Hi everybody,

please do not look weird if there is a lot of faulty grammars!

Today I have swap my Vf30 to a TD05H (stock only make it front entry)because there is a lot of good experience of the TD05H. Normally I made 314 bhp with the VF30, now when I have the TD05H I only make 251 bhp. This is based on my Apexi RSM?
When I made 314 with the VF30 my setup was:
HKS Hiper
HKS downpipe
Stock header
Unichip
Boost setup was: 1.35 bar
314 Bhp


Now my TD05H setup is:
Apexi GTSpec backbox
Apexi GTspec downpipe
Aftermarket (no branche) header ( I think is not a equal length)
Unichip (still the programm of the VF30)
Boostsetup is : 1.35 bar
254 BHP

I thought the TD05H is bigger then the VF30 so it suppost will make over 315 bhp, but why it is only 254 bhp. Is the setup not correct??
What I experience is that 3000 - 4750 rpm there is a lot of torque, but above it looks like it hold in no power at all!
Can somebody tell me why?? Do I have to use my VF30 instead of the TD05H?

Hope somebody will tell me! Very desperate!!
Help!!!!!!

Every comments are welcome

Regards Mike

Aside from the fuelling and timing needing to be setup to make it safe and fast on the different turbo, is the boost holding at high RPM like it did on the VF30?

Yes it is holding enough boost at high rpm

More detail on the torque curve? plot?

I have double check all the hoses, and maybe, maybe the intercooler hose is not fitted well. I have felt that the hose is a little bit off. This maybe explains why it feels dead by higher revs.

It was not the hoses, i have double check everything.

I have tested today and my experience; the boost dropped at > 4500 rpm from 1.40 bar to 0.8 bar. Before 4500 it make beautifull boost, but after.....
Someone know what this is? My boost is controlled by the Apexi avc-r.



Hope someone can tell me!!

Mike

ps:If I do not use the controller the boost is 0,8 bar from 300 rpm to 6500 rpm, so this is correct

Is it also possible that the spring in the Wastegate is to soft/weak. When you built a lot of gasses it pushed the "door" open??
Hope someone know !

You definetly have to re-tune the AVC-R unit. TD05 can "easily" hold 1.2 bar at top end.

Carlos H.

If retuning the AVC-R doesn't help then tighten the original actuator.

Thanx guys, i will try today.
I have already tighten the actuater

The VF30 boost creeps on some cars, hence the AVC program or self learning would have been built around that?

Tested again.

The apexi retuned but dit not solve the problem. The boost still drops at 4500 rpm to 0,8bar
Set the duty cicle to 88% at 5000 rpm, and the boost still dropping. F*ck. Everytime after 4500 it drops, why?????????
Know I have change the actuater, but I think this is not the problem, but you never know.

Is my apexi solenoid damaged??

Guys tell me what to do!!!! Please!!! Very desperate!!!

Mike ;-(

It is a little tricky, but try disconnecting and leaving open to atmosphere the pneumatic feed to the actuator and then go to wide open throttle at 5000 RPM and see if it boosts better then. Be ready to lift off because if it is healthy it will spool to 25 PSI very quickly and it will probably just carry on beyond 30 PSI. If so then there is a boost controller issue. If not then you need to look at the turbo/actuator. Also consider when the turbo spools this high what ignition/fuel map you use so that you do not get detonation whilst experimenting. It is a risky procedure if you can't be ready to back off very quickly, but it will tell you either way.

I tried that and it makes enough boost.
So will this explain of the damage apexi?? I do not understand why it makes 1.3 bar at 4500 rpm??

I don't know the details of the Apexi to know what you can do to sort it. But it doesn't sound like the turbo or actuator if it will make the boost. Maybe it worked fine with the VF30 because of the way they tend to boost creep. Maybe there is a problem with the Apexi solenoid or its pipework.

Have you changed both the duty cycle maps AND the target boost maps?

Having said that, the same duty cycle for a VF30 should see more boost from the TD05?

I have just plug the hoses to the oem solenoid, the results are the same. The boost is still dropping like hell at 5000 rpm.

I think the boost is still dropping when I disconnect the hoses to the wastegate. Because the boost is rizing to fast to see, I thought the boost is hold on. But I do not think so after I have use the stock solenoid. It can not be that the two solenoid is damaged.

What can I do.
I have try the following thing without any results:
Re-setting the AVC-R
Drive without the actuater
Plug to the stock solenoid
Tighten teh actuator
Change the actuator
Double check all the hoses

When I change the vf30 to the td05 I also change the header at the same time. Is it possible that the header makes the dropping?

Mike

Is it making to much exhaust gasses that the actuater "door" opens ? This will explain the boost dropping??

Yes it could be. Try waiting till 5500 RPM with no pneumatic feed. If the wastegate is being blown open then even at sustained WOT it will not go higher than it does with your boost controller. Still be cautious, but see if you can try it.

huuummm...just fitted headers?

Checked slip joints (if they have any)?

Checked joint to head / up-pipe. Maybe damaged uppipe during fitting?

Dropping boost at high rpm could be caused by a leak, although you would most likely hear it?

hi JamesS,

If there is a leak, you will hear it, and even smell it. But will a leak results in a dropping boost from 1.4 bar to standard 0,8 bar??

As flow and temperature increase, join leaks gas - giving dropping boost?

You don't have a Samco inlet hose that's getting sucked partially closed have you ?

Andy

I do have a samco hose, is this the one who makes trouble??

The Samco inlet hoses are prone to partially collapsing at high air flows, this throttles the air inlet and dramatically reduces the boost at higher RPM.
There is not an easy solution to this due to the location :rolleyes: I have had a result by shortening the hose at the turbo end and then stretching it on, leaving no extra hose to pull together due to suction. Either that or try the OEM inlet back on ??

That is the air-intake pipe, not the samco pipe under I/C......

Yupp, it's the air intake pipe Andy is thinking of.
And not the Ic Y-pipe

I do not think the hose is collapse otherwise it will happen to the vf30.
Do you know how many turn do I have to tighten the actuator, for 1.0 bar?? Or 1 turn = x bar, somebody knows???

My tuner also says the combination of a equal lenght header cause this problem. When he tunes a car with a td05 + aftermarket header the boost did not hold till 7000 rpm. A lot of people here have the same problem. A solution will be a upgraded actuator (1.0 bar for example) and set the AVC-R at 90% duty cycle.
Are you guys agree what they say?

I am trying to tighten the actuator but do not manage to set at 1.0 bar or 1.1. bar. Or it gives 0,76 bar or 1,56 bar

Mike

Well it may collapse as the TD05 should be sucking a lot more air ;) than the VF30.

Carlos H.