I know this has been discussed a great deal but it is not entirely clear to me which turbo T60-1 or T62-1 would be more desirable on a stock port. Of course I would like a quick spool up and around 375-400 hp at 15psi. Assuming other factors are negligible:

At approximately what rpms will a T60-1 1.00 A/R p-trim divided reach 5, 10 and 15 psi?

At approximately what rpms will a T62-1 .84 A/R p- trim divided reach 5, 10 and 15 psi?

Any solid evidence in the form of datalogs would be appreciated, just send them to egg_one@yahoo.com

What would be the peak horsepower of each of these setups?


thanks

 

I hit 435@16lbs on a race port with a to4s which I belive is a 60-1 1.00 hotside. You can't run any single turbo at 5 lbs. 10lbs is the lower limit usually.

 

You just can't do that...
Porting affects boost ramp.
Gas type (i.e. octane rating) affects boost ramp.
Spark plug condition affects boost ramp.
Ambient temps affect boost ramp.
Humidity affects boost ramp.
Ignition timing (stand-alone ECU) affects boost ramp.
Exhaust system affects boost ramp.
Intake system affects boost ramp.
Intercooler type affects boost ramp.

I can go on, but I'm sure you get the picture.

Just because one person says it spools by xxxx RPM doesn't mean it'll apply to you also.


-Ted

 

With a stock port, I believe you will fall a bit short of 400 rwhp at 15 PSI.

If you plan on keeping stock porting, the 62-1 really is more flow than you need, so not much point in paying the extra dough for that. 60-1 is plenty o' flow for stock ports (or ported) and the 62-1 is just supposed to give a little more.....

I think that a 0.84 vs a 1.00 is probably a toss up considering that you've got stock porting, I might even recommend the 0.84. If you think you'll be porting the engine soon, definitely go with 1.00.

That's my $0.02

 

thanks guys for your replies...of course I'm looking for a theoretical answer...I would assume that the turbo manufacturers would be able to change wheels and A/Rs in order to develop different compressor maps...I am also looking for some real world data points or logs... certainly they will be affected as Ted has stated...but I'd rather make a decision based on some data than none

 

Please check out my little dyno page I keep at http://www.catenet.net/dyno.php

There are several T04S (60-1 basically) dynos on there for you to eyeball.

Brian

 

Brian,

I really appreciate your dyno site. I have printed out quie a few of the graphs. I have been comparing the RX6, 60-1 and 35/40. I have even drawn grid lines at various rpms. All 3 of these turbos have similar peak horsepower numbers. However, I didn't notice a 62-1. The idea behind the 62-1 was to use a smaller A/R on the turbine side (.84) to see of it would spool as fast as a 60/1 with a larger A/R (1.0 or .96). Anyway since peak horse is approximately the same for the RX6,60-1 and 35/40, I thought the faster spooling turbo may be the deciding factor for me. This was another reason I was requesting logs, it is a lot easier to see what the boost value is at various rpms.
Don't you have a 60-1, if you were in 3rd gear at 35mph (approx 3000 rpms) and floored it at what rpm would you hit 10 psi?

Anyway, thanks for the website, it's a very handy tool.

Dave

 

Yeah I don't think I have a 62-1... I wish I did! Anyone got one for me with a mods list and boost level?

 

Ive had two Turbonetics t62-1 turbos on two different FD's. Other than that I had an older cxracing gt35 (back in 2010). Both similar hotsides. The retailers for the Turbonetics wouldnt sell me a divided turbine housing that hurt. But its my favorite turbo out of the 2. 5 psi started at about 2000rpm by the time it hit 10psi it maxed out 14.5 at 4500-4600 rpm. On my second FD I was forced to become my own tecnician and I bought the cxracing gt35 pretty much went cheap on the manifold, wastegate, turbo and intercooler. Not cheap on fuel tho. I have multiple sets of stock injectors, a set of bored 850to1200cc secondaries, and a set of bosch 1600cc injectors. I have only ran these 3 turbos using 850cc x 4. Stock FPR is in currently havent had a chance to swap it with the VMS racing fpr kit. Aeromotive stealth 340phl fuel pump is in the tank. And apexi power fc for now so that i can monitor easy. I havent bought a datalogger kit yet thats why im staying at 850cc x4. I did one pull with the GT35 I was nervous because it was my first run on my first turbo self install I couldnt pay attention to gauges because inwas so shook concentrating on the road and first time driving the car for 2 years. My X fiance saw the boost gauge tho she said it read 13psi. Lol. First and only perceptions of that turbo, I like the turbonetics T62 better. The GT35 didnt even make the noises that my T62-1 made. The T62-1 isnt ball bearing but it sounds like a semi truck turbo even in the lower rpms. Like when you take off from a light next to a semi truck driver he looks down at you like 🤔. And the gt35 didnt punch as hard as the t62 either so... thats when I bought my second Turbonetics T62. Drove it a couple of times. But i moved to a different state shortly after that. The project has been on hold about 5 years now. Ill be back at it maybe at the beginning of 2022. I have lots of parts to install. Ultimately ill be converting to an HKS cast manifold and xs power LiM. I aim for good power, reliability and a quiet exhaust. Im sure the cast manifold should help the sound. I have read that the HKS unit flows well enough with the T62 same rpms and power as the $100 ss manifolds Ive used, some people have to boost creep (wastegate related) and larger turbine housings may have clearance issues .84 ar should be fine. There is a ball bearing verion of the t62-1 (may be called t62-2) it cost $450 more dollars and spools 450rpm quicker. I think it should be worth it. Im actually going to upgrade to the hurricane sylvia turbo ball bearing turbo with divide turbine housing. This is the dream for me. Also a thermal switch intercooler fan to the Intercooler. All will be done by the end of 2022.

 

sounds like a very lazy turbo to get 14psi at 4500 rpm...

 

20 years of advances in technology ftw!!

I'm not sure why anybody would go out of their way to buy old technology turbos these days..

Granted, this dude is also bragging(???) about using bored out ev1 injectors, running a PFC and wanting to buy CX racing parts... I feel sorry for that FD

 

speaking of which, the new Garrett G25-660 will flow same or better than the EFR7670, but in an EFR7173 package and MOI. The Garrett 0.92 A/R housing for it maxes at 24 lb/min while the BW 1.05 A/R housing maxes out at 25 lb/min, despite the much smaller Garrett turbine wheel, which is also rated for 1050*C. It should spool early like nothing ever seen before.

Or you can step up to the G30-660 which is same 60 lb/min compressor, but has a 1.01 A/R @ 28 lb/min max housing (new 30 size turbine that flows like the previous larger GT35 turbine).

IMO these are the new new standard once people catch on to them ... trying to directly compare turbine wheel size is no longer valid with them.
.

 

Yeah, I'm running an EFR 7670 in my new build and I'd love to consider the new G series turbos. If only they had an option for the standard 4-bolt twinscroll mounting footprint...