(TURBO) What makes/supports 500-550HP reliably for our cars?

[bulldog11267mad]

I am in the finishing steps of my BRZ build. My car is a IAG stage 3 closed deck block. It made 400+whp on 93 and 500whp on e85. my transmission went shortly after the engine was built. It actually went out on the dyno. You will absolutely need a different transmission to be able to hold that power level longterm.

[Irace86.2.0]

Originally Posted by bulldog11267mad

I am in the finishing steps of my BRZ build. My car is a IAG stage 3 closed deck block. It made 400+whp on 93 and 500whp on e85. my transmission went shortly after the engine was built. It actually went out on the dyno. You will absolutely need a different transmission to be able to hold that power level longterm.

So stock compression? What boost was needed to make that power? Did you hit the limits of E85 and 93?

[Irace86.2.0]

Originally Posted by Tonrogs

Lower the compression to either 9/9.5/10/10.5 to 1
Get a stronger transmission if you plan to actually use the power.
You will just spin... With those tires, no grip, the power is useless. Grippier tires will strip the trans, so upgrade the transmission and get grippier tires.
Again, that much power without being able to put it to the road is useless and reckless.
You will want a vented hood too for heat control. Upgraded radiator and oil cooler also help a lot.

What type of power are you making at what boost? E85? How is lag or off boost power at your compression ratio?

[Try Again]

Originally Posted by Irace86.2.0

He has flex fuel, so probably E85. I don't think methanol is as easy to get in Australia.

@FRS Justin 710whp... I don't know what his setup is or if he would be willing to share, but I thought he has a closed deck setup. I'm thinking lower compression too, but I can't remember.

I'm sure it depends on how often the car sees that 500+whp for reliability. If it was just a highway queen then maybe it would be fine with a good setup.

Yeah he has a closed deck block by outfront I believe. And im pretty sure he is running stock trans and stock compression ratio.

[Irace86.2.0]

Originally Posted by Try Again

Yeah he has a closed deck block by outfront I believe. And im pretty sure he is running stock trans and stock compression ratio.

I think it is 10.5:1, and I believe he went with dog gear upgrades, but I am not 100% sure if his setup stayed like that; I did read that he was working on a second block. I saw another post, which said he lowers boost to 5psi for daily driving, so he isn't rolling around with 710whp all the time. I think CSG Mike and others here are in a similar boat. I've seen dyno graphs with high peak hp numbers, but many people run track days with less aggressive tunes, and subsequently, less peak power, or they may daily with less aggressive tunes or lower boost maps for reliability.

https://www.ft86club.com/forums/show...2&postcount=25

[Try Again]

Originally Posted by Irace86.2.0

I think it is 10.5:1, and I believe he went with dog gear upgrades, but I am not 100% sure if his setup stayed like that; I did read that he was working on a second block. I saw another post, which said he lowers boost to 5psi for daily driving, so he isn't rolling around with 710whp all the time. I think CSG Mike and others here are in a similar boat. I've seen dyno graphs with high peak hp numbers, but many people run track days with less aggressive tunes, and subsequently, less peak power, or they may daily with less aggressive tunes or lower boost maps for reliability.

https://www.ft86club.com/forums/show...2&postcount=25

I just talked to him a week ago on facebook about if he coming for tx2k. And he told me 12.5 but who knows lol

[mrg666]

Corvette is a great car, just saying ...

[Tonrogs]

Originally Posted by Irace86.2.0

What type of power are you making at what boost? E85? How is lag or off boost power at your compression ratio?

E85, yes.
Running about 17-18psi before storing over winter. Working on getting the cd009 swap in currently. Any higher on boost(19-20psi) and my tires just spun recklessly. So i turned it back down to about 17-18psi.
Still a work in progress , so no dyno time yet. Have some m&h drag radials for when i want to turn it up and run at the strip or street drag nights.
With the drag radials and the cd009, I'm planning on around 28psi.

Didn't notice a difference really between stock engine with same turbo set up, vs built 9:1 cr engine. Same lag, same off boost power.

[bulldog11267mad]

Originally Posted by Irace86.2.0

So stock compression? What boost was needed to make that power? Did you hit the limits of E85 and 93?

I am running 10.5:1 compression closed deck. I also have built heads so the psi would be different on non built heads. im at 22psi at the moment. I did not reach the limit of what it could do on e85 but im close to the limit of what my turbo is able to flow. on 93 octane im sure their is room left but we wanted to keep it relatively safe for the engine.

[CSG Mike]

Originally Posted by Tonrogs

E85, yes.
Running about 17-18psi before storing over winter. Working on getting the cd009 swap in currently. Any higher on boost(19-20psi) and my tires just spun recklessly. So i turned it back down to about 17-18psi.
Still a work in progress , so no dyno time yet. Have some m&h drag radials for when i want to turn it up and run at the strip or street drag nights.
With the drag radials and the cd009, I'm planning on around 28psi.

Didn't notice a difference really between stock engine with same turbo set up, vs built 9:1 cr engine. Same lag, same off boost power.

Why not run custom traction control or boost by gear?

[Tonrogs]

Originally Posted by CSG Mike

Why not run custom traction control or boost by gear?

Will be doing boost by gear, just not there quite yet. Winter hit least year and the car got put away. More tuning to come once I get the trans swapped...starting that this weekend.

[dholloway543]

Agreed i wouldn't go too low on CP ratio but like 10.5 or 11 would be way better. I'm running 12.5:1 forged internals and the max boost limit of the turbo before knock is approximately 8-10psi.





Im not sure why but more boost = more power even though the overall cp is the same. My guess is that its less of a fighting force as the piston comes up so less power is waited on the compression stroke. More power in boost less power out of boost.

[CSG Mike]

Originally Posted by dholloway543

Agreed i wouldn't go too low on CP ratio but like 10.5 or 11 would be way better. I'm running 12.5:1 forged internals and the max boost limit of the turbo before knock is approximately 8-10psi.





Im not sure why but more boost = more power even though the overall cp is the same. My guess is that its less of a fighting force as the piston comes up so less power is waited on the compression stroke. More power in boost less power out of boost.

I run 12.5:1 with a boost level that is in the "red" on your table. Knock is definitely not an issue... you may want to investigate why you're knocking at just 10 psi.

[dholloway543]

Originally Posted by CSG Mike

I run 12.5:1 with a boost level that is in the "red" on your table. Knock is definitely not an issue... you may want to investigate why you're knocking at just 10 psi.

Are you running E85 only or 91 also. The reason im stuck at 8-10 is because i enjoy my flex fuel and dont want a dedicated e85 car. If you are chasing those numbers over dailyability then e85 can yield higher boosts