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Old 01-11-2021, 04:28 PM   #1
TuneAFish
 
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How much boost before changing ring gap?

I'm just doing some exploration, but I was thinking about twin turbos, and I'm wondering how much boost can you add to a stock bottom end car (intake has never even been off) before you have to take it apart and adjust ring gap?

I tried to look through the existing threads but couldn't find this being discussed.

Thanks
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Old 01-11-2021, 05:46 PM   #2
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You're going to be limited by cylinder pressure and the strength of the thin ring lands on a stock LS3/L99 (which ain't that robust), and the aluminum block. If you're going to be taking apart the motor, might as well beef up the pistons/rods with forged components and you'll be able to make a few more hundred HP. That being said, numbers I have seen and experienced range from 700-850rwhp on the SBE motor, and 850-1000rwhp with forged components. Your longevity will depend on your tune and the continuous amount of power you're pushing.
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Old 01-12-2021, 02:37 PM   #3
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For what its worth: I asked the guys at GPI the same question and they told me they see guys all the time running just fine with 12psi but that was the limit. (Thats what I am doing)
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Old 01-19-2021, 08:50 AM   #4
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Thanks for the replies.

Tarendor - I was reading through some of your build threads and I was wondering, did you ever get that thing to the dyno? I'm also curious, are you still using that ZL1 pump? I was wondering if you'd run out of fuel with it at 12psi in the upper RPM range.
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Old 01-21-2021, 01:18 PM   #5
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I have not gotten to the dyno, I am down for winter.

When I talked to the guys at GPI when I was looking to buy my injectors they were confident that with the ZL1 pump (fpcm programmed by me using HPT) AND the ID1050x plus methonal that I would be good to 12psi with no issues. (SAID the methonal was optional too)

I have not even turned on the methonal yet.

However I am adding a msd bap. that I got in a trade because....why not? lol.

I have not ran out of fuel at all, but in tuning I only got up to 8psi before crappy weather hit and I parked him.
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Old 01-22-2021, 01:18 AM   #6
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Quote:
Originally Posted by Tarendor View Post
...because....why not? lol.
Seems logical :-)

It will be summer before I'm ready to add boost, so please keep me posted. I'm curious to hear how things go as you turn the PSI up!
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Old 01-22-2021, 10:31 AM   #7
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At 8psi its very sketchy hahaha I can't wait to see the final result myself. (I have full suspension and good tires but its sketchy still and I am not going to put slicks on him)
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Old 01-22-2021, 12:38 PM   #8
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I am around 13psi on the SBE but running E85 and two pumps on 105lb injectors.
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Old 01-22-2021, 12:39 PM   #9
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I'm sure you have done your research on the forum but just for nothing...back in September I installed a BTR stage 2TT camshaft along with the AGP twin kit. Turbos are 57/57's, Injectors are AUS 1000's and I have a JMS voltage booster for fueling,all else is stock. On a loaded hub dyno I made 650 RWHP and 619 RWTQ on 8lbs of boost. I did not have my 1LE dynoed before the install but assuming the low end of what I have seen on this forum (370 RWHP), I am making 35hp per pound of boost. Just take this for what it's worth we all know dynos are just a tool. I'm sure you are already amazed at the power, it's stupid fun!!
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Old 01-22-2021, 01:25 PM   #10
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As funny as it may seem...I don't care about the hp numbers.
What I want is 12psi of boost at a solid lambda and decent timing. Then I am going to add the methonal and add more timing...its all relative...compared to when I got the car its crazy lol. Their will always be faster cars out there but I plan on hurting some feelings this summer for sure.
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Old 01-23-2021, 09:23 PM   #11
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Thanks for the insights!
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Old 01-27-2021, 09:07 AM   #12
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Quote:
Originally Posted by TuneAFish View Post
I'm just doing some exploration, but I was thinking about twin turbos, and I'm wondering how much boost can you add to a stock bottom end car (intake has never even been off) before you have to take it apart and adjust ring gap?

I tried to look through the existing threads but couldn't find this being discussed.

Thanks
Ring gaps can not be tied to a boost number as there are too many variables that effect actual combustion temperatures which is what really determines ring gap requirements.

You could butt the rings by overheating the engine all stock.

You can make 800 Wheel and never butt the rings.

It is all about temps and ring growth.

Ted.
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Old 01-27-2021, 10:08 AM   #13
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Ted,

Do you reccomend converting to the 4 corner steam port vs staying with the factory 2 corner to help prevent hot spots?
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Old 01-28-2021, 07:18 AM   #14
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Quote:
Originally Posted by Tarendor View Post
Ted,

Do you reccomend converting to the 4 corner steam port vs staying with the factory 2 corner to help prevent hot spots?
All of our high powered engines have 4 corner, but not always possible with all combinations.
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