AltitudeCO

Yes I am working with RMCR, I have known Mike and Mark for a long time they are excellent, wouldn't take my car anywhere else.
They are suggesting Ti V2, that black c6 they built is a monster with the Ti (970whp on e98). My goal isn't much above that 800 mark, is there much difference in low end power at that HP with the two blowers from your experience?
I know obviously you wouldn't have to push the YSi as hard but just curious with drive-ability and reliability on the 8-rib?

Josh@AandASuperchargers

Probably pretty close to the same TQ and it will be a lot. 8-rib combined with our 2nd drive and it will be good to go.

Turbo-Geist

Why would anyone not choose a YSi for a 427?

I think you answered your own question between the Ti and YSi. The Ti is going to be working in its upper range to deliver the power you are looking to make. You could pulley the YSi to deliver a good torque curve and then use a restrictor to keep it in your desired 800ish range.

If the need ever arises for more power, you will have it with the YSi vs needing to buy another head unit with the Ti.

AltitudeCO

Blower is officially ordered. YSI- 8Rib, Aux drive

Thanks for all your help guys, I will keep you posted on the progress of the build

Rkreigh

go e85 and a flex fuel sensor from the start.

I'm going with a Haltech, and the Elite stuff supports drive by wire, 8 channel egt, dual WB, and I'm going to use a amp driver box to control meth injection on days when I can't get E85

this gives quite a bit of flexibility. Another option is to go direct port meth and tune that with a wb for best performance. It's realtively easy to go "dual fuel" and have the nice pump gas manners and juice it when needed on boost

I think ECs has a bigger blower that is more streetable than the YSI which wants to be driven hard to make the big power

I'd be careful running big hp with lots of compression, a mild cam and big boost as that's inviting detonation. With that much compression you can afford to bleed off some mid range where cyl pressure can spike and bend up rods or split the ls7 block

I'd go smaller bore, iron block and boost the snot out of it as it's cheaper and more durable for high compression and big boost'

the smaller bore sizes support stronger block that doesn't move around so much at big hp

good luck, should be a hoot and spank out more than enough to go to zero to jail in nothing flat

Water_Walker

Major caution against using RMCR.

AltitudeCO

Why is that?

c5mtl

Skip the ysi and go straight to the newer bigger vortech units or a procharger f1x.....427 needs a ton of air

stevieturbo

Probably more than he needs....but I like your thinking...

algZO6

once i get a few clean runs out of my ysi im going to upgrade as well.

AltitudeCO

What size pulley would you guys recommend? Will the 3.33 be enough for that 12-14psi with my setup?

algZO6

go straight to a 2.70 just make sure you have a fuel system that can support it. your DA is going to kill your power, believe me im in the same boat.

AltitudeCO

Final results on the YSI build:

https://www.corvetteforum.com/forums...completed.html

AltitudeCO

Update Question:

I have been driving and enjoying the YSI setup so far. No issues with reliability, it is de-tuned quite a bit. I want to add some power down low and I have been looking at swapping to a smaller pulley (right now it is the 3.3 ) to up the boost. My fuel system is setup minus injectors.
Do you guys recommend going to E98? Get rid of the methanol?
I am hesitant because of the compression being high ??
I was also recommended going with a Brian Tooley stage 2 cam, any thoughts? (I definitely want more of a chop but don't want to go too far away from a boost cam)

stevieturbo

If ethanol is available, it seems that it and high compression go together very well !

So assuming your question currently relates to pump+meth ?

Also factor in you'll need considerably more fuel supply to cover the change to ethanol.

AltitudeCO

It is somewhat available, we have E85 but some of the testing hits sub 70%. We can get 55 gal drums of E98 pretty easy so that will be the route I would go. My fuel system is setup for E98 already.

Current Motor: 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
-PRC LS7 heads

My question more relates to pulley size and will adding more power be too risky even on E98 with my high compression?
My goal is more 1/2 mile and mile racing + highway monster. Not planning on breaking records here just want to keep reliability

Josh@AandASuperchargers

I'd recommend talking with your Tuner to see what his preference is out there. If you have enough fuel supply going to E98 would for sure allow some more timing and the ability to make some more torque down low and mid-range.

silver408z

I would be careful if you are actually on a ls7 block. They are not known for big power and the sleeves are known to crack.

ZincGT

Add the flex fuel sensor and run e85, not a big enough difference from that to e98 to have to only get fuel at your house. Ive tuned a lsx 427 with stock heads 10.5 compression with a ysi. It made 930 uncorrected with a 8"/3.0 combo on 16 psi.with pump e85.

AltitudeCO

UPDATE: Recently completed E85 conversion and upgraded shifter

I'm seeing about 60-62% ethanol according to innovate sensor
Decent gains hp/tq- peaked 950/800 ish