
I'll make sure there are chipsets available for Motronic for this as well. A car with the K24-7400 makes a great daily driver in a town with small speed limits, such as mine.

[Ruffiano]

My bad. Hap is UrS4guy. I saw the "Ur" and the "guy" part of UrQguy and missed the "Q" part.

Can't necessarily disagree with your K24-7000, vs K24-7200 vs K24-7400 spooling comments. That said, it would have been nice (wishful thinking) to see a K24-7200'd AAN on the same dyno on the same day as the other two plots. BUT then we get into the cam issues and it all gets muddled anyway.

we also get into an intake and intercooler debate as well. according to bench testing from 034 the aan intake manifold out flowed every oem intake. the intake on my car flowed the worst out of all of them, even worse then the 3b intake manifold.

[UrS4boy]

This is Hank, not Hap, but I am flattered to be mistaken for him Hank

My bad. Hap is UrS4guy. I saw the "Ur" and the "guy" part of UrQguy and missed the "Q" part.

Can't necessarily disagree with your K24-7000, vs K24-7200 vs K24-7400 spooling comments. That said, it would have been nice (wishful thinking) to see a K24-7200'd AAN on the same dyno on the same day as the other two plots. BUT then we get into the cam issues and it all gets muddled anyway.

[URQguy]

SO what you are saying is that you need to put the 3b cams back in and head back for a spool comparison?

Aaron is trailering his 2.0L CQ to vegas and is thinking of doing some tunning at ours truely.

[Ruffiano]

Another point, Chris also mentioned the fact that i am running 7A cams, he is running 3b cams. the accepted theory of this is that the 7A cams show a LOSS in power at lower RPMs but gain more up top.

[URQguy]

Hap: I wasn't trying to compare absolute numbers, just the general shapes of the two curves. I know that you can not compare numbers from one dyno to another, not even for the same car, and certainly not from different cars on different dynos on different days at different elevations. It would have been nice to have seen an RS2'd AAN on that dyno on the same day as Ruffiano's (Dave's) e//S2 to compare K24-7400 to K24-7200.

This is Hank, not Hap, but I am flattered to be mistaken for him

It would have been nice to compare an rs2 k24-7200 on the same day, but honestly, it isn't needed. The overlay that Chris posted shows that the 7400 spools almost identical to the k24 7000, and makes rs2 power or more. THe k24 7200 fails to spool identical to a regular k24, so is there a comparison?

Hank

[MrVain]

What hotside do you use?

[Ruffiano]

My engine bay:


Also the car that had that overlay has the same intake manifold, and same intercooler, but does have a LWFW and 3" downpipe and 3" exhaust.

[Billman]

his is chipped, and no, i did not log while dynoing.... i had my 16month old son with me and sort of had my hands full.


and yes, i actually have the maf installed, but not using it, it is being used as a 3" coupler.

make a full throttle log in 3rd gear as on the dyno.

[UrS4boy]

You are comparing apple to oranges. What did a stock b7 rs4 pull on the same day as that AAN you posted? If you do not have a benchmark, they are just numbers.

Hap: I wasn't trying to compare absolute numbers, just the general shapes of the two curves. I know that you can not compare numbers from one dyno to another, not even for the same car, and certainly not from different cars on different dynos on different days at different elevations. It would have been nice to have seen an RS2'd AAN on that dyno on the same day as Ruffiano's (Dave's) e//S2 to compare K24-7400 to K24-7200.

[Ruffiano]

is it stock S2 or a chipped one? If not maybe it is better to compare it with one of pauls homefries as maybe is there something to gain spoolwise. Apart from it I dont know if Ruffiano is using MAF or the stock plumbing in general thus having less restriction on the intake path that can cause pressure drop and affect spool.

However it seems that this K24 7400 is a fine alternative to the unreasonably priced k24-7200.

@Ruffiano
Did you made any VEMS-log while on the dyno?

his is chipped, and no, i did not log while dynoing.... i had my 16month old son with me and sort of had my hands full.


and yes, i actually have the maf installed, but not using it, it is being used as a 3" coupler.