Get it to hit 24psi @ 3100 and Ill become a believer of the good old Hahn S20G.

 

Heh lol.

 

lol, you wont find any turbo spooling that soon at that psi for 2.0. The physics arent there, an engine is a pump. A 2.0 wont move enough air/exhaust to get a turbo to spool to 24 psi that early. Anyone making real hp is seeing boost lag on the dyno at 4500 and on the street at 4000. Just thumb through the dyno thread pics, the graphs are at the end of everyones mods lists.

I can literally sit here and watch the car accelerate from 3000 to 4000 and as soon as my tach hits the "4" its like the batman rocket fired off in the back of the car.

Now what might make you a believer is that on a ported LSJ head I got the "good old Hahn S20G" to 27 psi before loosing horsepower at 28 psi.

Does 472 do anything for you? The fueling is different from LSJ to LNF but the strength of the LNF should allow for similar numbers.

 

LNF ported heads do **** compared to LSJ ones. How do you make less power at more boost? (Unless your knocking and pulling timing). Still not a fan of the s20g. Made almost equal power on the s256et except I was on pump gas. And even though its bigger than the s20g it comes in full boost at 3600.

 

I say that's impossible. I just don't think a 20g can spool that soon. Even then if it did you'd be spinning horribly. It'd be completely useless really.

Sent from my Samsung Galaxy S4 using CobaltSS

 

No knocking and I have graphs posted around here showing that I was 19 degrees up top. Could have made more power with timing but why, I am way over my original power goals. There are guys running 24 up top but I made all my power with just boost. That is how you make less power with more boost. Plus its cool to tell your ricer buddies you are running more boost on your 20g than they are on their dsm 20g. LOL JK

what psi is full boost? I make full boost at 1000 rpm if all i am shooting for is 5 psi.

Yeah lb for lb the 20g will make the same amount of power per e85 as the guys running 93. which is pretty interesting.

raver, i see your k04 graph in the dyno thread where is your s256et graph, i would like to see the spool.

 

As soon as I have something, I'll put it up. Trans grenaded last dyno session on race gas. New 4.45 is in.

 

well, after talking to Bill Hahn Jr (Hahn Racecraft) I noticed something. That in an all out run by the time you shift from 7000 and hit the next gear guess where your rpms are?....

4K, right where I am making max boost on the 20g (24-27 psi). Just saying from a street standpoint I am not WOT from a traffic light, lol and the car still has a loss of traction without getting into max boost in the first 3 gears I am still spinning tires.

I still love my 20g.

 

sorry to hear that, my trans worries me but so far its holding the power just fine.

 

I'm not dissing your car so don't take it personally. But there is a difference between positive pressure and full boost in. Looking at your graph you aren't full in until 4700 but yes u are making positive pressure at 4k. For what people pay for a bolt on the s20g is not bad but you get what you pay for. The turbos are old technology. They are laggy and their wheels don't flow as much air for their size as for their modern counterparts. That being said...yes they aren't an efr but they don't blow up like efrs either lmao.

 

I'm waiting for cmiller8006s dyno graph on the cae wheel 6262 I will put money that his turbo will spool equal to your s20g turbo. Which says a lot because the 6262 is ******* huge!

 

all true, but I am just not willing to try and go any bigger at the moment. I know I have pushed the 20g to its limits. There are much better turbos that is for sure. But as you said the 20g is built like a brick outhouse. I took it apart and thought no wonder this thing spools so slow, its heavy and an old journal design but man, I sure know its going to hold up when I beat on it.

I know it looks like 4500-4700 on the graph but you have to remember my dyno was loaded to its full eddy brake capacity. On the street its for sure hitting that at 4000. I can watch the car build power up to 4 and then all hell breaks loose. LOL

 

I can punch mine at 3000 rpms and see 25lbs but I'm not actually feeling power till around 3500. There's gonna be a bit of lag. Definitely with almost any turbo.

Sent from my Samsung Galaxy S4 using CobaltSS

 

Yeah I really think your graph is unfortunately a tad deceptive and people seem to be getting a little hung up on it. I can definitely agree with you that on the street the 20g will spool by right about 4k. My logs from a recent lnf I tuned with a 20g strapped to it back it up. To be perfectly honest though, and maybe I'm alone here, but I really wouldn't want to see 25+psi by 3k anyways. The amount of heat and dynamic compression it creates at that low of an rpm really just isn't a good idea. Oh and btw, for anyone who is spooling an efr6758 to 25-26psi before 3700rpm is surging the snot out of it. Just pull of the compressor map.

 

Lol. I was just being sarcastic.

 

Seemed pretty literal to me..

Plus this just unfortunately seems to be the mantra for just about every efr owner. OMFG every other turbo sucks because minz can hit 26psi by 3k just like the k04! Anyone who really wants that, good luck to you.

Not saying you specifically said or think that (although you sort of did.. lol), but that is basically the first thing that comes up whenever talking about that turbo. It's a good turbo don't get me wrong but at the same time I also don't think the 20g is nearly as bad as most try to make it out to be.

::flame suit on::

 

Hell I wasn't even going to get the zfr. I was gonna get the wr-3 and be another test subject for pwerks, but I stumbled upon one hell of a deal and said eff it. For what it is, I enjoy the turbo. It pulls hard the whole way to redline and has a sure way of surprising people. I'd love to compare it in person to a 20g or something else though just to see how it is. I don't think numbers can prove it.

 

#1 reason I went with the WR-3, it has lag, yes, but when it kicks in it pulls hard. Plus my numbers have been higher then any ZFR I have seen!

 

If you got this from who I think you did, then yes, you definitely got a pretty nice deal on it for sure.

I agree with that actually. An apples to apples comparison of the 2 turbos would be pretty interesting to see. The closest I can compare it to at the moment are my logs for a 25psi zfr tune vs a 24psi 20g tune I did. Even though boost levels are close, the tunes themselves are pretty differents. The zfr person (Cobalt) wanted a pretty aggressive tune while the 20g guy (HHR) really wanted something pretty mild but still moved out nice. With that said, the zfr does seem to flow a bit more air over the 20g in these logs, but again, they are 2 different setups in 2 different cars with even 2 different gearings (due to the final drive) so it's tough to call that an even steven comparison.

 

Oh I don't doubt one bit that your turbo will out flow a 6758 hands down. It is a touch laggy, but once you have the right setup allowing you to open things up in order to spin the engine to 7200-7400, that turbo will be nasty!

Touching on that. I know you have a built bottom end, but do you have any top end work done yet?

 

I have valvles, and valve springs. Don't have a ported head, will go with a set of cams over the winter. I have been talking with Ryan (sythe_snake) and he is testing a set of cams right now which I think is what I will go with

 

Ya those numbers are good, but you also have more done to your car than most guys (like me) who just put a zfr on so you really can't compare them evenly. One of these days I'll get my car on the dyno and be a number guy like some others and see what happens.

Like I told term, If I'm in the high 300s whp/tq wise, I'm happy with it. I've already put a confused look on my buddies face, who owns a 2012 5.0 with 432whp when I went by him from a roll. At the track though, he gets me no doubt.

More than likely, you're thinking the right person. From some of my logs, my car actually impressed Term. He was super happy with some of the results and I'm managing 4-sub par 4 seconds on some logs from a 60-100 roll.

If you know any from west central pa with a big turbo cobalt send them my way! I wanna see results and differences!

 

How much boost are you setup for? I'd be curious to see a log to compare to a couple of mine.

 

26lbs and it pulls so good and sweet.

 

I'd like to see some ZFR logs too . One I'd really like to see id kdubs wr3 logs.