Thread: Thinking about getting a T67

Im not on a stock trans/converter/flex

But i dont have 1" chain

Originally Posted by 1999black3800

Im not on a stock trans/converter/flex

It doesnt really matter. The "best" converter is stock, upgraded flexplates are nice on any car, "built" transmissions short of the top notch hard part upgrades are sorta a joke if you ask me.

Originally Posted by Explicit_Spade

I've never looked into turboing a 3800 so someone school me, where is the powerband on a pt61 and where is it on a t67?

From what I've learned about turbos, I think it would take a few extra supporting mods to get the potential of a 67.

power band depends on cam and head choice, smaller turbos with a smaller ar spool faster than bigger turbos with a larger ar, you can have a smaller turbo with a huge ar and it will spool slow as ****, there is alot more in making a good running turbo set up than just slapping any old turbo on a car, thats why alot of people go with turbo kits the turbos are sized properly for what your going for, my t67 spools up in the 3500rpm range but alot of spool depends on your exhaust set up like headers and down pipe size and how restrictive your cat back is or if your even running a cat back

Do you really want to limp around town with basically n/a Grand Prix until you can get that turbo spooled in your upper rpm range?

Spool speed is pretty dumb to talk about.. brake boosting/antilag will put a 61 and a 67mm turbo on the same playing field in terms of spool speed. The 67 is a bit laggy in first gear, and most cars will not see full boost until late in 1st gear without a big PSI launch. My old T3 turbo fiero setup would make full boost in ANY situation as long as I could lay a tiny amount of brakes on it... antilag works quite well for cruising around.

Driving my T67 GTP around I never brake boosted or antilaged it.. and i never ran more than 14psi because it was stuipid. I never drove that car to race it really, because it just was a completely usless vehicle for that sorta stuff.

With turbo, powerbands dont exist.. If you have the pedal down, you make as much power as your wastegate wants you to make... Every dyno sheet from my turbo cars showed peak power when the boost spikes a psi over target at 4200rpms.. otherwise its dead flat... This was tested with modified timing camshafts, big cams, small cams, big turbos, small turbos.. its all the same.

for real i could show you a dyno graph of my car it starts a over 500whp and ends at over 500whp, when it starts to spool it jumps to 5 or above grand almost instant

.68 ar/ they make power untill your motor cant rev any more and how much boost determines how much power they make, from the start of a pull to the end i gained about 50whp, my dyno was done in mph rather than rpm but with in 5mph it went from nothing to just under 500whp and stayet right around there for the rest of the gear, you put the go pedal down and the second the turbo lights up its over 5k rpm

third gear, im in the process of uploading the dyno graph and it was a mustang dyno, it started around 89mph and by 93mph it was 475whp then climbed to 522 at the end of third gear

sorry if its hard to read i had to resize it a bunch to be able it upload it


4e14ea1f-208f-4ea7-a922-a1fa15b451b6_zps6dbe0a45.jpg

it looks to me like his climbs for 20mph and drops off the rest of the run but still shows the same thing he is damn close to max power almost instantly, im going to benifit from turning the knob a few more turns lol that run was only 17lbs of boost, i built a new motor this year and a better fuel system that can handle more boost, that turbo will be fine to make 650-700whp on my new set up