Papa Wells

Hey all! I have made a post like this before, but the setup has changed a ton since then. The car is finally coming together and I'm shooting for first start up to be around late spring or early summer 2017, just wanted to get some opinions. The car will be an 1/8th mile car that will see the street a decent amount, it will be on a mustang dyno and I'm curious what kind of track times and dyno numbers I may be able to expect.

Here's the set-up:
1998 Trans Am WS6
LQ9 408ci (~10.2:1 CR)
-15cc Wiseco pistons
Callies I-Beam rods
Callies DragonSlayer crankshaft
Cam Motion SRD 242/260 .629"/.620" 115.5+4.5 LSA
Holley Hi-Ram Intake & 102mm TB
TEA & BTR TrickFlow 235cc heads, 66cc chambers
1000cc Injectors
Nasty Performance Sumped Tank & MagnaFuel 4303 external pump
-10an feed & -8an return lines
F1-X ProCharger w/ 4.50 pulley & 7.65" Crank Pulley
(Spinning blower to 64,260 rpm impeller speed, 72k is max)
(Spinning engine to 7,000 rpms)
Aster Spring Tensioner Bracket
4.5" thick FMIC (Brute Speed kit)
3.5" hot side piping, 4" cold side piping (3.5" ProCharger side, 4" intake side)
2 Big Red Race BOV's
TSP 1 7/8" LT's
Kooks 3" True Duals
Rossler Terminator 5 Powerglide w/ Pro-Tree brake
PTC 9.5" 5000 stall converter
MWC 9" w/ Strange Pro Aluminum HD case, 3.70 gear
Strange Drag Brakes
Holley Dominator EFI
RaceWire solutions relay board & switch panels
Davis Technologies TC2 traction control box
MWC tubular K-Member, upper/lower A-Arms, manual rack/power steering delete, A/C delete, radio delete, weight reduction elsewhere.
MWC chromoly 8.50 cert cage
275 ET Street Pros
Shooting for 3000lb race weight or less
93 octane pump gas & pure M1 methanol (AlkyControl)

Thanks!

Bob@BruteSpeed

iTrader: (16)

The F-1X can make 1500+ hp when maxed out. I hope I'm wrong but I don't see the head gaskets hanging around for long. Bob

Papa Wells

Hmm, maybe I did the calculations wrong..I was under the impression that I'd be seeing 18-20psi with my setup?

Bob@BruteSpeed

iTrader: (16)

With an F-1X at max impeller speed? Are you sure it's not an F-1A? Bob

Papa Wells

It's most definitely an F1-X, I thought I may have done the impeller speed calculations wrong though. I may need to put on a bigger pulley and/or lower the engine rpm some, I was not wanting to max it out and say goodbye to this engine lol. Were my calculations correct? Would the 8.65/4.50 combo spinning to 7k be maxing it out?

Bob@BruteSpeed

iTrader: (16)

You were correct on your impeller speed.

To determine the impeller speed, the following formula is used:

Maximum impeller speed = crankshaft pulley diameter (N1) divided by supercharger pulley diameter (N2),multiplied by the step-up ratio (4.10 for the P-series/D series - 5.40 for the F series), multiplied by engine rpm at redline.

8.65 divided by 4.50 x 5.40 x 7000 = 72,660 rpm


Yeah, you're either going to want to go to a larger blower pulley or add a wastegate to it. Bob

Papa Wells

If I added a wastegate, would I be able to spin the engine to 7k and keep my current pulley setup? And where should I locate the wastegate, somewhat close to the ProCharger? I have two red race bov's, one that is pre-intercooler and one that is close to the intake.

Bob@BruteSpeed

iTrader: (16)

Yes you can indeed. Check out this article. http://www.superchevy.com/how-to/eng...ger-wastegate/

It mounts right there at the blower. Bob

Papa Wells

Very interesting read! Looks like I'll be going with a wastegate. Mount it as close to the blower as possible, correct? Thanks Bob! Assuming I'll be in the 18-20psi range, any guesses on ET or power?

Bob@BruteSpeed

iTrader: (16)

Yes, I would. 18 to 20 psi range is right where my '99 Camaro was with a 408, my blower cam, 9.5/1 compression, AFR 225 heads, Victor Jr and an F-1A with a 3.90 pulley and a 7.65 crank. My Camaro ran a 9.12 driving through the converter big time, the mph was only 146... My glide had to get rebuilt because it had shavings from the converter in it. It cut 1.29 60 ft times on dot 325/50R15's. If you work at it with your suspension, driving technique, etc I would expect 1/4 mile times to get into the 8.60 to 8.70 range with 18 to 20 psi of boost. With a wastegate you might drop into the 8.50's. With your 5000 stall you're not going to get a dyno trophy. It basically takes 1000 hp to get a 3500lb car to run a 9 flat. Bob

Papa Wells

Understandable, not as much worried about dyno numbers as track times. Since I'm new to wastegates and whatnot, what size would you recommend? I was looking at a 44mm or a 66mm but I have no clue if one or the other would be too big/small

Bob@BruteSpeed

iTrader: (16)

I'd say you're going to need a 66mm. Bob

Papa Wells

Awesome, I'll get one ordered. Thanks again for all the help Bob! I do have one more question, would the wastegate hook up similar to a bov? Would I run a vacuum fitting from the top of it to my vacuum block and then just have an 18-20psi spring in it?

Bob@BruteSpeed

iTrader: (16)

You're welcome. The installation instructions at this link show how a wastegate gets installed. http://www.precisionturbo.net/tech/i...structions.pdf Thanks. Bob

Martin Smallwood

iTrader: (2)

I've seen 1100+ with pump gas/meth set-ups using similar pulley combinations and plastic stock style intake manifolds. With single plane or tunnel ram style intakes and higher RPM's, 1200-1300rwhp+ isn't uncommon.

The 1500hp combinations you see with F1X's have 11.5:1+ compression, run Q16, air to water intercoolers, have solid roller camshafts much larger than yours, turn 7500-8500rpm+ and have single plane or tunnel ram style intakes on them.

If you can get the weight to 3000lbs. and it makes 1050-1100rwhp you'll easily be able to run 4.90's-5.0's with a 1.teen 60' and well into the 7.70-7.80 range if not faster. All depends on the 60' and 330' as you'll have the power to do it.

My old 76mm car made 1050rwhp and weighed close to 3300lbs. It went 5.12-5.15@137-138 like clockwork and would of gone faster before I sold it. If I could of sat at 3000lb race weight it would of been a very consistent 4.96-5.00 car.

Papa Wells

Sorry Martin, just saw this! That is exactly what I'd like the car to do..low 5's would be awesome, high 4's would be perfect. Hoping to get the car in the 3000lb range but we shall see.

I actually just messaged you on fb earlier today to make sure your cam will still do well with a Holley Hi-Ram because I am wanting to ditch my Fast 102 for the Holley.