Garrett or IHI

[Madmile]

Is is worth changing a turbo out for 20/30bhp?

It is if the same turbo makes another 70bhp than the other at the limiter. There only may be a peak of 30-40bhp its the space under the line that counts.


Look at the links between CC's car and Bills look what each car makes at 7800rpm. Its not 20-30bhp the vf34 is on its arse.

 

[Casper]

Is is worth changing a turbo out for 20/30bhp?

That's what have i been asking myself lately Just the ko4r fails after 5500 rpm straight on the face where 28rs could go nicely past 7000. The drivability is not so good with the k04r since the torque comes in too brutaly and is not so good for track driving. I am satisfied with my setup as it is but would like to try sth. else with a bit more progressive power/ torque buildup and a couple of more horses -the 28rs seems perfect for the job, also considering the price which isn't too steep IMO.

 

[Madmile]

Actually its more like 90bhp at the redline at the fly.

 

[caney]

Is is worth changing a turbo out for 20/30bhp?

that's my dilemma ryan

 

[caney]

Actually its more like 90bhp at the redline at the fly.

ah ok so it's more about more bhp higher up the revs?

 

[Casper]

@ Gary; Jup it is all about the area under the curve not just the peak values. Mine peaks @ 5386rpm with 302,6hp but before the 7200rpm line there are available around 260hp. Wonder how much more hp would it be with the 28rs at the 7200 line.

 

[YerMother]

Casper what boost is your k04R holding at 7,000rpm?

 

[Casper]

Exactly 1 bar.

 

[YerMother]

Hmm.. My standard k04-023 does that!

It is max-out or do you think it could run higher boost at that rpm! Whats your N75 duty at that rpm?

 

[Madmile]

ah ok so it's more about more bhp higher up the revs?

Spot on i think the vf34's mid-range is fine its only the 6500rpm+ part i dont like.

Heres a link to bills Pe1820 vs IHI vf34. Look at the bhp/torque its only marginally more but its a lot more above 6500rpm because it holds on better.

http://forums.vwvortex.com/zerothread?id=2302792&page=2

 

[Casper]

Here is a link, look at the graph.

http://www.mobisux.com/album/showphoto.php?photo=210771&sort=2&cat=500


Hope it helps

 

[ibizacupra]

I'll let you all know how Jabbas new turbo fairs on my car i have scrapped the idea of a Td06 20g and have decided to try there 380bhp turbo. The hope is similar performance to Bills old Pe1820f basically only a peak power gain of 40bhp ish but instead of making 260bhp @ the fly @ 7800rpm were hoping for more like 340-350bhp.

Bills Pe1820f flywheel from awesome
http://www.awesome-gti.co.uk/rollingroad/graph/rr.xmas2_29.12.05/brockbank2.jpg

Custradcupras from awesome
http://www.awesome-gti.co.uk/rollingroad/graph/rr.scn_10.12.05/custardcupra2.jpg

You can see how the vf34 aint making the power i want to above 6500rpm. Jabbas new hybrid will hopefully fill the gap at the top end. It should also spool a little quicker than the Pe or at least as well. The results should be in by Mid October.

1900cc and big port also on mine

 

[ibizacupra]

The Pe was able to break Bills box the Td06 20g would probably be over stepping the mark.

The VF34 also broke the std 2nd gear, but that was heavy Cadwell use

 

[ibizacupra]

Is is worth changing a turbo out for 20/30bhp?

for me it would'nt be worth the ££ for return.
£1200 of new turbo and I want some decent power hike to justify the bother of doing it at all.

 

[ibizacupra]

when comparing VF34 to my PE1820, also remember the engine was 1781cc then 1900cc with big port cylinder head and 3" DP change also.

not just a turbo change and comparison

 

[Madmile]

when comparing VF34 to my PE1820, also remember the engine was 1781cc then 1900cc with big port cylinder head and 3" DP change also.

not just a turbo change and comparison

The new turbo is supposed to more effcient than the Pe1820. There saying upto 390bhp on largeport and upto 380bhp on smallport. Peak figures aint my aim just more sustained power. Time will tell. I guess 370bhp is the aim.

 

[ibizacupra]

The new turbo is supposed to more effcient than the Pe1820. There saying upto 390bhp on largeport and upto 380bhp on smallport. Peak figures aint my aim just more sustained power. Time will tell. I guess 370bhp is the aim.

they done any yet to have dyno's to have look see?

 

[Madmile]

they done any yet to have dyno's to have look see?

Jabba only ever let you know what they want you to. They seem to keep things under wraps these days. There web site claims upto 380bhp on smallport we know vf34.18 is good for 340-345bhp a .20 housing and decat would prob see 350-355bhp the vf34 is prob around a 35lb/min compressor wheel. Add a bigger comp wheel and i cant see the extra 20-30bhp being hard to find more so when wilko was saying v-power alone can allow upto 2 degrees more timing. Like i said its not all about peak power its the sustained power above 6000rpm i am looking at.

 

[ibizacupra]

as ever seeing dyno's to back up figures helps people see what the delivery is etc... just the same as digging up previous dyno's as comparisons.

I guess some will take the plunge, go to a RR days somewhere and the results can be seen for themselves, whatever they may be.

watching this space.

 

[ibizacupra]

Jabba only ever let you know what they want you to. They seem to keep things under wraps these days. There web site claims upto 380bhp on smallport we know vf34.18 is good for 340-345bhp a .20 housing and decat would prob see 350-355bhp the vf34 is prob around a 35lb/min compressor wheel. Add a bigger comp wheel and i cant see the extra 20-30bhp being hard to find more so when wilko was saying v-power alone can allow upto 2 degrees more timing. Like i said its not all about peak power its the sustained power above 6000rpm i am looking at.

exhaust housing is the poor item, including P20 housing.

restrictive and temperature limited