KHShapiro

iTrader: (10)

now i know lots of you have your own opinon about Logs and why they suck, But that isn't what i am about to ask.

I Know very little about Turbo's but i have decide to venture out into the Turbo world and build my First Turbo car.
After Completely Fragging a 422 on the dyno , i have now started building an Aluminum 427.
With that said what size log? the plan is running a pt88 but again what size log?
3in log with 2in prime? 3in 1 7/8in? 3in 1 3/4in? 2.5in 2in? 2.5in 1 7.8in? 2.5in 1 3/4in?

i have done "some" reading on the matter and i have also contact some vendors but knowone has any real info. i know Real info will be hard to come by but any ideas will be taken into consideration
Thank You

MYTURBOT/A

Are you going to run both banks through the log like the TTi and QMP kits or are you gonna Y the X-over in at the turbo? if your gonna run both banks through the log i`d go 3in log with 1 7/8 primarys. If your gonna Y it in at the turbo i`d go 2.5in log with 1 3/4 primarys and 2 1/2in crossover going into the turbo.

Whistler

iTrader: (46)

1 5/8 or 1 3/4 is generally as big as you want with a turbocharged engine... race or street. Think small before the turbo for velocity and as big as you can fit for the DP

Like the guy above said... are you doing a log on one side with a manifold feeding it or two logs Y'd together?

KHShapiro

iTrader: (10)

yes both banks will be run through the log. As far as small before the Turbo for Velocity, wont the AR effect that?... Whistler is Cal working on your Car ATM?

Whistler

iTrader: (46)

I would run a 1 3/4 into a 3 inch log with either a .96 or a 1.30 AR depending on the intended use of the engine

Cal isn't working on my car, but I buy all my parts through him.

Do I know you?

KHShapiro

iTrader: (10)

No we have never met. i was talking with Cal Yesterday and her was telling me about a 1st gen that he had put a turbo into and was getting ready for a photo shoot with GMHTP.. Thanks for the input on the log

KHShapiro

iTrader: (10)

anyone with some Turbo info?

MYTURBOT/A

I`ve been trying to find the time to finish the 3in log for my turbo tech kit well see what happens when i get it done. Spool time might be affected but i`m willing to bet i`ll gain some HP from the lower exhaust backpressure and better flow from all the primarys entering the log at a 35* angle to direct flow instead of a 90* angle like the original log.

MYTURBOT/A

Also i believe the A/R can only be changed by switching exhaust housings.

KHShapiro

iTrader: (10)

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