Yes I have searched and could not find my answer

I have a new HTA green on my built 2 ltr, HKS 272 cams with all supporting mods on E85 running 31psi Profec B spec II EBC Autronic SMC ecu

I am getting full boost on the road by 3600 rpm in 4th starting at 2000.

When I do a run 1-3rd in my data log my boost climbs almost perfectly with the rpm line in 1st gear, on the shift to 2nd it takes .7 sec to reach full boost and on the shift to 3rd takes .8 sec to reach full boost.

My prev turbo was a FP white rabbit so it as incredibly responsive, anyway my question is: Is this normal for a HTA green ?

I did not check the preload on it when I received it being a new turbo I assumed it to be already set, I did ask for a 24psi actuator but wastegate pressure is 18psi.

here is a vdr I have done



since that VDR I have fixed the actuator lines and another small issue and it is now as stated above

 

numbers look good though....

 

Thanx mate, just curious about the response of this turbo if is normal for this turbo or not.

It doesn't feel laggy by any means on the street.

 

So, let me get this straight. Is this a BB Green, or a journal bearing Green? The FP 25# actuator opens at 18# with zero preload. So, your WG is opening as early as possible because it has zero preload.I guess that I don't really understand your question though.

When you atate that you are reaching full boost by 3600 RPM...what boost level are you reaching by that RPM? Are you reaching 24# of boost by 3600 RPM?

 

I am not 100% sure if it is a BB or not, I was told it might be but I did not order a BB one so I must assume it is not. MY friend said it was BB because with the car idling, you can shut the motor down and walk around the front of the car and the compressor wheel is still spinning quite quickly for approx 30-40 sec.

Anyway full boost 30 psi is reached at ~3600-3800 rpm in 4th.

I did not adjust the preload as I did not know I had to, from what you say I do need to adjust it a bit.

My question is the response on gear changes in a drag type run through the gears.

presently it takes .7 sec to come back on to full boost on the 1-2 gear change and .8 sec on the 2-3 gear change.

Would this be related to the preload not being set?

 

that turbo without mivec should see 30psi by 3800 rpm in 3rd gear with a good spool tune.. so your tune is lacking in the spool department.

in 4th you should see full boost around 3500.

 

really Tom?
He's asking about if the wastegate actuator preload - or lack of it - could cause his lag problems.
And then you come on here knowing that this could be the case, but you state that it could be the tune.
Funny that, you sell Tunes...

OP, check for preload.
Set it at approx 1/2 of the hole width (so you have to pull the actuator arm over the flapper arm)

https://www.evolutionm.net/forums/ev...wastegate.html

 

Thanx mate I checked the link in your sig and yes that appears to be the issue,I am having to use alot of duty to get 30 psi atm, I will check it tomorrow and adjust accordingly so wastegate pressure with ebc off is 24psi.

And no we didn't tune it for spool up or anything like that, tho I am tempted to leave it because as it is at the moment it doesn't blow the tyres off it when you stomp it and that is more useful to me as i am setting it up for track work.

 

rsmike are you ok?

I figured you already preloaded it and still couldnt get it to spool any sooner APEX'iEvoIV, thats why i said what i said.. now you know the expectations you should have based on what i said.. if you want examples of boost curves with that turbo let me know.. ive done around 30 cars with it.

i am not posting in here to get your business , was posting in here to give you information to help you get the maximum benefits out of your turbo/setup..

I misread what you said when you posted "since that VDR I have fixed the actuator lines and another small issue and it is now as stated above"

I figured you were saying you already addressed the actuator and still couldnt get it to spool and you needed advice if your spoolup was normal or not..

either way let me know and ill share some boost plots for you if you want to see.

as others suggested -- set the actuator about a half circle preloaded.. dont go to much further then that or you will induce compressor surge.

 

based on what you just said in bold, you have the ball bearing CHRA.. my black spins about 40sec to a minute also when the cars turned off.. i never seen a journal do that before with oil in it.

 

.7-.8 recovery is too long
should be .2-.3 for plain bearing. sounds like you have bb center.
maybe your wastegate is not sealed? or other leak?

 

Yes I was lucky enough to receive a few 'extra's thru my supplier so it may well be a BB one.

The motor reaches 1.2 bar ( 18psi ) wastegate pressure very quickly then sorta takes the rest of the time to reach ful boost, it does sound to me like it is a preload issue so I will check it and set it to half a hole.

Thanx everyone for your replies.

 

I checked it and it had approx 1/4 hole preload, I adjusted it to 1/2 hole and it now goes to ~22psi with no ebc.

The data logs look much better .6 in 3rd to hit full boost and it also peaks in 1st now as opposed to just rising with rpms.

 

Are your accelerator pumps set to "ON" on the autronic?

We tune cars with them "OFF", maybe your tuner forgot to turn them back on.

Also check your TPS wiring is working.

 

I have a SMC V 1.99, I don't recall ever seeing that option in mine. The TPS etc is working fine.