marco383

After a lot of soul searching, I made the decision to sell my 'Vette. As many of you probably realize, there isn't a lot of toy money out there, but I found a guy who's seriously interested. The issue: he wants a car that makes at least 900 RWHP on 93 octane without meth, and feels that mine has the best shot at achieving it.

The current details: C5R 427, Callies crank, billet rods LS7 heads, F1C Procharger and a few other goodies. C.R. is 9:1, and the car currently is producing 780 RWHP at 8 pounds of boost (93 octane, no meth) using 72 lb/hr injectors. I believe that pullying the blower up to 11-12 psi, increasing injector size, and retuning should get me to his magic 900 RWHP.

What am I missing?

HIGHRPM

I have a similar setup....427 C5R....F1R Procharger and at 14 psi boost I'm making 850rwhp....to make 900+rwhp you will need to boost to 16-17 psi and add meth...IMO 11-12 psi will get you to maybe 830/840 rwhp. Heat issues become more pronounced at boost goes up...... its not linear.

marco383

Thanks for the input. if I'm making 780 at only 8 psi (it actually did 788 on a slightly leaner tune), heat notwithstanding, how is it possible that I need an additional 10 psi to gain 120 RWHP? How well do your AFR 205s flow? The LS7s are around 370 cfm intake at max lift.

I really don't know why my potential buyer is so anti-meth. If I was to crank the boost up very much, I'd definitely go with it.

Years ago, I ran a 383 LT1 Camaro with around the same C.R. and a T-Trim Vortech at 16 psi without meth and it lived OK.

95wht6spd

Maybe he was once a "tweeker" and wants to stay away from the meth.

I noticed the AFR205s too, but they may have been hoged out.

FRCTony

If you figure 30hp per PSI, you should easily make your goal.

No way in hell the car is gonna be faster, as I'm sure it is already traction limited. I'd bet most couldn't tell the difference between 780 and 900 on a centri car anyway.

I would recommend throwing it on a dynojet, and have them "tweak" the numbers

marco383

The plan is (assuming that he still wants the car once he gets here; he's from elsewhere), it will go to my tuner/builder here in the Atlanta area to be upgraded. Since he'll be there, no fun and games with dyno numbers.

He understands that once the boost goes up, it's his car. Sometimes bad things happen on dynos.

robert miller

More like 20 to 25 per psi

For sure get the money for it befor it goes on the dyno. At 9.1 with all the parts that you have in it. and a good aftermaket set of springs in the heads. It will or should hold up too 20 psi with meth with no problems. turn it up.

AlwaysInBoost

this guy wouldn't happen to be from Kuwait... would he?

0Brian@FI Performance

My question is can the buyer handle that kind of power. I mean really, you shouldn't have one of these high hp machines if you can't drive right with all aids (AH/TC) turned off etc...

Brian

road pilot

I think I would like to see the money before I would start
your project. I prefer conservative tunes and low rwhp.
But if I were moving into the 1000 rwhp range I would
be looking for insurance and meth. would give me that.
This whole sale sounds screwy.
Good luck and I mean it.

madmatt9471

When I looked at this earlier in the day I could not answer due to time -

My thoughts were with 20-25 HP per PSI of Boost and you need a 120 RWHP to hit the 900 RWHP mark -

8 PSI now so you will need at least 5-6 PSI more, which'll put you relatively at 14 PSI of BOOST - this should get you there but remember heat will become a factor, and one wants to make sure there is enough fuel to feed it.

Methanol of course will keep it cooler in the cylinders and intake charge but that is MOOT at this point due to reasons unknown -

Right now there is no way for us to tell if you are tuned on the edge or not! // Duty Cycle as well as timing //- let's hope the tuner will be able to do a good "SAFE" job tuning -

I have 80lb Injectors and Methanol injection and my duty cycle is at 80% - so make sure you have enough injector to fuel it or BOOM!

I do believe there is a 90+lb Hi-Impedence injector that can be used but not sure right now!

Thanks,Matt

tommygunMCR

with a cam swap and more boost its possible till the blocks walls start to distort.

We made 845rwhp on a C5R block before we had issues.

marco383

My tuner is pretty sharp on all the issues mentioned. If the deal happens, the car will be paid for (wire transfer) before it leaves my garage for the tuner's shop.

As for handling the power, I have no idea about his skill/experience level. Up to a point, the traction control can save one's ***.

HIGHRPM

First of all I didn't say you needed 10 psi more...8 maybe 9...my AFR 205 heads were ported by TEA....they flow well over 345 @ .600..... and without meth your IATs will be higher and that will increase inefficiency....16 psi is a very realistic number to reach 900rwhp.