Picked up my T78, have many questions
09-29-02, 03:20 PM
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Picked up my T78, have many questions
I picked up a used T78 kit yesterday afternoon and I'm now in the planning phases of how to make the kit more reliable for daily usage. As is, I'm sure the kit is fine but I'd like to ensure there are no melted wastegate signal lines, oil drainback lines, etc...So what I'll do is post a few pictures and ask questions along with each picture.
First, the intake manifold. I was told that it was an HKS tubular, but I believe it's the GReddy. Can anyone tell from the images? It's an undivided manifold (the T78 has a divided housing) despite what the header to turbine housing looks like. There is a divider on the mating surface but not directly behind it, inside the manifold.
Second, there's a small brace which connects the primaries to the wastegate primary. It's cracked. I'm going to have this rewelded. Any problems in doing this? I'd like to add an additional brace but I can't see a good location to do this. Ideally I'd like to connect the manifold to block flange to one of the primary tubes. With the wategate routing, this isn't really possible, so perhaps to the WG primary instead?
Ok a few pics...
First, the intake manifold. I was told that it was an HKS tubular, but I believe it's the GReddy. Can anyone tell from the images? It's an undivided manifold (the T78 has a divided housing) despite what the header to turbine housing looks like. There is a divider on the mating surface but not directly behind it, inside the manifold.
Second, there's a small brace which connects the primaries to the wastegate primary. It's cracked. I'm going to have this rewelded. Any problems in doing this? I'd like to add an additional brace but I can't see a good location to do this. Ideally I'd like to connect the manifold to block flange to one of the primary tubes. With the wategate routing, this isn't really possible, so perhaps to the WG primary instead?
Ok a few pics...
09-29-02, 03:25 PM
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Crack in manifold brace. One more question...would ceramic coating the inside of the manifold be worthwhile or would it create too much heat retention? I'm leaning towards NOT doing it, but if it's beneficial, I'd like to hear it. I'm not sure there's a coating made that can withstand the high temps.
09-29-02, 03:29 PM
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Now on to the wastegate. I noticed the various vacuum nipples are threaded meaning I could run braided line to them by changing the fittings. Thing is, on the intake manifold side, I'd have to drill out and tap for a threaded fitting which is something I'm not too enthused about doing.
Are there braided fittings with integral band clamp ends? Would I be fairly safe running high grade silicone lines with heat shielding?
The wastegate looks like the regular GReddy unit, not the race. There's a small metal flange adapter with a gasket. Is that a standard adapter or something that was needed to run with the HKS manifold (if indeed it is an HKS)? The gasket looks pretty charred. I should probably replace it now. Are replacement gaskets for this kit tough to obtain?
Are there braided fittings with integral band clamp ends? Would I be fairly safe running high grade silicone lines with heat shielding?
The wastegate looks like the regular GReddy unit, not the race. There's a small metal flange adapter with a gasket. Is that a standard adapter or something that was needed to run with the HKS manifold (if indeed it is an HKS)? The gasket looks pretty charred. I should probably replace it now. Are replacement gaskets for this kit tough to obtain?
09-29-02, 03:31 PM
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Here's the adapter. It has a small ridge which extends into the WG valve area, sort of like a fire ring which allows for a gasket free adapter to WG body connection. There is a gasket which sits between the adapter and the turbo manifold WG primary.
09-29-02, 03:32 PM
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the gasket...pretty well charred and eaten through a bit, but still plenty of material there to keep it sealed. Flaunting my knack for the obvious, I should replace it, no?
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09-29-02, 03:36 PM
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On to the turbo! Have to say I was a bit shocked by how large and heavy the T78 is. About the size of a volleyball. Quite scary! Anyway, the turbo already has a braided oil feed line although with non-swivel ends. I may change this. The oil drainback was essentially a section of 10AN or so fuel line. Standard rubber stuff. Again, I'd like to change this to a braided but not go through the trouble of changing the stock fittings on the engine. Silicone again with a thermal cover? The oil drain fitting is bolt on (on the turbine center section) so I could just unbolt it and have a new fitting welded on.
09-29-02, 03:41 PM
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Originally I wanted to have the turbine housing Jet Hot coated in their black 2000K material which is holding up well on a friend's T04. I've heard horror stories about them loosing things however, and now I'm thinking a ThermoTec turbine blanket or something similar would be just as effective. I need some sort of shield too. Is there a readily available heat shield out there for the T78?
Here's the center section with the braided oil feed line.
Here's the center section with the braided oil feed line.
09-29-02, 03:48 PM
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Almost forgot...there appears to be three EGT fittings. One is just before the turbine inlet and two are in each primary tube coming off the block. Does anyone make a DUAL EGT gauge? Two needles on one face? It appears that the EGT still in there is an Autometer probe. I'm assuming it will not work with any other type of EGT gauge. I do not know the fitting size but it'd be a disappointment if say a GReddy EGT (I need a 60mm gauge face for my Border meter panel) would not fit. I guess I'll just plug the two in the primaries.
09-29-02, 03:55 PM
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The downpipe/midpipe was welded together. The downpipe is mild steel and the midpipe is stainless. I plan on seperating them and having the downpipe ceramic coated inside and out. The midpipe is going to receive a Borla XR1 16"Lx3"in/out muffler. The downpipe will also have the WG dump tube welded into it (how far from the WG outlet, 14"?) and another 02 bung welded into it for the OZ DIY Wideband.
About wideband placement, I know BadDog and a few others have their 02 fairly far down in the exhaust path, as far as the first portion of the midpipe. I'm of the opinion (but not necessarily accurate) that the further down in the exhaust stream your 02 sensor is, the less accurate the reading. I base this assumption on the fact that fuel burn is still taking place after it exits the turbine housing and travels down the downpipe. With the flame front moving down the exhaust path, fuel is burned and the a/f ratio changes. Does anyone see a problem with placing the second 02 bung for the wideband within 10-12" between it and the turbine outlet?
Jeez, I feel like a post *****! I greatly appreciate any feedback or additional ideas you may have. As I make changes to the kit, I'll post pictures/experiences/problems and results.
michel
About wideband placement, I know BadDog and a few others have their 02 fairly far down in the exhaust path, as far as the first portion of the midpipe. I'm of the opinion (but not necessarily accurate) that the further down in the exhaust stream your 02 sensor is, the less accurate the reading. I base this assumption on the fact that fuel burn is still taking place after it exits the turbine housing and travels down the downpipe. With the flame front moving down the exhaust path, fuel is burned and the a/f ratio changes. Does anyone see a problem with placing the second 02 bung for the wideband within 10-12" between it and the turbine outlet?
Jeez, I feel like a post *****! I greatly appreciate any feedback or additional ideas you may have. As I make changes to the kit, I'll post pictures/experiences/problems and results.
michel
09-30-02, 10:45 AM
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The holes go all the way through into the manifold I believe...nope just looked...poked them and they don't go all the way through...so is the T78 supposed to come with a heat shield?
Michel
Michel
09-30-02, 07:56 PM
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My T78 kit came with a heat shield but no way to mount it. I had to cut it and make a bracket to mount it. It didn't go anywhere near the holes you have on your manifold.
Your manifold looks a little different, here's mine (a Greddy for sure) with my T78.
Your manifold looks a little different, here's mine (a Greddy for sure) with my T78.
09-30-02, 11:42 PM
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Hmm..interesting. Maybe it is an HKS manifold then. The "mounts" seem to be a factory job as the weld quality is much different from the EGT bung. Guess it'll have to be a fabbed heat shield unless I can get an HKS to work. Thanks for the picture.
Michel
Michel
10-01-02, 10:18 AM
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The two mounting holes on the manifold are for a heatshield but you won't be needing it unless you have your steering wheel on the right. It was there to protect the steering components on japanese Fd's. My kit came with two heatshields, one for the turbo and the other for the right hand drive Fd's.
10-01-02, 07:50 PM
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One last question on your manifold al900rr, and I'm assuming the T88 and T78 manifolds are identical, is the GReddy version fully divided? By the looks of the WG primary, I'd say no but I haven't seen it in person. Thanks again.
Michel
Michel
10-01-02, 09:36 PM
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Michel,
dual needle single gauge EGTs are available from www.aircraftspruce.com they have most everything you need to build a F1 racecar! it is a wonderfull resource, i use it all the time.
Im looking forward to seeing your car,ill be in town oct. 24th
1R1
dual needle single gauge EGTs are available from www.aircraftspruce.com they have most everything you need to build a F1 racecar! it is a wonderfull resource, i use it all the time.
Im looking forward to seeing your car,ill be in town oct. 24th
1R1