KingOfCold

iTrader: (5)

Will i have to get re-tuned if I switch from a TC78 to a PT7675? The car currently has a 3" downpipe thats about 3ft long and dumps after the K-member but I'd like to run a 3.5" or 4" out the front bumper if I switch to a PT7675.

LS1NOVA

iTrader: (12)

Yes, at least check the tune.

SPRAYED 01

iTrader: (22)

Check the tune. I wouldn't go crazy on that dp out the front bumper. Why spend extra money and cut up a front bumper for very minimal gains. That turbo was designed for a 3 inch dp.

Sweet_SS

That PT76 should flow more air than the TC unit. I would keep an eye on a/f @ WOT on the same boost level. Its possible you'll have to add some fuel.

icicleboy

very curious to see graph overlays from the old to the new turbo. Please comment on difference in spool as well!

milkplus

iTrader: (3)

Same here. Those were the two turbos I shopped and in the end, price won because I'm poor. I'd love to know what I gave up for the money.

HydroStream6

iTrader: (16)

About 150rwhp - 200rwhp.

Yes, you will most definitely need to retune. I've done this swap myself.

spoolin turbo

Are you swapping to a cast 7675 or a new cea 7675?
If its a cast I would not expect that much gain.

123quattro

Definitely retune it.

stevieturbo

Of course it needs re-tuned. Any modifications that affect the amount of air the engine consumes will require re-tuning. And a turbo swap is a pretty substantial change.

HydroStream6

iTrader: (16)

He will most definitely see a big difference especially as boost goes up. The turbine on the 7675 is giant compared to a TC76.

SPRAYED 01

iTrader: (22)

Its funny to still see those 2 turbos because of the way differant companies label their turbos. 2 totally different turbos

willizm

iTrader: (10)

I spoke to my tuner about doing the same exact swap and whether or not I'd need a retune and if it would be safe to drive after the swap. His response was that I could do the swap and street drive the car without issue. he recommends that I get the tune touched up before romping on it though. Makes sense to me. It flows more up top so depending on how your car is tuned you would be fine to drive it, but get it tuned before you start pushing boost.

Let us know how you like the new turbo. I'm really curious to see dyno's and driving impressions between both units as I have a tc78.

spoolin turbo

So is the TC76 a 7668? Was/is it only available in that configuration?

Nitroused383

iTrader: (10)

I made the exact same swap, they are both about the same physical size with the comp cover of the 76gts being 3/8" bigger in diameter. You will need a retune for sure from running a more efficient setup. Less back pressure and a higher flowing comp cover.

KingOfCold

iTrader: (5)

That much? I was hoping for 50-60.

KingOfCold

iTrader: (5)

I'm definitely going with the CEA wheel