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Old 02-08-2004, 12:36 AM   #1
Brian Broz
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Default Swapped turbo...Std Stg4 map that was 18psi is now 13-14psi

Hi,
I have a TXS Stage 4 catless setup.
Today I had my SR40 swapped out for a VF35 port and polished turbo. I am (for now) running the stock TXS FMIC map (closed looop).
This map on the SR40 was giving me 18psi no problemo...I had to keep an eye on overboosting.
Now with the VF35 I can't seem to get more than 14psi no matter how many turns the ABC is set to.
I've looked at the tiny pic in the manual, and I believe the ABC was connected right...Is there anything else I should look for before I steal a laptop from someone???
Thanks guys. Love the VF35 for the city so far...even at lower boost. I feel much more connected to the gas pedal in crappy city traffic!
Cheers,

Brian
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Last edited by Brian Broz; 02-09-2004 at 07:17 PM.
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Old 02-08-2004, 10:46 AM   #2
SleeperWRX
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you need to use the little IHI supplied hose with the restrictor in it.

Either that or you're getting wastegate pressure because nipple on the turbo outlet is routed straight to the wastegate actuator.
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Old 02-08-2004, 02:00 PM   #3
Brian Broz
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Yup...double checked. The brass restrictor is between the nipple connected to the turbo (not WG) and the T-Fitting.
Does anyone else have any suggestions? I am running closed loop....I may try switching to open loop Stg4TMIC standard map (once I get a laptop).
No matter how much I adjust the abc it doesn't seem to make more than .5 psi difference.
Does anyone have any other suggestions?
The car is pulling nice and quick, just not enough pull! I got too used to 17-18psi with the SR40.
Thanks for any suggestions,

Brian
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Old 02-08-2004, 04:56 PM   #4
Brian Broz
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Checked and double checked. Even switched to an MBC (bypassing the stock solenoid and ABC) and it is boosting at the same 14psi level. Turning the MBC didn't seem to have an effect.
Anything else obvious I should look for?!
Thanks everyone,

Brian
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Old 02-08-2004, 05:35 PM   #5
MustGoFast
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first I would have said you need to change your map as the two turbos on the smae map will not boost the same as they have different strength wastegate springs..

If connecting and adjusting an MBC on the other hand doesn't do n e thing that's just plain odd... I would gues that either you have a connection issue, boost leak, or broekn MBC.
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Old 02-08-2004, 08:06 PM   #6
SleeperWRX
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Quote:
Originally posted by MustGoFast
I would gues that either you have a connection issue, boost leak, or broekn MBC.
word...i'm still rooting for a connection issue resulting in getting wastegate pressure.
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Old 02-09-2004, 03:36 AM   #7
Uncle Scotty
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The turbo's are two completley different units. They will behave differently.
You will need to re-tune for the new one.
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Old 02-09-2004, 03:40 AM   #8
Brian Broz
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Thanks for the posts everyone.
The thing that's confusing me is I'm running the Standard TXS FMIC map. That should be at least roughly OK for my setup....no?
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Old 02-09-2004, 07:52 AM   #9
big_adventure
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If you can't get more than 14psi even with an MBC, you likely have a problem that boost tuning won't fix. Whether it's a connection problem or a turbo problem - that I don't know from here.

That said, those two turbos would never have boosted the same on the same map. You could try tuning boost with the UTEC, but if screwing and unscrewing the ABC massively, AND trying an MBC didn't adjust boost at all, I'd start looking at connections and hoses and seals.

One more thing - the vf35 is not going to be nearly as strong as your sr20 was. You will not be able to run the same high-end boost. It will spool faster and sooner, but stop pushing pretty early.

Have fun,

-Sean
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Old 02-09-2004, 11:19 AM   #10
ataac_flat04
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I'd check and see if you have an adjustable wastegate linkage rod on the VF and give it a couple of turns to tighten it up some. HTH's -Chuck
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Old 02-10-2004, 07:19 PM   #11
Brian Broz
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Well, It's been a few days and I'm even more confused. On the way to work today I was boosting real close to 15psi accellerating in 2nd and around 16psi in 3rd....great news, although spoolup seemed a bit slower than I expected out of the 35. I was hitting 15psi boost around 3500 in 3rd.
Now I took my car out at lunch and the car is only boosting around 10psi in 2nd and I don't get full boost until 4500 in 3rd! After warming up the engine of course...
I'm probably gonna replace the hoses beween the turbo and wastegate actuator (and t fitting)....
I have heard you can adjust the wastegate rod, could that be it?
Lastly, I have heard of people with the FBC that is "stuck"...I suppose trying the MBC again will determine if that's it.
Lastly could my GFB BOV be the cause of this?
Hoping for any other suggestions...my car feels so slow its painful!!!
Thanks guys/gals,

Brian
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Old 02-11-2004, 10:11 AM   #12
big_adventure
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If your BOV isn't adjusted correctly, or if you have a bad connection, it could cause leaks.

I don't think you will be able to adjust the wastegate rod on a VF turbo. You can on the stocker, but the VFs don't let you - at least, the one's I've seen don't.

Good luck.
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