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Which Blower Size for my 427??

 
Old 02-24-2018, 08:50 PM
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AltitudeCO
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Default Which Blower Size for my 427??

Hey guys,

I would like some input on which Vortech head unit size/pulley you guys would recommend:

Current setup: 02 c5 coupe, m6 21k miles, ls7 clutch

LS7 based wet sump 427- 11.3:1 compression
-LS7 block; Eagle crank and rods, forged pistons with valve reliefs
-Texas speed LS7 heads, LS7 intake manifold
-Cam: 226/238 .598/.603 118+4
-ARH 1 7/8 headers, c5z titanium catback, 3.73 RPM diff, LPE mini tub, Wilwood brakes

I bought this car 6 months ago from a forum member local here in Colorado. He built this vette as more of a road course application, however I think it could be a great candidate for a nice centrifugal SC.

My goals are just spirited mountain driving, highway pulls and 3-5 times a year road course and Bandimere drag test n tune nights/ 1/2 Mile event in colorado springs. I am going for reliability and simplicity. I have had a 900+ whp YSI TA, single turbo c5z (800+whp e85), cts-v v1 paxton 1500(670whp), turbo jeep srt8 and V3 supercharged c6z (700whp). By far the most reliable and easy setup was the c6z (15k miles on build) and I am trying to replicate that, but I am shooting for a little more hp.
My hp goal is around 800+ (as you may know CO loses a lot of HP because of altitude 8000+ DA sometimes at the track). I don't mind too much about hp #'s as much as reliability, reduced belt slip and minimal complications.



I know the compression is a little high for a boosted application, the cam is also extremely mild but hopefully will be decent with a blower.
Just curious what you guys would suggest for a Vortech blower size and pulley, right now I am leaning towards the Ti with 8-rib Aux drive, meth and hold off for fuel- e98/clutch until next summer. The forged motor could probably be pushed a little further but I don't know if a YSi is worth it at this power level?
Any input is greatly appreciated-

Last edited by AltitudeCO; 02-24-2018 at 08:54 PM.
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Old 02-26-2018, 06:20 AM
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You seem to have some experience already with all those previous car and superchargers before. It's said the sky is the limit but I say is $$$ Benjamin.
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Old 02-26-2018, 10:56 AM
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Ysi...
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Old 02-26-2018, 12:58 PM
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Originally Posted by typeav View Post
You seem to have some experience already with all those previous car and superchargers before. It's said the sky is the limit but I say is $$$ Benjamin.
Yes I have some experience but I've been out of the game for a little bit and would just like other's opinions. Don't want to spend $ twice.
Since I did not build my motor and the compression is a little high just wanted to see what people's thoughts were?

I have read multiple posts regarding the YSi vs Ti debate, why do you think YSI? I am all ears
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Old 02-26-2018, 07:14 PM
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For 800rwhp or higher need to start with Ysi and don't look back. Especially since you have crazy high DA's to fight with.
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Old 02-27-2018, 08:29 AM
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It's a 427...anything less than a YSi would be pointless.

And there arent any sensible options larger than a YSi yet unless the ones ECS mentioned are available.
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Old 02-27-2018, 09:45 AM
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Originally Posted by stevieturbo View Post
It's a 427...anything less than a YSi would be uncivilized...
Fixed...

11.3:1 is a little high for a boosted engine using pump gas. But it has certainly been done successfully.

Best of success with your project.
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Old 02-27-2018, 12:22 PM
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Originally Posted by Capthuff View Post
Fixed...

11.3:1 is a little high for a boosted engine using pump gas. But it has certainly been done successfully.

Best of success with your project.
Thanks guys, ya I don't want to have to switch blowers this winter when I want more power. Do you think going e85/98 right off the bat would be wise?
How high do you think that compression can be pushed on 91 with meth? I'm not looking to break any records, just trying to find a happy median without having to replace drivetrain stuff (besides clutch). I know what other threads say with stock 427's or fully forged RHS blocks but this motor is a little different.

Last edited by AltitudeCO; 02-27-2018 at 12:23 PM.
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Old 02-27-2018, 12:58 PM
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As long as the tune is spot on, 91/meth should be fine at that compression... I would, however, suggest going E85 from the start. E98 would be even better, but that gets expensive.
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Old 02-27-2018, 03:58 PM
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If you were only sticking to 10psi or so then 91/M would probably be fine.

If you have E85 available to you then that would be a no brainer.
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Old 02-27-2018, 04:43 PM
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Ya E85 is definitely the safer route, only problem is I won't have a flex fuel sensor and here in CO we've seen as low as 55% content which is dangerous. 55 gallon drum of E98 is 3.10/gallon so not horrible. I'm wanting to stick with 91/meth if at all possible

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Old 02-27-2018, 04:48 PM
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YSI, ignite red, meth, and let her eat.
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Old 02-27-2018, 08:45 PM
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Originally Posted by algZO6
YSI, ignite red, meth, and let her eat.
Saw your 160 run, how far are you pushing that Ysi? Looks like a great setup
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Old 02-27-2018, 11:38 PM
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Originally Posted by [email protected] View Post
For 800rwhp or higher need to start with Ysi and don't look back. Especially since you have crazy high DA's to fight with.
You will love the YSI.. Please it love to be over spun for getting a good 1,k to the rwhp. Just need to put a D/nozzle meth to her also.... Robert
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Old 02-28-2018, 10:07 AM
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If you decide to go pump/meth, I have a buddy selling a really trick complete meth tank/nozzle setup. It’s in the FS section.
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Old 02-28-2018, 11:30 AM
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Originally Posted by AltitudeCO View Post
Saw your 160 run, how far are you pushing that Ysi? Looks like a great setup
8"/2.6" pulley combo shifting at 7k. was having some serious converter issues but all is taken care of. running at All Out Call Out in June. you should drive down and check it out.
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Old 02-28-2018, 01:17 PM
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Originally Posted by algZO6 View Post
8"/2.6" pulley combo shifting at 7k. was having some serious converter issues but all is taken care of. running at All Out Call Out in June. you should drive down and check it out.
June 9 in Albq, NM? That is an easy drive for me, I'll definitely take some videos for ya
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Old 02-28-2018, 01:46 PM
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Originally Posted by AltitudeCO View Post
June 9 in Albq, NM? That is an easy drive for me, I'll definitely take some videos for ya
that would be the one.
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Old 02-28-2018, 03:10 PM
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Anyone running the Vortech Ti (1450cfm) head unit? I would like your opinion/review?
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Old 02-28-2018, 03:27 PM
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Originally Posted by AltitudeCO View Post
Anyone running the Vortech Ti (1450cfm) head unit? I would like your opinion/review?
If you want to run a Ti get a V1 or V2 that is engine oil fed and then you can spin it harder than a V3 and make more peak power. I've seen RMCR use a V2 Ti and make 800rwhp on LS7 with 93/meth. Then later that same car made 900rwhp using E85 & meth on top. The engine oil fed is the way to go if you want to max out any headunit.
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