Long time member, but been a long time since I was active. Black WS6 got stolen, so I replaced it by buying someone's project in need of resurrection. Previous owner built the 02 WS6 to be a high compression all-motor beast, then added a D1SC and Meth. The setup was all wrong for the blower, he didn't have forged internals, and was only able to run 4 or 5 pounds of boost, even with 100% meth. I got the car cheap, 7 and 8 pistons were trashed. I sent it back to the same guys that built it the first time for forged internals and run through the car. I got it back from them in October, did all the required break-in procedures and mileage, and had the final dyno tune done last week. 617 RWHP / 530 TQ. Peak HP was at 6700, 9 pounds of boost at almost 7K RPM. Honestly, i was hoping to see 700 HP. The tuner says I can get 700 with just a little more boost, but, to get more boost I will need to upgrade the fuel pump again. Injectors were only at 60% duty cycle on the dyno runs.

I don't have complete specific details on every part since this was bought, not built, but if someone wants to go through the upgrade list and tell me what I might consider changing, I'm interested. This is just a weekend toy for a 50 year old man. No hard launches. No drag radials or slicks. Still have the stock rear with 3.42 gear.

Stock LS1 block and crank (should be good to 1000 easy)
Fuel pump upgraded (no specs)
Trickflow 225cc 65cc heads, ported and milled
YellaTerra Roller Rockers
COPO Lifters
Dual Springs (no specs)
Callies forged rods (no specs)
Ross forged pistons (no specs)
Cam - 229/238 .615/.615 115 +3
FAST 102 intake
102 Throttle Body
LS2 fuel rails
80 lb injectors
D1SC SC, dual air/air intercoolers
100% meth injection, alky systems
McLeod RXT twin disc into stock T56
LT Headers, high flow cats, cutout before rear axle


I think that's the bulk of the power goodies. All the usual rest of the supporting hardware, ARP, Melling oil pump, etc. SD tune on 93 octane.

 

do you have any logs of the fuel pressure?

 

This is literally the only thing I got besides a dynograph of one pull, and the invoice.

 

I'm thinking it's time for a 450walbro or better and a full return style set up with boost reference type regulator and more injector . you got too feed that beast, and a starved fuel system just won't deliver the goods. In fact I recommend always building the fuel set up for much more than you need. It's better to have it and not need it than, need it and not have it..... Just my .02 worth happy wrenching sir..

 

Don't see an Aster Bracket belt tensioner or ATI belt tensioner on your wish list. Pretty sure you will need one or the other to go north of 10 lbs of boost to get to 700 rwhp.

With the stock ATI J bracket you will probably get some belt slip when pushing the D1 to get more boost (more head unit rpm)

IMO if an Aster Bracket or ATI new and improved J Bracket belt tensioner assembly isn't in your budget then I would suggest a larger crank pulley from 7.65 to 8.65. The larger crank pulley adds more belt wrap while at the same time allows one to downsize from the stock 4.5 head unit pulley to a smaller pulley but not quite as small if you were to keep the 7.65 pulley.

Pretty sure you will need a smaller head unit pulley. But smaller means less belt wrap - the smaller the pulley the less belt wrap. You want it as large as possible but still reach the desired boost level. The 8.65 crank pulley allows you to use a larger head unit pulley than the 7.65 crank pulley.

So with a larger crank pulley you gain belt wrap and also with a not so small head unit pulley.

Gates also has a new and improved blower belt which won't stretch, if any, compared to the Gates easily identified 'Green' belt.

As the blower belt heats, it expands and stretches. As a result you get belt slip. The Gates RPM product line, because of the materials in the belt, is said not to stretch. Nor do you have to adjust it as tightly compared to the 'Green' belt. Both of these features should improve belt life and perhaps even bearing life on the head unit.

Don't know if ATI contracts with Gates now and rebrands the RPM belt as their product. You might call and ask.

If you decide to on either of the above, IMO, Bob at Brute Speed is your best source for ATI products and technical advise.

IMO, if you choose to go the belt tensioner route, opt for the ATI tensioner J bracket assembly. Check with ATI or Bob, but I think it comes with an 8.00 crank pulley.

Other: "Trust" no longer posts - did get over 750 rwhp with twin 4.5 intercoolers but had overheating issues compounded by extremely hot summer ambient temps in Oklahoma (mid to high 90's).

 

Thanks for the info and feedback. The thing died on me yesterday, won't restart. So may be replacing the fuel pump anyway.

 

Well if anyone was playing along at home, the fuel pump died the first day I drove it. It's been replaced with a 340 and a hotwire kit. My tuner says 340 is as large as I can go with the stock fuel lines. With a little more fuel now, we also changed the pulley on the blower for just a little more boost, and and swapped over to the updated inlet on the D1SC. End result, 680 RWHP, 588 TQ. (in 100 degree Memphis heat) I'm gonna call it done. It's very mild and streetable. But the power is there if you want it.

 

what bracket are you running ?I use the aster bracket

 

I was able to reliably support 700whp on the stock returnless style fuel system with twin 255's on a hobbs switch incase you want a little more.
Get another hotwire kit and wire in the hobbs to come on at 5 lbs. and you'll be set.

 

Great info. I'll tuck that away if the need arises in the future.

 

Agreed. Ran 2x 255 lph walboro pumps for years at ~700 HP through the stock system. It works fine. I now run 2x 340 through the stock lines - still works fine, you just have to change to an aftermarket return regulator. There is a minor pinch-point at the pump discharge of the tank, but other than that the rest of the stock system is equivalent to a 6 AN supply system.

This setup is actually very close to where I ran for a very long time (18 years and 50k+ miles) without any issues. It is a nice, stable, place to park a D1SC.