Lots of these videos out there, so obviously nothing new in terms of parts. But here is our first one and how it did. Dyno graph and video is at the end if you want to skip, but big takeaways are it came in on race gas which 100% helped the numbers. I did multiple pulls in a row to heat soak it as the OEM IAT timing logic is very aggressive as to be expected for a car with a warranty on pump gas.

Either way enjoy and looking forward to doing many more!

 

That's incredible. I would love to see it on 91 as well to compare especially because I am in california and will be dealing with that myself. I'm glad to see one in your shop. What do you feel the largest gain was from? Is this still all on the stock tune? I wasn't sure but assumed it wasn't. Do you think there's a lot more on the table with a tune?

 

our 91 is really awful, we have customers move here from CA and have to pull a degree or two sometimes over your 91 haha. The car was not tuned as I told him put some miles on this thing because even OEM gets things wrong and I would hate to have something happen after we tuned it, the internet in all their glory no matter what would think we blew it up. He is going to put a few thousand miles on it and then have us tune it.

The gains were 95% from the downpipe I guarantee. The cat-back is no gain just sound/weight savings. The JLT airbox I'm sure was worth something but until I do just that back to back who know's. When doing the downpipes you have to remove the OEM airbox so most customers I'm sure will just add in the airbox since it's free labor at that point.

On pump gas I highly doubt there is anything to be gained from tuning, no way you are getting more timing into it and bringing in more boost won't help things. If there is power to be had it more than likely will be down low before the turbo's really come in. The big thing on these will be race gas, you will see them all land around the 1100-1150 mark depending on dyno and the big reason is the fuel system is done and there isn't the ability to add larger port injectors in the tune (as of right now) once that happens then the limit will be either a piston or rod, or if those take it all whatever the turbo's run out of steam at assuming the clutch holds and valvetrain handles it.

What we know now will not be the same a year or two years from now.

 

Great job Joe! And thanks for sharing SAE Corrected...you know how to roll!

 

Good to know. I kind of assumed there wouldn't be much left on the table as you mentioned without higher octane. I remember even with the c7 zr1 it was an issue and this wasn't going to get better.

Since you did the catted down pipes did that trigger a check engine light? I was intending on installing catless down pipes but know it will need a tune to eliminate that light. (when the time comes--still waiting on the car itself) My motivation at this point will be for hearing the turbos spool vs the power anyways.

Do you see the ability to do a flex fuel setup at some point? I realize it got pretty complex with the c7 zr1 but wasn't sure the thoughts with this model.

 

See my responses above in bold.

 

What exactly is down pipes? Does it not have down pipes from factory? Picture before and after would help. Thanks.

 

Google is your friend.

With the car above there could be some secrecy to the parts lol.

 

What exactly is down pipes? Does it not have down pipes from factory? Picture before and after would help. Thanks.

 

omg if you can't answer sit back please

 

"Downpipe" is the term applied to the section of exhaust connecting the outlet of the hot side of the turbo to the rest of the exhaust system

the ZR1 gets plural "downpipes" because it has two turbos

OE systems are usually small diameter and catted. The exhaust leaves the turbo in a swirl (because fancy that, the turbine is spinning) and giving it room to expand and reduce restriction is huge for gains

TLDR: OEM exhaust plumbing components small for noise and emissions. Aftermarket go brr and bigger is better more powah

 

Downpipes is a term for the pipes directly off the turbo exhaust housing. It is the connection pipe that contains the catalytic converters. Saying the word downpipes always suggest you did an aftermarket setup this could be high flow catted or catless. Turbo's hate back pressure and by freeing up the exhaust on the back side of the turbo you can decrease spool time and get a good bit more out of the turbo due to it not fitting the backpressure.

 

Or you could just look it up. Every turbo car on earth uses a downpipe of some sort.

Asking somebody to take before and after pictures is not something you should just expect. So if you search it.........blamo thousands of down pipe pictures for you to admire.

 

forgive me if I've made a serious criminal act. I've looked online but wasn't sure. Next time you have a question i sure hope I get to respond.

 

ZR1 downpipes not Cordes.


Not my pictures.

 

I never said anything remotely even close to that. You are making this way harder than it needs to be.

 

Would high flow cats with downpipes void the GM warranty?

 

Yes, on the engine anyway.

 

And possibly on the rest of the powertrain.

 

that's a no go for me then. As much as I like loud I just couldn't afford a engine on my dime.