To IHI or to K04...

[Wilko]

Wilko

Have u had a drive shaft failure??

Not heard of that before on the 1.8t yet.

Yep. Mind you they've done 80k miles and been abused.
Yanks break them all the time, and I think Bills done some too.
6 speed box has twice as many bolts holding the diff in too. Having sheared the bolts that hold the diff in in a 5 speed it looks like the way forward.

 

[ibizacupra]

On a track, where staying in boost is easy, I'd agree, but speed through roundabouts is often controlled by the guy in front of you, and exiting roundabouts in second gear can be lag, lag, lag, lag, and then off you go. Second is good for nearly 80mph in a 5 speed, and you're over 30-35mph before you're in boost, so the diesel you were hassling is 3 car lengths ahead of you before you hit boost.

But the diference is only 1-2-3 in 6 speed equals 1-2 in a 5 speed, and 4-5-6 in a 6 speed equals 3-4-5 in a 5 speed. For track work you'd just be using 3-4-5-6, instead of 2-3-4-5, so no more gear changing should be needed.

You can hardly drop it into first for roundabouts, and dual carriageways with roundabouts every 1/2 mile are common around here, and get used for some friendly performance testing against others.

But 5 speed boxes and drive shafts are not strong enough in my heavier car, and a 6 speed using diesel drive shafts is as strong as oem gets, so that's the way i've gone.

I would'nt expect the 6spd shafts to be any stronger, especially the short one which looks as thin as a pencil.
I snapped my long shaft a month or so back, 1st one, but I do have daft power & was giving it some in 1st/2nd when it cried "enough"

On track I am using 2/3/4 gears only - 92mph in 2nd @ 8200rpm on my size tyres - eak!
when running the close ratio 6spd quaife dog box, the ratios were simply too close and the gear changes were frequent and slow compared to having a longer gear which the engine has to pull against. End result is I have superb traction on the 5spd where I did'nt on the 6spd as it was too low geared. (for mine anyhows)

 

[ibizacupra]

Yep. Mind you they've done 80k miles and been abused.
Yanks break them all the time, and I think Bills done some too.
6 speed box has twice as many bolts holding the diff in too. Having sheared the bolts that hold the diff in in a 5 speed it looks like the way forward.

Was'nt your bolt failure a suspect peloquin batch problem tho?

VW bolt kit in mine and no issues ever. (on any box, and I have a few with atb diffs in)

On road tyres on mine, so I would definately fear for the tranny components if running sticky tyres again.

 

[Wilko]

Was'nt your bolt failure a suspect peloquin batch problem tho?

VW bolt kit in mine and no issues ever. (on any box, and I have a few with atb diffs in)

On road tyres on mine, so I would definately fear for the tranny components if running sticky tyres again.

Bolt failure om peloquin was from a substandard batch of bolts, but I had the testing done, and they were only a few percent substandard. On the basis that they failed, a vw bolt must be getting to about 90% of yeild (tested vw bolts too). Not a big safety margin in my mind.

I'm using diesel drive shafts bill, which are around 30mm diameter (Tubular)

Quaife close ratio 6 speed has what ratios? because standard 3-4-5 is very close to 2-3-4 in a 5 speed. I'm on road legal track rubber permanently, so the drivetrain does worry me.

 

[ibizacupra]

my old mk4 had spindly ns shaft when it went 6spd.. very short too so joint angles were quite acute.
Given I am running 100-150bhp more than you and mines ok (so far - famous last words) I am not worrying about the diff bolts, but everything else transmission related does concern me a smidge Hence spares

Got a plate diff in mine now so 1st drive in anger will be Mondays next race.
Hoping everything holds together.

 

[DPJ]

Are VW bolts marked with a strength rating?

 

[dan-ish]

Peloquin are mounted in with bolts now instead of studs and nuts,they look a good design

 

[Koomorph]

IF I were to go K04 - what's the max anyone has ever had out of it? 290 ponies?? With performance downpie and exhaust system and good FMIC ?

Would that need a manifold port?

Raf

 

[caney]

IF I were to go K04 - what's the max anyone has ever had out of it? 290 ponies?? With performance downpie and exhaust system and good FMIC ?

Would that need a manifold port?

Raf

jesus christ have you still not made your mind up the ihi you bought from wilko is so much better than a ko4! even at at 1.1-1.2 bar of boost it'll be better than a ko4come on mate make your mind up and get it doneif you wanted k04 you should of bought my old kit

 

[traumapat]

if your concerned about lag then what about the ihi vf22? maxes out at 320 but less lag... apparently. (not been in a vf34 powered car).

only have a ko3s to compare it to but the power is really to the red line. my conversion happened a year ago and ive not even a faulty maf to complain about. completely different car with ihi. ive never looked back

 

[DPJ]

if your concerned about lag then what about the ihi vf22? maxes out at 320 but less lag... apparently. (not been in a vf34 powered car).

only have a ko3s to compare it to but the power is really to the red line. my conversion happened a year ago and ive not even a faulty maf to complain about. completely different car with ihi. ive never looked back

Come on Raf!

Don't go the K04 route!

 

[myk3]

you wont be happy with the k04! well for a day or two you will be. after that you will wish you did otherwise!

 

[Koomorph]

Right, right, right!!! Sorry guys... .... You're all absolutely right and I'm just being unnecessarily indecisive at the moment...

IHI it is. Honest.

Other than the Jabba IHI downpipe (and Blueflame who WON'T build me a whole IHI back system), what other options do I have? I Know JBS have one but will it clear the bulkhead when fitted to an IHI on a Jabba manifold?

(Resaon I ask is because I have the blueflame exhaust on order as part of the GB which JBS use with their IHI DP and CAT - whereas the Jabba IHI DP and cat mates with a Miltek system.... does that make sense... it's late.....)

 

[traumapat]

Right, right, right!!! Sorry guys... .... You're all absolutely right and I'm just being unnecessarily indecisive at the moment...

IHI it is. Honest.

Other than the Jabba IHI downpipe (and Blueflame who WON'T build me a whole IHI back system), what other options do I have? I Know JBS have one but will it clear the bulkhead when fitted to an IHI on a Jabba manifold?

(Resaon I ask is because I have the blueflame exhaust on order as part of the GB which JBS use with their IHI DP and CAT - whereas the Jabba IHI DP and cat mates with a Miltek system.... does that make sense... it's late.....)

id ring them... it gets tight down there once the dp swells. jabba moved the engine a couple of mm.. which cured a knock.

whos fitting it for you? or diy?

 

[jonathanp]

not tempted by a hybrid KO4? should be able to get 320 with this?

 

[Koomorph]

MRC will be doing the fitting. I'm considering getting the Jabba DP and leaving the sports cat for MRC to source and fab up all the joinery between it and the DP and exhasut.

But if the JBS DP and cat is made to sit with the BF exhasut, it would be easier to fit that - but don't know whether it would all fit together when sitting on the end of a Jabba manifold....

 

[Koomorph]

not tempted by a hybrid KO4? should be able to get 320 with this?

Is that the one JBS do?

Not unless I can get one for under £500...

 

[myk3]

not tempted by a hybrid KO4? should be able to get 320 with this?

no way will you get that power, k04 isnt the way to go, hybrid or not!

 

[Koomorph]

I'd never actually considered it to be an option - so not gonna throw it in themix now.

Just actually had word from Elton at Jabba - they are developing a 2.75" Mk4 IHI system with Miltek will reduce the cost of the individual items from £900+ (IHI DP, Sports cat and Miltek exhasut) to £495 inc. Nice. Currently only available on the Octavia.

 

[caney]

I'd never actually considered it to be an option - so not gonna throw it in themix now.

Just actually had word from Elton at Jabba - they are developing

lol you'll be waiting years for them to finish thatspeak to doug at mrc as they use rs fabrications who are just down the road from them