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PLASTIC GT MANIFOLD PROBLEMS?

 
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Old 18 Sep 2005, 12:31 pm
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Default PLASTIC GT MANIFOLD PROBLEMS?

How many of you are happy with the new plastic intake manifolds that you have installed? I heard some are having trouble with air/fuel ratios, but no one stated how built the PT was. It would seem that resetting the PCM would correct the problems, but there may be more to it.Has anyone checked the conductivity of the manifold, or added a ground wire to the throttle body? I was considering purchasing the plastic manifold, but wanted to do my home work first. Also if you remove the aluminum manifold it would be an oportune time to upgrade to the 04 injectors (if you have an 03 GT). There are also upgraded intercoolers available, one of which requires no modifications and is bolt in, anyone try the combination?
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Old 18 Sep 2005, 04:23 pm
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Quote:
quote:Originally posted by littleblueGT

How many of you are happy with the new plastic intake manifolds that you have installed? I heard some are having trouble with air/fuel ratios, but no one stated how built the PT was. It would seem that resetting the PCM would correct the problems, but there may be more to it.Has anyone checked the conductivity of the manifold, or added a ground wire to the throttle body? I was considering purchasing the plastic manifold, but wanted to do my home work first. Also if you remove the aluminum manifold it would be an oportune time to upgrade to the 04 injectors (if you have an 03 GT). There are also upgraded intercoolers available, one of which requires no modifications and is bolt in, anyone try the combination?
The PCM will be able to adjust for any AF ratio issues. That is what it does. Don't just drop in the bigger injectors withoug doing the Stage 1 upgrade. Your '03 PCM is programmed for the injector size/flow rate that it came with.
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Old 18 Sep 2005, 07:47 pm
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I think the plastic manifold people are quietly happy. I'm on the forum everyday, that has all the "gone plastic" people on it, and outside of an initial comment about A/F ratio, no one is complaining.
The manifold is on my list of things to do to my '04 GT.
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Old 18 Sep 2005, 08:57 pm
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I was a little surprised not to hear more people commenting on the plastic intake manifold. I was looking at thermal wraps for the stock aluminum manifold to minimise heat soak. I did put an insulator around the stock IC hoses which seemed to help during the summer and stop and go driving conditions.I will evaluate the best bang for the buck, and so far the plastic manifold looks good (with out modesty cover).
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Old 19 Sep 2005, 01:35 am
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Performance wise I haven't heard anybody say, "Oh Wow!". It's not something that you are going to feel performancewise. The ones who are really going to feel it are the '06 GT's. The software has been changed to go with the plastic intake manifold and that is why they are rated 10 hp higher.
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Old 19 Sep 2005, 01:47 am
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Well i definitely felt a difference in the top end, like the the car pulls harder. I have a slight miss around 2k rpms because of the increased airflow. Will be going to the track soon, see what kind of numbers i run.
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Old 19 Sep 2005, 03:19 am
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Quote:
quote:Originally posted by AZ_IceMan

Well i definitely felt a difference in the top end, like the the car pulls harder. I have a slight miss around 2k rpms because of the increased airflow. Will be going to the track soon, see what kind of numbers i run.
Ice, has anyone solved that miss yet? I've heard several others who have installed the plastic intake manifold mention that. I wonder if the '05-'06 programming solves that problem or if that problem is from something else? Did you have that miss before the install?
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Old 19 Sep 2005, 09:25 am
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Quote:
quote:Originally posted by Mean Green

Quote:
quote:Originally posted by AZ_IceMan

Well i definitely felt a difference in the top end, like the the car pulls harder. I have a slight miss around 2k rpms because of the increased airflow. Will be going to the track soon, see what kind of numbers i run.
Ice, has anyone solved that miss yet? I've heard several others who have installed the plastic intake manifold mention that. I wonder if the '05-'06 programming solves that problem or if that problem is from something else? Did you have that miss before the install?
It may indeed be a programming issue... I have an '05 that came with the plastic manifold, and have not noticed a miss of any kind - smooth all the way up...
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Old 19 Sep 2005, 11:02 am
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It's because the plastic is a higher flowing manifold than the aluminum that some people are having issues. Try a lower gap on your plugs, or iridiums gapped at .028-.033, and it should get rid of the stumble.

On the 05's and 06's the new manifold and PCM programming gives an extar 10hp. If installed on previous year PT turbo's, it provides an extra about 8hp, less because of the PCM is not optimized for it.
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Old 19 Sep 2005, 04:52 pm
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[^]I replaced the manifold with the plactic one & also installed a new set of NGK platiums and I can definely notice and increase in porformance,gaped the plugs at 32 and no miss. My wife who is no speed demon even noticed a diffrince. I can say WOW! what an improvement.[^]
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