K24 7400 installation in S2 3B

[Vorsprung durch Technik]

Alright gents.

The Volvo turbo now pulls so strong from any rpm and smoothly with no hesitation like it was previously, every gear has so much thrust i'm most impressed.

I've taken a couple of the lads out for a spin also who were equally impressed with the go in it.

I'm delighted!!!

Well done fella, i'm really pleased for you!!

[gmac78]

Alright gents.

S2 has been off the road for months now, been sourcing a metal sunroof, stripping out headliner, ordering new material to trim it, sourcing a new aerial, fixing my sluggish wipers, replacing MAF pins and fitting another lambda sensor, oh, and waiting to get a new windscreen fitted since the headliner is still out.

I fitted a new lambda on it when i first bought the car 8 years ago, which i purchased from Dingbro. I thought nothing more about it until i went to order another one from lambdapower due to damaging the last one, only to find out it's been the wrong lambda in it for the last 8years!! It was an NTK make. The correct bosch one for the car along with new MAF pins has made an incredible difference.

Last night i went for a spin after fitting the new lambda and MAF pins and the car goes like it has never gone before.

The Volvo turbo which i fitted a few months back was a bit underwheling but know i know why. These MAF pins were the problem all along as well as not having the correct lambda.

The Volvo turbo now pulls so strong from any rpm and smoothly with no hesitation like it was previously, every gear has so much thrust i'm most impressed.

I've taken a couple of the lads out for a spin also who were equally impressed with the go in it.

I'm delighted!!!

[varia]

I could see the cold side originally and after your comment above went back to see the +19 photos. All good cheers and great photos. If it weighs 4 grams less i would suspect it's worthwhile as it could be a 10% improvement over the stock wheel if you do the math. I wonder what the original one weighs? Be good to know, however if your going to do this you might as well do it right the once and be done with it so i'll be doing exactly the same as you by the looks of it.

Well i bought mine of Andy10v so i'd seriously doubt it's damaged, tbh, but like you i haven't checked but i was always of the opinion that i would go for a 360 bearing for longevity and a billet wheel so wasn't bothered really. I'm just wondering now why varia says a machined K24 hotside is better than a Porsche K26/6 ?

I thought about the RS2 turbo but it just doesn't suite what i'm after hence why i bought the K24 7400. That price you mentioned was that £600 all in inc the wheel?

David (hybrid_hatch or Ruffiano)
https://www.s2forum.com/forum/techni...di-application

Who actually pioneered this volvo turbo thing with Hank's help.
" it was my car that had them both. the 26/6 doesn't perfectly match the profile of the 7400 turbine, it matches it at the end, but not throughout. machining a k24 to match it perfectly means it is more efficient, its not letting extra air through without taking the force from it"

[gmac78]

I can't actually remember what hotside i bought now it's been so long, i'd need to get the part numbers. Do you think that's the correct one? I remember Andy buying a hotside that was too big, have you tried it on the turbo for fitment?

[Vorsprung durch Technik]

I've got the Porsche K26 / 6.

[gmac78]

What hotside did you get?

[Vorsprung durch Technik]

Thanks for the pricing and general info it's much appreciated, i'm very tempted to just go ahead and get mine done although what's holding me back is uncertainty of the hotside for now. I'll be going for a custom 3" down pipe to keep egt in check so by the time it gets finished the wallet will be hurting. Still if i get the 7400 part of it done i'll be a step closer and hearing how you get on will make a big difference! Thanks for the offer of the Cobra head, when the time comes i'll let you know. Cheers Mark.

[gmac78]

Yeh it was around the £600, infact it was cheaper than that slightly, i think £580ish but that was for everything including delivery.

Just looked back through my emails from them, here are the two pricings

1. Standard rebuild- We can repair with billet and standard bearings and seals for £400 + vat plus shipping

2. Upgraded rebuild- We can repair the unit with a Billet wheel, competition bearings and seals, 360 thrust bearing.

£450 + Vat, plus £30 + Vat carriage

All their Hybrid, performance and modified turbos do not have a warranty but this seems to be the norm looking at other Turbo companies.

I spoke to a technician who does the rebuilds and when i mentioned that the chips i have were rated for around 1.7bar he strongly suggested i opt for upgraded option. Very little difference in price really so a no brainer.

It's amazing how quiet a newly refurbed turbo sounds, very little whistling compared to other turbos i've heard!

In your application the engine bay will be more spacious so may very well get off with a different intake setup.

I've still got a 3" Cobra head if you want to try that when the time comes?

Cheers

[Vorsprung durch Technik]

I could see the cold side originally and after your comment above went back to see the +19 photos. All good cheers and great photos. If it weighs 4 grams less i would suspect it's worthwhile as it could be a 10% improvement over the stock wheel if you do the math. I wonder what the original one weighs? Be good to know, however if your going to do this you might as well do it right the once and be done with it so i'll be doing exactly the same as you by the looks of it.

Well i bought mine of Andy10v so i'd seriously doubt it's damaged, tbh, but like you i haven't checked but i was always of the opinion that i would go for a 360 bearing for longevity and a billet wheel so wasn't bothered really. I'm just wondering now why varia says a machined K24 hotside is better than a Porsche K26/6 ?

I thought about the RS2 turbo but it just doesn't suite what i'm after hence why i bought the K24 7400. That price you mentioned was that £600 all in inc the wheel?

[gmac78]

Vorsprung- Did you see the pics of the billet wheel at the start of this post. Basically a replacement OEM compressor wheel was not available which is why i went down the road of a billet version. I asked them to weigh the original and compare against the billet, the billet was 4g less if memory serves me. Not sure how much of a difference that would make to spool but it comes on quick, very responsive compared to the RS2 turbo. However i would have been running a tooth on the timing when i had the RS2 turbo installed so a bit annoyed i didn't sample it with the engine running properly. Easy enough to fit again if i feel the need.

Turbo Technics gave me the name of the company they use to supply these billet wheels, for the life of me i can't rem what they were called now. An American company i think. Is the turbo you have damaged?

[Vorsprung durch Technik]

K26 #6 can be used but not that great as the machined k24

https://www.flickr.com/photos/quattr...57664930622196

Whats the reason for that?

[_ShurikeN]

Nice job!
I was meaning

compressor housing

also.

[varia]

Thanks for sharing useful photos. There is also an option if you don't want to use stock Volvo internal bypass: old audi K24 or K26 compressor housing can be machined to work with 7400 compressor wheel. In this case the turbo will look just like stock audi one. But Volvo 7400 compressor housing may have a better design in terms of effectiveness.

K26 #6 can be used but not that great as the machined k24

https://www.flickr.com/photos/quattr...57664930622196

[Vorsprung durch Technik]

Big thanks for sharing all the info and links you have with us and a big well done for going ahead with it!! I'm anticipating your waste gate plug arrival with serious interest to know the outcome.

Do you have any pics of the Turbo technics supplied Billet wheel as it was fitted to the cold side? I'm just interested in doing thew same as you and would like to know the latest on billet wheels for these Volvo 7400 turbos?

[_ShurikeN]

Thanks for sharing useful photos. There is also an option if you don't want to use stock Volvo internal bypass: old audi K24 or K26 compressor housing can be machined to work with 7400 compressor wheel. In this case the turbo will look just like stock audi one. But Volvo 7400 compressor housing may have a better design in terms of effectiveness.