yes.

 

I have a few quick questions:

How long did it take you to port it?
How much boost did you pick up with the same pulley?
Can you tell me specifically where you ported the blower?

Thanks!

 

thats my next upgrade... already running the water/meth inj 21 psi and 24 deg timing and no kr is a wonderful thing... still waiting on my exhaust to be finished because the stocker is holding me back greatly... 2.5 pulley goin on next week. anybody got some dyno number before and after ported s/c I want to see if it makes enough difference to do it.

 

jbp does this as well check them out

 

A) 600$ for your buddy to port a blower....? is he ******* nuts.
B) I dont see gaining 30 WHP from porting your blower.... He really is ******* nuts.

 

I know why Selfinfliction blew at 24 psi, but I swore to keep my mouth shut so I will. Let's just say I would take his setup in a heartbeat though!

 

the cracked piston was because of the coolant getting into the cylinder (we're pretty sure on that one) and the blower was a whipple. we've cancelled the project so i guess i can talk about it. we've lost alot of money testing this stuff out, and the shop isn't going to be selling something that puts your car on the verge of breaking just to make 320whp.

it sounds cool and all, and we *might* leave it on my car after we build it up, but it's not going to be for sale to the public. i thinkk we might just install a BFT on that car and call it a day. hell it's been down for almost 3 months now. and my other cobalt has a bad clutch, needs tires, and a new exhaust.... can't complain though, just broke 30,000 miles and i beat on this car since it had 11 miles on it

 

Damn bro... you think with built internals it would work though huh? which whipple did you use cause I was planning on going turbo next year, but I'd rather have an s/c.

 

it didn't have alot to do with the internals, the only thing that went is the headgasket, but when you start adding up the costs of the kit to make it run properly (roughly $3.5-4k cause of the custom parts required) and only getting 320whp out of it, there will be virtually no ROI for the shop or customer. especially when you have twincharged making more power than we did at lower boost levels(and alot cheaper). if there was a way to make that much power at lower boost levels, it probably wouldn't have been an issue, but even the whipples eat up power to make them work, not as much as eaton but it's still a good amount. and to compete with turbos we compensated by adding boost, which didn't work to well at the levels we needed it to.

 

ahhh so that explains it. thanks... Guess I"m gonna just go turbo then.

 

same here... i think i'm going to put a pretty good size one on the busted cobalt with a 50 shot or something to help spool it up, and the other one will be twincharged (if hahn ever releases the darn thing lol)

 

Which whipple did you use? I was looking at using the W100AX, but I saw the overall cost. You could be like the SRT'4s and just put a 50trim.

 

50 trim is the way I was planning to go... just got get the headwork, cams, block o-rings and pistons in so it might be a few months.. also gotta see what clearance is gonna be like.,

 

Good luck! I can't wait to see your results. I will not be switching to a turbo, as I HATE lag. If it was a track only car, I might use a little spray to help spool it. But since this car is my daily driver, I'll stick with the supercharger.

 

I'm not a big fan of lag either, plans are still up in the air unless a good s/c swap comes out or twincharging proves worthwhile

 

A blower swap will probably be more costly than a turbo swap, and twincharger probably will be too difficult to keep reliable.

 

Thats what I was thinking,, waiting until the 75ax comes out.

 

everyone is worried about lag. lag is almost non existant when setup correctly and with a good wastegate.

i'm just spraying to get it spooled up at low rpms.

 

Not correct. You can minimize lag if you go with a smaller turbo, but a smaller turbo will not make as much power. There will always be some lag with a turbo . There's 50 trim turbo's who've lost "short" races with stock turbo'd SRT's because of lag. You can try to minimize the lag with a proper setup, but there will always be lag. Coming from a V8, I want zero lag for my daily driver. Again, with any turbo that's a decent size turbo, (50 trim, T3/T4, etc), even with the right setup, tuning, etc, there WILL be lag.

 

Honestly, how can you even say lag is non existant? It has to build exhaust gases to spool. I want instant, like my belt driven blower. I can blip the throttle, and there will be an instant 16+ lbs of boost, and that's just with a blip. I'm at max boost as soon as I go wide open throttle. You CANNOT do that with a turbo. It will always take some time to get the turbo fully spooled, even if you do the right things to shorten the lag.

 

lag has nothing to do with the engine operating under the levels it has to be at to spin the turbo. lag is the mount of time it takes the turbo to start working ONCE you have reached the levels required to create boost with that system.

example:

a 60 trim on a little 1.4 liter hyundai might take until 4500 to start working, then it would take another say 1000~ rpm to be fully spooled. the lag would be the 1000~ rpm between the time it physically reaches the point of being capable of spinning it, to the time it is fully spooled. a good setup and wastegate can take that time to minimal levels.

the 4500 and below rpm has nothing to do with turbo lag.

that's just some numbers thrown out there and for example only.

as for the max boost.. what abou tthe twin scroll turbo on the solstice motor that is at full boost starting at 2000 rpm?

 

They do say that the max torque of the Solstice GXP comes in at 2000, but you're not seeing my point. For instance, the only reason I see to switch to a turbo, is if you're wanting to make big power. The stock turbo on the GXP is not going to be big enough to make a whole lot more power than stock. You'll see, people will have to switch to bigger turbo's to start going fast. Atleast for me, the stock 260hp isn't enough . That's when you'll start to see lag. Putting a 60 trim on a 1.4 will have lag just like a 50 trim will on a 2.0-too much. To use any type of turbo that will make significant power, there will lag, and that's my point. Sure, you can use a smaller turbo that will have very little lag, but then you won't be making very much power either. Since we know these cars can get to atleast mid-high 12's with the stock blower, you obviously want to be in the high 11 sec range if you're wanting to switch to a turbo. The size of turbo you need will mean lag. Again, we're talking different turbo's than small and stock size. Any turbo that's actually going to make good power will mean lag.

 

While I agree that if you want to go fast, the turbo is the way to go, the real point here is that there will never be instant boost (like you get with the supercharger) with a turbo. You can't compare the two when it comes to how instant it boosts.

 

we don't run full boost until higher rpms, i don't care if it's a 1.2" pulley. it will always build more boost as rpm's go up. we just get a little shot of the boost at lower rpms. i would take a stock 260hp/260tq form 2000-7000rpm ANYDAY over a supercharged, gradually increasing hp to 210~whp at 6500rpm. because at 2000rpm, i'm already making full power while the other car is still around 75hp or less.

the technology is there to get a good setup and near to no lag. it's just that most people don't spend the time and money to setup a system correctly, or they get some ridiculously big system that only makes the car good in the last 2000 rpm of the revs. you can take a small turbo and tweak it, just like we can a supercharger. we're limited more of what we can do with a roots blower than people with centrifugals and turbos because of the way it works.

don't get me wrong i like superchargers, but they just don't put out the power a turbo can. that 4000hp 4 cylinder twin turbo acura is a perfect example.

 

I've already agreed with you that on small motors turbos will make more power. But for fun driving, and a linear power curve with instant torque, the supercharger is where it's at.