Twin gt35 5.3, couple questions regarding the ar
06-04-2018, 09:36 AM
#21
Elevation plays a roll, but In general anything over 100kpa is “boost”. Mine will make about 3lbs before pushing through the drum brakes. Similar timing and AFR. But my 10 PTC converter flashes to about 3200ish if I stomp on it. Sounds like you’ve got a super tight converter. Prob not going to see boost at that RPM level.
Last edited by Cwarta; 06-04-2018 at 09:50 AM.
06-04-2018, 10:00 AM
#22
Yea that’ll be stinker to get into boost I bet. Wonder how different the housings are physically. If my .63’s would fit we could swap. I wouldn’t mind a less violent setup! 
Might be another great application for a 50 shot for .3 seconds or so off the line to get them spooled. Cheaper and easier than any other option... bottle would last forever.
Might be another great application for a 50 shot for .3 seconds or so off the line to get them spooled. Cheaper and easier than any other option... bottle would last forever.
06-06-2018, 07:37 AM
#25
Well since I haven’t bought any parts yet, let’s talk about this real quick. What do y’all think about twin s366 turbos? Stock out of the box cast 66/73 .91ar t4. Would be a little overkill but should work ok on a 5.3 I'd think, seen people use them with success. That’d still give me room to grow in the future to a 6.0? I’d scatter this 5.3 block long before I maxed out some s366s I’d imagine lol.
Last edited by Y2K_Camaro; 06-06-2018 at 10:47 PM.
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Ab7 (04-16-2022)
06-11-2018, 10:26 PM
#28
New tranny works perfect! Put about 20 miles on it today, then tried the brake out. With the stock cam and stock 2500hd stall, I can reach 2600rpm in 3 seconds, and 110.4kpa. That’s with 16* of timing, and a 12.02 afr, so there is room to improve in the timing to see if I can get more boost out of it. Just a little info for you on the turbos
06-12-2018, 08:17 AM
#31
Did it do any better @ 30? Could also go the other way and see how it does... I run -17* on my 2 step to get it going. Usually once you get it lit, rpm will rise with boost. Getting past that initial hump is the tough part. Might be impossible on that converter without something like nitrous.
Have you looked into the trans coolant circuit bypass stuff? I don’t have any experience with it, but I think the idea is you hook up a solenoid and bypass the fluid going to your cooler back into the pan during the launch only. This gives you more slip off the line. Not 100% sure how it works. Sounds like it starves the converter for fluid temporarily so it slips more.
Have you looked into the trans coolant circuit bypass stuff? I don’t have any experience with it, but I think the idea is you hook up a solenoid and bypass the fluid going to your cooler back into the pan during the launch only. This gives you more slip off the line. Not 100% sure how it works. Sounds like it starves the converter for fluid temporarily so it slips more.
06-12-2018, 08:44 AM
#33
Restricted User
5056 turbos in .63 A/R T3 made 600 wheel on a 4.8 with a 216/220 114 LSA cam at 17 lbs on the heart breaker dyno.
Its now a 5.3 with a 222/222 113 LSA cam and those same turbos. I imagine its putting out closer to 700 wheel.
The .82 A/R T3 would be my pick for a street driven 5.3. The larger housings will make more power but you get into some strange territory with a large A/R T3.
Its now a 5.3 with a 222/222 113 LSA cam and those same turbos. I imagine its putting out closer to 700 wheel.
The .82 A/R T3 would be my pick for a street driven 5.3. The larger housings will make more power but you get into some strange territory with a large A/R T3.
06-13-2018, 11:31 PM
#36
5056 turbos in .63 A/R T3 made 600 wheel on a 4.8 with a 216/220 114 LSA cam at 17 lbs on the heart breaker dyno.
Its now a 5.3 with a 222/222 113 LSA cam and those same turbos. I imagine its putting out closer to 700 wheel.
The .82 A/R T3 would be my pick for a street driven 5.3. The larger housings will make more power but you get into some strange territory with a large A/R T3.
Its now a 5.3 with a 222/222 113 LSA cam and those same turbos. I imagine its putting out closer to 700 wheel.
The .82 A/R T3 would be my pick for a street driven 5.3. The larger housings will make more power but you get into some strange territory with a large A/R T3.
Little video of the gt35’s
https://youtu.be/BsMbAsd1BUo
https://youtu.be/BsMbAsd1BUo
06-14-2018, 12:07 AM
#39
These are t3 .82 and I have 3” down pipes, I’m going to try my damndest to run a 10’second quarter on stock cam and stall, I think that would be pretty damn impressive. I plan on putting it up to 15# at the track and try and accomplish that. My last car was a 6.9@102 1/8 car and I swear this thing pulls as hard or harder in its current form, before I turn it up. I have a cash days even the 23rd and then I’m going to the track the following weekend
lol , I just found it now that you posted this. Thanks though, I think I might just go with the .82 a/r myself.