Gt35R with 0.82 A/R

[Maglin]

just to give everyone what is possible saying the driver is good.. So this could be considered the baseline. Curt brown in his 90 AWD talon never made more than 600hp but ran a 9.4 @145mph. This was on a built 2.0, lightweight car, stock ecu with a VPC and an AFC. A gt -14 sized turbo (or fp3065) which is smaller than a GT35r. Same comp wheel, smaller turbine wheel. Now, how is a gt35r not capable of mid nines? unless you are admitting you cant drive good and just want to blame the turbo?

Mark
SBR

Mark,
I'm not looking to get into a flame war or anything. And I did say 9's is possible with a 35R. It's just going to be pretty hard. And 500ish pounds is a pretty good amount of weight. Also to be in the 9's will require a cage which will of course add more weight.

I personally would not buy a 35R with the assumption of running 9's with it. Garrett rates the GT3582R as a 600 HP turbo which is what it is. They rate the GT4294R as a 850 HP turbo. Now I'm sure you are not going to want to run a .94 AR TH. But more likely the .82 hotside. I'm just saying what is on Garrett's site for their turbo's. I'm giving my advise as to what I would run. Their is only 1 GT35R in the 1/4 database here that is in the 9's. Jason's TSi which was also on nitrous.

 

[v2ner]

There are many 35Rs in the 9s w/out n2o but are not on here. Many have also moved up to bigger turbos though.

 

[oztofrdm]

well if you are dead set on 9's NO nitrous check out a BB 67mm turbo. Leesgsx just ran a 9.61 no nitrous on his first trip to the track this season. Ill let the video do the talking http://www.youtube.com/watch?v=oM3YEfAAfBQ

His is auto if you didnt watch the video

 

[GVR4592]

A higher compression forces exhaust gases out at a higher pressure, so the exhaust gases have a higher velocity as they leave the cylinders. How does this not increase spool?

Compression happens on the compression stroke not the exhaust stroke, so how would that effect turbo spool?

 

[VtecRex]

Compression happens on the compression stroke not the exhaust stroke, so how would that effect turbo spool?

I am not sure, but logically speaking, if there is a smaller amount of room in the cylinder, even on the exhuast stroke (which is identical to the compression, just with the valves open) then there would be more pressure forcing it out. Right? So does this mean that a higher comp piston make it spool faster? is it worth it? Would 8.8's (not sure exact numbers, around there) be to much?

 

[12's]

I heard the turbo exhaust housing has the biggest effect on spool up. I had a T3 82ar housing on a 60 trim I used on a stock 6 bolt and had 25pps by around 5000 or so. I expect about the same spool up on my T3 GT35R with the 82 AR exhaust side. It should be a little sooner as it is BB, but I don't expect it a lot sooner.

 

[Lottaboost]

I've got a 35R with the .63 housing on a 2.3.

The .63 is very responsive and I'm considering going to a .82 and my car is a street car. It won't be fully tuned for a week or so. So in saying that I can give you a full boost spool RPM but if you are looking to go real fast with a 35R I would suggest the .82 or the rare 1.01 T3 divided housing.

Or go with somthing more like a 37R. Precision will put one together for you I beleive.

I'm considering that (37R) or a 40R for next year
It's time to step it up....the 35R is like the 50trim for stroker guys!



just my thoughts

 

[Verticaljump1]

I know this thread is a little old, but I would go with a T-67, .58 or .68 A/R hot-side, and a p-trim wheel. As everyone said I would ditch the 264's and go with a crower 64414/FP3 and up cam. The 35R has gone single digits several times, but the goal will be much more realistic with the t-67. You won't spool till around 5K, but the car will make up the lag with a nasty came and some good boost (33-35psi). High compression pistons won't make a difference unless you want more off boost torque, that's all you feel on the street anyways. Typical numbers for a T-67 around 33-35PSI is around 630whp (give or take), you can run around 38-40PSI as long as your maps are good and you'll make pretty close to 700whp, that'll get you single's with good driving. I'm not trying to discredit anybody, or praise my thoughts, I'm just telling you what I would do in your situation. Good luck and I hope I helped...

 

[1g4my2g]

We all know that it takes many many things to run single digit et's and horsepower is only one variable. The guys that are going that fast down the track have the traction issues pretty much nailed down. This is why someone with a 16g baffled the world and ran mid 10's! But realistically a GT35R is more than enough to get you there if you follow the rest of the recipe. With Bigger turbos comes bigger problems. This is also as you all are probably aware why single digit mustangs won't race the AMS crue on the street. They are smart enough to know that they will get killed by the traction!

 

[v2ner]

I'll bet they suggested using slicks against AMS but AMS didn't want slicks whatsoever as this is also the case for many in this racing scene. That's why the rest is called "wrong" wheel drive while we're AWD.

 

[tstkl]

Compression has almost no effect on turbo lag, it does have an effect on off boost torque, which some people mistake for a quicker spooling turbo.

I would think that a higher exhaust gas velocity would cause the turbine wheel to be accellerated faster. The higher compression ratio SHOULD lead to a larger force behind the exhaust gases, and therefore a higher exhaust gas velocity. It should THEORETICALLY spool faster.

 

[2gGSX]

Mark,
I'm not looking to get into a flame war or anything. And I did say 9's is possible with a 35R. It's just going to be pretty hard. And 500ish pounds is a pretty good amount of weight. Also to be in the 9's will require a cage which will of course add more weight.

I personally would not buy a 35R with the assumption of running 9's with it. Garrett rates the GT3582R as a 600 HP turbo which is what it is. They rate the GT4294R as a 850 HP turbo. Now I'm sure you are not going to want to run a .94 AR TH. But more likely the .82 hotside. I'm just saying what is on Garrett's site for their turbo's. I'm giving my advise as to what I would run. Their is only 1 GT35R in the 1/4 database here that is in the 9's. Jason's TSi which was also on nitrous.

Just as a note, that is not how Garrett's nomenclature for the GT series turbos work. The 82 and the 94 stand for the compressor exducer diameter in mm, not the A/R of the turbine housing.
http://www.turbobygarrett.com/turbobygarrett/tech_center/gt_basics.html

 

[Kevin Jewer]

I might as well add my experiences to this thread as well, despite it's age. Apparently some poeple do search and find these old threads.

I ran the GT35R compressor side with a Mitsu hot side, TDO6H in a 7cm housing. 25 psi by 4400 rpm on a 2 liter. For comparison a friend with an identical setup was getting 25 psi at 4500 on a 2 liter with a GT14 from SBR, so similar results. Then going to a stroker I got 25 psi by 3700 rpm. I have heard from enough people to conclude that a full garret 35R in a 63 housing would have almost identical boost threshold. For a stroker I would absolutely recomend the larger 82 housing! That extra 15-20% airflow needs to get out of the motor

The next logical step for me was a T67, as also mentioned above. Mine was in an 82 housing with an O trim turbine wheel. Full boost on the stroker was in the high 4000s, 4800 or so. Nitrous would have been awesome for this setup, but I wasn't into it back then. The T67/TO4R wheel will move 75 lbs/min compared to 65 lbs for the GT35R, so it's a nice increase, but not too big. Of course it will take nearly 40 psi to max it out on a stroker though, so it's still a pretty big turbo.

In another example, 60-1 on a 2 liter. Going from a .63 to a .82 housing cost 200 rpm in boost threshold. Not too bad a tradeoff for the added top end capacity, and reduced tendancy to knock on pump gas (anytime you increase flow (VE) without raising boost, you'll be much better off, on pump gas).

 

[Slippi84]

I might as well add my experiences to this thread as well, despite it's age. Apparently some poeple do search and find these old threads.

I ran the GT35R compressor side with a Mitsu hot side, TDO6H in a 7cm housing. 25 psi by 4400 rpm on a 2 liter. For comparison a friend with an identical setup was getting 25 psi at 4500 on a 2 liter with a GT14 from SBR, so similar results. Then going to a stroker I got 25 psi by 3700 rpm. I have heard from enough people to conclude that a full garret 35R in a 63 housing would have almost identical boost threshold. For a stroker I would absolutely recomend the larger 82 housing! That extra 15-20% airflow needs to get out of the motor

The next logical step for me was a T67, as also mentioned above. Mine was in an 82 housing with an O trim turbine wheel. Full boost on the stroker was in the high 4000s, 4800 or so. Nitrous would have been awesome for this setup, but I wasn't into it back then. The T67/TO4R wheel will move 75 lbs/min compared to 65 lbs for the GT35R, so it's a nice increase, but not too big. Of course it will take nearly 40 psi to max it out on a stroker though, so it's still a pretty big turbo.

In another example, 60-1 on a 2 liter. Going from a .63 to a .82 housing cost 200 rpm in boost threshold. Not too bad a tradeoff for the added top end capacity, and reduced tendancy to knock on pump gas (anytime you increase flow (VE) without raising boost, you'll be much better off, on pump gas).

Are you implying your friend has a gt14 with a t3 housing?

I have a gt14 as it comes usualy with the bolt on hosuing and it is a .63a/r.

 

[Kevin Jewer]

The friend has a straight GT14, bolt on turbine housing. What I meant by the next statement was that I heard from other's with .63s that were getting similar boost threshold numbers. If the SBR housing is also .63, then that makes sense.

 

[Slippi84]

The friend has a straight GT14, bolt on turbine housing. What I meant by the next statement was that I heard from other's with .63s that were getting similar boost threshold numbers. If the SBR housing is also .63, then that makes sense.

Yeah the diffrence between the .63 bolt on and t3 isn't diffrent in spool. I wonder how much diffrent top end power is. Everyone loves to go yeah i ditched my bolt on for a t3 well I can't see the t3 housing with the same a/r makin any more then 10 or 15 more hp.