Does the IHI have the same lag as a standard turbo?

[Ianb]

Bill

As we discussed I think you suggested running 300hp utilising a VF34 p20 which shouldn't destroy or cause heat issues for my track work.....should be reliable on those settings.
IHI seems a nice progressive delivery looking at various logs. APR stage 3 available only for TT and S3 at present.

What's your oppinion of the eliminator range.....they appear from what I've read is that they are very laggy?
Anyone got any dyno logs on these.

Ian

 

[ibizacupra]

modest boost levels, power level and sensible tuning IHI is great.
Its fitment manifold wise is a complete 'mare however on the available cast manifold. once fitted its ok.

Matt H is running a VF22 now, but is 82.5mm bore 1800+cc and on 1 bar boost he was flying round combe on saturday. looked really good. his is switchable to 1.6bar also which gave him ~370bhp on Owen's rollers apparently.

VF22 has P20 housing btw

His is running my valves now.

I kinda miss the mk4 having seen it blitz round combe

 

[tommo-turbo]

Bill

As we discussed I think you suggested running 300hp utilising a VF34 p20 which shouldn't destroy or cause heat issues for my track work.....should be reliable on those settings.
IHI seems a nice progressive delivery looking at various logs. APR stage 3 available only for TT and S3 at present.

What's your oppinion of the eliminator range.....they appear from what I've read is that they are very laggy?
Anyone got any dyno logs on these.

Ian

I thought APR stage 3 was only available for the A4?

 

[Feel]

Stage 3 for the TT180 & A4, Stage 3+ for TT180, TT225 and A4's. TT's LHD only though, AFAIK. Supposed to be developing a RHD Manifold in Australia, but not heard anything about it for ages.

The question about lag/boost threshold on the GT28 based tubbies is why I was asking. Wondering if it's just the .71 that's laggy?

What would be an objective measure of boost threshold? ISTR reading somewhere about the point in the revs at which a turbo's classed as spooled, is where boost has reached a certain percentace of maximum? Or am I dreaming again?

Has anyone put an IHI on an A4 ?

 

[Songman]

I`m sure that APR St3+ for rhd/fwd will be available shortly - like now??? - Guy in Australia had the manif finished long time ago - i wonder why we`re still waiting

As for this BT `turbo lag `issue - in the last analysis it probably comes down to personal preference - some guys will like it other will not!

As i`ve said before, I certainly have no problems with my IHI setup, for use in the course of the normal daily commuter grind - as a matter of fact the car`s 6th gear performance is for me one of its best traits.

On the journey home tonight, in the usual 60/70/80 mph Yo-Yo traffic flow, the car is quite happy to drop to 2.5k in 6th[60 mph/GPS] and pull part/ full throttle without any distress - indeed in the vast majority of circumstances there`s no need whatsoever to drop a gear - the performance available is more than adequate to keep pace with traffic flow

Once the motor hits 3K[72mph/GPS] in 6th on full throttle, it will get to 4k[96mph/GPS] in just over 7sec

 

[Koomorph]

Bill

Why do you rate the IHIs over the GT28RS? I've seen some excellent results with this turbo pushing into the 350s bhp (not on VAG motors admitadly), but was considering going the eliminator route myself..... thought it was a solid turbo alround.... Would be interested to read your thoughts...

Cheers
Raf

 

[ibizacupra]

Bill

Why do you rate the IHIs over the GT28RS? I've seen some excellent results with this turbo pushing into the 350s bhp (not on VAG motors admitadly), but was considering going the eliminator route myself..... thought it was a solid turbo alround.... Would be interested to read your thoughts...

Cheers
Raf

the gt28rs i have driven did produce higher power than then vf34/p20, but in driving terms the spool characteristics of the vf34 were better, faster and far more responsove to on-off-on throttle applications.

A lot of this is down to the low inertia of the VF34 compared to the relative chunky GT series, but its low inertia is from small shafts, small bearings, which when you pump a VF34 up too high, becomes part of their weakness. Oversped bearings can and will fail as several IHI owners (not me surprisingly) have suffered. Keep the boost levels sane on the VF34 and its a great 1.8T complementry package, to which mike truluck @ Jabba has pioneered to great success. Its when we all now want >300bhp and closer to 400bhp (greedy aint we) that the GT series gets more appealing with its greater model option range over IHI. For us in rhd land, its also a big factor of manifold availability too, and its been Jabba's IHI mani or none, unless you go and make your own (like have evolved to)

VF34 is a nice unit for low 300's and its power delivery is nice & smooth, sustained (over k0x units) and very fast.

Its all a compromise... want higher bhp, then accept the inevitable it aint going to spool at 2K like a K03 would, but it can continue pulling hard to 7Krpm unlike a k03 unit.

hope this helps explain.

 

[Koomorph]

Thnaks Bill, appreciate your input. I guess there's also the cost vs bhp factor to consider. The GT eliminators and manifolds from ATP can work out £££ cheaper than going the IHI route - even when you take into account all the peripherals...

What's your take on using stand alone engine management like OMEX for example (although I'm not even sure it's sutiable for VAG engines...) and coupling it with anti-lag......?

Cheers
Raf

 

[Koomorph]

And one more thing Bill..... any idea what rpm the crank is rated to on the 1.8T?

Cheers
Raf

 

[ibizacupra]

And one more thing Bill..... any idea what rpm the crank is rated to on the 1.8T?

Cheers
Raf

forget antilag for a road car IMHO

OMEX is ok but you need to ditch fbw (I believe)
Mapping stock ecu is'nt an issue if you use the right tuner.

mine 485+bhp now on bog stock ibiza ecu.
Mapped by Custom Code.

no idea on crank absolute limit but there's folks on vortex running 700bhp on stock crank (apparently). mines >500bhp with its new mani on stock crank.

 

[Koomorph]

Thank again Bill - here's something that ATP sent me RE rev limit -

"As far as rev limiters go, the 1.8T valvetrain appears to be as reliable as 8000 rpms, so if you're able to keep it right under 7500 rpms, you'll never have a high RPM failure due to over-revving. We've done consistent 8200 rpms on setups where we can risk failure and we've never encountered a problem with the high revs."

Raf

 

[ibizacupra]

Thank again Bill - here's something that ATP sent me RE rev limit -

"As far as rev limiters go, the 1.8T valvetrain appears to be as reliable as 8000 rpms, so if you're able to keep it right under 7500 rpms, you'll never have a high RPM failure due to over-revving. We've done consistent 8200 rpms on setups where we can risk failure and we've never encountered a problem with the high revs."

Raf

I dont agree with them on this.
valve failure on my mk4 twice on std valve train on those same rpms would say the opposite, along with several other 20v cars I know of.

Uprated valves @ £375 vs total engine/turbo destruction £4000+

Its a simple equation.
If specing a turbo to "use" these rpms also consider valve springs to suit - £350/engine set, includes Ti retainers for less weight/strength.

my 2 penneth.

 

[Koomorph]

Righto - did you have valve failure at 8K rpm, or lower?

Raf

 

[ibizacupra]

Righto - did you have valve failure at 8K rpm, or lower?

Raf

lower... but the engine was used to 8k so at some point fatugue set in and failure was random after then.

There is no concidence that all the major UK tuners now use valves first identified and used by myself, where previously they considered std valves ok... up to the point they failed!

If building a BT car, which will have a higher rev ability to pump the air, then omitting valves is a risk I am not prepared to take. The cost vs expence of not doing it is a no brainer. total engine write off, including turbo is the end result when it happens.

£375 vs £4000 to scratch build another engine/turbo

Easy maths.

 

[jj10]

interested follower of this thread....

 

[ibizacupra]

another factor is running them lean

 

[traumapat]

this thread is frightening! since reading my right foots gotten very nervous

though im certain im within acceptable limits (franticly runs around house searching for a piece of wood....)

 

[ibizacupra]

log block 30 & 31 and see what afr your running.
might settle your mind (or not)

 

[Koomorph]

Poin taken Bill. Thanks for the good advice. If the injectors have enough headroom and aren't being maxed out, there's no reason it should run lean if it's been properly mapped.......?

Traumapat - is your rev limit raised?

Raf

 

[ibizacupra]

If the injectors have enough headroom and aren't being maxed out, there's no reason it should run lean if it's been properly mapped.......?

correct... and the latter part of the statement is key.