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 ZZP front exhaust log and crossover heat shield

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Jack the R
LARRY70GS
Cliff96
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Cliff96
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Name : Cliff
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ZZP front exhaust log and crossover heat shield  Empty
PostSubject: ZZP front exhaust log and crossover heat shield    ZZP front exhaust log and crossover heat shield  EmptyWed Nov 18, 2020 2:58 pm

I am sure these two things have been discussed on here already but have patience with a newbie joy
From anyone who has tried these two things, do they help?
Thanks
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LARRY70GS
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LARRY70GS

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ZZP front exhaust log and crossover heat shield  Empty
PostSubject: Re: ZZP front exhaust log and crossover heat shield    ZZP front exhaust log and crossover heat shield  EmptyThu Nov 19, 2020 8:47 am

Steve Ruconic (71stagegs) has the front log on his 98.  The stock front exhaust manifold is incredibly restrictive.  He showed me pictures when he did it.  There is no question that it helps.

https://rivperformance.editboard.com/u425

_________________
98 Riviera SC3800  All stock except gutted air box.
1970 Buick GS455 Stage1, TSP built 470BBB, 602HP/589TQ
Best MPH, 116.06 MPH, Best ET, 11.54
https://www.youtube.com/watch?v=UHCda-t_Jls
https://www.youtube.com/watch?v=sfT2tEO4XcU
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Jack the R
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Jack the R

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PostSubject: Re: ZZP front exhaust log and crossover heat shield    ZZP front exhaust log and crossover heat shield  EmptyThu Nov 19, 2020 9:19 am

I haven't tried one, but I'm considering it. People say the rear manifold is almost as good as a header, so most of the improvement is to be found in the front. The cost-to-benefit ratio for the plog is compelling. Considering headers are nearly a grand before installation, and their stage two intercooler is $1100, maybe it is better to go with the plog and intercooler? I don't know, but I'm guessing the plog is the better option unless you are going for the absolute maximum amount of horsepower you can get out of a 3800. Which will cost several thousand dollars, and if you need that much performance maybe you should be thinking about LS-swapping another platform.

Plog is only $150 - I think that's the way I'm going.
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Cliff96
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ZZP front exhaust log and crossover heat shield  Empty
PostSubject: Re: ZZP front exhaust log and crossover heat shield    ZZP front exhaust log and crossover heat shield  EmptyThu Nov 19, 2020 1:25 pm

I'm not looking for a lot of mods I'm just interested in things that help the stock engine run cooler and perform at its best. Thanks for the feedback
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albertj
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PostSubject: Re: ZZP front exhaust log and crossover heat shield    ZZP front exhaust log and crossover heat shield  EmptyThu Nov 19, 2020 9:53 pm

Cliff96 wrote:
I'm not looking for a lot of mods I'm just interested in things that help the stock engine run cooler and perform at its best. Thanks for the feedback

You'll even see performance improve with just porting the stock exhaust manifold (I did).

Cliff96 likes this post

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Z-type
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Z-type

Name : Andrew Zamiska
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ZZP front exhaust log and crossover heat shield  Empty
PostSubject: Re: ZZP front exhaust log and crossover heat shield    ZZP front exhaust log and crossover heat shield  EmptyMon Nov 30, 2020 8:37 pm

When I modified my '97 Riv and my dad's '04 GS we did PLOGS on both and same as the other guys, I have no doubt they opened up quite a bit of breathing space. We did a lot of other mods to both cars so it's hard to say the specific improvement but it could not have been a bad thing.

Do you mean the head shield for the throttle body? These M90's and M62's make so much heat I can't see that helping much, but they look neat razz
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Cliff96
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Name : Cliff
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PostSubject: Re: ZZP front exhaust log and crossover heat shield    ZZP front exhaust log and crossover heat shield  EmptyMon Nov 30, 2020 9:07 pm

Yes the throttle body heat shield but now I see the ceramic coated crossover pipe. I imagine that would really make a difference
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9ty7rivi
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PostSubject: Re: ZZP front exhaust log and crossover heat shield    ZZP front exhaust log and crossover heat shield  EmptyWed Aug 11, 2021 9:29 am

I can tell you from experience that is no doubt the best bang for buck when it comes to a cheap mod that not only lets you "feel" the results, but also experience it in terms of cooler temps and happier engine. I right away noticed an increase in mid range power bands I mean VERY noticeable! ZZP did their homework extensively when it comes to the powerlog IMO. I would say hands down this upgrade is worth it in terms of an investment for you Riv.
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9ty7rivi
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Name : terrance
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ZZP front exhaust log and crossover heat shield  Empty
PostSubject: Re: ZZP front exhaust log and crossover heat shield    ZZP front exhaust log and crossover heat shield  EmptyWed Aug 11, 2021 9:36 am

I even reused my rusty burnt crossover pipe bolts! Haha.

ZZP front exhaust log and crossover heat shield  20210813ZZP front exhaust log and crossover heat shield  20210814
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Spacecowboy067
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PostSubject: Re: ZZP front exhaust log and crossover heat shield    ZZP front exhaust log and crossover heat shield  EmptyMon Sep 20, 2021 3:29 am

Front PLOGS would help mitigate KR right? I noticed this thing knocks even with 91 octane... 93 is fine but can't find it anywhere. Been trying to free up restrictions via intake and exhaust to drop KR recently and would be dope if the log helps
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Jack the R
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Jack the R

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PostSubject: Re: ZZP front exhaust log and crossover heat shield    ZZP front exhaust log and crossover heat shield  EmptyMon Sep 20, 2021 2:14 pm

Short answer yes, long answer - if your knock is caused by low octane gas, you better bump the octane of your gas up. You can buy octane booster, but it is not cheap, and it will eventually clog up your catalytic converter. Perhaps you can have the cat deleted where you're at and run an emulator in place of the cat 02 sensor. You still be stuck buying booster, practically doubling the price of gas, but you don't want to chip your pistons and have to replace the engine.
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albertj
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ZZP front exhaust log and crossover heat shield  Empty
PostSubject: Re: ZZP front exhaust log and crossover heat shield    ZZP front exhaust log and crossover heat shield  EmptyMon Sep 20, 2021 5:27 pm

Spacecowboy067 wrote:
Front PLOGS would help mitigate KR right? I noticed this thing knocks even with 91 octane... 93 is fine but can't find it anywhere. Been trying to free up restrictions via intake and exhaust to drop KR recently and would be dope if the log helps

I'd have to kow all your mods in order to comment. There may be something you can do about the knock to get 91 to work OK. Like maybe your MAF is off spec.
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