Porting Wastegate on 1988 Callaway Twin Turbo
07-13-2012, 01:08 PM
#1
Melting Slicks
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Porting Wastegate on 1988 Callaway Twin Turbo
My buddy recently upgraded his 1988 Callaway to a 3" exhaust. The car is suffering from some boost creep issues. He called Callaway and they told him he needed to port the wastegates on his turbos and they could do so for $2500. Having ported wastegates before on other applications I can't see where the cost would come form . But I wanted to check to see if there was something I was missing. I also wanted to see if there were shops like Precision, Limit Engineering, or Blounch, or others that folks might have used for porting in the past who might be more reasonable in cost.
07-13-2012, 07:47 PM
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Drifting
07-14-2012, 08:37 AM
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St. Jude Donor '10
07-15-2012, 05:32 PM
#6
My buddy recently upgraded his 1988 Callaway to a 3" exhaust. The car is suffering from some boost creep issues. He called Callaway and they told him he needed to port the wastegates on his turbos and they could do so for $2500. Having ported wastegates before on other applications I can't see where the cost would come form . But I wanted to check to see if there was something I was missing. I also wanted to see if there were shops like Precision, Limit Engineering, or Blounch, or others that folks might have used for porting in the past who might be more reasonable in cost.
Thanks
07-15-2012, 08:26 PM
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Melting Slicks
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Limit engineering rebuilt the turbos about 5 years ago. He called them and they said they were not interested in porting them, but said he could do the job with a dremel tool, and they would talk him through what he needed to do. They said it was pretty simple. I gave him the number for pretuning to check with them and also mentioned checking the EGR.
07-16-2012, 05:03 PM
#9
Drifting
A new valve is not always need depending on the turbo, some ports are so much smaller than the valve a simple port job fixes the issue.
07-16-2012, 10:39 PM
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St. Jude Donor '05
$2500???Must not wanna do it.
I need to start porting wastegates looks like.
I need to start porting wastegates looks like.
07-17-2012, 10:59 AM
#11
NCM Lifetime # 982
We have used Precision Turbo in the past with great results. Good luck.
I'll bet that Callaway has some great info. on the subject.
I'll bet that Callaway has some great info. on the subject.
Last edited by FU; 07-17-2012 at 11:32 AM.
07-17-2012, 11:36 AM
#12
Team Owner
The bigger exhaust will allow the turbos to spool up quicker on the initial launch, which will peg the boost gauge and beyond, but should start to calm down as he goes thru the gears. Is it showing runaway boost in the higher gears?
07-18-2012, 06:15 PM
#14
Do you have this issue?
I don!t but I still run cats and mufflers. I do have the big wonderbar and 15lb springs in the wastegates.
07-18-2012, 09:21 PM
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Team Owner
Before he starts porting anything, he should test the wastegate. If it's the original, the diaphragm may not be holding.
06-20-2014, 01:53 PM
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No, not really and I do have a very free flowing 3" exhaust as well, along with the wonder bar and spring and huge air filter. Now, I did change the intake manifold system, and it now revs easily past 6000 rpms verses the stock 5200 rpms. If I were to stay in any gear beyond the usable power range, then it would probably creep up, but obviously that's not the way to drive these cars.
Before he starts porting anything, he should test the wastegate. If it's the original, the diaphragm may not be holding.
Before he starts porting anything, he should test the wastegate. If it's the original, the diaphragm may not be holding.
Also as mentioned, I am going to check the springs etc... While we have them apart. Th reason for taking them off was we found the exhaust manifolds had cracked. Has anyone had an issue with the manifolds cracking,and if so did you upgrade to the stainless units which are about $1000 more than new mild steel units.
06-20-2014, 02:26 PM
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St. Jude Donor '10
I am bringing this thread back from the dead. Does anyone have a picture of what a ported turbo looks like. I have the turbos off, and the wastegate is a little different than the ones I am used to looking at. The Diaphragm goes straight down and seals off, rather than a typical arm/puck design. When folks are porting the turbos are they just opening up the area under the puck? Is there any advantage to porting the passage leading from the valve to the exhaust? The passage looks tight and I am not sure you could get a larger puck in.
Also as mentioned, I am going to check the springs etc... While we have them apart. Th reason for taking them off was we found the exhaust manifolds had cracked. Has anyone had an issue with the manifolds cracking,and if so did you upgrade to the stainless units which are about $1000 more than new mild steel units.
Also as mentioned, I am going to check the springs etc... While we have them apart. Th reason for taking them off was we found the exhaust manifolds had cracked. Has anyone had an issue with the manifolds cracking,and if so did you upgrade to the stainless units which are about $1000 more than new mild steel units.
From the exterior there isn't any noticeable change in the appearance on the wastegate and turbo.