402TT

Ok I´m at 8-900 RWHP running mid high 9 at 145-148 mph at 15-17 psi. Car is 3650 lb. I want more power. This is street car driven on pump gas and alcy. Currently I have 402 with 9 to 1 with Tricflow 315 CNC and 92 mm fast intake. I understand that to be able to get to 1100 RWHP on pump gas I will need more flow through the motor or and more CID. For me this will be in 2 or 3 steps. Bigger turbos ( running 2 pc 58mm max hp each 600) , Bigger heeds and intake and then bigger CID. I have not decide in witch order I will do this since this is costly and I do not want to stop driving the car for to long. So what do you all think abot this ? witch order would I gene most? Bigger turbo? Bigger heads,intake or more CID (CID properly last thing to do.)

Thanks

1969x11

iTrader: (36)

So your current turbos are maxxed out at 15-17 psi? If that's the case new turbos should easily meet you goal. I would love to see a pic of your setup.

DavidPHumes

iTrader: (1)

A 402 is more than enough cubes to take you to your goals. You just need some better sized turbos.

3.8redbird

iTrader: (3)

Turbos, CID, then heads.

Turbos should get you there but if not go to a 4.125+ bore and throw some LS7 style heads on it.

stevieturbo

All you need is better turbos, dont waste your money on a new or bigger engine, or indeed heads.

58mm turbos are tiny. Exactly what units are they ? What fitment, manifolds etc ?

Pair of 6766's would be a huge step up.

mike13

iTrader: (27)

I would think bigger turbos would do it, do you have the rest of the mods to support 1200rwhp? Fuel system, etc?

402TT

I still have some rum in the turbo but with pushing more psi I need to pull timing do to pump gas . So the gain is not so great.

402TT

Those are PT5830 and APS C6.

402TT

I only need new fuel pump.

stevieturbo

it would be worth contacting Precision. They might be able to build you something that would be a direct replacement.

Even their newer CEA units in same size would offer a small upgrade as a last resort

Blackpanther99

iTrader: (8)

Definately just new turbos are needed.

wrp

Who actually has 1000 or better to the wheels right now?

evillsx

iTrader: (7)

Lil john and dr turbo are the people that can get you where you to be!

Blackpanther99

iTrader: (8)

I think that FAST 92 could be traded for another better flowing intake if you are in the budget.

Is this on a F-Body?

402TT

This is the biggest they have for me setup as it is today. It is CEA.

402TT

I would think I need better heads and intake to be able to hit +1000 RWHP at +-14 psi and there for it would not be only the bigger turbo to get there.

What intake would you suggest?

It is C6

stevieturbo

No matter what route you take then, you're going to have to do something to make larger turbos fit.

They will always be the limiting factor before engine, heads, cam etc etc

Failing that, the only real option for substantially more power is a shot of nitrous.

Old thread, but maybe some use ?

https://ls1tech.com/forums/forced-in...de-c5-zo6.html

402TT

When I got the car it had stock APS turbo build 402 with stock heads and intake and it was running + 11 sek at 130-132 mph. Then I did change the heads and intake and I added alcy and car went to 10,5 at 138 MPH This was at same psi (14 ) So head, intake did add some power and alky as well. Then I did change to PT5830 and with same psi I was running high 9 at +145 MPH So the big question is way would I not need better heads and intake to have better flow through the motor to be able to make more power with les psi witch I would think to be the key thing to be able to hit +1000 on 402 with +-14 psi. I will definitely need bigger turbo something like 6265

Me plan is to get the TDK C6 Z06 upgrade.

stevieturbo

I hear ya, and yes you might see some gains with engine mods. But never the large gain you want. The turbos will be the limiting factor here. They are just too small for the large motor, and spinning like crazy just to keep going.
In some ways, a much smaller motor and using more boost might be better, as you'd be placing the units in a more favourable part of the compressor map.

But you need bigger turbos, it will be the most value for money upgrade for sure.

skinnies

iTrader: (33)

Spend the money on a better fuel setup, 16 injectors and then do a little race gas cell(or e85) and be safer and able to make much more power.