Originally Posted by VIIIdriver

Hey guys,just a bit of information here,i had a bit of trouble with the wastegate on this turbo,not a biggie though,i found out it was very sensitive to wg preload making it problematic to spool adequately,well today i cut off the wg flapper so it wouldn't be in the way since i decided to go external wastegate and this is what i found,i'm not sure how big the factory wastegate flapper is but this one is huge imo,almost 49mm ! ,even my Turbosmart is only 45mm lol.

Originally Posted by boostzealot

Sorry its been a while since I updated this, but you guys know I was building a 2.3 stroker for this turbo setup to see what it could do against a 2.3 I built last year. His setup has the FP HTA71. We will be running the same boost, have the same tuner, and will utilizing the same fuel as well. So, on to the pics!







After her first start, first oil change, and first 20 miles about to get her second oil change


Currently the new motor has 730 miles on it....and I built it on the 26th of May. lol took me only 4 days to get it done! Long story short, I dropped the motor off for machining and balancing on the 21st got it back on the 24th, put it together after cleaning it on the 25th, installed it on the 26th had it running that night, drove her on the 27th! The break-in tune is very conservative and has allowed me to be able to perform full pulls (hard break-in) with no knock and safe but not pig rich afr's. The car's boost has also been turned down a tad so that I wont get too happy with the loud pedal. But at only 17psi it surprised a 600cc CBR. Id say this turbo is going to be well worth its wait for certain. I cant wait to crank it up to 25+psi. Stay tuned!

Originally Posted by JSPturbo

Hello. I have the same problem with my 25g and i had to modify the exhaust manifold with an adaptation and test it:







The next week I will finish up my clutch and road to see how it works !!!

Originally Posted by JSPturbo

Hello. I have the same problem with my 25g and i had to modify the exhaust manifold with an adaptation and test it:



The next week I will finish up my clutch and road to see how it works !!!

Originally Posted by stanlsha

viii driver what have you done in order to ensure that your seal between the o2 dump and the hotside wont leak i was thinking about your setup the other day and realized there would be a large loss in efficiency of the wastegate if you had any leaks there

Originally Posted by RSMike

So you're venting off both "scrolls" here?

Have you put a divider in to stop the scrolls mixing before the external wastegate is open?
If you haven't, expect 600-900 worse spool.

Originally Posted by 94AWDcoupe

that will certainly control boost fine. but you killed the twin scroll effect during spool up by joining runners 1 and 2. you will gain about 400rpm lag

Originally Posted by stanlsha

to viii driver i figured that was the case i guess my only concern was warping in the flange relative to the hotside my thoughts were possibly to have the flange machined perfectly flat to ensure and solid seal

Originally Posted by JSPturbo

Hello. The runner 1 and 2 are separated from the wastegate discharge,only the 1 and 4 "discharge" to wastegate side.

Originally Posted by 94AWDcoupe

you can clearly see the wastegate is open to the no 2 runner as well as runners 1/4.

you are going to loose 400 rpm spool or more.