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-   -   Twin gt35 5.3, couple questions regarding the ar (https://ls1tech.com/forums/forced-induction/1899502-twin-gt35-5-3-couple-questions-regarding-ar.html)

Y2K_Camaro 05-31-2018 12:56 AM

Twin gt35 5.3, couple questions regarding the ar
 
So I'm building a 5.3 swapped g body. mvb th400 with a t brake, Megasquirt gold box, 222/226 .603/.595 114+3 cam (it was ground for a single turbo but it's in the car now so I'm rolling with it), head studs and a set of twins on 93 pump gas/meth. It's going to be a street/strip car with a little more focus on the "strip" side of things, 28" tire and undecided on gears at the moment. I want to run 9.99 or better in the 1/4, but the faster the better. I'll be using VS Racing twin billet GT35 turbos with a t3 flange and 1.06 ar. Viren from VSR recommended I use the 1.06 ar over the .82. My question is, who has used twin GT35s (or something similar sized) with a 1.06 ar on a 4.8/5.3? If so, what did you think about them? Dyno numbers? Track ET/mph? How much boost and what rpm did you see full boost? If you used them with the .82 or smaller ar, do you wish you would have used the 1.06?

Forcefed86 05-31-2018 01:07 PM

Is the 1.06 is a T4? I run the .63 T3's on billet 64mm GT35's and they are a light switch on a dumpy 8.9:1 5.3. I wish I would have went with the .82ar. But a T3 VS a T4 is a huge difference. Not sure I'd want a 1.06 T4 on it. Not aware of anyone running one on a gt35 though.

Cwarta 05-31-2018 01:19 PM

Interested in your results. Viren told me the .82 is what I wanted on a 5.7...... not sure why that would be if heís telling you 1.06 on a 5.3

Y2K_Camaro 05-31-2018 04:38 PM


Originally Posted by Forcefed86 (Post 19906220)
Is the 1.06 is a T4? I run the .63 T3's on billet 64mm GT35's and they are a light switch on a dumpy 8.9:1 5.3. I wish I would have went with the .82ar. But a T3 VS a T4 is a huge difference. Not sure I'd want a 1.06 T4 on it. Not aware of anyone running one on a gt35 though.

No Sir the 1.06 is a T3. I wouldnít think the spool would be so bad being T3, I just donít want to run out of steam on the big end of the track.

Y2K_Camaro 05-31-2018 04:40 PM


Originally Posted by Cwarta (Post 19906225)
Interested in your results. Viren told me the .82 is what I wanted on a 5.7...... not sure why that would be if heís telling you 1.06 on a 5.3

Odd. I told him I was going to run the .82 but I didnít want to run out of steam on the big end of the track. Thatís when he said heíd recommend the 1.06 ar. I donít think the spool would be so bad being theyíre T3 frame. But then agin this is my first turbo build so Iím unsure.

Cwarta 05-31-2018 05:03 PM

Forcefed ran some pretty good times with his baby a/r versions, my goal is 9ís also with my setup. From what I was told these should make plenty of power to get me there. Fingers crossed for both of us lol

Y2K_Camaro 05-31-2018 10:20 PM

Well I guess either ar will get me to my goal. If I go 1.06 then I'll feel better about upgrading in the future. Maybe a 6.0 or even a forged 370 so I can really turn the wick up. Definitely fingers crossed for the both of us! I guess when the time comes to order, I'll confirm with him if I need the 1.06 or .82. Hopefully more people will chime in with some results.

Forcefed86 05-31-2018 10:41 PM

Stock48 ran gt35s? I missed that one... got a link?

Its mainly just going to effect reaponse time. The exh wheels are done on these with a 5.3 around 850 and thats tapped with a manual trans. pushing it well past its happy spot. U cant just slap on a larger housing and expect it to make more on a larger engine with a baby exh wheel.

Cwarta 05-31-2018 10:42 PM


Originally Posted by Y2K_Camaro (Post 19906496)
Well I guess either ar will get me to my goal. If I go 1.06 then I'll feel better about upgrading in the future. Maybe a 6.0 or even a forged 370 so I can really turn the wick up. Definitely fingers crossed for the both of us! I guess when the time comes to order, I'll confirm with him if I need the 1.06 or .82. Hopefully more people will chime in with some results.

i pan to take mine out this weekend, Iíll have some data on spool time and driving characteristics. Iíll post some videos and data In my build thread, and I can here if I remember lol

Cwarta 05-31-2018 10:49 PM


Originally Posted by Forcefed86 (Post 19906513)
Stock48 ran gt35s? I missed that one... got a link?

Its mainly just going to effect reaponse time. The exh wheels are done on these with a 5.3 around 850 and thats tapped with a manual trans. pushing it well past its happy spot. U cant just slap on a larger housing and expect it to make more on a larger engine with a baby exh wheel.

doh. I meant you lol. My bad.

Y2K_Camaro 06-01-2018 12:49 AM


Originally Posted by Forcefed86 (Post 19906513)
Stock48 ran gt35s? I missed that one... got a link?

Its mainly just going to effect reaponse time. The exh wheels are done on these with a 5.3 around 850 and thats tapped with a manual trans. pushing it well past its happy spot. U cant just slap on a larger housing and expect it to make more on a larger engine with a baby exh wheel.

Ok so staying with the 5.3, will the 1.06 ar be fine with a t3?

Y2K_Camaro 06-01-2018 12:50 AM


Originally Posted by Cwarta (Post 19906515)


i pan to take mine out this weekend, Iíll have some data on spool time and driving characteristics. Iíll post some videos and data In my build thread, and I can here if I remember lol

That would be great man, thanks!

Forcefed86 06-01-2018 07:34 AM


Originally Posted by Y2K_Camaro (Post 19906339)

No Sir the 1.06 is a T3. I wouldnít think the spool would be so bad being T3, I just donít want to run out of steam on the big end of the track.

I wouldn't worry about the 1.06 T3 then. Id like to see a pic though next to the standard T3 housings. I didn't know such a thing existed. (not that I'm in the loop on china turbos) I'm kind of weary when it comes to china stuff and AR sizes though. Seems like they just make $hit up! :lol:

Here was my ".84 housing" T3 that came on my 72/68 REV9 turbo next to my .63 T3 gt35... It's friggn huge! Easily larger than the 1.0+ T4's i've played with.

https://i.imgur.com/M1VkTKh.jpg

Y2K_Camaro 06-01-2018 02:53 PM


Originally Posted by Forcefed86 (Post 19906637)
I wouldn't worry about the 1.06 T3 then. Id like to see a pic though next to the standard T3 housings. I didn't know such a thing existed. (not that I'm in the loop on china turbos) I'm kind of weary when it comes to china stuff and AR sizes though. Seems like they just make $hit up! :lol:

Here was my ".84 housing" T3 that came on my 72/68 REV9 turbo next to my .63 T3 gt35... It's friggn huge! Easily larger than the 1.0+ T4's i've played with.

https://i.imgur.com/M1VkTKh.jpg

Good Lord thatís big! So I guess the 1.06 it is then. Iíll post some pics when they show up and maybe you can get an idea of how big they are.

Cwarta 06-03-2018 02:30 AM

Well I tried to get done useful data today. Unfortunately about the 3rd pull in while dialing in my afr it decided to blow through 2nd gear. 80e with hd2 kit. 8# 14*. Iíll say this, they spool a lot slower than I was expecting. Iíll hsve the trans rebuilt and t brake in in tomorrow, then I can post some videos. All I have now is a 1st gear pull with a failed attempt at a 1-2 shift at the end haha

Forcefed86 06-03-2018 10:23 AM

Trans slipping and not loading the engine could have a lot to do with slower spool. Sounds like something wasnt right in there. Also 8lbs and 14* is pretty mild timing. What are you running from 1 to 5psi? Should be able to run darn close to na timing to 5pi or so to help light them off. Then drop the timing hard after depending on ur combo and fuel.

Cwarta 06-03-2018 10:42 AM


Originally Posted by Forcefed86 (Post 19907723)
Trans slipping and not loading the engine could have a lot to do with slower spool. Sounds like something wasnt right in there. Also 8lbs and 14* is pretty mild timing. What are you running from 1 to 5psi? Should be able to run darn close to na timing to 5pi or so to help light them off. Then drop the timing hard after depending on ur combo and fuel.

Yea just trying to be safe. Afr was mid 12ís till about 3-4# then drops to 11.0, was running about 20* untill 2-3#, tapers down to 12* at 4K rpm and then back up to 14* by 5500, shifts at 6500. It was going pretty rich still after about 5,500. Was getting into the high 9ís for afr. I have 3.73 gears and 28ís.

Y2K_Camaro 06-03-2018 11:01 AM


Originally Posted by Cwarta (Post 19907614)
Well I tried to get done useful data today. Unfortunately about the 3rd pull in while dialing in my afr it decided to blow through 2nd gear. 80e with hd2 kit. 8# 14*. Iíll say this, they spool a lot slower than I was expecting. Iíll hsve the trans rebuilt and t brake in in tomorrow, then I can post some videos. All I have now is a 1st gear pull with a failed attempt at a 1-2 shift at the end haha

Well I appreciate you trying to get some data. Iím anxious to see you get it fixed and get some better pulls in.

Cwarta 06-03-2018 01:02 PM

Well I canít upload a picture for some stupid reason, gets to 99% then says data error. Anyways.

looking at my log right now. Dead stop, bring the car up on the converter as much as I can untill it tries pushing through, so about 1600 or so.

Key on ignition off is 92kpa. Anything above that is boost, correct?

afr at this point is 13.0
timing 27*
Let go of brake and mash it, at 4mph and 1648rpm Iím at 93.9 kpa, 21*.

10mph and 2408rpm Iím at 95kpa and 12.70 afr. And it takes off from there. Hopefully any of this helps.

trans is on the bench torn apart, installing the brake and rebuilding it and hopin he car is back on the streets today.

Also so for all of this info keep in mind i have the stock cam and stock 80e converter.

Forcefed86 06-04-2018 08:16 AM

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.


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