94touring

Well if it makes you feel better Karhren, i'll find another dyno sheet for stock twins.

94touring

Still searching for twins...but here is a gt35/40 with tuning issues.



"My SBC-ID wasnt holding boost weel past 15 psi so we quit doing pulls unti I can figure out the problem. We added a Wastegate spring to put it closer to where the boost controller would be controlling the wastegate but it didnt help. The boost comes on fast as you can see once the car was tuned and the curve goes up fast. Very good power all the way through the RPM range for a big single turbo. I was pleased. And am goin back for a 17 psi pull with my new motor next month"



Just look at that low end!

Dysfnctnl85

What is the key to low-end torque like that?



Most dyno charts I've seen show a difference of 100 between HP and torque. That last run is crazy close to a 1:1 ratio of HP to torque.

kahren

i dotn consider gt35/40 to be that big of a turbo, i consider low end to be under3k rpm and at that point from that dyno chart i see about 80 hp which i snot lal that great, a t04e woudl have about 100 hp. which is a big diffrence, also its not all abotu hp down low its more of a tq thing and when u calculate teh tq for that given moment u will see its a big diffrence stock twins at that point mak eabout 120 hp and 200 ft lbs of tq

94touring

At 2500rpms the twins had 55hp and 110tq, the gt35/40 was the same if not higher, while the t-78 hadn't begun to collect data yet. At 3k those twins had 80hp and 140tq, the t78 had 80hp and 140tq about 300-400rpms later. Unless you are crusing below 2500rpms, which is unlikely, there is very little difference to be noticed in "low end" power, and again this is comaring a big turbo to small twins. The gt35/40 is medium sized. Perfect for the street because you'll have efficeint horsepower that isn't laggy and will produce good top end that the twins could never hit.

94touring

If you want low end, buy a V8 and drive between 750rpms and 2500rpms.

kahren

whoops

kahren

here is one of the 3 put togehter, oen is the NA that has exahsut and intake and an afc, the other is an fd with a dp and mp, stock catback and intake and m2 ecu and 9 psi, and the other is a t78 iforgot at which boost level but it wasnt much, i dont have one of a gt35/40 that i cna thro in tehre just have a pic of one.

the fd had no boost controller if it did it woudl get even more power down low.

94touring

That twin turbo FD isn't making much power for those mods. Do you have any real dyno sheets?

kahren

its stage 3 m2 ecu af is flat at 10:1 so its even under there, its m2 stage 3 ecu made for more mosd and more boost, everythin on the fd is stock except fo rthe DP, MP, and the intake, and onyl 9 psi the catback is still stock and its not even facotry its a post mineke with crush bends lol.