I want GT 35r but there so dam exspensive. What do you guys think of a SC61 on a stock bottom end evo.

 

its a good turbo, alot of success with the honda guys. I have one left at 725 shipped then they go up to 775 shipped. I was considering using one and I might still. its prob good for 500+ whp on pump/meth with 272's or 280's on a stock motor.

 

would you compare it to a gt35r

 

Actually, I think a SC61 is almost (if not) the same thing as a GT35R, but without the ball bearing center.

The drawback is that without the ball bearing center, it won't spool as quickly...and that is the downside of a GT35R as it is. AFAIK, SC61 will be worse, not better.

One way to look at things is consider the fact that to upgrade to a turbo this size, you WILL need to invest in more than the turbo. You'll need adequate supporting hardware if you're going to get your money's worth out of it, and that costs. When you consider everything you really need, that extra $700 for the GT35R suddenly doesn't make that much of a difference.

 

In terms of spool, the SCM61 is about as comparable to a GT35R as comparing the GT35R to the stock turbo. Well, maybe not that extreme but it probably goes from being somewhat tolerable with the GT35R to being untolerable with the SCM61

https://www.evolutionm.net/forums/sh...d.php?t=148783

 

I wish gt turbos wernt so much f**king money. I still think I will try the sc61 It should do what I want it to then I can get a gt35r.

 

Sure, it will do what you want...if you don't mind waiting until 6600rpm to get full boost.

Sometimes you have to realize that saving money now only ends up costing later. Good luck.

 

You really think it will take that long to spool? I am just wondering.

 

hello...there is real data only 4 posts up! That SCM61 is on my car, yes it does spool that slow from a 2000rpm roll in 2nd gear. If you want 25psi as you max boost, your not going to see it till 6600rpm.

Here is the SCM61 on my car in 2,3,4 gears. first gear doesn't get more than 20psi before I shift at 8000...just not enough load and time for boost to come up. I haven't tested 5th gear yet.

granted...the SCM61 is a differnt turbo than the SC6152. mine has the .6 bolt on dsm turbine housing, an SC6152 would be a T3 garret turbine housing. yours would have a different compressor wheel. It should still be in the ballpark with the SCM61 though. plus or minus a couple hundred rpm at most.

 

what kinda numbers are you making with it?

 

I have not really even tuned the car yet other than just "making it safe" for driving it.
The turbo went on the car about 2 weeks ago, but I have been too busy with my 1g talon racecar.

anyway...I have "dyno math" software for the AEM EMS datalogger, and when I last ran on AWD dynojet..the dyno showed 351whp (with the br440 on pump) and the AEM logger showed 356. So it's pretty close, within say 5-10hp.

The same math is showing about 385whp now with the SCM61 at 24psi on 93octane pumpgas. Torque is down to no more than 305ft-lb at any point. There is no boost down at where the engine would make peak torque.

The car has stock fmic, stock pipes, stock bov at the moment. As said before, I haven't bothered to fine tune it, as my next project will be to install a large fmic and make aluminum pipes with a tial bov. I also have a 2.5" intake pipe on the car, that should be increased to 3". Im also planning on picking up a alky kit from BR this weekend at the shootout. Once all of the parts are on the car, and Im not going to change stuff around again...then Ill make a serious effot to retune the ems. For now it is both laggy and slow.

 

The SCM61 has a completely different turbine wheel. It does not seem to make as much power as the GT35R however still is plenty for 500whp. I ran one on my old DSM with a bone stock motor which is inferior to the evo motor and made 487awhp. On a evo it should make over 500whp no problem however I don't think you will see the 575++ that people are seing with the GT35R.

I'm assuming you are going to use it with the Buschur manifold because if you are not you should just use the SC61 and I recommend it with the S cover.

 

propellerhead, why such jagged boost and 15 untill almost the end of your run?

 

My mods will be 272in 280 ex, Neukin.com egual lenght manifold, slowboy front mount br charge pipe, hks twin power aem ems and prob 1000cc injectors and some other things. Do you think it will build decent power? I don't mean to sound stupid.

 

The low boost was described in my original post but to clarify here it was set at ~17psi on that particular run since the motor and clutch only had ~250 miles on them at that point.

As far as the "jagged boost", bear in mind that the time span from when the boost levels off at 5,000 rpm and where the plot ends at 7,400 rpm is only 1.3 seconds. The sample rate for that log was around 9-10 samples/sec. There are 17 samples plotted for 24 100rpm breakpoints in that graph. Also, the fluctuations represented in those "jaggies" are 0.5-0.75psi variations. It's gonna look jagged no matter what and even worse with such low sampling rates.

Currently the car has a .5 bar wastegate spring and a Hallman MBC using the heavy spring. This probably isn't the most effective configuration for steady boost. I've got a .8 bar "big red" wastegate spring waiting for me at Mach V. The two together will add up to 1.3 bar (19psi). I'll throw that in and see how well the Hallman can regulate the boost when it's got a little help from the wastegate. Hopefully the creep will be under control.