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Finished up my twin turbo build a little over a month ago using cxracings t4 gt35s
It's been tuned on the street and at the track so I don't have any dyno numbers
On a 5.3 with 10.1:1 compression and e85 I trapped 136 and change at 15psi and 13 degrees of timing. Car weighs right at 3860 with me and fuel.
Tried to make a pass at 18 and it went 4mph faster in the 1/8 but had to get out of it in third and still went 135.
I think it has a decent amount left in it still once I get everything sorted out, just not sure what kind of numbers I could expect with it turned up to 20+ lbs of boost before the turbos start to run out of breath.
Not many people using these I guess
I'm having the car dynoed on the 30th
I'll try and make a few pulls at different psi to see how effiecent they are at different boost levels and see how much they'll push before they start to fall off
76/58 is a hell of a wheel split. Generally that will be slow to spool compared to say a 61/62 Gt35. Working with twins in a 5.3 though I'm sure its "fine".
I thought it would be a lot laggier than it is honestly
They start spooling at 2800-2900 ish and are all in a few hundred rpm later
I have a tight 2800 stall and it's almost instant, I think the little bit of extra compression I have from flat tops as well as using e85 is helping a bit, but with how fast they light off I thought they might run out of steam fairly early.
I'm running it up to 6900 and there's no noticeable drop or plateau in power at 18-19 psi
Hoping I can squeeze a little more out of them, just haven't been able to find any builds where people have used them other than a few people using them at low boost levels
Twin 68's are fairly big on that combo, so that's good to know they spool pretty quickly. Maybe twin 70's on a SBE LS1 would be about the same as these on a 5.3. I'll be interested to see what kind of numbers you put down. Your MPH/ET's reflect it's making great power.
Posted in my build thread but I figured Id put it on here too
Went to a dyno day and made 3 pulls on a local dynojet
At 18 psi it made 730/669
Unlocked converter with the shitty China airfilters on
The first pull I made at 14psi and the tires spun pretty bad and the graph looks terrible...lol
The next pull was at 17psi and it made 708/632
On the third pull I bumped the duty cycle up quite a bit, but it only made 1 more psi and hit 730/669
There were quite a few turbo cars there that we're having trouble getting enough load to the turbos, it usually make 19+ psi on the street and made less than that at more duty cycle.
A friends forged 6.0 billet s480 fox body made 830 at 20psi and a locked converter right after I got off. It's made over 900 on another dyno here so I know this one isn't too optimistic lol
I'm pretty happy with the numbers considering how simple my setup is.
After looking at the graph you can see what I think is the filters start to choke the turbos, I'm planning on yanking them off at the track this weekend and seeing how big of an improvement it is.
In general, how much have you guys seen these cone filters rob the turbo? How restrictive can they be? From the KnN to the cheapie china ones.... is the dirt worth the power gains?
Btw, Great job man! Badass!
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Ebay gt35 power potential 
