ya, i don't know why you got rid of the meth....you said cause you're in rod busting territory but you do know you can use a meth system for the octane and engine protection without cranking out more hp don't you? Meth would actually make your power levels SAFER with the added cooling and octane.

 

I could just keep the timing somewhat low and not have to depend on a meth system. I dunno, I just had so many issues with it and the guy who bought it was an easy way out for something I really just didn't need.

 

Are you on a stock block? Meth is pretty simple to use. It's a great way to prevent detonation also.

 

Not just rod busting, but your rings... with high compression at that level of boost you need all the cooling you can get, regardless of detonation. Stock rings = crap

 

im amazed its holding up to 17psi on stock block

 

So why do people upgrade to this impeller? Why not just upgrade to a T-trim through Vortech?

 

I thought about it...but I would have to change out my intake because the T-trim has a larger inlet and I just wanted to give the 928 impeller a shot as I BELIEVE it could be even stronger than a T-trim.

 

Meh...keep in mind it goes to 17psi at 7Krpm. At 6000rpm it's maybe at 14-15psi and below that...well....you get it. A turbo setup at 17psi will make FAR more power and torque than my vortech will.

 

Well it looks like you did get a pretty large increase in boost . I have a custom intake on my SC-trim and I am debating between impeller upgrade or full blown T-trim...Keep up the good work!

 

I'm only making 11psi with a 2.87 @ 6600, you are still making a pretty big jump. I would think you would wanna do the meth as you are prolly blowing a lot of heat. I'm still amazed you are doing this on a stock block. I thought you were having issues with your blower making noise, did you get that fixed? You seem to know what you are doing but you have more ***** that I do with running that thing so hard without a full tune by a professional. Looking forward to your dyno numbers, how much was that intercooler and where did you get it? Is it the same one oldmanZ has?

 

I dunno, maybe in hind sight I would have gotten a T-trim but the 928 one so far feels great so I can't complain. The install was a PITA though.

I have a HUGE intercooler so meth for me was more of a hassle than anything else. Yes, it would make it safer but I feel it's not really needed and it's just one more thing that could fail at any time. My temps are lower than ever now. I'm pushing a MAX of about 145* at 17psi after a LONG run... before I would push 150-160* after a long run at only 12psi. I bought the intercooler on ebay. It cost about $250 shipped I believe. 32x12x4 bar and plate.

My blower is still making noise...lol. I have to order some bearings. I'm just going against my better judgement and beating the crap out of it like this.

 

be careful. A bearing failure will take out your $500 impeller too! Volute will get messed up as well.

 

I know, I'm just doing this till tomorrow and then I'll remove the belt for sure.

 

even with the cooler temps it is better to have more octane than you need. Lowering timing to keep from detonating is a cheap fix that will cause your EGT's to rise so it's not really recommended to just keep backing off of timing.

too late to mess with it now, but i think it would have made your setup much safer on that stock block.

and also, for whoever asked why not get a t-trim, there is a nice difference between a 500$ impeller and switching to a 2000$ t-trim plus the upgrades in piping.

 

I was under the impression that a T-trim is $800 exchange through Vortech? If I am wrong then obviously the impeller is a better choice, but if that is in fact the price I would think having a physically larger, more efficient, professionally assembled blower for $800 seems like a good option.

 

1300 + shipping costs is the upgrade package cost for a T trim. The T trim will always make more whp than the impeller upgrade.

 

Proof?

According to 928 ( of course, they are the vendor ), their impeller will outflow a T-trim.

 

I am quite certain that one of, if not the highest whp Vortech is on the 928 impeller. I believe there was a thread with a comparison of the Motordyne XYZ pipe a while back that was in the mid-500whp range.

Either way, something must be up with the installs or because I never had problems installing mine. I had my impeller swapped on the dyno in 30 minutes. Granted my supercharger was in a different spot than everyone else's.

 

I would agree that it is going to be apples to apples at least.

The SC-Trim flows 1050cfm while the T-Trim flows 1200cfm. The impeller upgrade did see a 15% increase in boost at the intake manifold on my car. Since boost is a measure of restriction it isn't entirely good for flow calculations but that percentage would put it in the same ballpark.

 

Took my car to the dyno today...you be the judge.

It not the dyno where I got the 402whp on. On this dyno I had gotten 389whp with the same identical setup I got on the 402whp run. Today I got 417whp and 339wtrq. This would be a 28whp gain. My IDc were at 100% though and after 6500rpm or so my A/F would just go up to the mid 12's. I stopped tuning it because I didn't want to have to do it again once I get the new injectors, I just ordered a set of 750cc injectors. I believe I can get 420whp or more once I'm done with a prettier graph. My belt also seems to be giving out because sometimes my boost would behave kinda weird and sometimes it wouldn't go past 15psi. On the 417 run it peaked at 16psi.



Anyways...the belt comes off today and once I get everything fixed ( bearings and injectors ) I'll try again.

Considering my car is 5AT with heavy 20" wheels...I think 417whp is okay. It would be about 440+whp on a 6MT and maybe more with lighter wheels.